From 5a8af74711acee89cb6c0143587b5c4fdce6d838 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sun, 24 Dec 2017 18:50:17 +0100
Subject: [PATCH] process-util: debug log if PR_SET_NAME fails.

---
 src/basic/process-util.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index 2516730a8a..05373689ea 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -304,8 +304,10 @@ int rename_process(const char name[]) {
 
         l = strlen(name);
 
-        /* First step, change the comm field. */
-        (void) prctl(PR_SET_NAME, name);
+        /* First step, change the comm field. The main thread's comm is identical to the process comm. This means we
+         * can use PR_SET_NAME, which sets the thread name for the calling thread. */
+        if (prctl(PR_SET_NAME, name) < 0)
+                log_debug_errno(errno, "PR_SET_NAME failed: %m");
         if (l > 15) /* Linux process names can be 15 chars at max */
                 truncated = true;