11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/*	$OpenBSD: fdopen.c,v 1.5 2005/08/08 08:05:36 espie Exp $ */
21dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/*-
31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Copyright (c) 1990, 1993
41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *	The Regents of the University of California.  All rights reserved.
51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *
61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This code is derived from software contributed to Berkeley by
71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Chris Torek.
81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *
91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without
101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions
111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met:
121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 1. Redistributions of source code must retain the above copyright
131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *    notice, this list of conditions and the following disclaimer.
141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright
151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *    notice, this list of conditions and the following disclaimer in the
161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *    documentation and/or other materials provided with the distribution.
171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3. Neither the name of the University nor the names of its contributors
181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *    may be used to endorse or promote products derived from this software
191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *    without specific prior written permission.
201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project *
211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE.
321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */
331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project
341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/types.h>
351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <fcntl.h>
361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <unistd.h>
371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h>
381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <errno.h>
391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "local.h"
401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project
411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source ProjectFILE *
421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectfdopen(int fd, const char *mode)
431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{
441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	FILE *fp;
451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	int flags, oflags, fdflags, tmp;
461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project
471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	if ((flags = __sflags(mode, &oflags)) == 0)
481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project		return (NULL);
491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project
501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	/* Make sure the mode the user wants is a subset of the actual mode. */
511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0)
521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project		return (NULL);
531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	tmp = fdflags & O_ACCMODE;
541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) {
551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project		errno = EINVAL;
561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project		return (NULL);
571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	}
581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project
591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	if ((fp = __sfp()) == NULL)
601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project		return (NULL);
611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	fp->_flags = flags;
621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	/*
631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	 * If opened for appending, but underlying descriptor does not have
641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	 * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to
651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	 * end before each write.
661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	 */
671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project		fp->_flags |= __SAPP;
691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	fp->_file = fd;
701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	fp->_cookie = fp;
711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	fp->_read = __sread;
721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	fp->_write = __swrite;
731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	fp->_seek = __sseek;
741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	fp->_close = __sclose;
751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project	return (fp);
761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project}
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