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/* $OpenBSD: fdopen.c,v 1.9 2016/03/20 00:01:21 krw Exp $ */ |
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/*- |
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* Copyright (c) 1990, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* This code is derived from software contributed to Berkeley by |
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* Chris Torek. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/types.h> |
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#include <fcntl.h> |
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#include <limits.h> |
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#include <unistd.h> |
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#include <stdio.h> |
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#include <errno.h> |
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#include "local.h" |
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FILE * |
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fdopen(int fd, const char *mode) |
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{ |
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FILE *fp; |
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int flags, oflags, fdflags, tmp; |
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/* _file is only a short */ |
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✗✓ |
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if (fd > SHRT_MAX) { |
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errno = EMFILE; |
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return (NULL); |
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} |
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✗✓ |
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if ((flags = __sflags(mode, &oflags)) == 0) |
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return (NULL); |
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/* Make sure the mode the user wants is a subset of the actual mode. */ |
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if ((fdflags = fcntl(fd, F_GETFL)) < 0) |
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return (NULL); |
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tmp = fdflags & O_ACCMODE; |
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✗✓✗✗
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if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { |
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errno = EINVAL; |
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return (NULL); |
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} |
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✗✓ |
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if ((fp = __sfp()) == NULL) |
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return (NULL); |
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fp->_flags = flags; |
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/* |
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* If opened for appending, but underlying descriptor does not have |
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* O_APPEND bit set, assert __SAPP so that __swrite() will lseek to |
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* end before each write. |
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*/ |
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if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) |
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fp->_flags |= __SAPP; |
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/* |
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* If close-on-exec was requested, then turn it on if not already |
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*/ |
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if ((oflags & O_CLOEXEC) && !((tmp = fcntl(fd, F_GETFD)) & FD_CLOEXEC)) |
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fcntl(fd, F_SETFD, tmp | FD_CLOEXEC); |
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fp->_file = fd; |
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fp->_cookie = fp; |
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fp->_read = __sread; |
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fp->_write = __swrite; |
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fp->_seek = __sseek; |
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fp->_close = __sclose; |
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return (fp); |
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} |
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DEF_WEAK(fdopen); |