xref: /illumos-gate/usr/src/cmd/sgs/libelf/common/rawput.c (revision 7257d1b4)
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 #include <stdlib.h>
33 #include <unistd.h>
34 #include <errno.h>
35 #include "libelf.h"
36 #include "decl.h"
37 #include "msg.h"
38 
39 
40 /*
41  * Raw file input/output
42  * Read pieces of input files.
43  */
44 
45 
46 char *
47 _elf_read(int fd, off_t off, size_t fsz)
48 {
49 	char		*p;
50 
51 	if (fsz == 0)
52 		return (0);
53 
54 	if (fd == -1) {
55 		_elf_seterr(EREQ_NOFD, 0);
56 		return (0);
57 	}
58 
59 	if (lseek(fd, off, 0) != off) {
60 		_elf_seterr(EIO_SEEK, errno);
61 		return (0);
62 	}
63 	if ((p = (char *)malloc(fsz)) == 0) {
64 		_elf_seterr(EMEM_DATA, errno);
65 		return (0);
66 	}
67 
68 	if (read(fd, p, fsz) != fsz) {
69 		_elf_seterr(EIO_READ, errno);
70 		free(p);
71 		return (0);
72 	}
73 	return (p);
74 }
75