X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbasic%2Fprocess-util.c;h=5825944c90414a954f14a3fb4c05de9ff60b55cc;hb=27edf6f36e27bff66b04908b4dcebd359ae08116;hp=25044dfaa7bc916bb4768307c082d1fa337d691f;hpb=3cd22db822df747636dcf30ebb8ec5d16bb71880;p=elogind.git

diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index 25044dfaa..5825944c9 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -368,7 +368,6 @@ int get_process_environ(pid_t pid, char **env) {
 
         return 0;
 }
-#endif // 0
 
 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
         int r;
@@ -414,6 +413,7 @@ int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
 
         return 0;
 }
+#endif // 0
 
 int wait_for_terminate(pid_t pid, siginfo_t *status) {
         siginfo_t dummy;
@@ -556,9 +556,12 @@ int getenv_for_pid(pid_t pid, const char *field, char **_value) {
 bool pid_is_unwaited(pid_t pid) {
         /* Checks whether a PID is still valid at all, including a zombie */
 
-        if (pid <= 0)
+        if (pid < 0)
                 return false;
 
+        if (pid <= 1) /* If we or PID 1 would be dead and have been waited for, this code would not be running */
+                return true;
+
         if (kill(pid, 0) >= 0)
                 return true;
 
@@ -570,9 +573,12 @@ bool pid_is_alive(pid_t pid) {
 
         /* Checks whether a PID is still valid and not a zombie */
 
-        if (pid <= 0)
+        if (pid < 0)
                 return false;
 
+        if (pid <= 1) /* If we or PID 1 would be a zombie, this code would not be running */
+                return true;
+
         r = get_process_state(pid);
         if (r == -ESRCH || r == 'Z')
                 return false;