From 6613d9f9a1a5630bab30bc2b70bdc793977073ee 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 b3c43ee..7c0f978 100644
--- a/dwm.c
+++ b/dwm.c
@@ -1541,6 +1541,8 @@ setup(void)
Atom utf8string;
/* clean up any zombies immediately */
+ if (signal(SIGCHLD, sigchld) == SIG_ERR)
+ die("can't install SIGCHLD handler:");
sigchld(0);
/* init screen */
@@ -1638,8 +1640,6 @@ 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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