11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Chris Torek. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 16249808Semaste * 3. Neither the name of the University nor the names of its contributors 171573Srgrimes * may be used to endorse or promote products derived from this software 181573Srgrimes * without specific prior written permission. 191573Srgrimes * 201573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301573Srgrimes * SUCH DAMAGE. 311573Srgrimes */ 321573Srgrimes 331573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 341573Srgrimesstatic char sccsid[] = "@(#)fdopen.c 8.1 (Berkeley) 6/4/93"; 351573Srgrimes#endif /* LIBC_SCCS and not lint */ 3692986Sobrien#include <sys/cdefs.h> 3792986Sobrien__FBSDID("$FreeBSD: releng/10.3/lib/libc/stdio/fdopen.c 291293 2015-11-25 08:19:01Z ngie $"); 381573Srgrimes 3971579Sdeischen#include "namespace.h" 401573Srgrimes#include <sys/types.h> 411573Srgrimes#include <fcntl.h> 421573Srgrimes#include <unistd.h> 431573Srgrimes#include <stdio.h> 441573Srgrimes#include <errno.h> 45176629Sjhb#include <limits.h> 4671579Sdeischen#include "un-namespace.h" 471573Srgrimes#include "local.h" 481573Srgrimes 491573SrgrimesFILE * 50249810Semastefdopen(int fd, const char *mode) 511573Srgrimes{ 5292889Sobrien FILE *fp; 531573Srgrimes int flags, oflags, fdflags, tmp; 541573Srgrimes 55176628Sjhb /* 56176628Sjhb * File descriptors are a full int, but _file is only a short. 57176628Sjhb * If we get a valid file descriptor that is greater than 58176628Sjhb * SHRT_MAX, then the fd will get sign-extended into an 59176628Sjhb * invalid file descriptor. Handle this case by failing the 60176628Sjhb * open. 61176628Sjhb */ 62176628Sjhb if (fd > SHRT_MAX) { 63176628Sjhb errno = EMFILE; 64176628Sjhb return (NULL); 65176628Sjhb } 66176628Sjhb 671573Srgrimes if ((flags = __sflags(mode, &oflags)) == 0) 681573Srgrimes return (NULL); 691573Srgrimes 701573Srgrimes /* Make sure the mode the user wants is a subset of the actual mode. */ 7156698Sjasone if ((fdflags = _fcntl(fd, F_GETFL, 0)) < 0) 721573Srgrimes return (NULL); 73291293Sngie /* Work around incorrect O_ACCMODE. */ 74291293Sngie tmp = fdflags & (O_ACCMODE | O_EXEC); 751573Srgrimes if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { 761573Srgrimes errno = EINVAL; 771573Srgrimes return (NULL); 781573Srgrimes } 791573Srgrimes 801573Srgrimes if ((fp = __sfp()) == NULL) 811573Srgrimes return (NULL); 82243731Sjilles 83243731Sjilles if ((oflags & O_CLOEXEC) && _fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) { 84243731Sjilles fp->_flags = 0; 85243731Sjilles return (NULL); 86243731Sjilles } 87243731Sjilles 881573Srgrimes fp->_flags = flags; 891573Srgrimes /* 901573Srgrimes * If opened for appending, but underlying descriptor does not have 9182807Sache * O_APPEND bit set, assert __SAPP so that __swrite() caller 9282807Sache * will _sseek() to the end before write. 931573Srgrimes */ 94290544Sache if (fdflags & O_APPEND) 95290544Sache fp->_flags2 |= __S2OAP; 96290544Sache else if (oflags & O_APPEND) 971573Srgrimes fp->_flags |= __SAPP; 981573Srgrimes fp->_file = fd; 991573Srgrimes fp->_cookie = fp; 1001573Srgrimes fp->_read = __sread; 1011573Srgrimes fp->_write = __swrite; 1021573Srgrimes fp->_seek = __sseek; 1031573Srgrimes fp->_close = __sclose; 1041573Srgrimes return (fp); 1051573Srgrimes} 106