From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 20 Jul 2016 09:14:48 +0000 (+0200)
Subject: util: don't send SIGCONT following a SIGCONT or SIGKILL in kill_and_sigcont()
X-Git-Tag: v231~28^2~5
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=26f417d3e8dd2522adfdc4c8fed4c36fa40f48fc;p=thirdparty%2Fsystemd.git

util: don't send SIGCONT following a SIGCONT or SIGKILL in kill_and_sigcont()
---

diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index e38b67405e4..54b644ad56b 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -625,8 +625,10 @@ int kill_and_sigcont(pid_t pid, int sig) {
 
         r = kill(pid, sig) < 0 ? -errno : 0;
 
-        if (r >= 0)
-                kill(pid, SIGCONT);
+        /* If this worked, also send SIGCONT, unless we already just sent a SIGCONT, or SIGKILL was sent which isn't
+         * affected by a process being suspended anyway. */
+        if (r >= 0 && !IN_SET(SIGCONT, SIGKILL))
+                (void) kill(pid, SIGCONT);
 
         return r;
 }