thr_fcntl.c revision 13546
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 <stdarg.h> 34#include <fcntl.h> 35#ifdef _THREAD_SAFE 36#include <pthread.h> 37#include "pthread_private.h" 38 39int 40fcntl(int fd, int cmd,...) 41{ 42 int flags = 0; 43 int oldfd; 44 int ret; 45 int status; 46 va_list ap; 47 48 /* Block signals: */ 49 _thread_kern_sig_block(&status); 50 51 /* Lock the file descriptor: */ 52 if ((ret = _thread_fd_lock(fd, FD_RDWR, NULL, __FILE__, __LINE__)) == 0) { 53 /* Initialise the variable argument list: */ 54 va_start(ap, cmd); 55 56 /* Process according to file control command type: */ 57 switch (cmd) { 58 /* Duplicate a file descriptor: */ 59 case F_DUPFD: 60 /* 61 * Get the file descriptor that the caller wants to 62 * use: 63 */ 64 oldfd = va_arg(ap, int); 65 66 /* Initialise the file descriptor table entry: */ 67 if ((ret = _thread_sys_fcntl(fd, cmd, oldfd)) < 0) { 68 } 69 /* Initialise the file descriptor table entry: */ 70 else if (_thread_fd_table_init(ret) != 0) { 71 /* Quietly close the file: */ 72 _thread_sys_close(ret); 73 74 /* Reset the file descriptor: */ 75 ret = -1; 76 } else { 77 /* 78 * Save the file open flags so that they can 79 * be checked later: 80 */ 81 _thread_fd_table[ret]->flags = _thread_fd_table[fd]->flags; 82 } 83 break; 84 case F_SETFD: 85 break; 86 case F_GETFD: 87 break; 88 case F_GETFL: 89 ret = _thread_fd_table[fd]->flags; 90 break; 91 case F_SETFL: 92 flags = va_arg(ap, int); 93 if ((ret = _thread_sys_fcntl(fd, cmd, flags | O_NONBLOCK)) == 0) { 94 _thread_fd_table[fd]->flags = flags; 95 } 96 break; 97 default: 98 /* Might want to make va_arg use a union */ 99 ret = _thread_sys_fcntl(fd, cmd, va_arg(ap, void *)); 100 break; 101 } 102 103 /* Free variable arguments: */ 104 va_end(ap); 105 106 /* Unlock the file descriptor: */ 107 _thread_fd_unlock(fd, FD_RDWR); 108 } 109 /* Unblock signals: */ 110 _thread_kern_sig_unblock(status); 111 112 /* Return the completion status: */ 113 return (ret); 114} 115#endif 116