90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)fopen.c 5.5 (Berkeley) 2/5/91";*/
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static char *rcsid = "$Id: fopen.c,v 1.1 1994/02/07 22:05:49 proven Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <pthread.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include "local.h"
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extern pthread_mutex_t __sfp_mutex;
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extern pthread_cond_t __sfp_cond;
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extern int __sfp_state;
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FILE *fopen(const char *file, const char *mode)
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{
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register FILE *fp;
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register int f;
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int flags, oflags;
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if ((flags = __sflags(mode, &oflags)) == 0)
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return (NULL);
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if ((f = open(file, oflags, 0666)) < 0) {
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return (NULL);
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}
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pthread_once(&__sdidinit, __sinit);
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pthread_mutex_lock(&__sfp_mutex);
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while (__sfp_state) {
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pthread_cond_wait(&__sfp_cond, &__sfp_mutex);
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}
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if (fp = __sfp()) {
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fp->_file = f;
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fp->_flags = flags;
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/*
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* When opening in append mode, even though we use O_APPEND,
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* we need to seek to the end so that ftell() gets the right
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* answer. If the user then alters the seek pointer, or
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* the file extends, this will fail, but there is not much
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* we can do about this. (We could set __SAPP and check in
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* fseek and ftell.)
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*/
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if (oflags & O_APPEND)
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(void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
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}
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pthread_mutex_unlock(&__sfp_mutex);
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return (fp);
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}
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