ref: 8b19c4f273613b0477b13d6579e59396084671fc
parent: e80c7eb50b65ff7bc864fe551c24ac26c15f3e8d
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Fri Jan 5 02:10:58 EST 2024
9nfs: fix rfork() race with shared pid variable
--- a/sys/src/cmd/9nfs/chat.c
+++ b/sys/src/cmd/9nfs/chat.c
@@ -26,7 +26,7 @@
void
chatsrv(char *name)
{
- int n, sfd, pfd[2];
+ int n, sfd, pid, pfd[2];
char *p, buf[256];
if(name && *name)
@@ -44,13 +44,14 @@
sfd = create(nbuf, OWRITE, 0600);
if(sfd < 0)
panic("chatsrv create %s", nbuf);
- chatpid = rfork(RFPROC|RFMEM);
- switch(chatpid){
+ pid = rfork(RFPROC|RFMEM);
+ switch(pid){
case -1:
panic("chatsrv fork");
case 0:
break;
default:
+ chatpid = pid;
atexit(killchat);
return;
}