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3c165ef7b7
in the file descriptor table are exactly what the kernel knows subject to the O_NONBLOCK flag being requested by the user.
143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
/*
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* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
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* All rights reserved.
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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 John Birrell.
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* 4. Neither the name of the author nor the names of any co-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 JOHN BIRRELL 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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*/
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#include <stdarg.h>
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#include <unistd.h>
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#include <fcntl.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include "pthread_private.h"
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int
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fcntl(int fd, int cmd,...)
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{
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int flags = 0;
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int nonblock;
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int oldfd;
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int ret;
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int status;
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va_list ap;
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/* Lock the file descriptor: */
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if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 0) {
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/* Initialise the variable argument list: */
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va_start(ap, cmd);
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/* Process according to file control command type: */
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switch (cmd) {
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/* Duplicate a file descriptor: */
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case F_DUPFD:
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/*
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* Get the file descriptor that the caller wants to
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* use:
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*/
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oldfd = va_arg(ap, int);
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/* Initialise the file descriptor table entry: */
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if ((ret = _thread_sys_fcntl(fd, cmd, oldfd)) < 0) {
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}
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/* Initialise the file descriptor table entry: */
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else if (_thread_fd_table_init(ret) != 0) {
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/* Quietly close the file: */
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_thread_sys_close(ret);
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/* Reset the file descriptor: */
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ret = -1;
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} else {
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/*
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* Save the file open flags so that they can
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* be checked later:
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*/
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_thread_fd_table[ret]->flags = _thread_fd_table[fd]->flags;
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}
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break;
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case F_SETFD:
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flags = va_arg(ap, int);
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ret = _thread_sys_fcntl(fd, cmd, flags);
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break;
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case F_GETFD:
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ret = _thread_sys_fcntl(fd, cmd, 0);
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break;
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case F_GETFL:
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ret = _thread_fd_table[fd]->flags;
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break;
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case F_SETFL:
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/*
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* Get the file descriptor flags passed by the
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* caller:
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*/
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flags = va_arg(ap, int);
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/*
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* Check if the user wants a non-blocking file
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* descriptor:
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*/
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nonblock = flags & O_NONBLOCK;
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/* Set the file descriptor flags: */
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if ((ret = _thread_sys_fcntl(fd, cmd, flags | O_NONBLOCK)) != 0) {
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/* Get the flags so that we behave like the kernel: */
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} else if ((flags = _thread_sys_fcntl(fd,
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F_GETFL, 0)) == -1) {
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/* Error getting flags: */
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ret = -1;
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/*
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* Check if the file descriptor is non-blocking
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* with respect to the user:
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*/
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} else if (nonblock)
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/* A non-blocking descriptor: */
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_thread_fd_table[fd]->flags = flags | O_NONBLOCK;
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else
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/* Save the flags: */
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_thread_fd_table[fd]->flags = flags & ~O_NONBLOCK;
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break;
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default:
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/* Might want to make va_arg use a union */
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ret = _thread_sys_fcntl(fd, cmd, va_arg(ap, void *));
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break;
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}
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/* Free variable arguments: */
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va_end(ap);
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/* Unlock the file descriptor: */
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_FD_UNLOCK(fd, FD_RDWR);
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}
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/* Return the completion status: */
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return (ret);
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}
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#endif
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