thr_fcntl.c revision 103388
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 AUTHOR 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 * $FreeBSD: head/lib/libkse/thread/thr_fcntl.c 103388 2002-09-16 08:45:36Z mini $ 33 */ 34#include <stdarg.h> 35#include <unistd.h> 36#include <fcntl.h> 37#include <pthread.h> 38#include "thr_private.h" 39 40__weak_reference(__fcntl, fcntl); 41 42int 43_fcntl(int fd, int cmd,...) 44{ 45 int flags = 0; 46 int nonblock; 47 int oldfd; 48 int ret; 49 va_list ap; 50 51 /* Lock the file descriptor: */ 52 if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) == 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 = __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 __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_setflags(ret, 82 _thread_fd_getflags(fd)); 83 } 84 break; 85 case F_SETFD: 86 flags = va_arg(ap, int); 87 ret = __sys_fcntl(fd, cmd, flags); 88 break; 89 case F_GETFD: 90 ret = __sys_fcntl(fd, cmd, 0); 91 break; 92 case F_GETFL: 93 ret = _thread_fd_getflags(fd); 94 break; 95 case F_SETFL: 96 /* 97 * Get the file descriptor flags passed by the 98 * caller: 99 */ 100 flags = va_arg(ap, int); 101 102 /* 103 * Check if the user wants a non-blocking file 104 * descriptor: 105 */ 106 nonblock = flags & O_NONBLOCK; 107 108 /* Set the file descriptor flags: */ 109 if ((ret = __sys_fcntl(fd, cmd, flags | O_NONBLOCK)) != 0) { 110 111 /* Get the flags so that we behave like the kernel: */ 112 } else if ((flags = __sys_fcntl(fd, 113 F_GETFL, 0)) == -1) { 114 /* Error getting flags: */ 115 ret = -1; 116 117 /* 118 * Check if the file descriptor is non-blocking 119 * with respect to the user: 120 */ 121 } else if (nonblock) 122 /* A non-blocking descriptor: */ 123 _thread_fd_setflags(fd, flags | O_NONBLOCK); 124 else 125 /* Save the flags: */ 126 _thread_fd_setflags(fd, flags & ~O_NONBLOCK); 127 break; 128 default: 129 /* Might want to make va_arg use a union */ 130 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 131 break; 132 } 133 134 /* Free variable arguments: */ 135 va_end(ap); 136 137 /* Unlock the file descriptor: */ 138 _FD_UNLOCK(fd, FD_RDWR); 139 } 140 /* Return the completion status: */ 141 return (ret); 142} 143 144int 145__fcntl(int fd, int cmd,...) 146{ 147 int ret; 148 va_list ap; 149 150 _thread_enter_cancellation_point(); 151 152 va_start(ap, cmd); 153 switch (cmd) { 154 case F_DUPFD: 155 case F_SETFD: 156 case F_SETFL: 157 ret = _fcntl(fd, cmd, va_arg(ap, int)); 158 break; 159 case F_GETFD: 160 case F_GETFL: 161 ret = _fcntl(fd, cmd); 162 break; 163 default: 164 ret = _fcntl(fd, cmd, va_arg(ap, void *)); 165 } 166 va_end(ap); 167 168 _thread_leave_cancellation_point(); 169 170 return ret; 171} 172