From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 3 Nov 2021 14:55:14 +0000 (+0100)
Subject: process-util: rework TAKE_PID() to be side-effect free
X-Git-Tag: v250-rc1~364^2~3
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=883946f0d2a8d8086749636b729719c22c0c0dba;p=thirdparty%2Fsystemd.git

process-util: rework TAKE_PID() to be side-effect free
---

diff --git a/src/basic/process-util.h b/src/basic/process-util.h
index c7622c98df5..25dea35ce6c 100644
--- a/src/basic/process-util.h
+++ b/src/basic/process-util.h
@@ -192,8 +192,9 @@ assert_cc(TASKS_MAX <= (unsigned long) PID_T_MAX);
 /* Like TAKE_PTR() but for child PIDs, resetting them to 0 */
 #define TAKE_PID(pid)                           \
         ({                                      \
-                pid_t _pid_ = (pid);            \
-                (pid) = 0;                      \
+                pid_t *_ppid_ = &(pid);         \
+                pid_t _pid_ = *_ppid_;          \
+                *_ppid_ = 0;                    \
                 _pid_;                          \
         })