X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=util.c;h=29f48b08e3b918991350caa2794682a239b7ca5e;hp=b54c24a3dcd9efaecbe70ddb39efe8129b3eabd7;hb=bbd671356647d9d2c7d6c2c0401e907e169c7576;hpb=ef886c6ab86436f0d8b5128799a8f801c62d859a

diff --git a/util.c b/util.c
index b54c24a3d..29f48b08e 100644
--- a/util.c
+++ b/util.c
@@ -1,5 +1,24 @@
 /*-*- Mode: C; c-basic-offset: 8 -*-*/
 
+/***
+  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 <http://www.gnu.org/licenses/>.
+***/
+
 #include <assert.h>
 #include <string.h>
 #include <unistd.h>
@@ -11,16 +30,35 @@
 #include <sched.h>
 #include <sys/resource.h>
 #include <linux/sched.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
 
 #include "macro.h"
 #include "util.h"
 #include "ioprio.h"
 #include "missing.h"
+#include "log.h"
+#include "strv.h"
+
+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) {
+usec_t now(clockid_t clock_id) {
         struct timespec ts;
 
-        assert_se(clock_gettime(clock, &ts) == 0);
+        assert_se(clock_gettime(clock_id, &ts) == 0);
 
         return timespec_load(&ts);
 }
@@ -250,7 +288,7 @@ int safe_atolli(const char *s, long long int *ret_lli) {
 }
 
 /* Split a string into words. */
-char *split_spaces(const char *c, size_t *l, char **state) {
+char *split(const char *c, size_t *l, const char *separator, char **state) {
         char *current;
 
         current = *state ? *state : (char*) c;
@@ -258,8 +296,8 @@ char *split_spaces(const char *c, size_t *l, char **state) {
         if (!*current || *c == 0)
                 return NULL;
 
-        current += strspn(current, WHITESPACE);
-        *l = strcspn(current, WHITESPACE);
+        current += strspn(current, separator);
+        *l = strcspn(current, separator);
         *state = current+*l;
 
         return (char*) current;
@@ -302,6 +340,21 @@ char *split_quoted(const char *c, size_t *l, char **state) {
         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;
@@ -372,7 +425,7 @@ finish:
 int read_one_line_file(const char *fn, char **line) {
         FILE *f;
         int r;
-        char t[64], *c;
+        char t[2048], *c;
 
         assert(fn);
         assert(line);
@@ -398,6 +451,33 @@ finish:
         return r;
 }
 
+char *truncate_nl(char *s) {
+        assert(s);
+
+        s[strcspn(s, NEWLINE)] = 0;
+        return s;
+}
+
+int get_process_name(pid_t pid, char **name) {
+        char *p;
+        int r;
+
+        assert(pid >= 1);
+        assert(name);
+
+        if (asprintf(&p, "/proc/%llu/comm", (unsigned long long) pid) < 0)
+                return -ENOMEM;
+
+        r = read_one_line_file(p, name);
+        free(p);
+
+        if (r < 0)
+                return r;
+
+        truncate_nl(*name);
+        return 0;
+}
+
 char *strappend(const char *s, const char *suffix) {
         size_t a, b;
         char *r;
@@ -475,6 +555,9 @@ 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);
 
@@ -484,6 +567,46 @@ char *path_make_absolute(const char *p, const char *prefix) {
         return r;
 }
 
+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;
+}
+
 int reset_all_signal_handlers(void) {
         int sig;
 
@@ -504,7 +627,7 @@ int reset_all_signal_handlers(void) {
                                 return -errno;
         }
 
-    return 0;
+        return 0;
 }
 
 char *strstrip(char *s) {
@@ -528,6 +651,23 @@ char *strstrip(char *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;
+}
+
 char *file_in_same_dir(const char *path, const char *filename) {
         char *e, *r;
         size_t k;
@@ -555,6 +695,53 @@ char *file_in_same_dir(const char *path, const char *filename) {
         return r;
 }
 
+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 = 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 (mkdir(path, mode) < 0)
+                return -errno;
+
+        return 0;
+}
+
 char hexchar(int x) {
         static const char table[16] = "0123456789abcdef";
 
@@ -587,6 +774,18 @@ int unoctchar(char c) {
         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;
@@ -789,8 +988,8 @@ char *xescape(const char *s, const char *bad) {
 
         for (f = s, t = r; *f; f++) {
 
-                if (*f < ' ' || *f >= 127 ||
-                    *f == '\\' || strchr(bad, *f)) {
+                if ((*f < ' ') || (*f >= 127) ||
+                    (*f == '\\') || strchr(bad, *f)) {
                         *(t++) = '\\';
                         *(t++) = 'x';
                         *(t++) = hexchar(*f >> 4);
@@ -805,11 +1004,11 @@ char *xescape(const char *s, const char *bad) {
 }
 
 char *bus_path_escape(const char *s) {
-        assert(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() */
 
@@ -834,11 +1033,11 @@ char *bus_path_escape(const char *s) {
 }
 
 char *bus_path_unescape(const char *s) {
-        assert(s);
-
         char *r, *t;
         const char *f;
 
+        assert(s);
+
         if (!(r = new(char, strlen(s)+1)))
                 return NULL;
 
@@ -932,16 +1131,131 @@ bool path_startswith(const char *path, const char *prefix) {
         }
 }
 
-char *ascii_strlower(char *path) {
+char *ascii_strlower(char *t) {
         char *p;
 
-        assert(path);
+        assert(t);
 
-        for (p = path; *p; p++)
+        for (p = t; *p; p++)
                 if (*p >= 'A' && *p <= 'Z')
                         *p = *p - 'A' + 'a';
 
-        return p;
+        return t;
+}
+
+bool ignore_file(const char *filename) {
+        assert(filename);
+
+        return
+                filename[0] == '.' ||
+                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;
+}
+
+int close_all_fds(const int except[], unsigned n_except) {
+        DIR *d;
+        struct dirent *de;
+        int r = 0;
+
+        if (!(d = opendir("/proc/self/fd")))
+                return -errno;
+
+        while ((de = readdir(d))) {
+                int fd = -1;
+
+                if (de->d_name[0] == '.')
+                        continue;
+
+                if ((r = safe_atoi(de->d_name, &fd)) < 0)
+                        goto finish;
+
+                if (fd < 3)
+                        continue;
+
+                if (fd == dirfd(d))
+                        continue;
+
+                if (except) {
+                        bool found;
+                        unsigned i;
+
+                        found = false;
+                        for (i = 0; i < n_except; i++)
+                                if (except[i] == fd) {
+                                        found = true;
+                                        break;
+                                }
+
+                        if (found)
+                                continue;
+                }
+
+                if ((r = close_nointr(fd)) < 0) {
+                        /* Valgrind has its own FD and doesn't want to have it closed */
+                        if (errno != EBADF)
+                                goto finish;
+                }
+        }
+
+        r = 0;
+
+finish:
+        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;
 }
 
 static const char *const ioprio_class_table[] = {