#include <fcntl.h>
#include <dirent.h>
#include <sys/ioctl.h>
-#include <linux/vt.h>
-#include <linux/tiocl.h>
-#include <termios.h>
#include <stdarg.h>
#include <poll.h>
#include <ctype.h>
#include <sys/utsname.h>
#include <pwd.h>
#include <netinet/ip.h>
-#include <linux/kd.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <glob.h>
#include "formats-util.h"
#include "process-util.h"
#include "random-util.h"
+#include "terminal-util.h"
/* Put this test here for a lack of better place */
assert_cc(EAGAIN == EWOULDBLOCK);
int saved_argc = 0;
char **saved_argv = NULL;
-static volatile unsigned cached_columns = 0;
-static volatile unsigned cached_lines = 0;
-
size_t page_size(void) {
static thread_local size_t pgsz = 0;
long r;
int r;
assert(s);
- assert(ret_uid);
r = safe_atolu(s, &ul);
if (r < 0)
if (uid == (uid_t) 0xFFFF)
return -ENXIO;
- *ret_uid = uid;
+ if (ret_uid)
+ *ret_uid = uid;
+
return 0;
}
return nulstr_contains(table, fstype);
}
-int chvt(int vt) {
- _cleanup_close_ int fd;
-
- fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- return -errno;
-
- if (vt < 0) {
- int tiocl[2] = {
- TIOCL_GETKMSGREDIRECT,
- 0
- };
-
- if (ioctl(fd, TIOCLINUX, tiocl) < 0)
- return -errno;
-
- vt = tiocl[0] <= 0 ? 1 : tiocl[0];
- }
-
- if (ioctl(fd, VT_ACTIVATE, vt) < 0)
- return -errno;
-
- return 0;
-}
-
-int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
- struct termios old_termios, new_termios;
- char c, 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_INFINITY) {
- 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_INFINITY) {
- if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
- return -ETIMEDOUT;
- }
-
- errno = 0;
- if (!fgets(line, sizeof(line), f))
- return errno ? -errno : -EIO;
-
- truncate_nl(line);
-
- if (strlen(line) != 1)
- return -EBADMSG;
-
- if (need_nl)
- *need_nl = false;
-
- *ret = line[0];
- return 0;
-}
-
-int ask_char(char *ret, const char *replies, const char *text, ...) {
- int r;
-
- assert(ret);
- assert(replies);
- assert(text);
-
- for (;;) {
- va_list ap;
- char c;
- 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_INFINITY, &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 ask_string(char **ret, const char *text, ...) {
- assert(ret);
- assert(text);
-
- for (;;) {
- char line[LINE_MAX];
- va_list ap;
-
- 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);
-
- errno = 0;
- if (!fgets(line, sizeof(line), stdin))
- return errno ? -errno : -EIO;
-
- if (!endswith(line, "\n"))
- putchar('\n');
- else {
- char *s;
-
- if (isempty(line))
- continue;
-
- truncate_nl(line);
- s = strdup(line);
- if (!s)
- return -ENOMEM;
-
- *ret = s;
- return 0;
- }
- }
-}
-
-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) {
- _cleanup_close_ int fd = -1;
-
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- return fd;
-
- return reset_terminal_fd(fd, true);
-}
-
-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
- */
-
- assert(!(mode & O_CREAT));
-
- for (;;) {
- fd = open(name, mode, 0);
- if (fd >= 0)
- break;
-
- if (errno != EIO)
- return -errno;
-
- /* Max 1s in total */
- if (c >= 20)
- return -errno;
-
- usleep(50 * USEC_PER_MSEC);
- c++;
- }
-
- r = isatty(fd);
- if (r < 0) {
- safe_close(fd);
- return -errno;
- }
-
- if (!r) {
- safe_close(fd);
- return -ENOTTY;
- }
-
- return fd;
-}
-
int flush_fd(int fd) {
struct pollfd pollfd = {
.fd = fd,
}
}
-int acquire_terminal(
- const char *name,
- bool fail,
- bool force,
- bool ignore_tiocstty_eperm,
- usec_t timeout) {
-
- int fd = -1, notify = -1, r = 0, wd = -1;
- usec_t ts = 0;
-
- 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 (timeout != USEC_INFINITY)
- ts = now(CLOCK_MONOTONIC);
-
- if (!fail && !force) {
- notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
- if (notify < 0) {
- r = -errno;
- goto fail;
- }
-
- wd = inotify_add_watch(notify, name, IN_CLOSE);
- if (wd < 0) {
- r = -errno;
- goto fail;
- }
- }
-
- for (;;) {
- struct sigaction sa_old, sa_new = {
- .sa_handler = SIG_IGN,
- .sa_flags = SA_RESTART,
- };
-
- if (notify >= 0) {
- r = flush_fd(notify);
- if (r < 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 */
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- return fd;
-
- /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
- * if we already own the tty. */
- assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
-
- /* First, try to get the tty */
- if (ioctl(fd, TIOCSCTTY, force) < 0)
- r = -errno;
-
- assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
-
- /* Sometimes it makes sense to ignore TIOCSCTTY
- * returning EPERM, i.e. when very likely we already
- * are have this controlling terminal. */
- if (r < 0 && r == -EPERM && ignore_tiocstty_eperm)
- r = 0;
-
- if (r < 0 && (force || fail || r != -EPERM)) {
- goto fail;
- }
-
- if (r >= 0)
- break;
-
- assert(!fail);
- assert(!force);
- assert(notify >= 0);
-
- for (;;) {
- union inotify_event_buffer buffer;
- struct inotify_event *e;
- ssize_t l;
-
- if (timeout != USEC_INFINITY) {
- usec_t n;
-
- n = now(CLOCK_MONOTONIC);
- if (ts + timeout < n) {
- r = -ETIMEDOUT;
- goto fail;
- }
-
- r = fd_wait_for_event(fd, POLLIN, ts + timeout - n);
- if (r < 0)
- goto fail;
-
- if (r == 0) {
- r = -ETIMEDOUT;
- goto fail;
- }
- }
-
- l = read(notify, &buffer, sizeof(buffer));
- if (l < 0) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
-
- r = -errno;
- goto fail;
- }
-
- FOREACH_INOTIFY_EVENT(e, buffer, l) {
- if (e->wd != wd || !(e->mask & IN_CLOSE)) {
- r = -EIO;
- goto fail;
- }
- }
-
- 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. */
- fd = safe_close(fd);
- }
-
- safe_close(notify);
-
- r = reset_terminal_fd(fd, true);
- if (r < 0)
- log_warning_errno(r, "Failed to reset terminal: %m");
-
- return fd;
-
-fail:
- safe_close(fd);
- safe_close(notify);
-
- return r;
-}
-
-int release_terminal(void) {
- static const struct sigaction sa_new = {
- .sa_handler = SIG_IGN,
- .sa_flags = SA_RESTART,
- };
-
- _cleanup_close_ int fd = -1;
- struct sigaction sa_old;
- int r = 0;
-
- fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
- if (fd < 0)
- return -errno;
-
- /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
- * by our own TIOCNOTTY */
- assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
-
- if (ioctl(fd, TIOCNOTTY) < 0)
- r = -errno;
-
- assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
-
- return r;
-}
-
int sigaction_many(const struct sigaction *sa, ...) {
va_list ap;
int r = 0, sig;
errno = 0;
- while (nbytes > 0) {
+ do {
ssize_t k;
k = write(fd, p, nbytes);
return -errno;
}
- if (k == 0) /* Can't really happen */
+ if (nbytes > 0 && k == 0) /* Can't really happen */
return -EIO;
p += k;
nbytes -= k;
- }
+ } while (nbytes > 0);
return 0;
}
* sometimes SI decimal suffixes. This function can parse
* both. Which one is the right way depends on the
* context. Wikipedia suggests that SI is customary for
- * hardrware metrics and network speeds, while IEC is
+ * hardware metrics and network speeds, while IEC is
* customary for most data sizes used by software and volatile
* (RAM) memory. Hence be careful which one you pick!
*
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)
- safe_close(fd);
-
- if (r < 0 || s < 0 || t < 0)
- return -errno;
-
- /* Explicitly unset O_CLOEXEC, since if fd was < 3, then
- * dup2() was a NOP and the bit hence possibly set. */
- 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;
-
- null_fd = open("/dev/null", O_RDWR|O_NOCTTY);
- if (null_fd < 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
return lookup_uid(getuid());
}
-int getttyname_malloc(int fd, char **ret) {
- size_t l = 100;
- int r;
-
- assert(fd >= 0);
- assert(ret);
-
- for (;;) {
- char path[l];
-
- r = ttyname_r(fd, path, sizeof(path));
- if (r == 0) {
- const char *p;
- char *c;
-
- p = startswith(path, "/dev/");
- c = strdup(p ?: path);
- if (!c)
- return -ENOMEM;
-
- *ret = c;
- return 0;
- }
-
- if (r != ERANGE)
- return -r;
-
- l *= 2;
- }
-
- return 0;
-}
-
-int getttyname_harder(int fd, char **r) {
- int k;
- char *s = NULL;
-
- k = getttyname_malloc(fd, &s);
- if (k < 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 r;
- _cleanup_free_ char *line = NULL;
- const char *p;
- unsigned long ttynr;
-
- assert(pid >= 0);
-
- p = procfs_file_alloca(pid, "stat");
- r = read_one_line_file(p, &line);
- if (r < 0)
- return r;
-
- 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;
-
- if (major(ttynr) == 0 && minor(ttynr) == 0)
- return -ENOENT;
-
- if (d)
- *d = (dev_t) ttynr;
-
- return 0;
-}
-
-int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
- char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
- _cleanup_free_ char *s = NULL;
- const char *p;
- dev_t devnr;
- int k;
-
- assert(r);
-
- k = get_ctty_devnr(pid, &devnr);
- if (k < 0)
- return k;
-
- sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr));
-
- k = readlink_malloc(fn, &s);
- if (k < 0) {
-
- if (k != -ENOENT)
- return k;
-
- /* This is an ugly hack */
- if (major(devnr) == 136) {
- if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
- return -ENOMEM;
- } else {
- /* Probably something like the ptys which have no
- * symlink in /dev/char. Let's return something
- * vaguely useful. */
-
- b = strdup(fn + 5);
- if (!b)
- return -ENOMEM;
- }
- } else {
- if (startswith(s, "/dev/"))
- p = s + 5;
- else if (startswith(s, "../"))
- p = s + 3;
- else
- p = s;
-
- b = strdup(p);
- if (!b)
- return -ENOMEM;
- }
-
- *r = b;
- if (_devnr)
- *_devnr = devnr;
-
- return 0;
-}
-
bool is_temporary_fs(const struct statfs *s) {
assert(s);
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 (mode != MODE_INVALID)
- if (fchmod(fd, mode) < 0)
- return -errno;
-
- if (uid != UID_INVALID || gid != GID_INVALID)
- 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;
- }
-}
-
-int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
- static const char status_indent[] = " "; /* "[" STATUS "] " */
- _cleanup_free_ char *s = NULL;
- _cleanup_close_ int fd = -1;
- struct iovec iovec[6] = {};
- int n = 0;
- static bool prev_ephemeral;
-
- assert(format);
-
- /* This is independent of logging, as status messages are
- * optional and go exclusively to the console. */
-
- if (vasprintf(&s, format, ap) < 0)
- return log_oom();
-
- fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- return fd;
-
- if (ellipse) {
- char *e;
- size_t emax, sl;
- int c;
-
- c = fd_columns(fd);
- if (c <= 0)
- c = 80;
-
- sl = status ? sizeof(status_indent)-1 : 0;
-
- emax = c - sl - 1;
- if (emax < 3)
- emax = 3;
-
- e = ellipsize(s, emax, 50);
- if (e) {
- free(s);
- s = e;
- }
- }
-
- if (prev_ephemeral)
- IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
- prev_ephemeral = ephemeral;
-
- if (status) {
- if (!isempty(status)) {
- IOVEC_SET_STRING(iovec[n++], "[");
- IOVEC_SET_STRING(iovec[n++], status);
- IOVEC_SET_STRING(iovec[n++], "] ");
- } else
- IOVEC_SET_STRING(iovec[n++], status_indent);
- }
-
- IOVEC_SET_STRING(iovec[n++], s);
- if (!ephemeral)
- IOVEC_SET_STRING(iovec[n++], "\n");
-
- if (writev(fd, iovec, n) < 0)
- return -errno;
-
- return 0;
-}
-
-int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
- va_list ap;
- int r;
-
- assert(format);
-
- va_start(ap, format);
- r = status_vprintf(status, ellipse, ephemeral, format, ap);
- va_end(ap);
-
- return r;
-}
-
-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 == '$')
- state = CURLY;
- break;
-
- case CURLY:
- if (*e == '{') {
- k = strnappend(r, word, e-word-1);
- if (!k)
- goto fail;
-
- free(r);
- r = k;
-
- word = e-1;
- state = VARIABLE;
-
- } else if (*e == '$') {
- k = strnappend(r, word, e-word);
- if (!k)
- goto fail;
-
- free(r);
- r = k;
-
- word = e+1;
- state = WORD;
- } else
- state = WORD;
- break;
-
- case VARIABLE:
- if (*e == '}') {
- const char *t;
-
- t = strempty(strv_env_get_n(env, word+2, e-word-2));
-
- k = strappend(r, t);
- if (!k)
- goto fail;
-
- free(r);
- r = k;
-
- word = e+1;
- state = WORD;
- }
- break;
- }
- }
-
- k = strnappend(r, word, e-word);
- if (!k)
- goto fail;
-
- free(r);
- return k;
-
-fail:
- free(r);
- return NULL;
-}
-
-char **replace_env_argv(char **argv, char **env) {
- char **ret, **i;
- unsigned k = 0, l = 0;
-
- l = strv_length(argv);
-
- ret = new(char*, l+1);
- if (!ret)
- 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 = NULL;
- unsigned q;
-
- e = strv_env_get(env, *i+1);
- if (e) {
- int r;
-
- r = strv_split_quoted(&m, e, UNQUOTE_RELAX);
- if (r < 0) {
- ret[k] = NULL;
- strv_free(ret);
- return NULL;
- }
- } else
- m = NULL;
-
- q = strv_length(m);
- l = l + q - 1;
-
- w = realloc(ret, sizeof(char*) * (l+1));
- if (!w) {
- ret[k] = NULL;
- strv_free(ret);
- strv_free(m);
- return NULL;
- }
-
- ret = w;
- if (m) {
- memcpy(ret + 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 */
- ret[k] = replace_env(*i, env);
- if (!ret[k]) {
- strv_free(ret);
- return NULL;
- }
- k++;
- }
-
- ret[k] = NULL;
- return ret;
-}
-
-int fd_columns(int fd) {
- struct winsize ws = {};
-
- if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
- return -errno;
-
- if (ws.ws_col <= 0)
- return -EIO;
-
- return ws.ws_col;
-}
-
-unsigned columns(void) {
- const char *e;
- int c;
-
- if (_likely_(cached_columns > 0))
- return cached_columns;
-
- c = 0;
- e = getenv("COLUMNS");
- if (e)
- (void) safe_atoi(e, &c);
-
- if (c <= 0)
- c = fd_columns(STDOUT_FILENO);
-
- if (c <= 0)
- c = 80;
-
- cached_columns = c;
- return cached_columns;
-}
-
-int fd_lines(int fd) {
- struct winsize ws = {};
+int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
+ assert(fd >= 0);
- if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
- return -errno;
+ /* 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 (ws.ws_row <= 0)
- return -EIO;
+ if (mode != MODE_INVALID)
+ if (fchmod(fd, mode) < 0)
+ return -errno;
- return ws.ws_row;
-}
+ if (uid != UID_INVALID || gid != GID_INVALID)
+ if (fchown(fd, uid, gid) < 0)
+ return -errno;
-unsigned lines(void) {
- const char *e;
- int l;
+ return 0;
+}
- if (_likely_(cached_lines > 0))
- return cached_lines;
+cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
+ cpu_set_t *r;
+ unsigned n = 1024;
- l = 0;
- e = getenv("LINES");
- if (e)
- (void) safe_atoi(e, &l);
+ /* Allocates the cpuset in the right size */
- if (l <= 0)
- l = fd_lines(STDOUT_FILENO);
+ for (;;) {
+ if (!(r = CPU_ALLOC(n)))
+ return NULL;
- if (l <= 0)
- l = 24;
+ if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
+ CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
- cached_lines = l;
- return cached_lines;
-}
+ if (ncpus)
+ *ncpus = n;
-/* intended to be used as a SIGWINCH sighandler */
-void columns_lines_cache_reset(int signum) {
- cached_columns = 0;
- cached_lines = 0;
-}
+ return r;
+ }
-bool on_tty(void) {
- static int cached_on_tty = -1;
+ CPU_FREE(r);
- if (_unlikely_(cached_on_tty < 0))
- cached_on_tty = isatty(STDOUT_FILENO) > 0;
+ if (errno != EINVAL)
+ return NULL;
- return cached_on_tty;
+ n *= 2;
+ }
}
int files_same(const char *filea, const char *fileb) {
return strdup(p);
}
-bool tty_is_vc(const char *tty) {
- assert(tty);
-
- return vtnr_from_tty(tty) >= 0;
-}
-
-bool tty_is_console(const char *tty) {
- assert(tty);
-
- if (startswith(tty, "/dev/"))
- tty += 5;
-
- return streq(tty, "console");
-}
-
-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;
-}
-
-char *resolve_dev_console(char **active) {
- char *tty;
-
- /* Resolve where /dev/console is pointing to, if /sys is actually ours
- * (i.e. not read-only-mounted which is a sign for container setups) */
-
- if (path_is_read_only_fs("/sys") > 0)
- return NULL;
-
- if (read_one_line_file("/sys/class/tty/console/active", active) < 0)
- return NULL;
-
- /* If multiple log outputs are configured the last one is what
- * /dev/console points to */
- tty = strrchr(*active, ' ');
- if (tty)
- tty++;
- else
- tty = *active;
-
- if (streq(tty, "tty0")) {
- char *tmp;
-
- /* Get the active VC (e.g. tty1) */
- if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) {
- free(*active);
- tty = *active = tmp;
- }
- }
-
- return tty;
-}
-
-bool tty_is_vc_resolve(const char *tty) {
- _cleanup_free_ char *active = NULL;
-
- assert(tty);
-
- if (startswith(tty, "/dev/"))
- tty += 5;
-
- if (streq(tty, "console")) {
- tty = resolve_dev_console(&active);
- if (!tty)
- return false;
- }
-
- return tty_is_vc(tty);
-}
-
-const char *default_term_for_tty(const char *tty) {
- assert(tty);
-
- return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt220";
-}
-
bool dirent_is_file(const struct dirent *de) {
assert(de);
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) {
- _cleanup_close_ int fd;
-
- fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
- if (fd < 0)
- return fd;
-
- return terminal_vhangup_fd(fd);
-}
-
-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);
- safe_close(fd);
-
- return 0;
- }
+int symlink_atomic(const char *from, const char *to) {
+ _cleanup_free_ char *t = NULL;
+ int r;
- if (!startswith(name, "/dev/tty"))
- return -EINVAL;
+ assert(from);
+ assert(to);
- r = safe_atou(name+8, &u);
+ r = tempfn_random(to, &t);
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);
- safe_close(fd);
-
- if (r >= 0)
- return 0;
-
- if (errno != EBUSY)
+ if (symlink(from, t) < 0)
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);
- safe_close(fd);
+ if (rename(t, to) < 0) {
+ unlink_noerrno(t);
+ return -errno;
+ }
return 0;
}
-int symlink_atomic(const char *from, const char *to) {
- _cleanup_free_ char *t = NULL;
+int symlink_idempotent(const char *from, const char *to) {
+ _cleanup_free_ char *p = NULL;
int r;
assert(from);
assert(to);
- r = tempfn_random(to, &t);
- if (r < 0)
- return r;
+ if (symlink(from, to) < 0) {
+ if (errno != EEXIST)
+ return -errno;
- if (symlink(from, t) < 0)
- return -errno;
+ r = readlink_malloc(to, &p);
+ if (r < 0)
+ return r;
- if (rename(t, to) < 0) {
- unlink_noerrno(t);
- return -errno;
+ if (!streq(p, from))
+ return -EINVAL;
}
return 0;
return saved;
}
-void warn_melody(void) {
- _cleanup_close_ int fd = -1;
-
- fd = open("/dev/console", O_WRONLY|O_CLOEXEC|O_NOCTTY);
- if (fd < 0)
- return;
-
- /* Yeah, this is synchronous. Kinda sucks. But well... */
-
- ioctl(fd, KIOCSOUND, (int)(1193180/440));
- usleep(125*USEC_PER_MSEC);
-
- ioctl(fd, KIOCSOUND, (int)(1193180/220));
- usleep(125*USEC_PER_MSEC);
-
- ioctl(fd, KIOCSOUND, (int)(1193180/220));
- usleep(125*USEC_PER_MSEC);
-
- ioctl(fd, KIOCSOUND, 0);
-}
-
-int make_console_stdio(void) {
- int fd, r;
-
- /* Make /dev/console the controlling terminal and stdin/stdout/stderr */
-
- fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY);
- if (fd < 0)
- return log_error_errno(fd, "Failed to acquire terminal: %m");
-
- r = make_stdio(fd);
- if (r < 0)
- return log_error_errno(r, "Failed to duplicate terminal fd: %m");
-
- return 0;
-}
-
int get_home_dir(char **_h) {
struct passwd *p;
const char *e;
if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../"))
return false;
- if (strlen(p) > PATH_MAX)
+ if (strlen(p)+1 > PATH_MAX)
return false;
/* The following two checks are not really dangerous, but hey, they still are confusing */
#ifdef O_TMPFILE
/* Try O_TMPFILE first, if it is supported */
- fd = open(path, flags|O_TMPFILE, S_IRUSR|S_IWUSR);
+ fd = open(path, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR);
if (fd >= 0)
return fd;
#endif
return !!S_ISDIR(st.st_mode);
}
+int is_device_node(const char *path) {
+ struct stat info;
+
+ if (lstat(path, &info) < 0)
+ return -errno;
+
+ return !!(S_ISBLK(info.st_mode) || S_ISCHR(info.st_mode));
+}
+
int unquote_first_word(const char **p, char **ret, UnquoteFlags flags) {
_cleanup_free_ char *s = NULL;
size_t allocated = 0, sz = 0;
/* Replaces a string pointer with an strdup()ed new string,
* possibly freeing the old one. */
+ if (streq_ptr(*p, s))
+ return 0;
+
if (s) {
t = strdup(s);
if (!t)
free(*p);
*p = t;
- return 0;
+ return 1;
}
int sethostname_idempotent(const char *s) {
int chattr_fd(int fd, unsigned value, unsigned mask) {
unsigned old_attr, new_attr;
+ struct stat st;
assert(fd >= 0);
+ if (fstat(fd, &st) < 0)
+ return -errno;
+
+ /* Explicitly check whether this is a regular file or
+ * directory. If it is anything else (such as a device node or
+ * fifo), then the ioctl will not hit the file systems but
+ * possibly drivers, where the ioctl might have different
+ * effects. Notably, DRM is using the same ioctl() number. */
+
+ if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode))
+ return -ENOTTY;
+
if (mask == 0)
return 0;
}
int read_attr_fd(int fd, unsigned *ret) {
+ struct stat st;
+
assert(fd >= 0);
+ if (fstat(fd, &st) < 0)
+ return -errno;
+
+ if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode))
+ return -ENOTTY;
+
if (ioctl(fd, FS_IOC_GETFLAGS, ret) < 0)
return -errno;
return read_attr_fd(fd, ret);
}
-int make_lock_file(const char *p, int operation, LockFile *ret) {
- _cleanup_close_ int fd = -1;
- _cleanup_free_ char *t = NULL;
- int r;
-
- /*
- * We use UNPOSIX locks if they are available. They have nice
- * semantics, and are mostly compatible with NFS. However,
- * they are only available on new kernels. When we detect we
- * are running on an older kernel, then we fall back to good
- * old BSD locks. They also have nice semantics, but are
- * slightly problematic on NFS, where they are upgraded to
- * POSIX locks, even though locally they are orthogonal to
- * POSIX locks.
- */
-
- t = strdup(p);
- if (!t)
- return -ENOMEM;
-
- for (;;) {
- struct flock fl = {
- .l_type = (operation & ~LOCK_NB) == LOCK_EX ? F_WRLCK : F_RDLCK,
- .l_whence = SEEK_SET,
- };
- struct stat st;
-
- fd = open(p, O_CREAT|O_RDWR|O_NOFOLLOW|O_CLOEXEC|O_NOCTTY, 0600);
- if (fd < 0)
- return -errno;
-
- r = fcntl(fd, (operation & LOCK_NB) ? F_OFD_SETLK : F_OFD_SETLKW, &fl);
- if (r < 0) {
-
- /* If the kernel is too old, use good old BSD locks */
- if (errno == EINVAL)
- r = flock(fd, operation);
-
- if (r < 0)
- return errno == EAGAIN ? -EBUSY : -errno;
- }
-
- /* If we acquired the lock, let's check if the file
- * still exists in the file system. If not, then the
- * previous exclusive owner removed it and then closed
- * it. In such a case our acquired lock is worthless,
- * hence try again. */
-
- r = fstat(fd, &st);
- if (r < 0)
- return -errno;
- if (st.st_nlink > 0)
- break;
-
- fd = safe_close(fd);
- }
-
- ret->path = t;
- ret->fd = fd;
- ret->operation = operation;
-
- fd = -1;
- t = NULL;
-
- return r;
-}
-
-int make_lock_file_for(const char *p, int operation, LockFile *ret) {
- const char *fn;
- char *t;
-
- assert(p);
- assert(ret);
-
- fn = basename(p);
- if (!filename_is_valid(fn))
- return -EINVAL;
-
- t = newa(char, strlen(p) + 2 + 4 + 1);
- stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), fn), ".lck");
-
- return make_lock_file(t, operation, ret);
-}
-
-void release_lock_file(LockFile *f) {
- int r;
-
- if (!f)
- return;
-
- if (f->path) {
-
- /* If we are the exclusive owner we can safely delete
- * the lock file itself. If we are not the exclusive
- * owner, we can try becoming it. */
-
- if (f->fd >= 0 &&
- (f->operation & ~LOCK_NB) == LOCK_SH) {
- static const struct flock fl = {
- .l_type = F_WRLCK,
- .l_whence = SEEK_SET,
- };
-
- r = fcntl(f->fd, F_OFD_SETLK, &fl);
- if (r < 0 && errno == EINVAL)
- r = flock(f->fd, LOCK_EX|LOCK_NB);
-
- if (r >= 0)
- f->operation = LOCK_EX|LOCK_NB;
- }
-
- if ((f->operation & ~LOCK_NB) == LOCK_EX)
- unlink_noerrno(f->path);
-
- free(f->path);
- f->path = NULL;
- }
-
- f->fd = safe_close(f->fd);
- f->operation = 0;
-}
-
static size_t nul_length(const uint8_t *p, size_t sz) {
size_t n = 0;
~ianmdlvl / elogind.git / blobdiff