2 files changed, 5 insertions(+), 1 deletions(-)

M port/devproc.c
M port/proc.c

@@ 270,9 270,9 @@ procread(Chan *c, void *va, long n, ulong offset)
 	Ureg kur;
 	uchar *rptr;
 	Mntwalk *mw;
-	int i, j, rsize;
 	Segment *sg, *s;
 	char *a = va, *sps;
+	int i, j, rsize, pid;
 	char statbuf[NSEG*32];
 
 	if(c->qid.path & CHDIR)


@@ 440,9 440,12 @@ procread(Chan *c, void *va, long n, ulong offset)
 			unlock(&p->exl);
 			error(Enochild);
 		}
+		pid = p->pid;
 		while(p->waitq == 0) {
 			unlock(&p->exl);
 			sleep(&p->waitr, haswaitq, p);
+			if(p->pid != pid)
+				error(Eprocdied);
 			lock(&p->exl);
 		}
 		wq = p->waitq;

@@ 708,6 708,7 @@ pexit(char *exitstr, int freemem)
 
 	lock(&up->exl);		/* Prevent my children from leaving waits */
 	up->pid = 0;
+	wakeup(&up->waitr);
 	unlock(&up->exl);
 
 	for(f = up->waitq; f; f = next) {