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fix hanging procs

--- a/stream.c

+++ b/stream.c

@@ -38,8 +38,6 @@

 void

 Sclose(Stream *s)

 {

-	if(s->pid > 0)

-		postnote(PNPROC, s->pid, "interrupt");

 	s->ops.close(s);

 }

--- a/stream.h

+++ b/stream.h

@@ -63,7 +63,6 @@

 	void *b;

 	u8int *buf;

 	int bufsz;

-	int pid;

 };

 Stream *Sopen(char *filename, int *num);

--- a/stream_mp4.c

+++ b/stream_mp4.c

@@ -16,6 +16,7 @@

 	pipe(p);

 	if((pid = rfork(RFFDG|RFPROC|RFNOMNT)) == 0){

 		close(0);

+		close(p[0]);

 		dup(p[1], 1); close(p[1]);

 		if(!debug){

 			dup(fd = open("/dev/null", OWRITE), 2);

@@ -65,7 +66,7 @@

 			s = streams+ns;

 			if(nvideo < 1 && strcmp(v[1], "video") == 0){

-				if((s->pid = mcfs(argv, &sp)) > 0 && ivfopenb(Bfdopen(sp, OREAD), s, failed) == 0){

+				if(mcfs(argv, &sp) > 0 && ivfopenb(Bfdopen(sp, OREAD), s, failed) == 0){

 					nvideo++;

 					ns++;

 				}