elf_end.c revision 256281
1/*- 2 * Copyright (c) 2006 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 <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/10/lib/libelf/elf_end.c 164190 2006-11-11 17:16:35Z jkoshy $"); 29 30#include <sys/mman.h> 31 32#include <assert.h> 33#include <libelf.h> 34#include <stdlib.h> 35 36#include "_libelf.h" 37 38int 39elf_end(Elf *e) 40{ 41 Elf *sv; 42 Elf_Scn *scn, *tscn; 43 44 if (e == NULL || e->e_activations == 0) 45 return (0); 46 47 if (--e->e_activations > 0) 48 return (e->e_activations); 49 50 assert(e->e_activations == 0); 51 52 while (e && e->e_activations == 0) { 53 switch (e->e_kind) { 54 case ELF_K_AR: 55 /* 56 * If we still have open child descriptors, we 57 * need to defer reclaiming resources till all 58 * the child descriptors for the archive are 59 * closed. 60 */ 61 if (e->e_u.e_ar.e_nchildren > 0) 62 return (0); 63 break; 64 case ELF_K_ELF: 65 /* 66 * Reclaim all section descriptors. 67 */ 68 STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next, tscn) 69 scn = _libelf_release_scn(scn); 70 break; 71 case ELF_K_NUM: 72 assert(0); 73 default: 74 break; 75 } 76 77 if (e->e_flags & LIBELF_F_MMAP) 78 (void) munmap(e->e_rawfile, e->e_rawsize); 79 80 sv = e; 81 if ((e = e->e_parent) != NULL) 82 e->e_u.e_ar.e_nchildren--; 83 sv = _libelf_release_elf(sv); 84 } 85 86 return (0); 87} 88 89