xref: /illumos-gate/usr/src/lib/libc/port/stdio/fdopen.c (revision 7257d1b4d25bfac0c802847390e98a464fd787ac)
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
5a5f69788Scraigm  * Common Development and Distribution License (the "License").
6a5f69788Scraigm  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
21e8031f0aSraf 
227c478bd9Sstevel@tonic-gate /*
23*7257d1b4Sraf  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
247c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate  */
267c478bd9Sstevel@tonic-gate 
277c478bd9Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
287c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
297c478bd9Sstevel@tonic-gate 
30a5f69788Scraigm #pragma ident	"%Z%%M%	%I%	%E% SMI"
317c478bd9Sstevel@tonic-gate 
327c478bd9Sstevel@tonic-gate /*
337c478bd9Sstevel@tonic-gate  * Unix routine to do an "fopen" on file descriptor
347c478bd9Sstevel@tonic-gate  * The mode has to be repeated because you can't query its
357c478bd9Sstevel@tonic-gate  * status
367c478bd9Sstevel@tonic-gate  */
377c478bd9Sstevel@tonic-gate 
387c478bd9Sstevel@tonic-gate #define	_LARGEFILE64_SOURCE 1
397c478bd9Sstevel@tonic-gate 
40*7257d1b4Sraf #pragma weak _fdopen = fdopen
417c478bd9Sstevel@tonic-gate 
42*7257d1b4Sraf #include "lint.h"
437c478bd9Sstevel@tonic-gate #include <mtlib.h>
447c478bd9Sstevel@tonic-gate #include "file64.h"
457c478bd9Sstevel@tonic-gate #include <sys/types.h>
467c478bd9Sstevel@tonic-gate #include <unistd.h>
477c478bd9Sstevel@tonic-gate #include <stdio.h>
487c478bd9Sstevel@tonic-gate #include <limits.h>
497c478bd9Sstevel@tonic-gate #include <thread.h>
507c478bd9Sstevel@tonic-gate #include <synch.h>
517c478bd9Sstevel@tonic-gate #include "stdiom.h"
527c478bd9Sstevel@tonic-gate #include <errno.h>
537c478bd9Sstevel@tonic-gate #include <fcntl.h>
547c478bd9Sstevel@tonic-gate 
557c478bd9Sstevel@tonic-gate FILE *
567c478bd9Sstevel@tonic-gate fdopen(int fd, const char *type) /* associate file desc. with stream */
577c478bd9Sstevel@tonic-gate {
587c478bd9Sstevel@tonic-gate 	/* iop doesn't need locking since this function is creating it */
597c478bd9Sstevel@tonic-gate 	FILE *iop;
607c478bd9Sstevel@tonic-gate 	char plus;
617c478bd9Sstevel@tonic-gate 	unsigned char flag;
627c478bd9Sstevel@tonic-gate 
637c478bd9Sstevel@tonic-gate 	/* Sets EBADF for bad fds */
647c478bd9Sstevel@tonic-gate 	if (fcntl(fd, F_GETFD) == -1)
657c478bd9Sstevel@tonic-gate 		return (NULL);
667c478bd9Sstevel@tonic-gate 
677c478bd9Sstevel@tonic-gate 	if ((iop = _findiop()) == 0) {
687c478bd9Sstevel@tonic-gate 		errno = ENOMEM;
697c478bd9Sstevel@tonic-gate 		return (NULL);
707c478bd9Sstevel@tonic-gate 	}
717c478bd9Sstevel@tonic-gate 
727c478bd9Sstevel@tonic-gate 	switch (type[0]) {
737c478bd9Sstevel@tonic-gate 	default:
747c478bd9Sstevel@tonic-gate 		iop->_flag = 0; /* release iop */
757c478bd9Sstevel@tonic-gate 		errno = EINVAL;
767c478bd9Sstevel@tonic-gate 		return (NULL);
777c478bd9Sstevel@tonic-gate 	case 'r':
787c478bd9Sstevel@tonic-gate 		flag = _IOREAD;
797c478bd9Sstevel@tonic-gate 		break;
807c478bd9Sstevel@tonic-gate 	case 'a':
817c478bd9Sstevel@tonic-gate 		(void) lseek64(fd, (off64_t)0, SEEK_END);
827c478bd9Sstevel@tonic-gate 		/*FALLTHROUGH*/
837c478bd9Sstevel@tonic-gate 	case 'w':
847c478bd9Sstevel@tonic-gate 		flag = _IOWRT;
857c478bd9Sstevel@tonic-gate 		break;
867c478bd9Sstevel@tonic-gate 	}
877c478bd9Sstevel@tonic-gate 	if ((plus = type[1]) == 'b')	/* Unix ignores 'b' ANSI std */
887c478bd9Sstevel@tonic-gate 		plus = type[2];
897c478bd9Sstevel@tonic-gate 	if (plus == '+')
907c478bd9Sstevel@tonic-gate 		flag = _IORW;
917c478bd9Sstevel@tonic-gate 	iop->_flag = flag;
927c478bd9Sstevel@tonic-gate 
93a5f69788Scraigm #ifdef	_LP64
94a5f69788Scraigm 	iop->_file = fd;
95a5f69788Scraigm #else
96a5f69788Scraigm 	if (fd <= _FILE_FD_MAX) {
97a5f69788Scraigm 		SET_FILE(iop, fd);
98a5f69788Scraigm 	} else if (_file_set(iop, fd, type) != 0) {
99a5f69788Scraigm 		/* errno set by _file_set () */
100a5f69788Scraigm 		iop->_flag = 0;		/* release iop */
101a5f69788Scraigm 		return (NULL);
102a5f69788Scraigm 	}
103a5f69788Scraigm #endif	/*	_LP64	*/
104a5f69788Scraigm 
1057c478bd9Sstevel@tonic-gate 	return (iop);
1067c478bd9Sstevel@tonic-gate }
107