d8b5986dd6
at file flags and replace it with functions that will avoid null pointer checks. MFC to be done by archie ;-) PR: 42100 Reviewed by: archie, robert MFC after: 3 days
148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/*
|
|
* Copyright (c) 1995-1998 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. 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/uio.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
__weak_reference(__write, write);
|
|
|
|
ssize_t
|
|
_write(int fd, const void *buf, size_t nbytes)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
int blocking;
|
|
int type;
|
|
ssize_t n;
|
|
ssize_t num = 0;
|
|
ssize_t ret;
|
|
|
|
/* POSIX says to do just this: */
|
|
if (nbytes == 0)
|
|
return (0);
|
|
|
|
/* Lock the file descriptor for write: */
|
|
if ((ret = _FD_LOCK(fd, FD_WRITE, NULL)) == 0) {
|
|
/* Get the read/write mode type: */
|
|
type = _thread_fd_getflags(fd) & O_ACCMODE;
|
|
|
|
/* Check if the file is not open for write: */
|
|
if (type != O_WRONLY && type != O_RDWR) {
|
|
/* File is not open for write: */
|
|
errno = EBADF;
|
|
_FD_UNLOCK(fd, FD_WRITE);
|
|
return (-1);
|
|
}
|
|
|
|
/* Check if file operations are to block */
|
|
blocking = ((_thread_fd_getflags(fd) & O_NONBLOCK) == 0);
|
|
|
|
/*
|
|
* Loop while no error occurs and until the expected number
|
|
* of bytes are written if performing a blocking write:
|
|
*/
|
|
while (ret == 0) {
|
|
/* Perform a non-blocking write syscall: */
|
|
n = __sys_write(fd, buf + num, nbytes - num);
|
|
|
|
/* Check if one or more bytes were written: */
|
|
if (n > 0)
|
|
/*
|
|
* Keep a count of the number of bytes
|
|
* written:
|
|
*/
|
|
num += n;
|
|
|
|
/*
|
|
* If performing a blocking write, check if the
|
|
* write would have blocked or if some bytes
|
|
* were written but there are still more to
|
|
* write:
|
|
*/
|
|
if (blocking && ((n < 0 && (errno == EWOULDBLOCK ||
|
|
errno == EAGAIN)) || (n >= 0 && num < nbytes))) {
|
|
curthread->data.fd.fd = fd;
|
|
_thread_kern_set_timeout(NULL);
|
|
|
|
/* Reset the interrupted operation flag: */
|
|
curthread->interrupted = 0;
|
|
|
|
_thread_kern_sched_state(PS_FDW_WAIT,
|
|
__FILE__, __LINE__);
|
|
|
|
/*
|
|
* Check if the operation was
|
|
* interrupted by a signal
|
|
*/
|
|
if (curthread->interrupted) {
|
|
/* Return an error: */
|
|
ret = -1;
|
|
}
|
|
|
|
/*
|
|
* If performing a non-blocking write or if an
|
|
* error occurred, just return whatever the write
|
|
* syscall did:
|
|
*/
|
|
} else if (!blocking || n < 0) {
|
|
/* A non-blocking call might return zero: */
|
|
ret = n;
|
|
break;
|
|
|
|
/* Check if the write has completed: */
|
|
} else if (num >= nbytes)
|
|
/* Return the number of bytes written: */
|
|
ret = num;
|
|
}
|
|
_FD_UNLOCK(fd, FD_WRITE);
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
ssize_t
|
|
__write(int fd, const void *buf, size_t nbytes)
|
|
{
|
|
ssize_t ret;
|
|
|
|
_thread_enter_cancellation_point();
|
|
ret = _write(fd, buf, nbytes);
|
|
_thread_leave_cancellation_point();
|
|
|
|
return ret;
|
|
}
|