commit 74be46038de399f5d5ba48bef15a3b649b883967
from: Michael Teichgräber <mt4swm@googlemail.com>
date: Sat Aug 08 20:27:01 2009 UTC

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

commit - 1d534ed6ceb13aa90fea2d0889bdb28ff946ac8d
commit + 74be46038de399f5d5ba48bef15a3b649b883967
blob - 45419f0d17e69478529635479c006b3f18f0dbc2
blob + 62d52c2cf37913abd714912f0b2e7540461583f2
--- src/cmd/rc/havefork.c
+++ 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;
 	}
 }