1  /*-
 2   * Copyright (c) 2006,2008 Joseph Koshy
 3   * All rights reserved.
 4   *
 5   * Redistribution and use in source and binary forms, with or without
 6   * modification, are permitted provided that the following conditions
 7   * are met:
 8   * 1. Redistributions of source code must retain the above copyright
 9   *    notice, this list of conditions and the following disclaimer.
10   * 2. Redistributions in binary form must reproduce the above copyright
11   *    notice, this list of conditions and the following disclaimer in the
12   *    documentation and/or other materials provided with the distribution.
13   *
14   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24   * SUCH DAMAGE.
25   */
26  
27  #include <libelf.h>
28  
29  #include "_libelf.h"
30  
31  ELFTC_VCSID("$Id$");
32  
33  int
34  elf_cntl(Elf *e, Elf_Cmd c)
35  {
36  	if (e == NULL ||
37  	    (c != ELF_C_FDDONE && c != ELF_C_FDREAD)) {
38  		LIBELF_SET_ERROR(ARGUMENT, 0);
39  		return (-1);
40  	}
41  
42  	if (e->e_parent) {
43  		LIBELF_SET_ERROR(ARCHIVE, 0);
44  		return (-1);
45  	}
46  
47  	if (c == ELF_C_FDREAD) {
48  		if (e->e_cmd == ELF_C_WRITE) {
49  			LIBELF_SET_ERROR(MODE, 0);
50  			return (-1);
51  		}
52  		else
53  			return (0);
54  	}
55  
56  	e->e_fd = -1;
57  	return 0;
58  }