revert 712d6639ff8e863560328131bbb92b248dc9cde7

dwm.c

@@ -259,6 +259,7 @@ static void setmfact(const Arg *arg);
 static void setup(void);
 static void seturgent(Client *c, int urg);
 static void showhide(Client *c);
+static void sigchld(int unused);
 #ifndef __OpenBSD__
 static int getdwmblockspid();
 static void sigdwmblocks(const Arg *arg);
@@ -1855,16 +1856,9 @@ setup(void)
 	int i;
 	XSetWindowAttributes wa;
 	Atom utf8string;
-	struct sigaction sa;
 
-	/* do not transform children into zombies when they terminate */
-	sigemptyset(&sa.sa_mask);
-	sa.sa_flags = SA_NOCLDSTOP | SA_NOCLDWAIT | SA_RESTART;
-	sa.sa_handler = SIG_IGN;
-	sigaction(SIGCHLD, &sa, NULL);
-
-	/* clean up any zombies (inherited from .xinitrc etc) immediately */
-	while (waitpid(-1, NULL, WNOHANG) > 0);
+	/* clean up any zombies immediately */
+	sigchld(0);
 
 	signal(SIGHUP, sighup);
 	signal(SIGTERM, sigterm);
@@ -1999,6 +1993,14 @@ sigdwmblocks(const Arg *arg)
 }
 #endif
 
+void
+sigchld(int unused)
+{
+	if (signal(SIGCHLD, sigchld) == SIG_ERR)
+		die("can't install SIGCHLD handler:");
+	while (0 < waitpid(-1, NULL, WNOHANG));
+}
+
 void
 spawn(const Arg *arg)
 {