xref: /freebsd-10-stable/lib/libkse/thread/thr_write.c

/*
 * 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 <sys/types.h>
#include <sys/fcntl.h>
#include <sys/uio.h>
#include <errno.h>
#include <unistd.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"

ssize_t
write(int fd, const void *buf, size_t nbytes)
{
	int             nonblock;
	int             ret;
	int             status;
	if (fd < 0 || fd > _thread_dtablesize || _thread_fd_table[fd] == NULL) {
		_thread_seterrno(_thread_run, EBADF);
		ret = -1;
	} else if ((nonblock = _thread_fd_table[fd]->flags & O_NONBLOCK) == 0 && (ret = _thread_fd_lock(fd, FD_RDWR, NULL, __FILE__, __LINE__)) != 0) {
		/* Cannot lock file descriptor. */
	} else {
		while ((ret = _thread_sys_write(fd, buf, nbytes)) < 0) {
			if (nonblock == 0 && (errno == EWOULDBLOCK || errno == EAGAIN)) {
				_thread_kern_sig_block(&status);
				_thread_run->data.fd.fd = fd;
				_thread_kern_set_timeout(NULL);
				_thread_kern_sched_state(PS_FDW_WAIT, __FILE__, __LINE__);
				if (errno == EINTR) {
					ret = -1;
					break;
				}
			} else {
				break;
			}
		}
		if (nonblock == 0) {
			_thread_fd_unlock(fd, FD_RDWR);
		}
	}
	return (ret);
}
#endif