freebsd-dev/lib/libc_r/uthread/uthread_file.c

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/*
* Copyright (c) 1995 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. 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.
*
*/
#include <signal.h>
#include <stdio.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
void
_thread_flockfile(FILE * fp, char *fname, int lineno)
{
int fd, flags;
int status;
/* Block signals: */
_thread_kern_sig_block(&status);
if ((fd = fileno(fp)) >= 0) {
if (fp->_flags & __SRW) {
flags = FD_READ | FD_WRITE;
} else {
if (fp->_flags & __SWR) {
flags = FD_WRITE;
} else {
flags = FD_READ;
}
}
/* This might fail but POSIX doesn't give a damn. */
_thread_fd_lock(fd, flags, NULL, fname, lineno);
}
/* Unblock signals: */
_thread_kern_sig_unblock(status);
return;
}
int
_thread_ftrylockfile(FILE * fp)
{
int fd = 0;
int flags;
int status;
if ((fd = fileno(fp)) >= 0) {
/* Block signals: */
_thread_kern_sig_block(&status);
if (fp->_flags & __SRW) {
flags = FD_READ | FD_WRITE;
} else {
if (fp->_flags & __SWR) {
flags = FD_WRITE;
} else {
flags = FD_READ;
}
}
if (!(_thread_fd_table[fd]->r_owner && _thread_fd_table[fd]->w_owner)) {
_thread_fd_lock(fd, flags, NULL, __FILE__, __LINE__);
fd = 0;
} else {
fd = -1;
}
/* Unblock signals: */
_thread_kern_sig_unblock(status);
}
return (fd);
}
void
_thread_funlockfile(FILE * fp)
{
int fd, flags;
int status;
if ((fd = fileno(fp)) >= 0) {
/* Block signals: */
_thread_kern_sig_block(&status);
if (fp->_flags & __SRW) {
flags = FD_READ | FD_WRITE;
} else if (fp->_flags & __SWR) {
flags = FD_WRITE;
} else {
flags = FD_READ;
}
_thread_fd_unlock(fd, flags);
/* Unblock signals: */
_thread_kern_sig_unblock(status);
}
return;
}
#endif