M dwm.c → 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);
@@ -1392,24 +1391,22 @@ XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
 	}
 }
 
-
-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(dpy)
-			close(ConnectionNumber(dpy));
-		setsid();
-		execvp(((char **)arg->v)[0], (char **)arg->v);
-		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
-		perror(" failed");
+		if(fork() == 0) {
+			if(dpy)
+				close(ConnectionNumber(dpy));
+			setsid();
+			execvp(((char **)arg->v)[0], (char **)arg->v);
+			fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
+			perror(" failed");
+		}
 		exit(0);
 	}
+	wait(0);
 }
 
 void