reverted spawn

dwm.c

@@ -182,7 +182,6 @@ static void setlayout(const Arg *arg);
 static void setmfact(const Arg *arg);
 static void setup(void);
 static void showhide(Client *c);
-static void sigchld(int signal);
 static void spawn(const Arg *arg);
 static void tag(const Arg *arg);
 static int textnw(const char *text, unsigned int len);
@@ -1392,15 +1391,11 @@ showhide(Client *c) {
 	}
 }
 
-
-void
-sigchld(int signal) {
-	while(0 < waitpid(-1, NULL, WNOHANG));
-}
-
 void
 spawn(const Arg *arg) {
-	signal(SIGCHLD, sigchld);
+	/* The double-fork construct avoids zombie processes and keeps the code
+	 * clean from stupid signal handlers. */
+	if(fork() == 0) {
 		if(fork() == 0) {
 			if(dpy)
 				close(ConnectionNumber(dpy));
@@ -1408,8 +1403,10 @@ spawn(const Arg *arg) {
 			execvp(((char **)arg->v)[0], (char **)arg->v);
 			fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
 			perror(" failed");
+		}
 		exit(0);
 	}
+	wait(0);
 }
 
 void