libdraw: fix leftover processes or programs failing to restore window labels when receiving interrupt note

fix the default note handler for event programs. only handle non system
notes or notes in the slave processes. for interrupt in the main process,
just call exits() which will do the cleanup and restore window label
properly.

this makes completely overriding the note handler in gping and
stats uneccesary.

3 files changed, 21 insertions, 39 deletions

diff --git a/sys/src/cmd/ip/gping.c b/sys/src/cmd/ip/gping.c
index ad5d89172..ebc8d57ac 100644
--- a/sys/src/cmd/ip/gping.c
+++ b/sys/src/cmd/ip/gping.c
@@ -630,16 +630,6 @@ lostval(Machine *m, long *v, long *vmax, long *mark)
 	*vmax = 100;
 }
 
-jmp_buf catchalarm;
-
-void
-alarmed(void *a, char *s)
-{
-	if(strcmp(s, "alarm") == 0)
-		notejmp(a, catchalarm, 1);
-	noted(NDFLT);
-}
-
 void
 usage(void)
 {
@@ -1030,7 +1020,6 @@ main(int argc, char *argv[])
 	}
 	colinit();
 	einit(Emouse);
-	notify(nil);
 	startproc(mouseproc, 0);
 	display->locking = 1;	/* tell library we're using the display lock */
 
diff --git a/sys/src/cmd/stats.c b/sys/src/cmd/stats.c
index fec34af03..2b70c8ad2 100644
--- a/sys/src/cmd/stats.c
+++ b/sys/src/cmd/stats.c
@@ -710,12 +710,12 @@ initmach(Machine *m, char *name)
 
 jmp_buf catchalarm;
 
-void
+int
 alarmed(void *a, char *s)
 {
 	if(strcmp(s, "alarm") == 0)
 		notejmp(a, catchalarm, 1);
-	noted(NDFLT);
+	return 0;
 }
 
 int
@@ -781,7 +781,7 @@ readmach(Machine *m, int init)
 			eresized(0);
 	}
 	if(m->remote){
-		notify(alarmed);
+		atnotify(alarmed, 1);
 		alarm(5000);
 	}
 	if(needswap(init) && loadbuf(m, &m->swapfd) && readswap(m, a))
@@ -809,7 +809,7 @@ readmach(Machine *m, int init)
 			 m->temp[n] = a[0];
 	if(m->remote){
 		alarm(0);
-		notify(nil);
+		atnotify(alarmed, 0);
 	}
 }
 
@@ -1410,7 +1410,6 @@ main(int argc, char *argv[])
 	}
 	colinit();
 	einit(Emouse);
-	notify(nil);
 	startproc(mouseproc, Mouseproc);
 	pids[Mainproc] = getpid();
 	display->locking = 1;	/* tell library we're using the display lock */
diff --git a/sys/src/libdraw/event.c b/sys/src/libdraw/event.c
index bb4b60179..8b0ad5e64 100644
--- a/sys/src/libdraw/event.c
+++ b/sys/src/libdraw/event.c
@@ -346,39 +346,33 @@ eforkslave(ulong key)
 }
 
 static int
-enote(void *v, char *s)
+enote(void*, char *s)
 {
-	char t[1];
 	int i, pid;
 
-	USED(v, s);
-	pid = getpid();
-	if(pid != parentpid){
-		for(i=0; i<nslave; i++){
-			if(pid == eslave[i].pid){
-				t[0] = MAXSLAVE;
-				write(epipe[1], t, 1);
-				break;
-			}
-		}
+	if(strncmp(s, "sys:", 4) == 0 || strcmp(s, "alarm") == 0)
 		return 0;
-	}
-	close(epipe[0]);
-	epipe[0] = -1;
-	close(epipe[1]);
-	epipe[1] = -1;
-	for(i=0; i<nslave; i++){
+	pid = getpid();
+	for(i=0; i<nslave; i++)
 		if(pid == eslave[i].pid)
-			continue;	/* don't kill myself */
-		postnote(PNPROC, eslave[i].pid, "die");
-	}
-	return 0;
+			return 1;
+	if(pid != parentpid)
+		return 0;
+	exits("killed");
+	return 1;
 }
 
 static void
 ekill(void)
 {
-	enote(0, 0);
+	int i, pid;
+
+	pid = getpid();
+	for(i=0; i<nslave; i++){
+		if(pid == eslave[i].pid)
+			continue;	/* don't kill myself */
+		postnote(PNPROC, eslave[i].pid, "die");
+	}
 }
 
 Mouse