Author: jilles
Date: Fri May 4 20:45:53 2012
New Revision: 235035
URL: http://svn.freebsd.org/changeset/base/235035
Log:
MFC r234057: sem_open: Make sure to fail an O_CREAT|O_EXCL open, even if
that semaphore is already open in this process.
If the named semaphore is already open, sem_open() only increments a
reference count and did not take the flags into account (which otherwise
happens by passing them to open()). Add an extra check for O_CREAT|O_EXCL.
PR: kern/166706
Modified:
stable/9/lib/libc/gen/sem_new.c
Directory Properties:
stable/9/lib/libc/ (props changed)
Modified: stable/9/lib/libc/gen/sem_new.c
==============================================================================
--- stable/9/lib/libc/gen/sem_new.c Fri May 4 20:31:27 2012
(r235034)
+++ stable/9/lib/libc/gen/sem_new.c Fri May 4 20:45:53 2012
(r235035)
@@ -162,10 +162,16 @@ _sem_open(const char *name, int flags, .
_pthread_mutex_lock(&sem_llock);
LIST_FOREACH(ni, &sem_list, next) {
if (strcmp(name, ni->name) == 0) {
- ni->open_count++;
- sem = ni->sem;
- _pthread_mutex_unlock(&sem_llock);
- return (sem);
+ if ((flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) {
+ _pthread_mutex_unlock(&sem_llock);
+ errno = EEXIST;
+ return (SEM_FAILED);
+ } else {
+ ni->open_count++;
+ sem = ni->sem;
+ _pthread_mutex_unlock(&sem_llock);
+ return (sem);
+ }
}
}
_______________________________________________
svn-src-stable-9@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-stable-9
To unsubscribe, send any mail to "svn-src-stable-9-unsubscr...@freebsd.org"
