thr_fcntl.c revision 35509
1/* 2 * Copyright (c) 1995-1998 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 <unistd.h> 35#include <fcntl.h> 36#ifdef _THREAD_SAFE 37#include <pthread.h> 38#include "pthread_private.h" 39 40int 41fcntl(int fd, int cmd,...) 42{ 43 int flags = 0; 44 int oldfd; 45 int ret; 46 int status; 47 va_list ap; 48 49 /* Lock the file descriptor: */ 50 if ((ret = _thread_fd_lock(fd, FD_RDWR, NULL, __FILE__, __LINE__)) == 0) { 51 /* Initialise the variable argument list: */ 52 va_start(ap, cmd); 53 54 /* Process according to file control command type: */ 55 switch (cmd) { 56 /* Duplicate a file descriptor: */ 57 case F_DUPFD: 58 /* 59 * Get the file descriptor that the caller wants to 60 * use: 61 */ 62 oldfd = va_arg(ap, int); 63 64 /* Initialise the file descriptor table entry: */ 65 if ((ret = _thread_sys_fcntl(fd, cmd, oldfd)) < 0) { 66 } 67 /* Initialise the file descriptor table entry: */ 68 else if (_thread_fd_table_init(ret) != 0) { 69 /* Quietly close the file: */ 70 _thread_sys_close(ret); 71 72 /* Reset the file descriptor: */ 73 ret = -1; 74 } else { 75 /* 76 * Save the file open flags so that they can 77 * be checked later: 78 */ 79 _thread_fd_table[ret]->flags = _thread_fd_table[fd]->flags; 80 } 81 break; 82 case F_SETFD: 83 break; 84 case F_GETFD: 85 break; 86 case F_GETFL: 87 ret = _thread_fd_table[fd]->flags; 88 break; 89 case F_SETFL: 90 flags = va_arg(ap, int); 91 if ((ret = _thread_sys_fcntl(fd, cmd, flags | O_NONBLOCK)) == 0) { 92 _thread_fd_table[fd]->flags = flags; 93 } 94 break; 95 default: 96 /* Might want to make va_arg use a union */ 97 ret = _thread_sys_fcntl(fd, cmd, va_arg(ap, void *)); 98 break; 99 } 100 101 /* Free variable arguments: */ 102 va_end(ap); 103 104 /* Unlock the file descriptor: */ 105 _thread_fd_unlock(fd, FD_RDWR); 106 } 107 108 /* Return the completion status: */ 109 return (ret); 110} 111#endif 112