util.c: use read_one_line_file where possible

[elogind.git] / src / shared / util.c

diff --git a/src/shared/util.c b/src/shared/util.c
index 6b6722c2780200a62f128e24674ac27f68c7ba1a..c824c3934e3dedc2c8cda61581fd0ee9b0ed1f1d 100644 (file)
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -440,8 +440,7 @@ char *split_quoted(const char *c, size_t *l, char **state) {
 
 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
         int r;
-        _cleanup_fclose_ FILE *f = NULL;
-        char line[LINE_MAX];
+        _cleanup_free_ char *line = NULL;
         long unsigned ppid;
         const char *p;
 
@@ -454,14 +453,9 @@ int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
         }
 
         p = procfs_file_alloca(pid, "stat");
-        f = fopen(p, "re");
-        if (!f)
-                return -errno;
-
-        if (!fgets(line, sizeof(line), f)) {
-                r = feof(f) ? -EIO : -errno;
+        r = read_one_line_file(p, &line);
+        if (r < 0)
                 return r;
-        }
 
         /* Let's skip the pid and comm fields. The latter is enclosed
          * in () but does not escape any () in its value, so let's
@@ -488,28 +482,17 @@ int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
 }
 
 int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
-        _cleanup_fclose_ FILE *f = NULL;
-        char line[LINE_MAX];
+        int r;
+        _cleanup_free_ char *line = NULL;
         const char *p;
 
         assert(pid >= 0);
         assert(st);
 
-        if (pid == 0)
-                p = "/proc/self/stat";
-        else
-                p = procfs_file_alloca(pid, "stat");
-
-        f = fopen(p, "re");
-        if (!f)
-                return errno == ENOENT ? -ESRCH : -errno;
-
-        if (!fgets(line, sizeof(line), f)) {
-                if (ferror(f))
-                        return -errno;
-
-                return -EIO;
-        }
+        p = procfs_file_alloca(pid, "stat");
+        r = read_one_line_file(p, &line);
+        if (r < 0)
+                return r;
 
         /* Let's skip the pid and comm fields. The latter is enclosed
          * in () but does not escape any () in its value, so let's
@@ -573,10 +556,7 @@ int get_process_comm(pid_t pid, char **name) {
         assert(name);
         assert(pid >= 0);
 
-        if (pid == 0)
-                p = "/proc/self/comm";
-        else
-                p = procfs_file_alloca(pid, "comm");
+        p = procfs_file_alloca(pid, "comm");
 
         r = read_one_line_file(p, name);
         if (r == -ENOENT)
@@ -594,10 +574,7 @@ int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char *
         assert(line);
         assert(pid >= 0);
 
-        if (pid == 0)
-                p = "/proc/self/cmdline";
-        else
-                p = procfs_file_alloca(pid, "cmdline");
+        p = procfs_file_alloca(pid, "cmdline");
 
         f = fopen(p, "re");
         if (!f)
@@ -716,10 +693,7 @@ int get_process_capeff(pid_t pid, char **capeff) {
         assert(capeff);
         assert(pid >= 0);
 
-        if (pid == 0)
-                p = "/proc/self/status";
-        else
-                p = procfs_file_alloca(pid, "status");
+        p = procfs_file_alloca(pid, "status");
 
         return get_status_field(p, "\nCapEff:", capeff);
 }
@@ -732,10 +706,7 @@ int get_process_exe(pid_t pid, char **name) {
         assert(pid >= 0);
         assert(name);
 
-        if (pid == 0)
-                p = "/proc/self/exe";
-        else
-                p = procfs_file_alloca(pid, "exe");
+        p = procfs_file_alloca(pid, "exe");
 
         r = readlink_malloc(p, name);
         if (r < 0)
@@ -2542,24 +2513,17 @@ int getttyname_harder(int fd, char **r) {
 }
 
 int get_ctty_devnr(pid_t pid, dev_t *d) {
-        _cleanup_fclose_ FILE *f = NULL;
-        char line[LINE_MAX], *p;
+        int r;
+        _cleanup_free_ char *line = NULL;
+        const char *p;
         unsigned long ttynr;
-        const char *fn;
 
         assert(pid >= 0);
 
-        if (pid == 0)
-                fn = "/proc/self/stat";
-        else
-                fn = procfs_file_alloca(pid, "stat");
-
-        f = fopen(fn, "re");
-        if (!f)
-                return -errno;
-
-        if (!fgets(line, sizeof(line), f))
-                return feof(f) ? -EIO : -errno;
+        p = procfs_file_alloca(pid, "stat");
+        r = read_one_line_file(p, &line);
+        if (r < 0)
+                return r;
 
         p = strrchr(line, ')');
         if (!p)
@@ -5095,10 +5059,7 @@ int getenv_for_pid(pid_t pid, const char *field, char **_value) {
         assert(field);
         assert(_value);
 
-        if (pid == 0)
-                path = "/proc/self/environ";
-        else
-                path = procfs_file_alloca(pid, "environ");
+        path = procfs_file_alloca(pid, "environ");
 
         f = fopen(path, "re");
         if (!f)
@@ -6172,6 +6133,11 @@ int getpeersec(int fd, char **ret) {
                 }
         }
 
+        if (isempty(s)) {
+                free(s);
+                return -ENOTSUP;
+        }
+
         *ret = s;
         return 0;
 }