process-util: add pidref_get_uid() and rename get_process_uid() → pidref_get_uid()

src/basic/process-util.c

@@ -572,7 +572,8 @@ static int get_process_id(pid_t pid, const char *field, uid_t *ret) {
         return -EIO;
 }
 
-int get_process_uid(pid_t pid, uid_t *ret) {
+int pid_get_uid(pid_t pid, uid_t *ret) {
+        assert(ret);
 
         if (pid == 0 || pid == getpid_cached()) {
                 *ret = getuid();
@@ -582,6 +583,26 @@ int get_process_uid(pid_t pid, uid_t *ret) {
         return get_process_id(pid, "Uid:", ret);
 }
 
+int pidref_get_uid(const PidRef *pid, uid_t *ret) {
+        uid_t uid;
+        int r;
+
+        if (!pidref_is_set(pid))
+                return -ESRCH;
+
+        r = pid_get_uid(pid->pid, &uid);
+        if (r < 0)
+                return r;
+
+        r = pidref_verify(pid);
+        if (r < 0)
+                return r;
+
+        if (ret)
+                *ret = uid;
+        return 0;
+}
+
 int get_process_gid(pid_t pid, gid_t *ret) {
 
         if (pid == 0 || pid == getpid_cached()) {

src/basic/process-util.h

@@ -46,7 +46,8 @@ int pidref_get_cmdline(const PidRef *pid, size_t max_columns, ProcessCmdlineFlag
 int pid_get_cmdline_strv(pid_t pid, ProcessCmdlineFlags flags, char ***ret);
 int pidref_get_cmdline_strv(const PidRef *pid, ProcessCmdlineFlags flags, char ***ret);
 int get_process_exe(pid_t pid, char **ret);
-int get_process_uid(pid_t pid, uid_t *ret);
+int pid_get_uid(pid_t pid, uid_t *ret);
+int pidref_get_uid(const PidRef *pid, uid_t *ret);
 int get_process_gid(pid_t pid, gid_t *ret);
 int get_process_capeff(pid_t pid, char **ret);
 int get_process_cwd(pid_t pid, char **ret);