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[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93"; 351573Srgrimes#endif /* LIBC_SCCS and not lint */ 3692986Sobrien#include <sys/cdefs.h> 3792986Sobrien__FBSDID("$FreeBSD$"); 381573Srgrimes 3971579Sdeischen#include "namespace.h" 401573Srgrimes#include <sys/types.h> 411573Srgrimes#include <sys/stat.h> 421573Srgrimes#include <fcntl.h> 43176628Sjhb#include <unistd.h> 441573Srgrimes#include <stdio.h> 451573Srgrimes#include <errno.h> 46176629Sjhb#include <limits.h> 4771579Sdeischen#include "un-namespace.h" 4871579Sdeischen 491573Srgrimes#include "local.h" 501573Srgrimes 511573SrgrimesFILE * 52249810Semastefopen(const char * __restrict file, const char * __restrict mode) 531573Srgrimes{ 5471579Sdeischen FILE *fp; 5571579Sdeischen int f; 561573Srgrimes int flags, oflags; 571573Srgrimes 581573Srgrimes if ((flags = __sflags(mode, &oflags)) == 0) 591573Srgrimes return (NULL); 601573Srgrimes if ((fp = __sfp()) == NULL) 611573Srgrimes return (NULL); 6256698Sjasone if ((f = _open(file, oflags, DEFFILEMODE)) < 0) { 631573Srgrimes fp->_flags = 0; /* release */ 641573Srgrimes return (NULL); 651573Srgrimes } 66176628Sjhb /* 67176628Sjhb * File descriptors are a full int, but _file is only a short. 68176628Sjhb * If we get a valid file descriptor that is greater than 69176628Sjhb * SHRT_MAX, then the fd will get sign-extended into an 70176628Sjhb * invalid file descriptor. Handle this case by failing the 71176628Sjhb * open. 72176628Sjhb */ 73176628Sjhb if (f > SHRT_MAX) { 74178427Sjhb fp->_flags = 0; /* release */ 75176628Sjhb _close(f); 76176628Sjhb errno = EMFILE; 77176628Sjhb return (NULL); 78176628Sjhb } 791573Srgrimes fp->_file = f; 801573Srgrimes fp->_flags = flags; 811573Srgrimes fp->_cookie = fp; 821573Srgrimes fp->_read = __sread; 831573Srgrimes fp->_write = __swrite; 841573Srgrimes fp->_seek = __sseek; 851573Srgrimes fp->_close = __sclose; 861573Srgrimes /* 871573Srgrimes * When opening in append mode, even though we use O_APPEND, 881573Srgrimes * we need to seek to the end so that ftell() gets the right 891573Srgrimes * answer. If the user then alters the seek pointer, or 901573Srgrimes * the file extends, this will fail, but there is not much 911573Srgrimes * we can do about this. (We could set __SAPP and check in 921573Srgrimes * fseek and ftell.) 931573Srgrimes */ 94290544Sache if (oflags & O_APPEND) { 95290544Sache fp->_flags2 |= __S2OAP; 9682807Sache (void)_sseek(fp, (fpos_t)0, SEEK_END); 97290544Sache } 981573Srgrimes return (fp); 991573Srgrimes} 100