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9nfs: fix rfork() race with shared pid variable

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This commit is contained in:
cinap_lenrek 2024-01-05 07:10:58 +00:00
parent e80c7eb50b
commit 8b19c4f273
1 changed files with 4 additions and 3 deletions
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7
sys/src/cmd/9nfs/chat.c
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@ -26,7 +26,7 @@ killchat(void)
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 @@ chatsrv(char *name)
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;
}