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| author | eadler <eadler@FreeBSD.org> | 2012-05-30 03:55:44 +0000 |
|---|---|---|
| committer | eadler <eadler@FreeBSD.org> | 2012-05-30 03:55:44 +0000 |
| commit | 336581c2f4022bc82b73d00e4b17bb842bcdf0bf (patch) | |
| tree | 7630bcd74112512560d6d9b409c3d88da80a8c8f /usr.bin/mail/popen.c | |
| parent | 3f451eb3b163781d5464a085d3aa219a7b232861 (diff) | |
| download | FreeBSD-src-336581c2f4022bc82b73d00e4b17bb842bcdf0bf.zip FreeBSD-src-336581c2f4022bc82b73d00e4b17bb842bcdf0bf.tar.gz | |
Fix likely race condition if wait_child() is interrupted by sigchild()
PR: bin/102834
Submitted by: Andreas Longwitz <longwitz@incore.de>
Approved by: cperciva
MFC after: 2 weeks
Diffstat (limited to 'usr.bin/mail/popen.c')
| -rw-r--r-- | usr.bin/mail/popen.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/usr.bin/mail/popen.c b/usr.bin/mail/popen.c index 18bf7e5..c4d1746 100644 --- a/usr.bin/mail/popen.c +++ b/usr.bin/mail/popen.c @@ -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; |
