thr_write.c revision 22315
1/* 2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 */ 33#include <sys/types.h> 34#include <sys/fcntl.h> 35#include <sys/uio.h> 36#include <errno.h> 37#include <unistd.h> 38#ifdef _THREAD_SAFE 39#include <pthread.h> 40#include "pthread_private.h" 41 42ssize_t 43write(int fd, const void *buf, size_t nbytes) 44{ 45 int ret; 46 int status; 47 48 /* Lock the file descriptor for read and write: */ 49 if ((ret = _thread_fd_lock(fd, FD_RDWR, NULL, 50 __FILE__, __LINE__)) == 0) { 51 /* Perform a non-blocking write syscall: */ 52 while ((ret = _thread_sys_write(fd, buf, nbytes)) < 0) { 53 if (_thread_fd_table[fd]->flags & O_NONBLOCK == 0 && 54 (errno == EWOULDBLOCK || errno == EAGAIN)) { 55 _thread_kern_sig_block(&status); 56 _thread_run->data.fd.fd = fd; 57 _thread_kern_set_timeout(NULL); 58 59 /* Reset the interrupted operation flag: */ 60 _thread_run->interrupted = 0; 61 62 _thread_kern_sched_state(PS_FDW_WAIT, 63 __FILE__, __LINE__); 64 65 /* 66 * Check if the operation was 67 * interrupted by a signal 68 */ 69 if (_thread_run->interrupted) { 70 ret = -1; 71 break; 72 } 73 } else { 74 break; 75 } 76 } 77 _thread_fd_unlock(fd, FD_RDWR); 78 } 79 return (ret); 80} 81#endif 82