usr/src/cmd/sgs/libelf/common/rawput.c

   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 }