integrated yiyus clearurgent refactoring

.hgtags

@@ -56,3 +56,4 @@ d6d3085307d8d98b8b012b669e858fd787befeb1 4.7
 06eb9644e2dad7667d97495eb7d7bc62aa0429e8 5.0
 ce355cea9bb89e162f61913737a46908cdfa7e45 5.1
 e4bcaca8e6ef13d2c3b81f1218ad15e5da4d68bd 5.2
+4004d61160355d869a7d2672561caad440751ba0 5.3

dwm.c

@@ -138,7 +138,7 @@ static void attachstack(Client *c);
 static void buttonpress(XEvent *e);
 static void checkotherwm(void);
 static void cleanup(void);
-static void clearurgent(void);
+static void clearurgent(Client *c);
 static void configure(Client *c);
 static void configurenotify(XEvent *e);
 static void configurerequest(XEvent *e);
@@ -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);
@@ -366,20 +365,15 @@ cleanup(void) {
 }
 
 void
-clearurgent(void) {
+clearurgent(Client *c) {
 	XWMHints *wmh;
-	Client *c;
 
-	for(c = clients; c; c = c->next)
-		if(ISVISIBLE(c) && c->isurgent) {
 	c->isurgent = False;
-			if (!(wmh = XGetWMHints(dpy, c->win)))
-				continue;
-
+	if(!(wmh = XGetWMHints(dpy, c->win)))
+		return;
 	wmh->flags &= ~XUrgencyHint;
 	XSetWMHints(dpy, c->win, wmh);
 	XFree(wmh);
-		}
 }
 
 void
@@ -618,6 +612,8 @@ focus(Client *c) {
 		XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 	}
 	if(c) {
+		if(c->isurgent)
+			clearurgent(c);
 		detachstack(c);
 		attachstack(c);
 		grabbuttons(c, True);
@@ -1392,15 +1388,11 @@ 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 +1400,10 @@ 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
@@ -1503,7 +1497,6 @@ toggleview(const Arg *arg) {
 
 	if(mask) {
 		tagset[seltags] = mask;
-		clearurgent();
 		arrange();
 	}
 }
@@ -1676,7 +1669,6 @@ view(const Arg *arg) {
 	seltags ^= 1; /* toggle sel tagset */
 	if(arg->ui & TAGMASK)
 		tagset[seltags] = arg->ui & TAGMASK;
-	clearurgent();
 	arrange();
 }