X-Git-Url: https://git.xinqibao.xyz/dwm.git/blobdiff_plain/6a3ae5e26a5cebfd35f2423aec0c47843b5a85be..838a1ff950eb42e4137cfd7039a0e78227b2ef70:/util.c

diff --git a/util.c b/util.c
index 2eb9eb2..91df00b 100644
--- a/util.c
+++ b/util.c
@@ -51,12 +51,13 @@ spawn(Arg *arg)
 
 	if(!arg->cmd)
 		return;
+	/* the double-fork construct avoids zombie processes */
 	if(fork() == 0) {
 		if(fork() == 0) {
 			if(dpy)
 				close(ConnectionNumber(dpy));
 			setsid();
-			execl(shell, shell, "-c", arg->cmd, NULL);
+			execl(shell, shell, "-c", arg->cmd, (char *)NULL);
 			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
 			perror(" failed");
 		}