xref: /illumos-gate/usr/src/lib/libc/port/stdio/fdopen.c (revision e8031f0a8ed0e45c6d8847c5e09424e66fd34a4b)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
57c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
67c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
77c478bd9Sstevel@tonic-gate  * with the License.
87c478bd9Sstevel@tonic-gate  *
97c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
107c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
117c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
127c478bd9Sstevel@tonic-gate  * and limitations under the License.
137c478bd9Sstevel@tonic-gate  *
147c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
157c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
167c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
177c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
187c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
197c478bd9Sstevel@tonic-gate  *
207c478bd9Sstevel@tonic-gate  * CDDL HEADER END
217c478bd9Sstevel@tonic-gate  */
22*e8031f0aSraf 
237c478bd9Sstevel@tonic-gate /*
24*e8031f0aSraf  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
257c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
267c478bd9Sstevel@tonic-gate  */
277c478bd9Sstevel@tonic-gate 
287c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
297c478bd9Sstevel@tonic-gate 
307c478bd9Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
317c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
327c478bd9Sstevel@tonic-gate 
337c478bd9Sstevel@tonic-gate 
347c478bd9Sstevel@tonic-gate /*
357c478bd9Sstevel@tonic-gate  * Unix routine to do an "fopen" on file descriptor
367c478bd9Sstevel@tonic-gate  * The mode has to be repeated because you can't query its
377c478bd9Sstevel@tonic-gate  * status
387c478bd9Sstevel@tonic-gate  */
397c478bd9Sstevel@tonic-gate 
407c478bd9Sstevel@tonic-gate #define	_LARGEFILE64_SOURCE 1
417c478bd9Sstevel@tonic-gate 
427c478bd9Sstevel@tonic-gate #pragma weak fdopen = _fdopen
437c478bd9Sstevel@tonic-gate 
44*e8031f0aSraf #include "synonyms.h"
457c478bd9Sstevel@tonic-gate #include <mtlib.h>
467c478bd9Sstevel@tonic-gate #include "file64.h"
477c478bd9Sstevel@tonic-gate #include <sys/types.h>
487c478bd9Sstevel@tonic-gate #include <unistd.h>
497c478bd9Sstevel@tonic-gate #include <stdio.h>
507c478bd9Sstevel@tonic-gate #include <limits.h>
517c478bd9Sstevel@tonic-gate #include <thread.h>
527c478bd9Sstevel@tonic-gate #include <synch.h>
537c478bd9Sstevel@tonic-gate #include "stdiom.h"
547c478bd9Sstevel@tonic-gate #include <errno.h>
557c478bd9Sstevel@tonic-gate #include <fcntl.h>
567c478bd9Sstevel@tonic-gate 
577c478bd9Sstevel@tonic-gate FILE *
587c478bd9Sstevel@tonic-gate fdopen(int fd, const char *type) /* associate file desc. with stream */
597c478bd9Sstevel@tonic-gate {
607c478bd9Sstevel@tonic-gate 	/* iop doesn't need locking since this function is creating it */
617c478bd9Sstevel@tonic-gate 	FILE *iop;
627c478bd9Sstevel@tonic-gate 	char plus;
637c478bd9Sstevel@tonic-gate 	unsigned char flag;
647c478bd9Sstevel@tonic-gate 
657c478bd9Sstevel@tonic-gate 
667c478bd9Sstevel@tonic-gate 	/* Sets EBADF for bad fds */
677c478bd9Sstevel@tonic-gate 	if (fcntl(fd, F_GETFD) == -1)
687c478bd9Sstevel@tonic-gate 		return (NULL);
697c478bd9Sstevel@tonic-gate 
707c478bd9Sstevel@tonic-gate #ifdef	_LP64
717c478bd9Sstevel@tonic-gate 	if ((iop = _findiop()) == 0) {
727c478bd9Sstevel@tonic-gate 		errno = ENOMEM;
737c478bd9Sstevel@tonic-gate 		return (NULL);
747c478bd9Sstevel@tonic-gate 	}
757c478bd9Sstevel@tonic-gate 	iop->_file = fd;
767c478bd9Sstevel@tonic-gate #else
777c478bd9Sstevel@tonic-gate 	if (fd > UCHAR_MAX) {
787c478bd9Sstevel@tonic-gate 		errno = EMFILE;
797c478bd9Sstevel@tonic-gate 		return (NULL);
807c478bd9Sstevel@tonic-gate 	}
817c478bd9Sstevel@tonic-gate 	if ((iop = _findiop()) == 0) {
827c478bd9Sstevel@tonic-gate 		errno = ENOMEM;
837c478bd9Sstevel@tonic-gate 		return (NULL);
847c478bd9Sstevel@tonic-gate 	}
857c478bd9Sstevel@tonic-gate 	iop->_file = (unsigned char)fd;
867c478bd9Sstevel@tonic-gate #endif	/*	_LP64	*/
877c478bd9Sstevel@tonic-gate 
887c478bd9Sstevel@tonic-gate 	switch (type[0]) {
897c478bd9Sstevel@tonic-gate 	default:
907c478bd9Sstevel@tonic-gate 		iop->_flag = 0; /* release iop */
917c478bd9Sstevel@tonic-gate 		errno = EINVAL;
927c478bd9Sstevel@tonic-gate 		return (NULL);
937c478bd9Sstevel@tonic-gate 	case 'r':
947c478bd9Sstevel@tonic-gate 		flag = _IOREAD;
957c478bd9Sstevel@tonic-gate 		break;
967c478bd9Sstevel@tonic-gate 	case 'a':
977c478bd9Sstevel@tonic-gate 		(void) lseek64(fd, (off64_t)0, SEEK_END);
987c478bd9Sstevel@tonic-gate 		/*FALLTHROUGH*/
997c478bd9Sstevel@tonic-gate 	case 'w':
1007c478bd9Sstevel@tonic-gate 		flag = _IOWRT;
1017c478bd9Sstevel@tonic-gate 		break;
1027c478bd9Sstevel@tonic-gate 	}
1037c478bd9Sstevel@tonic-gate 	if ((plus = type[1]) == 'b')	/* Unix ignores 'b' ANSI std */
1047c478bd9Sstevel@tonic-gate 		plus = type[2];
1057c478bd9Sstevel@tonic-gate 	if (plus == '+')
1067c478bd9Sstevel@tonic-gate 		flag = _IORW;
1077c478bd9Sstevel@tonic-gate 	iop->_flag = flag;
1087c478bd9Sstevel@tonic-gate 
1097c478bd9Sstevel@tonic-gate 	return (iop);
1107c478bd9Sstevel@tonic-gate }
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