X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Futil.c;fp=src%2Futil.c;h=0000000000000000000000000000000000000000;hb=d7832d2c6e0ef5f2839a2296c1cc2fc85c7d9632;hp=dfc1dc6b85a94a7dec0bf01cc2b74dfc08938c9f;hpb=304b9f30781b8625c1f84fd27205f2707d4843b1;p=elogind.git diff --git a/src/util.c b/src/util.c deleted file mode 100644 index dfc1dc6b8..000000000 --- a/src/util.c +++ /dev/null @@ -1,6256 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - This file is part of systemd. - - Copyright 2010 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with systemd; If not, see . -***/ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "macro.h" -#include "util.h" -#include "ioprio.h" -#include "missing.h" -#include "log.h" -#include "strv.h" -#include "label.h" -#include "exit-status.h" -#include "hashmap.h" - -int saved_argc = 0; -char **saved_argv = NULL; - -size_t page_size(void) { - static __thread size_t pgsz = 0; - long r; - - if (_likely_(pgsz > 0)) - return pgsz; - - assert_se((r = sysconf(_SC_PAGESIZE)) > 0); - - pgsz = (size_t) r; - - return pgsz; -} - -bool streq_ptr(const char *a, const char *b) { - - /* Like streq(), but tries to make sense of NULL pointers */ - - if (a && b) - return streq(a, b); - - if (!a && !b) - return true; - - return false; -} - -usec_t now(clockid_t clock_id) { - struct timespec ts; - - assert_se(clock_gettime(clock_id, &ts) == 0); - - return timespec_load(&ts); -} - -dual_timestamp* dual_timestamp_get(dual_timestamp *ts) { - assert(ts); - - ts->realtime = now(CLOCK_REALTIME); - ts->monotonic = now(CLOCK_MONOTONIC); - - return ts; -} - -dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) { - int64_t delta; - assert(ts); - - ts->realtime = u; - - if (u == 0) - ts->monotonic = 0; - else { - delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u; - - ts->monotonic = now(CLOCK_MONOTONIC); - - if ((int64_t) ts->monotonic > delta) - ts->monotonic -= delta; - else - ts->monotonic = 0; - } - - return ts; -} - -usec_t timespec_load(const struct timespec *ts) { - assert(ts); - - return - (usec_t) ts->tv_sec * USEC_PER_SEC + - (usec_t) ts->tv_nsec / NSEC_PER_USEC; -} - -struct timespec *timespec_store(struct timespec *ts, usec_t u) { - assert(ts); - - ts->tv_sec = (time_t) (u / USEC_PER_SEC); - ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC); - - return ts; -} - -usec_t timeval_load(const struct timeval *tv) { - assert(tv); - - return - (usec_t) tv->tv_sec * USEC_PER_SEC + - (usec_t) tv->tv_usec; -} - -struct timeval *timeval_store(struct timeval *tv, usec_t u) { - assert(tv); - - tv->tv_sec = (time_t) (u / USEC_PER_SEC); - tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC); - - return tv; -} - -bool endswith(const char *s, const char *postfix) { - size_t sl, pl; - - assert(s); - assert(postfix); - - sl = strlen(s); - pl = strlen(postfix); - - if (pl == 0) - return true; - - if (sl < pl) - return false; - - return memcmp(s + sl - pl, postfix, pl) == 0; -} - -bool startswith(const char *s, const char *prefix) { - size_t sl, pl; - - assert(s); - assert(prefix); - - sl = strlen(s); - pl = strlen(prefix); - - if (pl == 0) - return true; - - if (sl < pl) - return false; - - return memcmp(s, prefix, pl) == 0; -} - -bool startswith_no_case(const char *s, const char *prefix) { - size_t sl, pl; - unsigned i; - - assert(s); - assert(prefix); - - sl = strlen(s); - pl = strlen(prefix); - - if (pl == 0) - return true; - - if (sl < pl) - return false; - - for(i = 0; i < pl; ++i) { - if (tolower(s[i]) != tolower(prefix[i])) - return false; - } - - return true; -} - -bool first_word(const char *s, const char *word) { - size_t sl, wl; - - assert(s); - assert(word); - - sl = strlen(s); - wl = strlen(word); - - if (sl < wl) - return false; - - if (wl == 0) - return true; - - if (memcmp(s, word, wl) != 0) - return false; - - return s[wl] == 0 || - strchr(WHITESPACE, s[wl]); -} - -int close_nointr(int fd) { - assert(fd >= 0); - - for (;;) { - int r; - - r = close(fd); - if (r >= 0) - return r; - - if (errno != EINTR) - return -errno; - } -} - -void close_nointr_nofail(int fd) { - int saved_errno = errno; - - /* like close_nointr() but cannot fail, and guarantees errno - * is unchanged */ - - assert_se(close_nointr(fd) == 0); - - errno = saved_errno; -} - -void close_many(const int fds[], unsigned n_fd) { - unsigned i; - - for (i = 0; i < n_fd; i++) - close_nointr_nofail(fds[i]); -} - -int parse_boolean(const char *v) { - assert(v); - - if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on")) - return 1; - else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off")) - return 0; - - return -EINVAL; -} - -int parse_pid(const char *s, pid_t* ret_pid) { - unsigned long ul = 0; - pid_t pid; - int r; - - assert(s); - assert(ret_pid); - - if ((r = safe_atolu(s, &ul)) < 0) - return r; - - pid = (pid_t) ul; - - if ((unsigned long) pid != ul) - return -ERANGE; - - if (pid <= 0) - return -ERANGE; - - *ret_pid = pid; - return 0; -} - -int parse_uid(const char *s, uid_t* ret_uid) { - unsigned long ul = 0; - uid_t uid; - int r; - - assert(s); - assert(ret_uid); - - if ((r = safe_atolu(s, &ul)) < 0) - return r; - - uid = (uid_t) ul; - - if ((unsigned long) uid != ul) - return -ERANGE; - - *ret_uid = uid; - return 0; -} - -int safe_atou(const char *s, unsigned *ret_u) { - char *x = NULL; - unsigned long l; - - assert(s); - assert(ret_u); - - errno = 0; - l = strtoul(s, &x, 0); - - if (!x || *x || errno) - return errno ? -errno : -EINVAL; - - if ((unsigned long) (unsigned) l != l) - return -ERANGE; - - *ret_u = (unsigned) l; - return 0; -} - -int safe_atoi(const char *s, int *ret_i) { - char *x = NULL; - long l; - - assert(s); - assert(ret_i); - - errno = 0; - l = strtol(s, &x, 0); - - if (!x || *x || errno) - return errno ? -errno : -EINVAL; - - if ((long) (int) l != l) - return -ERANGE; - - *ret_i = (int) l; - return 0; -} - -int safe_atollu(const char *s, long long unsigned *ret_llu) { - char *x = NULL; - unsigned long long l; - - assert(s); - assert(ret_llu); - - errno = 0; - l = strtoull(s, &x, 0); - - if (!x || *x || errno) - return errno ? -errno : -EINVAL; - - *ret_llu = l; - return 0; -} - -int safe_atolli(const char *s, long long int *ret_lli) { - char *x = NULL; - long long l; - - assert(s); - assert(ret_lli); - - errno = 0; - l = strtoll(s, &x, 0); - - if (!x || *x || errno) - return errno ? -errno : -EINVAL; - - *ret_lli = l; - return 0; -} - -/* Split a string into words. */ -char *split(const char *c, size_t *l, const char *separator, char **state) { - char *current; - - current = *state ? *state : (char*) c; - - if (!*current || *c == 0) - return NULL; - - current += strspn(current, separator); - *l = strcspn(current, separator); - *state = current+*l; - - return (char*) current; -} - -/* Split a string into words, but consider strings enclosed in '' and - * "" as words even if they include spaces. */ -char *split_quoted(const char *c, size_t *l, char **state) { - char *current, *e; - bool escaped = false; - - current = *state ? *state : (char*) c; - - if (!*current || *c == 0) - return NULL; - - current += strspn(current, WHITESPACE); - - if (*current == '\'') { - current ++; - - for (e = current; *e; e++) { - if (escaped) - escaped = false; - else if (*e == '\\') - escaped = true; - else if (*e == '\'') - break; - } - - *l = e-current; - *state = *e == 0 ? e : e+1; - } else if (*current == '\"') { - current ++; - - for (e = current; *e; e++) { - if (escaped) - escaped = false; - else if (*e == '\\') - escaped = true; - else if (*e == '\"') - break; - } - - *l = e-current; - *state = *e == 0 ? e : e+1; - } else { - for (e = current; *e; e++) { - if (escaped) - escaped = false; - else if (*e == '\\') - escaped = true; - else if (strchr(WHITESPACE, *e)) - break; - } - *l = e-current; - *state = e; - } - - return (char*) current; -} - -char **split_path_and_make_absolute(const char *p) { - char **l; - assert(p); - - if (!(l = strv_split(p, ":"))) - return NULL; - - if (!strv_path_make_absolute_cwd(l)) { - strv_free(l); - return NULL; - } - - return l; -} - -int get_parent_of_pid(pid_t pid, pid_t *_ppid) { - int r; - FILE *f; - char fn[PATH_MAX], line[LINE_MAX], *p; - long unsigned ppid; - - assert(pid > 0); - assert(_ppid); - - assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1)); - char_array_0(fn); - - if (!(f = fopen(fn, "re"))) - return -errno; - - if (!(fgets(line, sizeof(line), f))) { - r = feof(f) ? -EIO : -errno; - fclose(f); - return r; - } - - fclose(f); - - /* Let's skip the pid and comm fields. The latter is enclosed - * in () but does not escape any () in its value, so let's - * skip over it manually */ - - if (!(p = strrchr(line, ')'))) - return -EIO; - - p++; - - if (sscanf(p, " " - "%*c " /* state */ - "%lu ", /* ppid */ - &ppid) != 1) - return -EIO; - - if ((long unsigned) (pid_t) ppid != ppid) - return -ERANGE; - - *_ppid = (pid_t) ppid; - - return 0; -} - -int get_starttime_of_pid(pid_t pid, unsigned long long *st) { - int r; - FILE *f; - char fn[PATH_MAX], line[LINE_MAX], *p; - - assert(pid > 0); - assert(st); - - assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1)); - char_array_0(fn); - - if (!(f = fopen(fn, "re"))) - return -errno; - - if (!(fgets(line, sizeof(line), f))) { - r = feof(f) ? -EIO : -errno; - fclose(f); - return r; - } - - fclose(f); - - /* Let's skip the pid and comm fields. The latter is enclosed - * in () but does not escape any () in its value, so let's - * skip over it manually */ - - if (!(p = strrchr(line, ')'))) - return -EIO; - - p++; - - if (sscanf(p, " " - "%*c " /* state */ - "%*d " /* ppid */ - "%*d " /* pgrp */ - "%*d " /* session */ - "%*d " /* tty_nr */ - "%*d " /* tpgid */ - "%*u " /* flags */ - "%*u " /* minflt */ - "%*u " /* cminflt */ - "%*u " /* majflt */ - "%*u " /* cmajflt */ - "%*u " /* utime */ - "%*u " /* stime */ - "%*d " /* cutime */ - "%*d " /* cstime */ - "%*d " /* priority */ - "%*d " /* nice */ - "%*d " /* num_threads */ - "%*d " /* itrealvalue */ - "%llu " /* starttime */, - st) != 1) - return -EIO; - - return 0; -} - -int write_one_line_file(const char *fn, const char *line) { - FILE *f; - int r; - - assert(fn); - assert(line); - - if (!(f = fopen(fn, "we"))) - return -errno; - - errno = 0; - if (fputs(line, f) < 0) { - r = -errno; - goto finish; - } - - if (!endswith(line, "\n")) - fputc('\n', f); - - fflush(f); - - if (ferror(f)) { - if (errno != 0) - r = -errno; - else - r = -EIO; - } else - r = 0; - -finish: - fclose(f); - return r; -} - -int fchmod_umask(int fd, mode_t m) { - mode_t u; - int r; - - u = umask(0777); - r = fchmod(fd, m & (~u)) < 0 ? -errno : 0; - umask(u); - - return r; -} - -int write_one_line_file_atomic(const char *fn, const char *line) { - FILE *f; - int r; - char *p; - - assert(fn); - assert(line); - - r = fopen_temporary(fn, &f, &p); - if (r < 0) - return r; - - fchmod_umask(fileno(f), 0644); - - errno = 0; - if (fputs(line, f) < 0) { - r = -errno; - goto finish; - } - - if (!endswith(line, "\n")) - fputc('\n', f); - - fflush(f); - - if (ferror(f)) { - if (errno != 0) - r = -errno; - else - r = -EIO; - } else { - if (rename(p, fn) < 0) - r = -errno; - else - r = 0; - } - -finish: - if (r < 0) - unlink(p); - - fclose(f); - free(p); - - return r; -} - -int read_one_line_file(const char *fn, char **line) { - FILE *f; - int r; - char t[LINE_MAX], *c; - - assert(fn); - assert(line); - - f = fopen(fn, "re"); - if (!f) - return -errno; - - if (!fgets(t, sizeof(t), f)) { - - if (ferror(f)) { - r = -errno; - goto finish; - } - - t[0] = 0; - } - - c = strdup(t); - if (!c) { - r = -ENOMEM; - goto finish; - } - - truncate_nl(c); - - *line = c; - r = 0; - -finish: - fclose(f); - return r; -} - -int read_full_file(const char *fn, char **contents, size_t *size) { - FILE *f; - int r; - size_t n, l; - char *buf = NULL; - struct stat st; - - if (!(f = fopen(fn, "re"))) - return -errno; - - if (fstat(fileno(f), &st) < 0) { - r = -errno; - goto finish; - } - - /* Safety check */ - if (st.st_size > 4*1024*1024) { - r = -E2BIG; - goto finish; - } - - n = st.st_size > 0 ? st.st_size : LINE_MAX; - l = 0; - - for (;;) { - char *t; - size_t k; - - if (!(t = realloc(buf, n+1))) { - r = -ENOMEM; - goto finish; - } - - buf = t; - k = fread(buf + l, 1, n - l, f); - - if (k <= 0) { - if (ferror(f)) { - r = -errno; - goto finish; - } - - break; - } - - l += k; - n *= 2; - - /* Safety check */ - if (n > 4*1024*1024) { - r = -E2BIG; - goto finish; - } - } - - buf[l] = 0; - *contents = buf; - buf = NULL; - - if (size) - *size = l; - - r = 0; - -finish: - fclose(f); - free(buf); - - return r; -} - -int parse_env_file( - const char *fname, - const char *separator, ...) { - - int r = 0; - char *contents = NULL, *p; - - assert(fname); - assert(separator); - - if ((r = read_full_file(fname, &contents, NULL)) < 0) - return r; - - p = contents; - for (;;) { - const char *key = NULL; - - p += strspn(p, separator); - p += strspn(p, WHITESPACE); - - if (!*p) - break; - - if (!strchr(COMMENTS, *p)) { - va_list ap; - char **value; - - va_start(ap, separator); - while ((key = va_arg(ap, char *))) { - size_t n; - char *v; - - value = va_arg(ap, char **); - - n = strlen(key); - if (strncmp(p, key, n) != 0 || - p[n] != '=') - continue; - - p += n + 1; - n = strcspn(p, separator); - - if (n >= 2 && - strchr(QUOTES, p[0]) && - p[n-1] == p[0]) - v = strndup(p+1, n-2); - else - v = strndup(p, n); - - if (!v) { - r = -ENOMEM; - va_end(ap); - goto fail; - } - - if (v[0] == '\0') { - /* return empty value strings as NULL */ - free(v); - v = NULL; - } - - free(*value); - *value = v; - - p += n; - - r ++; - break; - } - va_end(ap); - } - - if (!key) - p += strcspn(p, separator); - } - -fail: - free(contents); - return r; -} - -int load_env_file( - const char *fname, - char ***rl) { - - FILE *f; - char **m = NULL; - int r; - - assert(fname); - assert(rl); - - if (!(f = fopen(fname, "re"))) - return -errno; - - while (!feof(f)) { - char l[LINE_MAX], *p, *u; - char **t; - - if (!fgets(l, sizeof(l), f)) { - if (feof(f)) - break; - - r = -errno; - goto finish; - } - - p = strstrip(l); - - if (!*p) - continue; - - if (strchr(COMMENTS, *p)) - continue; - - if (!(u = normalize_env_assignment(p))) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } - - t = strv_append(m, u); - free(u); - - if (!t) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } - - strv_free(m); - m = t; - } - - r = 0; - - *rl = m; - m = NULL; - -finish: - if (f) - fclose(f); - - strv_free(m); - - return r; -} - -int write_env_file(const char *fname, char **l) { - char **i, *p; - FILE *f; - int r; - - r = fopen_temporary(fname, &f, &p); - if (r < 0) - return r; - - fchmod_umask(fileno(f), 0644); - - errno = 0; - STRV_FOREACH(i, l) { - fputs(*i, f); - fputc('\n', f); - } - - fflush(f); - - if (ferror(f)) { - if (errno != 0) - r = -errno; - else - r = -EIO; - } else { - if (rename(p, fname) < 0) - r = -errno; - else - r = 0; - } - - if (r < 0) - unlink(p); - - fclose(f); - free(p); - - return r; -} - -char *truncate_nl(char *s) { - assert(s); - - s[strcspn(s, NEWLINE)] = 0; - return s; -} - -int get_process_comm(pid_t pid, char **name) { - int r; - - assert(name); - - if (pid == 0) - r = read_one_line_file("/proc/self/comm", name); - else { - char *p; - if (asprintf(&p, "/proc/%lu/comm", (unsigned long) pid) < 0) - return -ENOMEM; - - r = read_one_line_file(p, name); - free(p); - } - - return r; -} - -int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) { - char *r, *k; - int c; - bool space = false; - size_t left; - FILE *f; - - assert(max_length > 0); - assert(line); - - if (pid == 0) - f = fopen("/proc/self/cmdline", "re"); - else { - char *p; - if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0) - return -ENOMEM; - - f = fopen(p, "re"); - free(p); - } - - if (!f) - return -errno; - - r = new(char, max_length); - if (!r) { - fclose(f); - return -ENOMEM; - } - - k = r; - left = max_length; - while ((c = getc(f)) != EOF) { - - if (isprint(c)) { - if (space) { - if (left <= 4) - break; - - *(k++) = ' '; - left--; - space = false; - } - - if (left <= 4) - break; - - *(k++) = (char) c; - left--; - } else - space = true; - } - - if (left <= 4) { - size_t n = MIN(left-1, 3U); - memcpy(k, "...", n); - k[n] = 0; - } else - *k = 0; - - fclose(f); - - /* Kernel threads have no argv[] */ - if (r[0] == 0) { - char *t; - int h; - - free(r); - - if (!comm_fallback) - return -ENOENT; - - h = get_process_comm(pid, &t); - if (h < 0) - return h; - - r = join("[", t, "]", NULL); - free(t); - - if (!r) - return -ENOMEM; - } - - *line = r; - return 0; -} - -int is_kernel_thread(pid_t pid) { - char *p; - size_t count; - char c; - bool eof; - FILE *f; - - if (pid == 0) - return 0; - - if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0) - return -ENOMEM; - - f = fopen(p, "re"); - free(p); - - if (!f) - return -errno; - - count = fread(&c, 1, 1, f); - eof = feof(f); - fclose(f); - - /* Kernel threads have an empty cmdline */ - - if (count <= 0) - return eof ? 1 : -errno; - - return 0; -} - -int get_process_exe(pid_t pid, char **name) { - int r; - - assert(name); - - if (pid == 0) - r = readlink_malloc("/proc/self/exe", name); - else { - char *p; - if (asprintf(&p, "/proc/%lu/exe", (unsigned long) pid) < 0) - return -ENOMEM; - - r = readlink_malloc(p, name); - free(p); - } - - return r; -} - -int get_process_uid(pid_t pid, uid_t *uid) { - char *p; - FILE *f; - int r; - - assert(uid); - - if (pid == 0) - return getuid(); - - if (asprintf(&p, "/proc/%lu/status", (unsigned long) pid) < 0) - return -ENOMEM; - - f = fopen(p, "re"); - free(p); - - if (!f) - return -errno; - - while (!feof(f)) { - char line[LINE_MAX], *l; - - if (!fgets(line, sizeof(line), f)) { - if (feof(f)) - break; - - r = -errno; - goto finish; - } - - l = strstrip(line); - - if (startswith(l, "Uid:")) { - l += 4; - l += strspn(l, WHITESPACE); - - l[strcspn(l, WHITESPACE)] = 0; - - r = parse_uid(l, uid); - goto finish; - } - } - - r = -EIO; - -finish: - fclose(f); - - return r; -} - -char *strnappend(const char *s, const char *suffix, size_t b) { - size_t a; - char *r; - - if (!s && !suffix) - return strdup(""); - - if (!s) - return strndup(suffix, b); - - if (!suffix) - return strdup(s); - - assert(s); - assert(suffix); - - a = strlen(s); - - if (!(r = new(char, a+b+1))) - return NULL; - - memcpy(r, s, a); - memcpy(r+a, suffix, b); - r[a+b] = 0; - - return r; -} - -char *strappend(const char *s, const char *suffix) { - return strnappend(s, suffix, suffix ? strlen(suffix) : 0); -} - -int readlink_malloc(const char *p, char **r) { - size_t l = 100; - - assert(p); - assert(r); - - for (;;) { - char *c; - ssize_t n; - - if (!(c = new(char, l))) - return -ENOMEM; - - if ((n = readlink(p, c, l-1)) < 0) { - int ret = -errno; - free(c); - return ret; - } - - if ((size_t) n < l-1) { - c[n] = 0; - *r = c; - return 0; - } - - free(c); - l *= 2; - } -} - -int readlink_and_make_absolute(const char *p, char **r) { - char *target, *k; - int j; - - assert(p); - assert(r); - - if ((j = readlink_malloc(p, &target)) < 0) - return j; - - k = file_in_same_dir(p, target); - free(target); - - if (!k) - return -ENOMEM; - - *r = k; - return 0; -} - -int readlink_and_canonicalize(const char *p, char **r) { - char *t, *s; - int j; - - assert(p); - assert(r); - - j = readlink_and_make_absolute(p, &t); - if (j < 0) - return j; - - s = canonicalize_file_name(t); - if (s) { - free(t); - *r = s; - } else - *r = t; - - path_kill_slashes(*r); - - return 0; -} - -int parent_of_path(const char *path, char **_r) { - const char *e, *a = NULL, *b = NULL, *p; - char *r; - bool slash = false; - - assert(path); - assert(_r); - - if (!*path) - return -EINVAL; - - for (e = path; *e; e++) { - - if (!slash && *e == '/') { - a = b; - b = e; - slash = true; - } else if (slash && *e != '/') - slash = false; - } - - if (*(e-1) == '/') - p = a; - else - p = b; - - if (!p) - return -EINVAL; - - if (p == path) - r = strdup("/"); - else - r = strndup(path, p-path); - - if (!r) - return -ENOMEM; - - *_r = r; - return 0; -} - - -char *file_name_from_path(const char *p) { - char *r; - - assert(p); - - if ((r = strrchr(p, '/'))) - return r + 1; - - return (char*) p; -} - -bool path_is_absolute(const char *p) { - assert(p); - - return p[0] == '/'; -} - -bool is_path(const char *p) { - - return !!strchr(p, '/'); -} - -char *path_make_absolute(const char *p, const char *prefix) { - assert(p); - - /* Makes every item in the list an absolute path by prepending - * the prefix, if specified and necessary */ - - if (path_is_absolute(p) || !prefix) - return strdup(p); - - return join(prefix, "/", p, NULL); -} - -char *path_make_absolute_cwd(const char *p) { - char *cwd, *r; - - assert(p); - - /* Similar to path_make_absolute(), but prefixes with the - * current working directory. */ - - if (path_is_absolute(p)) - return strdup(p); - - if (!(cwd = get_current_dir_name())) - return NULL; - - r = path_make_absolute(p, cwd); - free(cwd); - - return r; -} - -char **strv_path_make_absolute_cwd(char **l) { - char **s; - - /* Goes through every item in the string list and makes it - * absolute. This works in place and won't rollback any - * changes on failure. */ - - STRV_FOREACH(s, l) { - char *t; - - if (!(t = path_make_absolute_cwd(*s))) - return NULL; - - free(*s); - *s = t; - } - - return l; -} - -char **strv_path_canonicalize(char **l) { - char **s; - unsigned k = 0; - bool enomem = false; - - if (strv_isempty(l)) - return l; - - /* Goes through every item in the string list and canonicalize - * the path. This works in place and won't rollback any - * changes on failure. */ - - STRV_FOREACH(s, l) { - char *t, *u; - - t = path_make_absolute_cwd(*s); - free(*s); - - if (!t) { - enomem = true; - continue; - } - - errno = 0; - u = canonicalize_file_name(t); - free(t); - - if (!u) { - if (errno == ENOMEM || !errno) - enomem = true; - - continue; - } - - l[k++] = u; - } - - l[k] = NULL; - - if (enomem) - return NULL; - - return l; -} - -char **strv_path_remove_empty(char **l) { - char **f, **t; - - if (!l) - return NULL; - - for (f = t = l; *f; f++) { - - if (dir_is_empty(*f) > 0) { - free(*f); - continue; - } - - *(t++) = *f; - } - - *t = NULL; - return l; -} - -int reset_all_signal_handlers(void) { - int sig; - - for (sig = 1; sig < _NSIG; sig++) { - struct sigaction sa; - - if (sig == SIGKILL || sig == SIGSTOP) - continue; - - zero(sa); - sa.sa_handler = SIG_DFL; - sa.sa_flags = SA_RESTART; - - /* On Linux the first two RT signals are reserved by - * glibc, and sigaction() will return EINVAL for them. */ - if ((sigaction(sig, &sa, NULL) < 0)) - if (errno != EINVAL) - return -errno; - } - - return 0; -} - -char *strstrip(char *s) { - char *e; - - /* Drops trailing whitespace. Modifies the string in - * place. Returns pointer to first non-space character */ - - s += strspn(s, WHITESPACE); - - for (e = strchr(s, 0); e > s; e --) - if (!strchr(WHITESPACE, e[-1])) - break; - - *e = 0; - - return s; -} - -char *delete_chars(char *s, const char *bad) { - char *f, *t; - - /* Drops all whitespace, regardless where in the string */ - - for (f = s, t = s; *f; f++) { - if (strchr(bad, *f)) - continue; - - *(t++) = *f; - } - - *t = 0; - - return s; -} - -bool in_charset(const char *s, const char* charset) { - const char *i; - - assert(s); - assert(charset); - - for (i = s; *i; i++) - if (!strchr(charset, *i)) - return false; - - return true; -} - -char *file_in_same_dir(const char *path, const char *filename) { - char *e, *r; - size_t k; - - assert(path); - assert(filename); - - /* This removes the last component of path and appends - * filename, unless the latter is absolute anyway or the - * former isn't */ - - if (path_is_absolute(filename)) - return strdup(filename); - - if (!(e = strrchr(path, '/'))) - return strdup(filename); - - k = strlen(filename); - if (!(r = new(char, e-path+1+k+1))) - return NULL; - - memcpy(r, path, e-path+1); - memcpy(r+(e-path)+1, filename, k+1); - - return r; -} - -int safe_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) { - struct stat st; - - if (label_mkdir(path, mode) >= 0) - if (chmod_and_chown(path, mode, uid, gid) < 0) - return -errno; - - if (lstat(path, &st) < 0) - return -errno; - - if ((st.st_mode & 0777) != mode || - st.st_uid != uid || - st.st_gid != gid || - !S_ISDIR(st.st_mode)) { - errno = EEXIST; - return -errno; - } - - return 0; -} - - -int mkdir_parents(const char *path, mode_t mode) { - const char *p, *e; - - assert(path); - - /* Creates every parent directory in the path except the last - * component. */ - - p = path + strspn(path, "/"); - for (;;) { - int r; - char *t; - - e = p + strcspn(p, "/"); - p = e + strspn(e, "/"); - - /* Is this the last component? If so, then we're - * done */ - if (*p == 0) - return 0; - - if (!(t = strndup(path, e - path))) - return -ENOMEM; - - r = label_mkdir(t, mode); - free(t); - - if (r < 0 && errno != EEXIST) - return -errno; - } -} - -int mkdir_p(const char *path, mode_t mode) { - int r; - - /* Like mkdir -p */ - - if ((r = mkdir_parents(path, mode)) < 0) - return r; - - if (label_mkdir(path, mode) < 0 && errno != EEXIST) - return -errno; - - return 0; -} - -int rmdir_parents(const char *path, const char *stop) { - size_t l; - int r = 0; - - assert(path); - assert(stop); - - l = strlen(path); - - /* Skip trailing slashes */ - while (l > 0 && path[l-1] == '/') - l--; - - while (l > 0) { - char *t; - - /* Skip last component */ - while (l > 0 && path[l-1] != '/') - l--; - - /* Skip trailing slashes */ - while (l > 0 && path[l-1] == '/') - l--; - - if (l <= 0) - break; - - if (!(t = strndup(path, l))) - return -ENOMEM; - - if (path_startswith(stop, t)) { - free(t); - return 0; - } - - r = rmdir(t); - free(t); - - if (r < 0) - if (errno != ENOENT) - return -errno; - } - - return 0; -} - - -char hexchar(int x) { - static const char table[16] = "0123456789abcdef"; - - return table[x & 15]; -} - -int unhexchar(char c) { - - if (c >= '0' && c <= '9') - return c - '0'; - - if (c >= 'a' && c <= 'f') - return c - 'a' + 10; - - if (c >= 'A' && c <= 'F') - return c - 'A' + 10; - - return -1; -} - -char octchar(int x) { - return '0' + (x & 7); -} - -int unoctchar(char c) { - - if (c >= '0' && c <= '7') - return c - '0'; - - return -1; -} - -char decchar(int x) { - return '0' + (x % 10); -} - -int undecchar(char c) { - - if (c >= '0' && c <= '9') - return c - '0'; - - return -1; -} - -char *cescape(const char *s) { - char *r, *t; - const char *f; - - assert(s); - - /* Does C style string escaping. */ - - if (!(r = new(char, strlen(s)*4 + 1))) - return NULL; - - for (f = s, t = r; *f; f++) - - switch (*f) { - - case '\a': - *(t++) = '\\'; - *(t++) = 'a'; - break; - case '\b': - *(t++) = '\\'; - *(t++) = 'b'; - break; - case '\f': - *(t++) = '\\'; - *(t++) = 'f'; - break; - case '\n': - *(t++) = '\\'; - *(t++) = 'n'; - break; - case '\r': - *(t++) = '\\'; - *(t++) = 'r'; - break; - case '\t': - *(t++) = '\\'; - *(t++) = 't'; - break; - case '\v': - *(t++) = '\\'; - *(t++) = 'v'; - break; - case '\\': - *(t++) = '\\'; - *(t++) = '\\'; - break; - case '"': - *(t++) = '\\'; - *(t++) = '"'; - break; - case '\'': - *(t++) = '\\'; - *(t++) = '\''; - break; - - default: - /* For special chars we prefer octal over - * hexadecimal encoding, simply because glib's - * g_strescape() does the same */ - if ((*f < ' ') || (*f >= 127)) { - *(t++) = '\\'; - *(t++) = octchar((unsigned char) *f >> 6); - *(t++) = octchar((unsigned char) *f >> 3); - *(t++) = octchar((unsigned char) *f); - } else - *(t++) = *f; - break; - } - - *t = 0; - - return r; -} - -char *cunescape_length(const char *s, size_t length) { - char *r, *t; - const char *f; - - assert(s); - - /* Undoes C style string escaping */ - - r = new(char, length+1); - if (!r) - return r; - - for (f = s, t = r; f < s + length; f++) { - - if (*f != '\\') { - *(t++) = *f; - continue; - } - - f++; - - switch (*f) { - - case 'a': - *(t++) = '\a'; - break; - case 'b': - *(t++) = '\b'; - break; - case 'f': - *(t++) = '\f'; - break; - case 'n': - *(t++) = '\n'; - break; - case 'r': - *(t++) = '\r'; - break; - case 't': - *(t++) = '\t'; - break; - case 'v': - *(t++) = '\v'; - break; - case '\\': - *(t++) = '\\'; - break; - case '"': - *(t++) = '"'; - break; - case '\'': - *(t++) = '\''; - break; - - case 's': - /* This is an extension of the XDG syntax files */ - *(t++) = ' '; - break; - - case 'x': { - /* hexadecimal encoding */ - int a, b; - - a = unhexchar(f[1]); - b = unhexchar(f[2]); - - if (a < 0 || b < 0) { - /* Invalid escape code, let's take it literal then */ - *(t++) = '\\'; - *(t++) = 'x'; - } else { - *(t++) = (char) ((a << 4) | b); - f += 2; - } - - break; - } - - case '0': - case '1': - case '2': - case '3': - case '4': - case '5': - case '6': - case '7': { - /* octal encoding */ - int a, b, c; - - a = unoctchar(f[0]); - b = unoctchar(f[1]); - c = unoctchar(f[2]); - - if (a < 0 || b < 0 || c < 0) { - /* Invalid escape code, let's take it literal then */ - *(t++) = '\\'; - *(t++) = f[0]; - } else { - *(t++) = (char) ((a << 6) | (b << 3) | c); - f += 2; - } - - break; - } - - case 0: - /* premature end of string.*/ - *(t++) = '\\'; - goto finish; - - default: - /* Invalid escape code, let's take it literal then */ - *(t++) = '\\'; - *(t++) = *f; - break; - } - } - -finish: - *t = 0; - return r; -} - -char *cunescape(const char *s) { - return cunescape_length(s, strlen(s)); -} - -char *xescape(const char *s, const char *bad) { - char *r, *t; - const char *f; - - /* Escapes all chars in bad, in addition to \ and all special - * chars, in \xFF style escaping. May be reversed with - * cunescape. */ - - if (!(r = new(char, strlen(s)*4+1))) - return NULL; - - for (f = s, t = r; *f; f++) { - - if ((*f < ' ') || (*f >= 127) || - (*f == '\\') || strchr(bad, *f)) { - *(t++) = '\\'; - *(t++) = 'x'; - *(t++) = hexchar(*f >> 4); - *(t++) = hexchar(*f); - } else - *(t++) = *f; - } - - *t = 0; - - return r; -} - -char *bus_path_escape(const char *s) { - char *r, *t; - const char *f; - - assert(s); - - /* Escapes all chars that D-Bus' object path cannot deal - * with. Can be reverse with bus_path_unescape() */ - - if (!(r = new(char, strlen(s)*3+1))) - return NULL; - - for (f = s, t = r; *f; f++) { - - if (!(*f >= 'A' && *f <= 'Z') && - !(*f >= 'a' && *f <= 'z') && - !(*f >= '0' && *f <= '9')) { - *(t++) = '_'; - *(t++) = hexchar(*f >> 4); - *(t++) = hexchar(*f); - } else - *(t++) = *f; - } - - *t = 0; - - return r; -} - -char *bus_path_unescape(const char *f) { - char *r, *t; - - assert(f); - - if (!(r = strdup(f))) - return NULL; - - for (t = r; *f; f++) { - - if (*f == '_') { - int a, b; - - if ((a = unhexchar(f[1])) < 0 || - (b = unhexchar(f[2])) < 0) { - /* Invalid escape code, let's take it literal then */ - *(t++) = '_'; - } else { - *(t++) = (char) ((a << 4) | b); - f += 2; - } - } else - *(t++) = *f; - } - - *t = 0; - - return r; -} - -char *path_kill_slashes(char *path) { - char *f, *t; - bool slash = false; - - /* Removes redundant inner and trailing slashes. Modifies the - * passed string in-place. - * - * ///foo///bar/ becomes /foo/bar - */ - - for (f = path, t = path; *f; f++) { - - if (*f == '/') { - slash = true; - continue; - } - - if (slash) { - slash = false; - *(t++) = '/'; - } - - *(t++) = *f; - } - - /* Special rule, if we are talking of the root directory, a - trailing slash is good */ - - if (t == path && slash) - *(t++) = '/'; - - *t = 0; - return path; -} - -bool path_startswith(const char *path, const char *prefix) { - assert(path); - assert(prefix); - - if ((path[0] == '/') != (prefix[0] == '/')) - return false; - - for (;;) { - size_t a, b; - - path += strspn(path, "/"); - prefix += strspn(prefix, "/"); - - if (*prefix == 0) - return true; - - if (*path == 0) - return false; - - a = strcspn(path, "/"); - b = strcspn(prefix, "/"); - - if (a != b) - return false; - - if (memcmp(path, prefix, a) != 0) - return false; - - path += a; - prefix += b; - } -} - -bool path_equal(const char *a, const char *b) { - assert(a); - assert(b); - - if ((a[0] == '/') != (b[0] == '/')) - return false; - - for (;;) { - size_t j, k; - - a += strspn(a, "/"); - b += strspn(b, "/"); - - if (*a == 0 && *b == 0) - return true; - - if (*a == 0 || *b == 0) - return false; - - j = strcspn(a, "/"); - k = strcspn(b, "/"); - - if (j != k) - return false; - - if (memcmp(a, b, j) != 0) - return false; - - a += j; - b += k; - } -} - -char *ascii_strlower(char *t) { - char *p; - - assert(t); - - for (p = t; *p; p++) - if (*p >= 'A' && *p <= 'Z') - *p = *p - 'A' + 'a'; - - return t; -} - -bool ignore_file(const char *filename) { - assert(filename); - - return - filename[0] == '.' || - streq(filename, "lost+found") || - streq(filename, "aquota.user") || - streq(filename, "aquota.group") || - endswith(filename, "~") || - endswith(filename, ".rpmnew") || - endswith(filename, ".rpmsave") || - endswith(filename, ".rpmorig") || - endswith(filename, ".dpkg-old") || - endswith(filename, ".dpkg-new") || - endswith(filename, ".swp"); -} - -int fd_nonblock(int fd, bool nonblock) { - int flags; - - assert(fd >= 0); - - if ((flags = fcntl(fd, F_GETFL, 0)) < 0) - return -errno; - - if (nonblock) - flags |= O_NONBLOCK; - else - flags &= ~O_NONBLOCK; - - if (fcntl(fd, F_SETFL, flags) < 0) - return -errno; - - return 0; -} - -int fd_cloexec(int fd, bool cloexec) { - int flags; - - assert(fd >= 0); - - if ((flags = fcntl(fd, F_GETFD, 0)) < 0) - return -errno; - - if (cloexec) - flags |= FD_CLOEXEC; - else - flags &= ~FD_CLOEXEC; - - if (fcntl(fd, F_SETFD, flags) < 0) - return -errno; - - return 0; -} - -static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) { - unsigned i; - - assert(n_fdset == 0 || fdset); - - for (i = 0; i < n_fdset; i++) - if (fdset[i] == fd) - return true; - - return false; -} - -int close_all_fds(const int except[], unsigned n_except) { - DIR *d; - struct dirent *de; - int r = 0; - - assert(n_except == 0 || except); - - d = opendir("/proc/self/fd"); - if (!d) { - int fd; - struct rlimit rl; - - /* When /proc isn't available (for example in chroots) - * the fallback is brute forcing through the fd - * table */ - - assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0); - for (fd = 3; fd < (int) rl.rlim_max; fd ++) { - - if (fd_in_set(fd, except, n_except)) - continue; - - if (close_nointr(fd) < 0) - if (errno != EBADF && r == 0) - r = -errno; - } - - return r; - } - - while ((de = readdir(d))) { - int fd = -1; - - if (ignore_file(de->d_name)) - continue; - - if (safe_atoi(de->d_name, &fd) < 0) - /* Let's better ignore this, just in case */ - continue; - - if (fd < 3) - continue; - - if (fd == dirfd(d)) - continue; - - if (fd_in_set(fd, except, n_except)) - continue; - - if (close_nointr(fd) < 0) { - /* Valgrind has its own FD and doesn't want to have it closed */ - if (errno != EBADF && r == 0) - r = -errno; - } - } - - closedir(d); - return r; -} - -bool chars_intersect(const char *a, const char *b) { - const char *p; - - /* Returns true if any of the chars in a are in b. */ - for (p = a; *p; p++) - if (strchr(b, *p)) - return true; - - return false; -} - -char *format_timestamp(char *buf, size_t l, usec_t t) { - struct tm tm; - time_t sec; - - assert(buf); - assert(l > 0); - - if (t <= 0) - return NULL; - - sec = (time_t) (t / USEC_PER_SEC); - - if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0) - return NULL; - - return buf; -} - -char *format_timestamp_pretty(char *buf, size_t l, usec_t t) { - usec_t n, d; - - n = now(CLOCK_REALTIME); - - if (t <= 0 || t > n || t + USEC_PER_DAY*7 <= t) - return NULL; - - d = n - t; - - if (d >= USEC_PER_YEAR) - snprintf(buf, l, "%llu years and %llu months ago", - (unsigned long long) (d / USEC_PER_YEAR), - (unsigned long long) ((d % USEC_PER_YEAR) / USEC_PER_MONTH)); - else if (d >= USEC_PER_MONTH) - snprintf(buf, l, "%llu months and %llu days ago", - (unsigned long long) (d / USEC_PER_MONTH), - (unsigned long long) ((d % USEC_PER_MONTH) / USEC_PER_DAY)); - else if (d >= USEC_PER_WEEK) - snprintf(buf, l, "%llu weeks and %llu days ago", - (unsigned long long) (d / USEC_PER_WEEK), - (unsigned long long) ((d % USEC_PER_WEEK) / USEC_PER_DAY)); - else if (d >= 2*USEC_PER_DAY) - snprintf(buf, l, "%llu days ago", (unsigned long long) (d / USEC_PER_DAY)); - else if (d >= 25*USEC_PER_HOUR) - snprintf(buf, l, "1 day and %lluh ago", - (unsigned long long) ((d - USEC_PER_DAY) / USEC_PER_HOUR)); - else if (d >= 6*USEC_PER_HOUR) - snprintf(buf, l, "%lluh ago", - (unsigned long long) (d / USEC_PER_HOUR)); - else if (d >= USEC_PER_HOUR) - snprintf(buf, l, "%lluh %llumin ago", - (unsigned long long) (d / USEC_PER_HOUR), - (unsigned long long) ((d % USEC_PER_HOUR) / USEC_PER_MINUTE)); - else if (d >= 5*USEC_PER_MINUTE) - snprintf(buf, l, "%llumin ago", - (unsigned long long) (d / USEC_PER_MINUTE)); - else if (d >= USEC_PER_MINUTE) - snprintf(buf, l, "%llumin %llus ago", - (unsigned long long) (d / USEC_PER_MINUTE), - (unsigned long long) ((d % USEC_PER_MINUTE) / USEC_PER_SEC)); - else if (d >= USEC_PER_SEC) - snprintf(buf, l, "%llus ago", - (unsigned long long) (d / USEC_PER_SEC)); - else if (d >= USEC_PER_MSEC) - snprintf(buf, l, "%llums ago", - (unsigned long long) (d / USEC_PER_MSEC)); - else if (d > 0) - snprintf(buf, l, "%lluus ago", - (unsigned long long) d); - else - snprintf(buf, l, "now"); - - buf[l-1] = 0; - return buf; -} - -char *format_timespan(char *buf, size_t l, usec_t t) { - static const struct { - const char *suffix; - usec_t usec; - } table[] = { - { "w", USEC_PER_WEEK }, - { "d", USEC_PER_DAY }, - { "h", USEC_PER_HOUR }, - { "min", USEC_PER_MINUTE }, - { "s", USEC_PER_SEC }, - { "ms", USEC_PER_MSEC }, - { "us", 1 }, - }; - - unsigned i; - char *p = buf; - - assert(buf); - assert(l > 0); - - if (t == (usec_t) -1) - return NULL; - - if (t == 0) { - snprintf(p, l, "0"); - p[l-1] = 0; - return p; - } - - /* The result of this function can be parsed with parse_usec */ - - for (i = 0; i < ELEMENTSOF(table); i++) { - int k; - size_t n; - - if (t < table[i].usec) - continue; - - if (l <= 1) - break; - - k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix); - n = MIN((size_t) k, l); - - l -= n; - p += n; - - t %= table[i].usec; - } - - *p = 0; - - return buf; -} - -bool fstype_is_network(const char *fstype) { - static const char * const table[] = { - "cifs", - "smbfs", - "ncpfs", - "nfs", - "nfs4", - "gfs", - "gfs2" - }; - - unsigned i; - - for (i = 0; i < ELEMENTSOF(table); i++) - if (streq(table[i], fstype)) - return true; - - return false; -} - -int chvt(int vt) { - int fd, r = 0; - - if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0) - return -errno; - - if (vt < 0) { - int tiocl[2] = { - TIOCL_GETKMSGREDIRECT, - 0 - }; - - if (ioctl(fd, TIOCLINUX, tiocl) < 0) { - r = -errno; - goto fail; - } - - vt = tiocl[0] <= 0 ? 1 : tiocl[0]; - } - - if (ioctl(fd, VT_ACTIVATE, vt) < 0) - r = -errno; - -fail: - close_nointr_nofail(fd); - return r; -} - -int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { - struct termios old_termios, new_termios; - char c; - char line[LINE_MAX]; - - assert(f); - assert(ret); - - if (tcgetattr(fileno(f), &old_termios) >= 0) { - new_termios = old_termios; - - new_termios.c_lflag &= ~ICANON; - new_termios.c_cc[VMIN] = 1; - new_termios.c_cc[VTIME] = 0; - - if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { - size_t k; - - if (t != (usec_t) -1) { - if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { - tcsetattr(fileno(f), TCSADRAIN, &old_termios); - return -ETIMEDOUT; - } - } - - k = fread(&c, 1, 1, f); - - tcsetattr(fileno(f), TCSADRAIN, &old_termios); - - if (k <= 0) - return -EIO; - - if (need_nl) - *need_nl = c != '\n'; - - *ret = c; - return 0; - } - } - - if (t != (usec_t) -1) - if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) - return -ETIMEDOUT; - - if (!fgets(line, sizeof(line), f)) - return -EIO; - - truncate_nl(line); - - if (strlen(line) != 1) - return -EBADMSG; - - if (need_nl) - *need_nl = false; - - *ret = line[0]; - return 0; -} - -int ask(char *ret, const char *replies, const char *text, ...) { - bool on_tty; - - assert(ret); - assert(replies); - assert(text); - - on_tty = isatty(STDOUT_FILENO); - - for (;;) { - va_list ap; - char c; - int r; - bool need_nl = true; - - if (on_tty) - fputs(ANSI_HIGHLIGHT_ON, stdout); - - va_start(ap, text); - vprintf(text, ap); - va_end(ap); - - if (on_tty) - fputs(ANSI_HIGHLIGHT_OFF, stdout); - - fflush(stdout); - - r = read_one_char(stdin, &c, (usec_t) -1, &need_nl); - if (r < 0) { - - if (r == -EBADMSG) { - puts("Bad input, please try again."); - continue; - } - - putchar('\n'); - return r; - } - - if (need_nl) - putchar('\n'); - - if (strchr(replies, c)) { - *ret = c; - return 0; - } - - puts("Read unexpected character, please try again."); - } -} - -int reset_terminal_fd(int fd, bool switch_to_text) { - struct termios termios; - int r = 0; - - /* Set terminal to some sane defaults */ - - assert(fd >= 0); - - /* We leave locked terminal attributes untouched, so that - * Plymouth may set whatever it wants to set, and we don't - * interfere with that. */ - - /* Disable exclusive mode, just in case */ - ioctl(fd, TIOCNXCL); - - /* Switch to text mode */ - if (switch_to_text) - ioctl(fd, KDSETMODE, KD_TEXT); - - /* Enable console unicode mode */ - ioctl(fd, KDSKBMODE, K_UNICODE); - - if (tcgetattr(fd, &termios) < 0) { - r = -errno; - goto finish; - } - - /* We only reset the stuff that matters to the software. How - * hardware is set up we don't touch assuming that somebody - * else will do that for us */ - - termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); - termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; - termios.c_oflag |= ONLCR; - termios.c_cflag |= CREAD; - termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; - - termios.c_cc[VINTR] = 03; /* ^C */ - termios.c_cc[VQUIT] = 034; /* ^\ */ - termios.c_cc[VERASE] = 0177; - termios.c_cc[VKILL] = 025; /* ^X */ - termios.c_cc[VEOF] = 04; /* ^D */ - termios.c_cc[VSTART] = 021; /* ^Q */ - termios.c_cc[VSTOP] = 023; /* ^S */ - termios.c_cc[VSUSP] = 032; /* ^Z */ - termios.c_cc[VLNEXT] = 026; /* ^V */ - termios.c_cc[VWERASE] = 027; /* ^W */ - termios.c_cc[VREPRINT] = 022; /* ^R */ - termios.c_cc[VEOL] = 0; - termios.c_cc[VEOL2] = 0; - - termios.c_cc[VTIME] = 0; - termios.c_cc[VMIN] = 1; - - if (tcsetattr(fd, TCSANOW, &termios) < 0) - r = -errno; - -finish: - /* Just in case, flush all crap out */ - tcflush(fd, TCIOFLUSH); - - return r; -} - -int reset_terminal(const char *name) { - int fd, r; - - fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return fd; - - r = reset_terminal_fd(fd, true); - close_nointr_nofail(fd); - - return r; -} - -int open_terminal(const char *name, int mode) { - int fd, r; - unsigned c = 0; - - /* - * If a TTY is in the process of being closed opening it might - * cause EIO. This is horribly awful, but unlikely to be - * changed in the kernel. Hence we work around this problem by - * retrying a couple of times. - * - * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 - */ - - for (;;) { - if ((fd = open(name, mode)) >= 0) - break; - - if (errno != EIO) - return -errno; - - if (c >= 20) - return -errno; - - usleep(50 * USEC_PER_MSEC); - c++; - } - - if (fd < 0) - return -errno; - - if ((r = isatty(fd)) < 0) { - close_nointr_nofail(fd); - return -errno; - } - - if (!r) { - close_nointr_nofail(fd); - return -ENOTTY; - } - - return fd; -} - -int flush_fd(int fd) { - struct pollfd pollfd; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = POLLIN; - - for (;;) { - char buf[LINE_MAX]; - ssize_t l; - int r; - - if ((r = poll(&pollfd, 1, 0)) < 0) { - - if (errno == EINTR) - continue; - - return -errno; - } - - if (r == 0) - return 0; - - if ((l = read(fd, buf, sizeof(buf))) < 0) { - - if (errno == EINTR) - continue; - - if (errno == EAGAIN) - return 0; - - return -errno; - } - - if (l <= 0) - return 0; - } -} - -int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) { - int fd = -1, notify = -1, r, wd = -1; - - assert(name); - - /* We use inotify to be notified when the tty is closed. We - * create the watch before checking if we can actually acquire - * it, so that we don't lose any event. - * - * Note: strictly speaking this actually watches for the - * device being closed, it does *not* really watch whether a - * tty loses its controlling process. However, unless some - * rogue process uses TIOCNOTTY on /dev/tty *after* closing - * its tty otherwise this will not become a problem. As long - * as the administrator makes sure not configure any service - * on the same tty as an untrusted user this should not be a - * problem. (Which he probably should not do anyway.) */ - - if (!fail && !force) { - if ((notify = inotify_init1(IN_CLOEXEC)) < 0) { - r = -errno; - goto fail; - } - - if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) { - r = -errno; - goto fail; - } - } - - for (;;) { - if (notify >= 0) - if ((r = flush_fd(notify)) < 0) - goto fail; - - /* We pass here O_NOCTTY only so that we can check the return - * value TIOCSCTTY and have a reliable way to figure out if we - * successfully became the controlling process of the tty */ - if ((fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0) - return fd; - - /* First, try to get the tty */ - r = ioctl(fd, TIOCSCTTY, force); - - /* Sometimes it makes sense to ignore TIOCSCTTY - * returning EPERM, i.e. when very likely we already - * are have this controlling terminal. */ - if (r < 0 && errno == EPERM && ignore_tiocstty_eperm) - r = 0; - - if (r < 0 && (force || fail || errno != EPERM)) { - r = -errno; - goto fail; - } - - if (r >= 0) - break; - - assert(!fail); - assert(!force); - assert(notify >= 0); - - for (;;) { - uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX]; - ssize_t l; - struct inotify_event *e; - - if ((l = read(notify, inotify_buffer, sizeof(inotify_buffer))) < 0) { - - if (errno == EINTR) - continue; - - r = -errno; - goto fail; - } - - e = (struct inotify_event*) inotify_buffer; - - while (l > 0) { - size_t step; - - if (e->wd != wd || !(e->mask & IN_CLOSE)) { - r = -EIO; - goto fail; - } - - step = sizeof(struct inotify_event) + e->len; - assert(step <= (size_t) l); - - e = (struct inotify_event*) ((uint8_t*) e + step); - l -= step; - } - - break; - } - - /* We close the tty fd here since if the old session - * ended our handle will be dead. It's important that - * we do this after sleeping, so that we don't enter - * an endless loop. */ - close_nointr_nofail(fd); - } - - if (notify >= 0) - close_nointr_nofail(notify); - - r = reset_terminal_fd(fd, true); - if (r < 0) - log_warning("Failed to reset terminal: %s", strerror(-r)); - - return fd; - -fail: - if (fd >= 0) - close_nointr_nofail(fd); - - if (notify >= 0) - close_nointr_nofail(notify); - - return r; -} - -int release_terminal(void) { - int r = 0, fd; - struct sigaction sa_old, sa_new; - - if ((fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC)) < 0) - return -errno; - - /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed - * by our own TIOCNOTTY */ - - zero(sa_new); - sa_new.sa_handler = SIG_IGN; - sa_new.sa_flags = SA_RESTART; - assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); - - if (ioctl(fd, TIOCNOTTY) < 0) - r = -errno; - - assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); - - close_nointr_nofail(fd); - return r; -} - -int sigaction_many(const struct sigaction *sa, ...) { - va_list ap; - int r = 0, sig; - - va_start(ap, sa); - while ((sig = va_arg(ap, int)) > 0) - if (sigaction(sig, sa, NULL) < 0) - r = -errno; - va_end(ap); - - return r; -} - -int ignore_signals(int sig, ...) { - struct sigaction sa; - va_list ap; - int r = 0; - - zero(sa); - sa.sa_handler = SIG_IGN; - sa.sa_flags = SA_RESTART; - - if (sigaction(sig, &sa, NULL) < 0) - r = -errno; - - va_start(ap, sig); - while ((sig = va_arg(ap, int)) > 0) - if (sigaction(sig, &sa, NULL) < 0) - r = -errno; - va_end(ap); - - return r; -} - -int default_signals(int sig, ...) { - struct sigaction sa; - va_list ap; - int r = 0; - - zero(sa); - sa.sa_handler = SIG_DFL; - sa.sa_flags = SA_RESTART; - - if (sigaction(sig, &sa, NULL) < 0) - r = -errno; - - va_start(ap, sig); - while ((sig = va_arg(ap, int)) > 0) - if (sigaction(sig, &sa, NULL) < 0) - r = -errno; - va_end(ap); - - return r; -} - -int close_pipe(int p[]) { - int a = 0, b = 0; - - assert(p); - - if (p[0] >= 0) { - a = close_nointr(p[0]); - p[0] = -1; - } - - if (p[1] >= 0) { - b = close_nointr(p[1]); - p[1] = -1; - } - - return a < 0 ? a : b; -} - -ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) { - uint8_t *p; - ssize_t n = 0; - - assert(fd >= 0); - assert(buf); - - p = buf; - - while (nbytes > 0) { - ssize_t k; - - if ((k = read(fd, p, nbytes)) <= 0) { - - if (k < 0 && errno == EINTR) - continue; - - if (k < 0 && errno == EAGAIN && do_poll) { - struct pollfd pollfd; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = POLLIN; - - if (poll(&pollfd, 1, -1) < 0) { - if (errno == EINTR) - continue; - - return n > 0 ? n : -errno; - } - - if (pollfd.revents != POLLIN) - return n > 0 ? n : -EIO; - - continue; - } - - return n > 0 ? n : (k < 0 ? -errno : 0); - } - - p += k; - nbytes -= k; - n += k; - } - - return n; -} - -ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) { - const uint8_t *p; - ssize_t n = 0; - - assert(fd >= 0); - assert(buf); - - p = buf; - - while (nbytes > 0) { - ssize_t k; - - k = write(fd, p, nbytes); - if (k <= 0) { - - if (k < 0 && errno == EINTR) - continue; - - if (k < 0 && errno == EAGAIN && do_poll) { - struct pollfd pollfd; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = POLLOUT; - - if (poll(&pollfd, 1, -1) < 0) { - if (errno == EINTR) - continue; - - return n > 0 ? n : -errno; - } - - if (pollfd.revents != POLLOUT) - return n > 0 ? n : -EIO; - - continue; - } - - return n > 0 ? n : (k < 0 ? -errno : 0); - } - - p += k; - nbytes -= k; - n += k; - } - - return n; -} - -int path_is_mount_point(const char *t, bool allow_symlink) { - struct stat a, b; - char *parent; - int r; - - if (allow_symlink) - r = stat(t, &a); - else - r = lstat(t, &a); - - if (r < 0) { - if (errno == ENOENT) - return 0; - - return -errno; - } - - r = parent_of_path(t, &parent); - if (r < 0) - return r; - - r = lstat(parent, &b); - free(parent); - - if (r < 0) - return -errno; - - return a.st_dev != b.st_dev; -} - -int parse_usec(const char *t, usec_t *usec) { - static const struct { - const char *suffix; - usec_t usec; - } table[] = { - { "sec", USEC_PER_SEC }, - { "s", USEC_PER_SEC }, - { "min", USEC_PER_MINUTE }, - { "hr", USEC_PER_HOUR }, - { "h", USEC_PER_HOUR }, - { "d", USEC_PER_DAY }, - { "w", USEC_PER_WEEK }, - { "msec", USEC_PER_MSEC }, - { "ms", USEC_PER_MSEC }, - { "m", USEC_PER_MINUTE }, - { "usec", 1ULL }, - { "us", 1ULL }, - { "", USEC_PER_SEC }, - }; - - const char *p; - usec_t r = 0; - - assert(t); - assert(usec); - - p = t; - do { - long long l; - char *e; - unsigned i; - - errno = 0; - l = strtoll(p, &e, 10); - - if (errno != 0) - return -errno; - - if (l < 0) - return -ERANGE; - - if (e == p) - return -EINVAL; - - e += strspn(e, WHITESPACE); - - for (i = 0; i < ELEMENTSOF(table); i++) - if (startswith(e, table[i].suffix)) { - r += (usec_t) l * table[i].usec; - p = e + strlen(table[i].suffix); - break; - } - - if (i >= ELEMENTSOF(table)) - return -EINVAL; - - } while (*p != 0); - - *usec = r; - - return 0; -} - -int parse_bytes(const char *t, off_t *bytes) { - static const struct { - const char *suffix; - off_t factor; - } table[] = { - { "B", 1 }, - { "K", 1024ULL }, - { "M", 1024ULL*1024ULL }, - { "G", 1024ULL*1024ULL*1024ULL }, - { "T", 1024ULL*1024ULL*1024ULL*1024ULL }, - { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL }, - { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL }, - { "", 1 }, - }; - - const char *p; - off_t r = 0; - - assert(t); - assert(bytes); - - p = t; - do { - long long l; - char *e; - unsigned i; - - errno = 0; - l = strtoll(p, &e, 10); - - if (errno != 0) - return -errno; - - if (l < 0) - return -ERANGE; - - if (e == p) - return -EINVAL; - - e += strspn(e, WHITESPACE); - - for (i = 0; i < ELEMENTSOF(table); i++) - if (startswith(e, table[i].suffix)) { - r += (off_t) l * table[i].factor; - p = e + strlen(table[i].suffix); - break; - } - - if (i >= ELEMENTSOF(table)) - return -EINVAL; - - } while (*p != 0); - - *bytes = r; - - return 0; -} - -int make_stdio(int fd) { - int r, s, t; - - assert(fd >= 0); - - r = dup2(fd, STDIN_FILENO); - s = dup2(fd, STDOUT_FILENO); - t = dup2(fd, STDERR_FILENO); - - if (fd >= 3) - close_nointr_nofail(fd); - - if (r < 0 || s < 0 || t < 0) - return -errno; - - fd_cloexec(STDIN_FILENO, false); - fd_cloexec(STDOUT_FILENO, false); - fd_cloexec(STDERR_FILENO, false); - - return 0; -} - -int make_null_stdio(void) { - int null_fd; - - if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) - return -errno; - - return make_stdio(null_fd); -} - -bool is_device_path(const char *path) { - - /* Returns true on paths that refer to a device, either in - * sysfs or in /dev */ - - return - path_startswith(path, "/dev/") || - path_startswith(path, "/sys/"); -} - -int dir_is_empty(const char *path) { - DIR *d; - int r; - struct dirent buf, *de; - - if (!(d = opendir(path))) - return -errno; - - for (;;) { - if ((r = readdir_r(d, &buf, &de)) > 0) { - r = -r; - break; - } - - if (!de) { - r = 1; - break; - } - - if (!ignore_file(de->d_name)) { - r = 0; - break; - } - } - - closedir(d); - return r; -} - -unsigned long long random_ull(void) { - int fd; - uint64_t ull; - ssize_t r; - - if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0) - goto fallback; - - r = loop_read(fd, &ull, sizeof(ull), true); - close_nointr_nofail(fd); - - if (r != sizeof(ull)) - goto fallback; - - return ull; - -fallback: - return random() * RAND_MAX + random(); -} - -void rename_process(const char name[8]) { - assert(name); - - /* This is a like a poor man's setproctitle(). It changes the - * comm field, argv[0], and also the glibc's internally used - * name of the process. For the first one a limit of 16 chars - * applies, to the second one usually one of 10 (i.e. length - * of "/sbin/init"), to the third one one of 7 (i.e. length of - * "systemd"). If you pass a longer string it will be - * truncated */ - - prctl(PR_SET_NAME, name); - - if (program_invocation_name) - strncpy(program_invocation_name, name, strlen(program_invocation_name)); - - if (saved_argc > 0) { - int i; - - if (saved_argv[0]) - strncpy(saved_argv[0], name, strlen(saved_argv[0])); - - for (i = 1; i < saved_argc; i++) { - if (!saved_argv[i]) - break; - - memset(saved_argv[i], 0, strlen(saved_argv[i])); - } - } -} - -void sigset_add_many(sigset_t *ss, ...) { - va_list ap; - int sig; - - assert(ss); - - va_start(ap, ss); - while ((sig = va_arg(ap, int)) > 0) - assert_se(sigaddset(ss, sig) == 0); - va_end(ap); -} - -char* gethostname_malloc(void) { - struct utsname u; - - assert_se(uname(&u) >= 0); - - if (u.nodename[0]) - return strdup(u.nodename); - - return strdup(u.sysname); -} - -char* getlogname_malloc(void) { - uid_t uid; - long bufsize; - char *buf, *name; - struct passwd pwbuf, *pw = NULL; - struct stat st; - - if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0) - uid = st.st_uid; - else - uid = getuid(); - - /* Shortcut things to avoid NSS lookups */ - if (uid == 0) - return strdup("root"); - - if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) <= 0) - bufsize = 4096; - - if (!(buf = malloc(bufsize))) - return NULL; - - if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) { - name = strdup(pw->pw_name); - free(buf); - return name; - } - - free(buf); - - if (asprintf(&name, "%lu", (unsigned long) uid) < 0) - return NULL; - - return name; -} - -int getttyname_malloc(int fd, char **r) { - char path[PATH_MAX], *c; - int k; - - assert(r); - - if ((k = ttyname_r(fd, path, sizeof(path))) != 0) - return -k; - - char_array_0(path); - - if (!(c = strdup(startswith(path, "/dev/") ? path + 5 : path))) - return -ENOMEM; - - *r = c; - return 0; -} - -int getttyname_harder(int fd, char **r) { - int k; - char *s; - - if ((k = getttyname_malloc(fd, &s)) < 0) - return k; - - if (streq(s, "tty")) { - free(s); - return get_ctty(0, NULL, r); - } - - *r = s; - return 0; -} - -int get_ctty_devnr(pid_t pid, dev_t *d) { - int k; - char line[LINE_MAX], *p, *fn; - unsigned long ttynr; - FILE *f; - - if (asprintf(&fn, "/proc/%lu/stat", (unsigned long) (pid <= 0 ? getpid() : pid)) < 0) - return -ENOMEM; - - f = fopen(fn, "re"); - free(fn); - if (!f) - return -errno; - - if (!fgets(line, sizeof(line), f)) { - k = feof(f) ? -EIO : -errno; - fclose(f); - return k; - } - - fclose(f); - - p = strrchr(line, ')'); - if (!p) - return -EIO; - - p++; - - if (sscanf(p, " " - "%*c " /* state */ - "%*d " /* ppid */ - "%*d " /* pgrp */ - "%*d " /* session */ - "%lu ", /* ttynr */ - &ttynr) != 1) - return -EIO; - - *d = (dev_t) ttynr; - return 0; -} - -int get_ctty(pid_t pid, dev_t *_devnr, char **r) { - int k; - char fn[PATH_MAX], *s, *b, *p; - dev_t devnr; - - assert(r); - - k = get_ctty_devnr(pid, &devnr); - if (k < 0) - return k; - - snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr)); - char_array_0(fn); - - if ((k = readlink_malloc(fn, &s)) < 0) { - - if (k != -ENOENT) - return k; - - /* This is an ugly hack */ - if (major(devnr) == 136) { - if (asprintf(&b, "pts/%lu", (unsigned long) minor(devnr)) < 0) - return -ENOMEM; - - *r = b; - if (_devnr) - *_devnr = devnr; - - return 0; - } - - /* Probably something like the ptys which have no - * symlink in /dev/char. Let's return something - * vaguely useful. */ - - if (!(b = strdup(fn + 5))) - return -ENOMEM; - - *r = b; - if (_devnr) - *_devnr = devnr; - - return 0; - } - - if (startswith(s, "/dev/")) - p = s + 5; - else if (startswith(s, "../")) - p = s + 3; - else - p = s; - - b = strdup(p); - free(s); - - if (!b) - return -ENOMEM; - - *r = b; - if (_devnr) - *_devnr = devnr; - - return 0; -} - -static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) { - DIR *d; - int ret = 0; - - assert(fd >= 0); - - /* This returns the first error we run into, but nevertheless - * tries to go on */ - - if (!(d = fdopendir(fd))) { - close_nointr_nofail(fd); - - return errno == ENOENT ? 0 : -errno; - } - - for (;;) { - struct dirent buf, *de; - bool is_dir, keep_around = false; - int r; - - if ((r = readdir_r(d, &buf, &de)) != 0) { - if (ret == 0) - ret = -r; - break; - } - - if (!de) - break; - - if (streq(de->d_name, ".") || streq(de->d_name, "..")) - continue; - - if (de->d_type == DT_UNKNOWN) { - struct stat st; - - if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - continue; - } - - if (honour_sticky) - keep_around = - (st.st_uid == 0 || st.st_uid == getuid()) && - (st.st_mode & S_ISVTX); - - is_dir = S_ISDIR(st.st_mode); - - } else { - if (honour_sticky) { - struct stat st; - - if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - continue; - } - - keep_around = - (st.st_uid == 0 || st.st_uid == getuid()) && - (st.st_mode & S_ISVTX); - } - - is_dir = de->d_type == DT_DIR; - } - - if (is_dir) { - int subdir_fd; - - subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW); - if (subdir_fd < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - continue; - } - - if ((r = rm_rf_children(subdir_fd, only_dirs, honour_sticky)) < 0) { - if (ret == 0) - ret = r; - } - - if (!keep_around) - if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - } - - } else if (!only_dirs && !keep_around) { - - if (unlinkat(fd, de->d_name, 0) < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - } - } - } - - closedir(d); - - return ret; -} - -int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) { - int fd; - int r; - - assert(path); - - if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) { - - if (errno != ENOTDIR) - return -errno; - - if (delete_root && !only_dirs) - if (unlink(path) < 0) - return -errno; - - return 0; - } - - r = rm_rf_children(fd, only_dirs, honour_sticky); - - if (delete_root) { - - if (honour_sticky && file_is_priv_sticky(path) > 0) - return r; - - if (rmdir(path) < 0 && errno != ENOENT) { - if (r == 0) - r = -errno; - } - } - - return r; -} - -int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) { - assert(path); - - /* Under the assumption that we are running privileged we - * first change the access mode and only then hand out - * ownership to avoid a window where access is too open. */ - - if (mode != (mode_t) -1) - if (chmod(path, mode) < 0) - return -errno; - - if (uid != (uid_t) -1 || gid != (gid_t) -1) - if (chown(path, uid, gid) < 0) - return -errno; - - return 0; -} - -int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) { - assert(fd >= 0); - - /* Under the assumption that we are running privileged we - * first change the access mode and only then hand out - * ownership to avoid a window where access is too open. */ - - if (fchmod(fd, mode) < 0) - return -errno; - - if (fchown(fd, uid, gid) < 0) - return -errno; - - return 0; -} - -cpu_set_t* cpu_set_malloc(unsigned *ncpus) { - cpu_set_t *r; - unsigned n = 1024; - - /* Allocates the cpuset in the right size */ - - for (;;) { - if (!(r = CPU_ALLOC(n))) - return NULL; - - if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) { - CPU_ZERO_S(CPU_ALLOC_SIZE(n), r); - - if (ncpus) - *ncpus = n; - - return r; - } - - CPU_FREE(r); - - if (errno != EINVAL) - return NULL; - - n *= 2; - } -} - -void status_vprintf(const char *status, bool ellipse, const char *format, va_list ap) { - char *s = NULL, *spaces = NULL, *e; - int fd = -1, c; - size_t emax, sl, left; - struct iovec iovec[5]; - int n = 0; - - assert(format); - - /* This independent of logging, as status messages are - * optional and go exclusively to the console. */ - - if (vasprintf(&s, format, ap) < 0) - goto finish; - - fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - goto finish; - - if (ellipse) { - c = fd_columns(fd); - if (c <= 0) - c = 80; - - if (status) { - sl = 2 + 6 + 1; /* " [" status "]" */ - emax = (size_t) c > sl ? c - sl - 1 : 0; - } else - emax = c - 1; - - e = ellipsize(s, emax, 75); - if (e) { - free(s); - s = e; - } - } - - zero(iovec); - IOVEC_SET_STRING(iovec[n++], s); - - if (ellipse) { - sl = strlen(s); - left = emax > sl ? emax - sl : 0; - if (left > 0) { - spaces = malloc(left); - if (spaces) { - memset(spaces, ' ', left); - iovec[n].iov_base = spaces; - iovec[n].iov_len = left; - n++; - } - } - } - - if (status) { - IOVEC_SET_STRING(iovec[n++], " ["); - IOVEC_SET_STRING(iovec[n++], status); - IOVEC_SET_STRING(iovec[n++], "]\n"); - } else - IOVEC_SET_STRING(iovec[n++], "\n"); - - writev(fd, iovec, n); - -finish: - free(s); - free(spaces); - - if (fd >= 0) - close_nointr_nofail(fd); -} - -void status_printf(const char *status, bool ellipse, const char *format, ...) { - va_list ap; - - assert(format); - - va_start(ap, format); - status_vprintf(status, ellipse, format, ap); - va_end(ap); -} - -void status_welcome(void) { - char *pretty_name = NULL, *ansi_color = NULL; - const char *const_pretty = NULL, *const_color = NULL; - int r; - - if ((r = parse_env_file("/etc/os-release", NEWLINE, - "PRETTY_NAME", &pretty_name, - "ANSI_COLOR", &ansi_color, - NULL)) < 0) { - - if (r != -ENOENT) - log_warning("Failed to read /etc/os-release: %s", strerror(-r)); - } - - if (!pretty_name && !const_pretty) - const_pretty = "Linux"; - - if (!ansi_color && !const_color) - const_color = "1"; - - status_printf(NULL, - false, - "\nWelcome to \x1B[%sm%s\x1B[0m!\n", - const_color ? const_color : ansi_color, - const_pretty ? const_pretty : pretty_name); - - free(ansi_color); - free(pretty_name); -} - -char *replace_env(const char *format, char **env) { - enum { - WORD, - CURLY, - VARIABLE - } state = WORD; - - const char *e, *word = format; - char *r = NULL, *k; - - assert(format); - - for (e = format; *e; e ++) { - - switch (state) { - - case WORD: - if (*e == '$') - state = CURLY; - break; - - case CURLY: - if (*e == '{') { - if (!(k = strnappend(r, word, e-word-1))) - goto fail; - - free(r); - r = k; - - word = e-1; - state = VARIABLE; - - } else if (*e == '$') { - if (!(k = strnappend(r, word, e-word))) - goto fail; - - free(r); - r = k; - - word = e+1; - state = WORD; - } else - state = WORD; - break; - - case VARIABLE: - if (*e == '}') { - const char *t; - - if (!(t = strv_env_get_with_length(env, word+2, e-word-2))) - t = ""; - - if (!(k = strappend(r, t))) - goto fail; - - free(r); - r = k; - - word = e+1; - state = WORD; - } - break; - } - } - - if (!(k = strnappend(r, word, e-word))) - goto fail; - - free(r); - return k; - -fail: - free(r); - return NULL; -} - -char **replace_env_argv(char **argv, char **env) { - char **r, **i; - unsigned k = 0, l = 0; - - l = strv_length(argv); - - if (!(r = new(char*, l+1))) - return NULL; - - STRV_FOREACH(i, argv) { - - /* If $FOO appears as single word, replace it by the split up variable */ - if ((*i)[0] == '$' && (*i)[1] != '{') { - char *e; - char **w, **m; - unsigned q; - - if ((e = strv_env_get(env, *i+1))) { - - if (!(m = strv_split_quoted(e))) { - r[k] = NULL; - strv_free(r); - return NULL; - } - } else - m = NULL; - - q = strv_length(m); - l = l + q - 1; - - if (!(w = realloc(r, sizeof(char*) * (l+1)))) { - r[k] = NULL; - strv_free(r); - strv_free(m); - return NULL; - } - - r = w; - if (m) { - memcpy(r + k, m, q * sizeof(char*)); - free(m); - } - - k += q; - continue; - } - - /* If ${FOO} appears as part of a word, replace it by the variable as-is */ - if (!(r[k++] = replace_env(*i, env))) { - strv_free(r); - return NULL; - } - } - - r[k] = NULL; - return r; -} - -int fd_columns(int fd) { - struct winsize ws; - zero(ws); - - if (ioctl(fd, TIOCGWINSZ, &ws) < 0) - return -errno; - - if (ws.ws_col <= 0) - return -EIO; - - return ws.ws_col; -} - -unsigned columns(void) { - static __thread int parsed_columns = 0; - const char *e; - - if (_likely_(parsed_columns > 0)) - return parsed_columns; - - e = getenv("COLUMNS"); - if (e) - parsed_columns = atoi(e); - - if (parsed_columns <= 0) - parsed_columns = fd_columns(STDOUT_FILENO); - - if (parsed_columns <= 0) - parsed_columns = 80; - - return parsed_columns; -} - -int fd_lines(int fd) { - struct winsize ws; - zero(ws); - - if (ioctl(fd, TIOCGWINSZ, &ws) < 0) - return -errno; - - if (ws.ws_row <= 0) - return -EIO; - - return ws.ws_row; -} - -unsigned lines(void) { - static __thread int parsed_lines = 0; - const char *e; - - if (_likely_(parsed_lines > 0)) - return parsed_lines; - - e = getenv("LINES"); - if (e) - parsed_lines = atoi(e); - - if (parsed_lines <= 0) - parsed_lines = fd_lines(STDOUT_FILENO); - - if (parsed_lines <= 0) - parsed_lines = 25; - - return parsed_lines; -} - -int running_in_chroot(void) { - struct stat a, b; - - zero(a); - zero(b); - - /* Only works as root */ - - if (stat("/proc/1/root", &a) < 0) - return -errno; - - if (stat("/", &b) < 0) - return -errno; - - return - a.st_dev != b.st_dev || - a.st_ino != b.st_ino; -} - -char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) { - size_t x; - char *r; - - assert(s); - assert(percent <= 100); - assert(new_length >= 3); - - if (old_length <= 3 || old_length <= new_length) - return strndup(s, old_length); - - r = new0(char, new_length+1); - if (!r) - return r; - - x = (new_length * percent) / 100; - - if (x > new_length - 3) - x = new_length - 3; - - memcpy(r, s, x); - r[x] = '.'; - r[x+1] = '.'; - r[x+2] = '.'; - memcpy(r + x + 3, - s + old_length - (new_length - x - 3), - new_length - x - 3); - - return r; -} - -char *ellipsize(const char *s, size_t length, unsigned percent) { - return ellipsize_mem(s, strlen(s), length, percent); -} - -int touch(const char *path) { - int fd; - - assert(path); - - if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644)) < 0) - return -errno; - - close_nointr_nofail(fd); - return 0; -} - -char *unquote(const char *s, const char* quotes) { - size_t l; - assert(s); - - l = strlen(s); - if (l < 2) - return strdup(s); - - if (strchr(quotes, s[0]) && s[l-1] == s[0]) - return strndup(s+1, l-2); - - return strdup(s); -} - -char *normalize_env_assignment(const char *s) { - char *name, *value, *p, *r; - - p = strchr(s, '='); - - if (!p) { - if (!(r = strdup(s))) - return NULL; - - return strstrip(r); - } - - if (!(name = strndup(s, p - s))) - return NULL; - - if (!(p = strdup(p+1))) { - free(name); - return NULL; - } - - value = unquote(strstrip(p), QUOTES); - free(p); - - if (!value) { - free(name); - return NULL; - } - - if (asprintf(&r, "%s=%s", name, value) < 0) - r = NULL; - - free(value); - free(name); - - return r; -} - -int wait_for_terminate(pid_t pid, siginfo_t *status) { - siginfo_t dummy; - - assert(pid >= 1); - - if (!status) - status = &dummy; - - for (;;) { - zero(*status); - - if (waitid(P_PID, pid, status, WEXITED) < 0) { - - if (errno == EINTR) - continue; - - return -errno; - } - - return 0; - } -} - -int wait_for_terminate_and_warn(const char *name, pid_t pid) { - int r; - siginfo_t status; - - assert(name); - assert(pid > 1); - - if ((r = wait_for_terminate(pid, &status)) < 0) { - log_warning("Failed to wait for %s: %s", name, strerror(-r)); - return r; - } - - if (status.si_code == CLD_EXITED) { - if (status.si_status != 0) { - log_warning("%s failed with error code %i.", name, status.si_status); - return status.si_status; - } - - log_debug("%s succeeded.", name); - return 0; - - } else if (status.si_code == CLD_KILLED || - status.si_code == CLD_DUMPED) { - - log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status)); - return -EPROTO; - } - - log_warning("%s failed due to unknown reason.", name); - return -EPROTO; - -} - -_noreturn_ void freeze(void) { - - /* Make sure nobody waits for us on a socket anymore */ - close_all_fds(NULL, 0); - - sync(); - - for (;;) - pause(); -} - -bool null_or_empty(struct stat *st) { - assert(st); - - if (S_ISREG(st->st_mode) && st->st_size <= 0) - return true; - - if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode)) - return true; - - return false; -} - -int null_or_empty_path(const char *fn) { - struct stat st; - - assert(fn); - - if (stat(fn, &st) < 0) - return -errno; - - return null_or_empty(&st); -} - -DIR *xopendirat(int fd, const char *name, int flags) { - int nfd; - DIR *d; - - if ((nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags)) < 0) - return NULL; - - if (!(d = fdopendir(nfd))) { - close_nointr_nofail(nfd); - return NULL; - } - - return d; -} - -int signal_from_string_try_harder(const char *s) { - int signo; - assert(s); - - if ((signo = signal_from_string(s)) <= 0) - if (startswith(s, "SIG")) - return signal_from_string(s+3); - - return signo; -} - -void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) { - - assert(f); - assert(name); - assert(t); - - if (!dual_timestamp_is_set(t)) - return; - - fprintf(f, "%s=%llu %llu\n", - name, - (unsigned long long) t->realtime, - (unsigned long long) t->monotonic); -} - -void dual_timestamp_deserialize(const char *value, dual_timestamp *t) { - unsigned long long a, b; - - assert(value); - assert(t); - - if (sscanf(value, "%lli %llu", &a, &b) != 2) - log_debug("Failed to parse finish timestamp value %s", value); - else { - t->realtime = a; - t->monotonic = b; - } -} - -char *fstab_node_to_udev_node(const char *p) { - char *dn, *t, *u; - int r; - - /* FIXME: to follow udev's logic 100% we need to leave valid - * UTF8 chars unescaped */ - - if (startswith(p, "LABEL=")) { - - if (!(u = unquote(p+6, "\"\'"))) - return NULL; - - t = xescape(u, "/ "); - free(u); - - if (!t) - return NULL; - - r = asprintf(&dn, "/dev/disk/by-label/%s", t); - free(t); - - if (r < 0) - return NULL; - - return dn; - } - - if (startswith(p, "UUID=")) { - - if (!(u = unquote(p+5, "\"\'"))) - return NULL; - - t = xescape(u, "/ "); - free(u); - - if (!t) - return NULL; - - r = asprintf(&dn, "/dev/disk/by-uuid/%s", t); - free(t); - - if (r < 0) - return NULL; - - return dn; - } - - return strdup(p); -} - -void filter_environ(const char *prefix) { - int i, j; - assert(prefix); - - if (!environ) - return; - - for (i = 0, j = 0; environ[i]; i++) { - - if (startswith(environ[i], prefix)) - continue; - - environ[j++] = environ[i]; - } - - environ[j] = NULL; -} - -bool tty_is_vc(const char *tty) { - assert(tty); - - if (startswith(tty, "/dev/")) - tty += 5; - - return vtnr_from_tty(tty) >= 0; -} - -int vtnr_from_tty(const char *tty) { - int i, r; - - assert(tty); - - if (startswith(tty, "/dev/")) - tty += 5; - - if (!startswith(tty, "tty") ) - return -EINVAL; - - if (tty[3] < '0' || tty[3] > '9') - return -EINVAL; - - r = safe_atoi(tty+3, &i); - if (r < 0) - return r; - - if (i < 0 || i > 63) - return -EINVAL; - - return i; -} - -bool tty_is_vc_resolve(const char *tty) { - char *active = NULL; - bool b; - - assert(tty); - - if (startswith(tty, "/dev/")) - tty += 5; - - /* Resolve where /dev/console is pointing to */ - if (streq(tty, "console")) - if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) { - /* If multiple log outputs are configured the - * last one is what /dev/console points to */ - tty = strrchr(active, ' '); - if (tty) - tty++; - else - tty = active; - } - - b = tty_is_vc(tty); - free(active); - - return b; -} - -const char *default_term_for_tty(const char *tty) { - assert(tty); - - return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt100"; -} - -bool dirent_is_file(const struct dirent *de) { - assert(de); - - if (ignore_file(de->d_name)) - return false; - - if (de->d_type != DT_REG && - de->d_type != DT_LNK && - de->d_type != DT_UNKNOWN) - return false; - - return true; -} - -bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) { - assert(de); - - if (!dirent_is_file(de)) - return false; - - return endswith(de->d_name, suffix); -} - -void execute_directory(const char *directory, DIR *d, char *argv[]) { - DIR *_d = NULL; - struct dirent *de; - Hashmap *pids = NULL; - - assert(directory); - - /* Executes all binaries in a directory in parallel and waits - * until all they all finished. */ - - if (!d) { - if (!(_d = opendir(directory))) { - - if (errno == ENOENT) - return; - - log_error("Failed to enumerate directory %s: %m", directory); - return; - } - - d = _d; - } - - if (!(pids = hashmap_new(trivial_hash_func, trivial_compare_func))) { - log_error("Failed to allocate set."); - goto finish; - } - - while ((de = readdir(d))) { - char *path; - pid_t pid; - int k; - - if (!dirent_is_file(de)) - continue; - - if (asprintf(&path, "%s/%s", directory, de->d_name) < 0) { - log_error("Out of memory"); - continue; - } - - if ((pid = fork()) < 0) { - log_error("Failed to fork: %m"); - free(path); - continue; - } - - if (pid == 0) { - char *_argv[2]; - /* Child */ - - if (!argv) { - _argv[0] = path; - _argv[1] = NULL; - argv = _argv; - } else - if (!argv[0]) - argv[0] = path; - - execv(path, argv); - - log_error("Failed to execute %s: %m", path); - _exit(EXIT_FAILURE); - } - - log_debug("Spawned %s as %lu", path, (unsigned long) pid); - - if ((k = hashmap_put(pids, UINT_TO_PTR(pid), path)) < 0) { - log_error("Failed to add PID to set: %s", strerror(-k)); - free(path); - } - } - - while (!hashmap_isempty(pids)) { - pid_t pid = PTR_TO_UINT(hashmap_first_key(pids)); - siginfo_t si; - char *path; - - zero(si); - if (waitid(P_PID, pid, &si, WEXITED) < 0) { - - if (errno == EINTR) - continue; - - log_error("waitid() failed: %m"); - goto finish; - } - - if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) { - if (!is_clean_exit(si.si_code, si.si_status)) { - if (si.si_code == CLD_EXITED) - log_error("%s exited with exit status %i.", path, si.si_status); - else - log_error("%s terminated by signal %s.", path, signal_to_string(si.si_status)); - } else - log_debug("%s exited successfully.", path); - - free(path); - } - } - -finish: - if (_d) - closedir(_d); - - if (pids) - hashmap_free_free(pids); -} - -int kill_and_sigcont(pid_t pid, int sig) { - int r; - - r = kill(pid, sig) < 0 ? -errno : 0; - - if (r >= 0) - kill(pid, SIGCONT); - - return r; -} - -bool nulstr_contains(const char*nulstr, const char *needle) { - const char *i; - - if (!nulstr) - return false; - - NULSTR_FOREACH(i, nulstr) - if (streq(i, needle)) - return true; - - return false; -} - -bool plymouth_running(void) { - return access("/run/plymouth/pid", F_OK) >= 0; -} - -void parse_syslog_priority(char **p, int *priority) { - int a = 0, b = 0, c = 0; - int k; - - assert(p); - assert(*p); - assert(priority); - - if ((*p)[0] != '<') - return; - - if (!strchr(*p, '>')) - return; - - if ((*p)[2] == '>') { - c = undecchar((*p)[1]); - k = 3; - } else if ((*p)[3] == '>') { - b = undecchar((*p)[1]); - c = undecchar((*p)[2]); - k = 4; - } else if ((*p)[4] == '>') { - a = undecchar((*p)[1]); - b = undecchar((*p)[2]); - c = undecchar((*p)[3]); - k = 5; - } else - return; - - if (a < 0 || b < 0 || c < 0) - return; - - *priority = a*100+b*10+c; - *p += k; -} - -void skip_syslog_pid(char **buf) { - char *p; - - assert(buf); - assert(*buf); - - p = *buf; - - if (*p != '[') - return; - - p++; - p += strspn(p, "0123456789"); - - if (*p != ']') - return; - - p++; - - *buf = p; -} - -void skip_syslog_date(char **buf) { - enum { - LETTER, - SPACE, - NUMBER, - SPACE_OR_NUMBER, - COLON - } sequence[] = { - LETTER, LETTER, LETTER, - SPACE, - SPACE_OR_NUMBER, NUMBER, - SPACE, - SPACE_OR_NUMBER, NUMBER, - COLON, - SPACE_OR_NUMBER, NUMBER, - COLON, - SPACE_OR_NUMBER, NUMBER, - SPACE - }; - - char *p; - unsigned i; - - assert(buf); - assert(*buf); - - p = *buf; - - for (i = 0; i < ELEMENTSOF(sequence); i++, p++) { - - if (!*p) - return; - - switch (sequence[i]) { - - case SPACE: - if (*p != ' ') - return; - break; - - case SPACE_OR_NUMBER: - if (*p == ' ') - break; - - /* fall through */ - - case NUMBER: - if (*p < '0' || *p > '9') - return; - - break; - - case LETTER: - if (!(*p >= 'A' && *p <= 'Z') && - !(*p >= 'a' && *p <= 'z')) - return; - - break; - - case COLON: - if (*p != ':') - return; - break; - - } - } - - *buf = p; -} - -int have_effective_cap(int value) { - cap_t cap; - cap_flag_value_t fv; - int r; - - if (!(cap = cap_get_proc())) - return -errno; - - if (cap_get_flag(cap, value, CAP_EFFECTIVE, &fv) < 0) - r = -errno; - else - r = fv == CAP_SET; - - cap_free(cap); - return r; -} - -char* strshorten(char *s, size_t l) { - assert(s); - - if (l < strlen(s)) - s[l] = 0; - - return s; -} - -static bool hostname_valid_char(char c) { - return - (c >= 'a' && c <= 'z') || - (c >= 'A' && c <= 'Z') || - (c >= '0' && c <= '9') || - c == '-' || - c == '_' || - c == '.'; -} - -bool hostname_is_valid(const char *s) { - const char *p; - - if (isempty(s)) - return false; - - for (p = s; *p; p++) - if (!hostname_valid_char(*p)) - return false; - - if (p-s > HOST_NAME_MAX) - return false; - - return true; -} - -char* hostname_cleanup(char *s) { - char *p, *d; - - for (p = s, d = s; *p; p++) - if ((*p >= 'a' && *p <= 'z') || - (*p >= 'A' && *p <= 'Z') || - (*p >= '0' && *p <= '9') || - *p == '-' || - *p == '_' || - *p == '.') - *(d++) = *p; - - *d = 0; - - strshorten(s, HOST_NAME_MAX); - return s; -} - -int pipe_eof(int fd) { - struct pollfd pollfd; - int r; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = POLLIN|POLLHUP; - - r = poll(&pollfd, 1, 0); - if (r < 0) - return -errno; - - if (r == 0) - return 0; - - return pollfd.revents & POLLHUP; -} - -int fd_wait_for_event(int fd, int event, usec_t t) { - struct pollfd pollfd; - int r; - - zero(pollfd); - pollfd.fd = fd; - pollfd.events = event; - - r = poll(&pollfd, 1, t == (usec_t) -1 ? -1 : (int) (t / USEC_PER_MSEC)); - if (r < 0) - return -errno; - - if (r == 0) - return 0; - - return pollfd.revents; -} - -int fopen_temporary(const char *path, FILE **_f, char **_temp_path) { - FILE *f; - char *t; - const char *fn; - size_t k; - int fd; - - assert(path); - assert(_f); - assert(_temp_path); - - t = new(char, strlen(path) + 1 + 6 + 1); - if (!t) - return -ENOMEM; - - fn = file_name_from_path(path); - k = fn-path; - memcpy(t, path, k); - t[k] = '.'; - stpcpy(stpcpy(t+k+1, fn), "XXXXXX"); - - fd = mkostemp(t, O_WRONLY|O_CLOEXEC); - if (fd < 0) { - free(t); - return -errno; - } - - f = fdopen(fd, "we"); - if (!f) { - unlink(t); - free(t); - return -errno; - } - - *_f = f; - *_temp_path = t; - - return 0; -} - -int terminal_vhangup_fd(int fd) { - assert(fd >= 0); - - if (ioctl(fd, TIOCVHANGUP) < 0) - return -errno; - - return 0; -} - -int terminal_vhangup(const char *name) { - int fd, r; - - fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return fd; - - r = terminal_vhangup_fd(fd); - close_nointr_nofail(fd); - - return r; -} - -int vt_disallocate(const char *name) { - int fd, r; - unsigned u; - - /* Deallocate the VT if possible. If not possible - * (i.e. because it is the active one), at least clear it - * entirely (including the scrollback buffer) */ - - if (!startswith(name, "/dev/")) - return -EINVAL; - - if (!tty_is_vc(name)) { - /* So this is not a VT. I guess we cannot deallocate - * it then. But let's at least clear the screen */ - - fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return fd; - - loop_write(fd, - "\033[r" /* clear scrolling region */ - "\033[H" /* move home */ - "\033[2J", /* clear screen */ - 10, false); - close_nointr_nofail(fd); - - return 0; - } - - if (!startswith(name, "/dev/tty")) - return -EINVAL; - - r = safe_atou(name+8, &u); - if (r < 0) - return r; - - if (u <= 0) - return -EINVAL; - - /* Try to deallocate */ - fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return fd; - - r = ioctl(fd, VT_DISALLOCATE, u); - close_nointr_nofail(fd); - - if (r >= 0) - return 0; - - if (errno != EBUSY) - return -errno; - - /* Couldn't deallocate, so let's clear it fully with - * scrollback */ - fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return fd; - - loop_write(fd, - "\033[r" /* clear scrolling region */ - "\033[H" /* move home */ - "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ - 10, false); - close_nointr_nofail(fd); - - return 0; -} - -static int files_add(Hashmap *h, const char *path, const char *suffix) { - DIR *dir; - struct dirent buffer, *de; - int r = 0; - - dir = opendir(path); - if (!dir) { - if (errno == ENOENT) - return 0; - return -errno; - } - - for (;;) { - int k; - char *p, *f; - - k = readdir_r(dir, &buffer, &de); - if (k != 0) { - r = -k; - goto finish; - } - - if (!de) - break; - - if (!dirent_is_file_with_suffix(de, suffix)) - continue; - - if (asprintf(&p, "%s/%s", path, de->d_name) < 0) { - r = -ENOMEM; - goto finish; - } - - f = canonicalize_file_name(p); - if (!f) { - log_error("Failed to canonicalize file name '%s': %m", p); - free(p); - continue; - } - free(p); - - log_debug("found: %s\n", f); - if (hashmap_put(h, file_name_from_path(f), f) <= 0) - free(f); - } - -finish: - closedir(dir); - return r; -} - -static int base_cmp(const void *a, const void *b) { - const char *s1, *s2; - - s1 = *(char * const *)a; - s2 = *(char * const *)b; - return strcmp(file_name_from_path(s1), file_name_from_path(s2)); -} - -int conf_files_list(char ***strv, const char *suffix, const char *dir, ...) { - Hashmap *fh = NULL; - char **dirs = NULL; - char **files = NULL; - char **p; - va_list ap; - int r = 0; - - va_start(ap, dir); - dirs = strv_new_ap(dir, ap); - va_end(ap); - if (!dirs) { - r = -ENOMEM; - goto finish; - } - if (!strv_path_canonicalize(dirs)) { - r = -ENOMEM; - goto finish; - } - if (!strv_uniq(dirs)) { - r = -ENOMEM; - goto finish; - } - - fh = hashmap_new(string_hash_func, string_compare_func); - if (!fh) { - r = -ENOMEM; - goto finish; - } - - STRV_FOREACH(p, dirs) { - if (files_add(fh, *p, suffix) < 0) { - log_error("Failed to search for files."); - r = -EINVAL; - goto finish; - } - } - - files = hashmap_get_strv(fh); - if (files == NULL) { - log_error("Failed to compose list of files."); - r = -ENOMEM; - goto finish; - } - - qsort(files, hashmap_size(fh), sizeof(char *), base_cmp); - -finish: - strv_free(dirs); - hashmap_free(fh); - *strv = files; - return r; -} - -int hwclock_is_localtime(void) { - FILE *f; - bool local = false; - - /* - * The third line of adjtime is "UTC" or "LOCAL" or nothing. - * # /etc/adjtime - * 0.0 0 0 - * 0 - * UTC - */ - f = fopen("/etc/adjtime", "re"); - if (f) { - char line[LINE_MAX]; - bool b; - - b = fgets(line, sizeof(line), f) && - fgets(line, sizeof(line), f) && - fgets(line, sizeof(line), f); - - fclose(f); - - if (!b) - return -EIO; - - - truncate_nl(line); - local = streq(line, "LOCAL"); - - } else if (errno != -ENOENT) - return -errno; - - return local; -} - -int hwclock_apply_localtime_delta(int *min) { - const struct timeval *tv_null = NULL; - struct timespec ts; - struct tm *tm; - int minuteswest; - struct timezone tz; - - assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0); - assert_se(tm = localtime(&ts.tv_sec)); - minuteswest = tm->tm_gmtoff / 60; - - tz.tz_minuteswest = -minuteswest; - tz.tz_dsttime = 0; /* DST_NONE*/ - - /* - * If the hardware clock does not run in UTC, but in local time: - * The very first time we set the kernel's timezone, it will warp - * the clock so that it runs in UTC instead of local time. - */ - if (settimeofday(tv_null, &tz) < 0) - return -errno; - if (min) - *min = minuteswest; - return 0; -} - -int hwclock_reset_localtime_delta(void) { - const struct timeval *tv_null = NULL; - struct timezone tz; - - tz.tz_minuteswest = 0; - tz.tz_dsttime = 0; /* DST_NONE*/ - - if (settimeofday(tv_null, &tz) < 0) - return -errno; - - return 0; -} - -int rtc_open(int flags) { - int fd; - DIR *d; - - /* First, we try to make use of the /dev/rtc symlink. If that - * doesn't exist, we open the first RTC which has hctosys=1 - * set. If we don't find any we just take the first RTC that - * exists at all. */ - - fd = open("/dev/rtc", flags); - if (fd >= 0) - return fd; - - d = opendir("/sys/class/rtc"); - if (!d) - goto fallback; - - for (;;) { - char *p, *v; - struct dirent buf, *de; - int r; - - r = readdir_r(d, &buf, &de); - if (r != 0) - goto fallback; - - if (!de) - goto fallback; - - if (ignore_file(de->d_name)) - continue; - - p = join("/sys/class/rtc/", de->d_name, "/hctosys", NULL); - if (!p) { - closedir(d); - return -ENOMEM; - } - - r = read_one_line_file(p, &v); - free(p); - - if (r < 0) - continue; - - r = parse_boolean(v); - free(v); - - if (r <= 0) - continue; - - p = strappend("/dev/", de->d_name); - fd = open(p, flags); - free(p); - - if (fd >= 0) { - closedir(d); - return fd; - } - } - -fallback: - if (d) - closedir(d); - - fd = open("/dev/rtc0", flags); - if (fd < 0) - return -errno; - - return fd; -} - -int hwclock_get_time(struct tm *tm) { - int fd; - int err = 0; - - assert(tm); - - fd = rtc_open(O_RDONLY|O_CLOEXEC); - if (fd < 0) - return -errno; - - /* This leaves the timezone fields of struct tm - * uninitialized! */ - if (ioctl(fd, RTC_RD_TIME, tm) < 0) - err = -errno; - - /* We don't now daylight saving, so we reset this in order not - * to confused mktime(). */ - tm->tm_isdst = -1; - - close_nointr_nofail(fd); - - return err; -} - -int hwclock_set_time(const struct tm *tm) { - int fd; - int err = 0; - - assert(tm); - - fd = rtc_open(O_RDONLY|O_CLOEXEC); - if (fd < 0) - return -errno; - - if (ioctl(fd, RTC_SET_TIME, tm) < 0) - err = -errno; - - close_nointr_nofail(fd); - - return err; -} - -int copy_file(const char *from, const char *to) { - int r, fdf, fdt; - - assert(from); - assert(to); - - fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY); - if (fdf < 0) - return -errno; - - fdt = open(to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY, 0644); - if (fdt < 0) { - close_nointr_nofail(fdf); - return -errno; - } - - for (;;) { - char buf[PIPE_BUF]; - ssize_t n, k; - - n = read(fdf, buf, sizeof(buf)); - if (n < 0) { - r = -errno; - - close_nointr_nofail(fdf); - close_nointr(fdt); - unlink(to); - - return r; - } - - if (n == 0) - break; - - errno = 0; - k = loop_write(fdt, buf, n, false); - if (n != k) { - r = k < 0 ? k : (errno ? -errno : -EIO); - - close_nointr_nofail(fdf); - close_nointr(fdt); - - unlink(to); - return r; - } - } - - close_nointr_nofail(fdf); - r = close_nointr(fdt); - - if (r < 0) { - unlink(to); - return r; - } - - return 0; -} - -int symlink_or_copy(const char *from, const char *to) { - char *pf = NULL, *pt = NULL; - struct stat a, b; - int r; - - assert(from); - assert(to); - - if (parent_of_path(from, &pf) < 0 || - parent_of_path(to, &pt) < 0) { - r = -ENOMEM; - goto finish; - } - - if (stat(pf, &a) < 0 || - stat(pt, &b) < 0) { - r = -errno; - goto finish; - } - - if (a.st_dev != b.st_dev) { - free(pf); - free(pt); - - return copy_file(from, to); - } - - if (symlink(from, to) < 0) { - r = -errno; - goto finish; - } - - r = 0; - -finish: - free(pf); - free(pt); - - return r; -} - -int symlink_or_copy_atomic(const char *from, const char *to) { - char *t, *x; - const char *fn; - size_t k; - unsigned long long ull; - unsigned i; - int r; - - assert(from); - assert(to); - - t = new(char, strlen(to) + 1 + 16 + 1); - if (!t) - return -ENOMEM; - - fn = file_name_from_path(to); - k = fn-to; - memcpy(t, to, k); - t[k] = '.'; - x = stpcpy(t+k+1, fn); - - ull = random_ull(); - for (i = 0; i < 16; i++) { - *(x++) = hexchar(ull & 0xF); - ull >>= 4; - } - - *x = 0; - - r = symlink_or_copy(from, t); - if (r < 0) { - unlink(t); - free(t); - return r; - } - - if (rename(t, to) < 0) { - r = -errno; - unlink(t); - free(t); - return r; - } - - free(t); - return r; -} - -int audit_session_from_pid(pid_t pid, uint32_t *id) { - char *s; - uint32_t u; - int r; - - assert(id); - - if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0) - return -ENOENT; - - if (pid == 0) - r = read_one_line_file("/proc/self/sessionid", &s); - else { - char *p; - - if (asprintf(&p, "/proc/%lu/sessionid", (unsigned long) pid) < 0) - return -ENOMEM; - - r = read_one_line_file(p, &s); - free(p); - } - - if (r < 0) - return r; - - r = safe_atou32(s, &u); - free(s); - - if (r < 0) - return r; - - if (u == (uint32_t) -1 || u <= 0) - return -ENOENT; - - *id = u; - return 0; -} - -int audit_loginuid_from_pid(pid_t pid, uid_t *uid) { - char *s; - uid_t u; - int r; - - assert(uid); - - /* Only use audit login uid if we are executed with sufficient - * capabilities so that pam_loginuid could do its job. If we - * are lacking the CAP_AUDIT_CONTROL capabality we most likely - * are being run in a container and /proc/self/loginuid is - * useless since it probably contains a uid of the host - * system. */ - - if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0) - return -ENOENT; - - if (pid == 0) - r = read_one_line_file("/proc/self/loginuid", &s); - else { - char *p; - - if (asprintf(&p, "/proc/%lu/loginuid", (unsigned long) pid) < 0) - return -ENOMEM; - - r = read_one_line_file(p, &s); - free(p); - } - - if (r < 0) - return r; - - r = parse_uid(s, &u); - free(s); - - if (r < 0) - return r; - - if (u == (uid_t) -1) - return -ENOENT; - - *uid = (uid_t) u; - return 0; -} - -bool display_is_local(const char *display) { - assert(display); - - return - display[0] == ':' && - display[1] >= '0' && - display[1] <= '9'; -} - -int socket_from_display(const char *display, char **path) { - size_t k; - char *f, *c; - - assert(display); - assert(path); - - if (!display_is_local(display)) - return -EINVAL; - - k = strspn(display+1, "0123456789"); - - f = new(char, sizeof("/tmp/.X11-unix/X") + k); - if (!f) - return -ENOMEM; - - c = stpcpy(f, "/tmp/.X11-unix/X"); - memcpy(c, display+1, k); - c[k] = 0; - - *path = f; - - return 0; -} - -int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) { - struct passwd *p; - uid_t u; - - assert(username); - assert(*username); - - /* We enforce some special rules for uid=0: in order to avoid - * NSS lookups for root we hardcode its data. */ - - if (streq(*username, "root") || streq(*username, "0")) { - *username = "root"; - - if (uid) - *uid = 0; - - if (gid) - *gid = 0; - - if (home) - *home = "/root"; - return 0; - } - - if (parse_uid(*username, &u) >= 0) { - errno = 0; - p = getpwuid(u); - - /* If there are multiple users with the same id, make - * sure to leave $USER to the configured value instead - * of the first occurrence in the database. However if - * the uid was configured by a numeric uid, then let's - * pick the real username from /etc/passwd. */ - if (p) - *username = p->pw_name; - } else { - errno = 0; - p = getpwnam(*username); - } - - if (!p) - return errno != 0 ? -errno : -ESRCH; - - if (uid) - *uid = p->pw_uid; - - if (gid) - *gid = p->pw_gid; - - if (home) - *home = p->pw_dir; - - return 0; -} - -int get_group_creds(const char **groupname, gid_t *gid) { - struct group *g; - gid_t id; - - assert(groupname); - - /* We enforce some special rules for gid=0: in order to avoid - * NSS lookups for root we hardcode its data. */ - - if (streq(*groupname, "root") || streq(*groupname, "0")) { - *groupname = "root"; - - if (gid) - *gid = 0; - - return 0; - } - - if (parse_gid(*groupname, &id) >= 0) { - errno = 0; - g = getgrgid(id); - - if (g) - *groupname = g->gr_name; - } else { - errno = 0; - g = getgrnam(*groupname); - } - - if (!g) - return errno != 0 ? -errno : -ESRCH; - - if (gid) - *gid = g->gr_gid; - - return 0; -} - -int in_group(const char *name) { - gid_t gid, *gids; - int ngroups_max, r, i; - - r = get_group_creds(&name, &gid); - if (r < 0) - return r; - - if (getgid() == gid) - return 1; - - if (getegid() == gid) - return 1; - - ngroups_max = sysconf(_SC_NGROUPS_MAX); - assert(ngroups_max > 0); - - gids = alloca(sizeof(gid_t) * ngroups_max); - - r = getgroups(ngroups_max, gids); - if (r < 0) - return -errno; - - for (i = 0; i < r; i++) - if (gids[i] == gid) - return 1; - - return 0; -} - -int glob_exists(const char *path) { - glob_t g; - int r, k; - - assert(path); - - zero(g); - errno = 0; - k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g); - - if (k == GLOB_NOMATCH) - r = 0; - else if (k == GLOB_NOSPACE) - r = -ENOMEM; - else if (k == 0) - r = !strv_isempty(g.gl_pathv); - else - r = errno ? -errno : -EIO; - - globfree(&g); - - return r; -} - -int dirent_ensure_type(DIR *d, struct dirent *de) { - struct stat st; - - assert(d); - assert(de); - - if (de->d_type != DT_UNKNOWN) - return 0; - - if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) - return -errno; - - de->d_type = - S_ISREG(st.st_mode) ? DT_REG : - S_ISDIR(st.st_mode) ? DT_DIR : - S_ISLNK(st.st_mode) ? DT_LNK : - S_ISFIFO(st.st_mode) ? DT_FIFO : - S_ISSOCK(st.st_mode) ? DT_SOCK : - S_ISCHR(st.st_mode) ? DT_CHR : - S_ISBLK(st.st_mode) ? DT_BLK : - DT_UNKNOWN; - - return 0; -} - -int in_search_path(const char *path, char **search) { - char **i, *parent; - int r; - - r = parent_of_path(path, &parent); - if (r < 0) - return r; - - r = 0; - - STRV_FOREACH(i, search) { - if (path_equal(parent, *i)) { - r = 1; - break; - } - } - - free(parent); - - return r; -} - -int get_files_in_directory(const char *path, char ***list) { - DIR *d; - int r = 0; - unsigned n = 0; - char **l = NULL; - - assert(path); - - /* Returns all files in a directory in *list, and the number - * of files as return value. If list is NULL returns only the - * number */ - - d = opendir(path); - if (!d) - return -errno; - - for (;;) { - struct dirent buffer, *de; - int k; - - k = readdir_r(d, &buffer, &de); - if (k != 0) { - r = -k; - goto finish; - } - - if (!de) - break; - - dirent_ensure_type(d, de); - - if (!dirent_is_file(de)) - continue; - - if (list) { - if ((unsigned) r >= n) { - char **t; - - n = MAX(16, 2*r); - t = realloc(l, sizeof(char*) * n); - if (!t) { - r = -ENOMEM; - goto finish; - } - - l = t; - } - - assert((unsigned) r < n); - - l[r] = strdup(de->d_name); - if (!l[r]) { - r = -ENOMEM; - goto finish; - } - - l[++r] = NULL; - } else - r++; - } - -finish: - if (d) - closedir(d); - - if (r >= 0) { - if (list) - *list = l; - } else - strv_free(l); - - return r; -} - -char *join(const char *x, ...) { - va_list ap; - size_t l; - char *r, *p; - - va_start(ap, x); - - if (x) { - l = strlen(x); - - for (;;) { - const char *t; - - t = va_arg(ap, const char *); - if (!t) - break; - - l += strlen(t); - } - } else - l = 0; - - va_end(ap); - - r = new(char, l+1); - if (!r) - return NULL; - - if (x) { - p = stpcpy(r, x); - - va_start(ap, x); - - for (;;) { - const char *t; - - t = va_arg(ap, const char *); - if (!t) - break; - - p = stpcpy(p, t); - } - - va_end(ap); - } else - r[0] = 0; - - return r; -} - -bool is_main_thread(void) { - static __thread int cached = 0; - - if (_unlikely_(cached == 0)) - cached = getpid() == gettid() ? 1 : -1; - - return cached > 0; -} - -int block_get_whole_disk(dev_t d, dev_t *ret) { - char *p, *s; - int r; - unsigned n, m; - - assert(ret); - - /* If it has a queue this is good enough for us */ - if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0) - return -ENOMEM; - - r = access(p, F_OK); - free(p); - - if (r >= 0) { - *ret = d; - return 0; - } - - /* If it is a partition find the originating device */ - if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0) - return -ENOMEM; - - r = access(p, F_OK); - free(p); - - if (r < 0) - return -ENOENT; - - /* Get parent dev_t */ - if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0) - return -ENOMEM; - - r = read_one_line_file(p, &s); - free(p); - - if (r < 0) - return r; - - r = sscanf(s, "%u:%u", &m, &n); - free(s); - - if (r != 2) - return -EINVAL; - - /* Only return this if it is really good enough for us. */ - if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0) - return -ENOMEM; - - r = access(p, F_OK); - free(p); - - if (r >= 0) { - *ret = makedev(m, n); - return 0; - } - - return -ENOENT; -} - -int file_is_priv_sticky(const char *p) { - struct stat st; - - assert(p); - - if (lstat(p, &st) < 0) - return -errno; - - return - (st.st_uid == 0 || st.st_uid == getuid()) && - (st.st_mode & S_ISVTX); -} - -static const char *const ioprio_class_table[] = { - [IOPRIO_CLASS_NONE] = "none", - [IOPRIO_CLASS_RT] = "realtime", - [IOPRIO_CLASS_BE] = "best-effort", - [IOPRIO_CLASS_IDLE] = "idle" -}; - -DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int); - -static const char *const sigchld_code_table[] = { - [CLD_EXITED] = "exited", - [CLD_KILLED] = "killed", - [CLD_DUMPED] = "dumped", - [CLD_TRAPPED] = "trapped", - [CLD_STOPPED] = "stopped", - [CLD_CONTINUED] = "continued", -}; - -DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int); - -static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = { - [LOG_FAC(LOG_KERN)] = "kern", - [LOG_FAC(LOG_USER)] = "user", - [LOG_FAC(LOG_MAIL)] = "mail", - [LOG_FAC(LOG_DAEMON)] = "daemon", - [LOG_FAC(LOG_AUTH)] = "auth", - [LOG_FAC(LOG_SYSLOG)] = "syslog", - [LOG_FAC(LOG_LPR)] = "lpr", - [LOG_FAC(LOG_NEWS)] = "news", - [LOG_FAC(LOG_UUCP)] = "uucp", - [LOG_FAC(LOG_CRON)] = "cron", - [LOG_FAC(LOG_AUTHPRIV)] = "authpriv", - [LOG_FAC(LOG_FTP)] = "ftp", - [LOG_FAC(LOG_LOCAL0)] = "local0", - [LOG_FAC(LOG_LOCAL1)] = "local1", - [LOG_FAC(LOG_LOCAL2)] = "local2", - [LOG_FAC(LOG_LOCAL3)] = "local3", - [LOG_FAC(LOG_LOCAL4)] = "local4", - [LOG_FAC(LOG_LOCAL5)] = "local5", - [LOG_FAC(LOG_LOCAL6)] = "local6", - [LOG_FAC(LOG_LOCAL7)] = "local7" -}; - -DEFINE_STRING_TABLE_LOOKUP(log_facility_unshifted, int); - -static const char *const log_level_table[] = { - [LOG_EMERG] = "emerg", - [LOG_ALERT] = "alert", - [LOG_CRIT] = "crit", - [LOG_ERR] = "err", - [LOG_WARNING] = "warning", - [LOG_NOTICE] = "notice", - [LOG_INFO] = "info", - [LOG_DEBUG] = "debug" -}; - -DEFINE_STRING_TABLE_LOOKUP(log_level, int); - -static const char* const sched_policy_table[] = { - [SCHED_OTHER] = "other", - [SCHED_BATCH] = "batch", - [SCHED_IDLE] = "idle", - [SCHED_FIFO] = "fifo", - [SCHED_RR] = "rr" -}; - -DEFINE_STRING_TABLE_LOOKUP(sched_policy, int); - -static const char* const rlimit_table[] = { - [RLIMIT_CPU] = "LimitCPU", - [RLIMIT_FSIZE] = "LimitFSIZE", - [RLIMIT_DATA] = "LimitDATA", - [RLIMIT_STACK] = "LimitSTACK", - [RLIMIT_CORE] = "LimitCORE", - [RLIMIT_RSS] = "LimitRSS", - [RLIMIT_NOFILE] = "LimitNOFILE", - [RLIMIT_AS] = "LimitAS", - [RLIMIT_NPROC] = "LimitNPROC", - [RLIMIT_MEMLOCK] = "LimitMEMLOCK", - [RLIMIT_LOCKS] = "LimitLOCKS", - [RLIMIT_SIGPENDING] = "LimitSIGPENDING", - [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE", - [RLIMIT_NICE] = "LimitNICE", - [RLIMIT_RTPRIO] = "LimitRTPRIO", - [RLIMIT_RTTIME] = "LimitRTTIME" -}; - -DEFINE_STRING_TABLE_LOOKUP(rlimit, int); - -static const char* const ip_tos_table[] = { - [IPTOS_LOWDELAY] = "low-delay", - [IPTOS_THROUGHPUT] = "throughput", - [IPTOS_RELIABILITY] = "reliability", - [IPTOS_LOWCOST] = "low-cost", -}; - -DEFINE_STRING_TABLE_LOOKUP(ip_tos, int); - -static const char *const __signal_table[] = { - [SIGHUP] = "HUP", - [SIGINT] = "INT", - [SIGQUIT] = "QUIT", - [SIGILL] = "ILL", - [SIGTRAP] = "TRAP", - [SIGABRT] = "ABRT", - [SIGBUS] = "BUS", - [SIGFPE] = "FPE", - [SIGKILL] = "KILL", - [SIGUSR1] = "USR1", - [SIGSEGV] = "SEGV", - [SIGUSR2] = "USR2", - [SIGPIPE] = "PIPE", - [SIGALRM] = "ALRM", - [SIGTERM] = "TERM", -#ifdef SIGSTKFLT - [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */ -#endif - [SIGCHLD] = "CHLD", - [SIGCONT] = "CONT", - [SIGSTOP] = "STOP", - [SIGTSTP] = "TSTP", - [SIGTTIN] = "TTIN", - [SIGTTOU] = "TTOU", - [SIGURG] = "URG", - [SIGXCPU] = "XCPU", - [SIGXFSZ] = "XFSZ", - [SIGVTALRM] = "VTALRM", - [SIGPROF] = "PROF", - [SIGWINCH] = "WINCH", - [SIGIO] = "IO", - [SIGPWR] = "PWR", - [SIGSYS] = "SYS" -}; - -DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int); - -const char *signal_to_string(int signo) { - static __thread char buf[12]; - const char *name; - - name = __signal_to_string(signo); - if (name) - return name; - - if (signo >= SIGRTMIN && signo <= SIGRTMAX) - snprintf(buf, sizeof(buf) - 1, "RTMIN+%d", signo - SIGRTMIN); - else - snprintf(buf, sizeof(buf) - 1, "%d", signo); - char_array_0(buf); - return buf; -} - -int signal_from_string(const char *s) { - int signo; - int offset = 0; - unsigned u; - - signo =__signal_from_string(s); - if (signo > 0) - return signo; - - if (startswith(s, "RTMIN+")) { - s += 6; - offset = SIGRTMIN; - } - if (safe_atou(s, &u) >= 0) { - signo = (int) u + offset; - if (signo > 0 && signo < _NSIG) - return signo; - } - return -1; -} - -bool kexec_loaded(void) { - bool loaded = false; - char *s; - - if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) { - if (s[0] == '1') - loaded = true; - free(s); - } - return loaded; -} - -int strdup_or_null(const char *a, char **b) { - char *c; - - assert(b); - - if (!a) { - *b = NULL; - return 0; - } - - c = strdup(a); - if (!c) - return -ENOMEM; - - *b = c; - return 0; -} - -int prot_from_flags(int flags) { - - switch (flags & O_ACCMODE) { - - case O_RDONLY: - return PROT_READ; - - case O_WRONLY: - return PROT_WRITE; - - case O_RDWR: - return PROT_READ|PROT_WRITE; - - default: - return -EINVAL; - } -} - -unsigned long cap_last_cap(void) { - static __thread unsigned long saved; - static __thread bool valid = false; - unsigned long p; - - if (valid) - return saved; - - p = (unsigned long) CAP_LAST_CAP; - - if (prctl(PR_CAPBSET_READ, p) < 0) { - - /* Hmm, look downwards, until we find one that - * works */ - for (p--; p > 0; p --) - if (prctl(PR_CAPBSET_READ, p) >= 0) - break; - - } else { - - /* Hmm, look upwards, until we find one that doesn't - * work */ - for (;; p++) - if (prctl(PR_CAPBSET_READ, p+1) < 0) - break; - } - - saved = p; - valid = true; - - return p; -} - -char *format_bytes(char *buf, size_t l, off_t t) { - unsigned i; - - static const struct { - const char *suffix; - off_t factor; - } table[] = { - { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL }, - { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL }, - { "T", 1024ULL*1024ULL*1024ULL*1024ULL }, - { "G", 1024ULL*1024ULL*1024ULL }, - { "M", 1024ULL*1024ULL }, - { "K", 1024ULL }, - }; - - for (i = 0; i < ELEMENTSOF(table); i++) { - - if (t >= table[i].factor) { - snprintf(buf, l, - "%llu.%llu%s", - (unsigned long long) (t / table[i].factor), - (unsigned long long) (((t*10ULL) / table[i].factor) % 10ULL), - table[i].suffix); - - goto finish; - } - } - - snprintf(buf, l, "%lluB", (unsigned long long) t); - -finish: - buf[l-1] = 0; - return buf; - -} - -void* memdup(const void *p, size_t l) { - void *r; - - assert(p); - - r = malloc(l); - if (!r) - return NULL; - - memcpy(r, p, l); - return r; -} - -int fd_inc_sndbuf(int fd, size_t n) { - int r, value; - socklen_t l = sizeof(value); - - r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); - if (r >= 0 && - l == sizeof(value) && - (size_t) value >= n*2) - return 0; - - value = (int) n; - r = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)); - if (r < 0) - return -errno; - - return 1; -} - -int fd_inc_rcvbuf(int fd, size_t n) { - int r, value; - socklen_t l = sizeof(value); - - r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); - if (r >= 0 && - l == sizeof(value) && - (size_t) value >= n*2) - return 0; - - value = (int) n; - r = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)); - if (r < 0) - return -errno; - - return 1; -}