From b3a20a96eb2b91a5b0b8a8fb506e20a2fb50ebe8 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Wed, 30 Dec 2020 00:10:11 -0500
Subject: libthread: add threadmaybackground

Programs that want to background themselves now need
to define threadmaybackground returning 1.
This avoids a confusing (to people and debuggers)
extra parent process for all the threaded programs
that will never want to background themselves.
---
 src/libthread/daemonize.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

(limited to 'src/libthread/daemonize.c')

diff --git a/src/libthread/daemonize.c b/src/libthread/daemonize.c
index 387d1527..f994ffe1 100644
--- a/src/libthread/daemonize.c
+++ b/src/libthread/daemonize.c
@@ -8,7 +8,7 @@
 #undef wait
 
 static int sigpid;
-static int threadpassfd;
+static int threadpassfd = -1;
 static int gotsigchld;
 
 static void
@@ -163,9 +163,9 @@ _threadsetupdaemonize(void)
 void
 _threaddaemonize(void)
 {
-	if(threadpassfd >= 0){
-		write(threadpassfd, "0", 1);
-		close(threadpassfd);
-		threadpassfd = -1;
-	}
+	if(threadpassfd < 0)
+		sysfatal("threads in main proc exited w/o threadmaybackground");
+	write(threadpassfd, "0", 1);
+	close(threadpassfd);
+	threadpassfd = -1;
 }
-- 
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