Author: eadler
Date: Wed Jun 13 03:40:59 2012
New Revision: 236984
URL: http://svn.freebsd.org/changeset/base/236984
Log:
MFC r236286:
Fix likely race condition if wait_child() is interrupted by sigchild()
PR: bin/102834
Approved by: cperciva (implicit)
Modified:
stable/9/usr.bin/mail/popen.c
Directory Properties:
stable/9/usr.bin/mail/ (props changed)
Modified: stable/9/usr.bin/mail/popen.c
==============================================================================
--- stable/9/usr.bin/mail/popen.c Wed Jun 13 03:34:42 2012
(r236983)
+++ stable/9/usr.bin/mail/popen.c Wed Jun 13 03:40:59 2012
(r236984)
@@ -336,12 +336,14 @@ int
wait_child(int pid)
{
sigset_t nset, oset;
- struct child *cp = findchild(pid);
+ struct child *cp;
(void)sigemptyset(&nset);
(void)sigaddset(&nset, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &nset, &oset);
+ cp = findchild(pid);
+
while (!cp->done)
(void)sigsuspend(&oset);
wait_status = cp->status;
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