plan9port

commit 74be46038de399f5d5ba48bef15a3b649b883967
parent 1d534ed6ceb13aa90fea2d0889bdb28ff946ac8d
Author: Michael Teichgräber <mt4swm@googlemail.com>
Date:   Sat,  8 Aug 2009 16:27:01 -0400

rc: fix segfault when SIGINT is received

Save the value of `runq' at the start of the function, so that the `pc'
update
at the end does work on that original value, and not on a probably
modified
value of `runq'.

fixes #14 http://code.swtch.com/plan9port/issue/14/

http://codereview.appspot.com/104066

Diffstat:
M
src/cmd/rc/havefork.c
 | 
3
++-

1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/cmd/rc/havefork.c b/src/cmd/rc/havefork.c
@@ -110,6 +110,7 @@ Xpipe(void)
 void
 Xbackq(void)
 {
+	struct thread *p = runq;
 	char wd[8193];
 	int c;
 	char *s, *ewd=&wd[8192], *stop;
@@ -164,7 +165,7 @@ Xbackq(void)
 			runq->argv->words = v;
 			v = nextv;
 		}
-		runq->pc = runq->code[runq->pc].i;
+		p->pc = p->code[p->pc].i;
 		return;
 	}
 }