/* * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the author nor the names of any co-contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * POSIX stdio FILE locking functions. These assume that the locking * is only required at FILE structure level, not at file descriptor * level too. * */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: src/lib/libc/stdio/_flock_stub.c,v 1.16 2008/04/17 22:17:53 jhb Exp $"); #include "namespace.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <pthread.h> #include "un-namespace.h" #include "local.h" /* * Weak symbols for externally visible functions in this file: */ __weak_reference(_flockfile, flockfile); __weak_reference(_flockfile_debug_stub, _flockfile_debug); __weak_reference(_ftrylockfile, ftrylockfile); __weak_reference(_funlockfile, funlockfile); void _flockfile(FILE *fp) { _pthread_mutex_lock(&fp->_fl_mutex); } /* * This can be overriden by the threads library if it is linked in. */ void _flockfile_debug_stub(FILE *fp, char *fname, int lineno) { _flockfile(fp); } int _ftrylockfile(FILE *fp) { int ret = 0; if (_pthread_mutex_trylock(&fp->_fl_mutex) != 0) ret = -1; return (ret); } void _funlockfile(FILE *fp) { _pthread_mutex_unlock(&fp->_fl_mutex); }