Home | History | Annotate | Download | only in stdio
      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 /*
     33  * Unix routine to do an "fopen" on file descriptor
     34  * The mode has to be repeated because you can't query its
     35  * status
     36  */
     37 
     38 #define	_LARGEFILE64_SOURCE 1
     39 
     40 #pragma weak _fdopen = fdopen
     41 
     42 #include "lint.h"
     43 #include <mtlib.h>
     44 #include "file64.h"
     45 #include <sys/types.h>
     46 #include <unistd.h>
     47 #include <stdio.h>
     48 #include <limits.h>
     49 #include <thread.h>
     50 #include <synch.h>
     51 #include "stdiom.h"
     52 #include <errno.h>
     53 #include <fcntl.h>
     54 
     55 FILE *
     56 fdopen(int fd, const char *type) /* associate file desc. with stream */
     57 {
     58 	/* iop doesn't need locking since this function is creating it */
     59 	FILE *iop;
     60 	char plus;
     61 	unsigned char flag;
     62 
     63 	/* Sets EBADF for bad fds */
     64 	if (fcntl(fd, F_GETFD) == -1)
     65 		return (NULL);
     66 
     67 	if ((iop = _findiop()) == 0) {
     68 		errno = ENOMEM;
     69 		return (NULL);
     70 	}
     71 
     72 	switch (type[0]) {
     73 	default:
     74 		iop->_flag = 0; /* release iop */
     75 		errno = EINVAL;
     76 		return (NULL);
     77 	case 'r':
     78 		flag = _IOREAD;
     79 		break;
     80 	case 'a':
     81 		(void) lseek64(fd, (off64_t)0, SEEK_END);
     82 		/*FALLTHROUGH*/
     83 	case 'w':
     84 		flag = _IOWRT;
     85 		break;
     86 	}
     87 	if ((plus = type[1]) == 'b')	/* Unix ignores 'b' ANSI std */
     88 		plus = type[2];
     89 	if (plus == '+')
     90 		flag = _IORW;
     91 	iop->_flag = flag;
     92 
     93 #ifdef	_LP64
     94 	iop->_file = fd;
     95 #else
     96 	if (fd <= _FILE_FD_MAX) {
     97 		SET_FILE(iop, fd);
     98 	} else if (_file_set(iop, fd, type) != 0) {
     99 		/* errno set by _file_set () */
    100 		iop->_flag = 0;		/* release iop */
    101 		return (NULL);
    102 	}
    103 #endif	/*	_LP64	*/
    104 
    105 	return (iop);
    106 }
    107