1/*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its 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 THE REGENTS 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#ifdef VARIANT_DARWINEXTSN 34#define _DARWIN_UNLIMITED_STREAMS 35#define COUNT 0 36#elif defined(VARIANT_LEGACY) 37#define COUNT 0 38#else 39#define COUNT 1 40#endif 41 42#if defined(LIBC_SCCS) && !defined(lint) 43static char sccsid[] = "@(#)fdopen.c 8.1 (Berkeley) 6/4/93"; 44#endif /* LIBC_SCCS and not lint */ 45#include <sys/cdefs.h> 46__FBSDID("$FreeBSD: src/lib/libc/stdio/fdopen.c,v 1.11 2008/05/10 18:39:20 antoine Exp $"); 47 48#include "namespace.h" 49#include <sys/types.h> 50#include <fcntl.h> 51#include <unistd.h> 52#include <stdio.h> 53#include <errno.h> 54#include <limits.h> 55#include "un-namespace.h" 56#include "local.h" 57 58FILE * 59fdopen(fd, mode) 60 int fd; 61 const char *mode; 62{ 63 FILE *fp; 64 int flags, oflags, fdflags, tmp; 65 66 /* 67 * File descriptors are a full int, but _file is only a short. 68 * If we get a valid file descriptor that is greater than 69 * SHRT_MAX, then the fd will get sign-extended into an 70 * invalid file descriptor. Handle this case by failing the 71 * open. 72 */ 73 if (fd > SHRT_MAX) { 74 errno = EMFILE; 75 return (NULL); 76 } 77 78 if ((flags = __sflags(mode, &oflags)) == 0) 79 return (NULL); 80 81 /* Make sure the mode the user wants is a subset of the actual mode. */ 82 if ((fdflags = _fcntl(fd, F_GETFL, 0)) < 0) 83 return (NULL); 84 tmp = fdflags & O_ACCMODE; 85 if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { 86 errno = EINVAL; 87 return (NULL); 88 } 89 90 if ((fp = __sfp(COUNT)) == NULL) 91 return (NULL); 92 fp->_flags = flags; 93 /* 94 * If opened for appending, but underlying descriptor does not have 95 * O_APPEND bit set, assert __SAPP so that __swrite() caller 96 * will _sseek() to the end before write. 97 */ 98 if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) 99 fp->_flags |= __SAPP; 100 fp->_file = fd; 101 fp->_cookie = fp; 102 fp->_read = __sread; 103 fp->_write = __swrite; 104 fp->_seek = __sseek; 105 fp->_close = __sclose; 106 return (fp); 107} 108