From b628c4dded8d514451cee188245aec42aea0707e Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 27 Mar 2018 15:01:02 +0200
Subject: [PATCH] process-util: add TAKE_PID(), similar to TAKE_PTR/TAKE_FD,
 but for child process PIDs

---
 src/basic/process-util.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/basic/process-util.h b/src/basic/process-util.h
index eff42d053..ee094932a 100644
--- a/src/basic/process-util.h
+++ b/src/basic/process-util.h
@@ -209,3 +209,11 @@ int fork_agent(const char *name, const int except[], unsigned n_except, pid_t *p
 #endif
 
 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_;                          \
+        })
-- 
2.30.2