From 2cff816768b35933da6e1a7360b37e660bc5f37b Mon Sep 17 00:00:00 2001
From: NRK <nrk@disroot.org>
Date: Thu, 14 Jul 2022 07:26:40 +0600
Subject: do not call signal-unsafe function inside sighanlder

die() calls vprintf, fputc and exit; none of these are
async-signal-safe, see `man 7 signal-safety`.
---
 dwm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dwm.c b/dwm.c
index 3eab607..a41a37b 100644
--- a/dwm.c
+++ b/dwm.c
@@ -1726,6 +1726,8 @@ setup(void)
 	Atom utf8string;
 
 	/* clean up any zombies immediately */
+	if (signal(SIGCHLD, sigchld) == SIG_ERR)
+		die("can't install SIGCHLD handler:");
 	sigchld(0);
 
 	signal(SIGHUP, sighup);
@@ -1830,8 +1832,6 @@ showhide(Client *c)
 void
 sigchld(int unused)
 {
-	if (signal(SIGCHLD, sigchld) == SIG_ERR)
-		die("can't install SIGCHLD handler:");
 	while (0 < waitpid(-1, NULL, WNOHANG));
 }
 
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