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 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <string.h> 27 #include <gelf.h> 28 #include <decl.h> 29 #include <msg.h> 30 31 32 /* 33 * Return number of entries in the section header array, taking 34 * extended headers into account. 35 * 36 * elf_getshnum() and elf_getshstrndx() were defined during the 2002 gABI 37 * meetings. They were supposed to return -1 for failure, and 0 for success. 38 * Our manpage documented them as such, but we then implemented them to 39 * return 0 for failure and 1 for success. This makes elf_getshnum() and 40 * elf_getshstrnum() non-portable to systems that implement the 2002 gABI 41 * definition. 42 * 43 * In 2005, the manpage was modified to match the code. 44 * In 2009, the discrepency was identified. elf_getshdrnum() and 45 * elf_getshdrstrndx() were created to provide a portable implementation. 46 * The older two functions are considered to be obsolete, and are retained 47 * for backward compatability. 48 */ 49 50 int 51 elf_getshdrnum(Elf *elf, size_t *shnum) 52 { 53 GElf_Ehdr ehdr; 54 Elf_Scn *scn; 55 GElf_Shdr shdr0; 56 57 if (gelf_getehdr(elf, &ehdr) == 0) 58 return (-1); 59 if (ehdr.e_shnum > 0) { 60 *shnum = ehdr.e_shnum; 61 return (0); 62 } 63 if ((ehdr.e_shnum == 0) && (ehdr.e_shoff == 0)) { 64 *shnum = 0; 65 return (0); 66 } 67 if ((scn = elf_getscn(elf, 0)) == 0) 68 return (-1); 69 if (gelf_getshdr(scn, &shdr0) == 0) 70 return (-1); 71 *shnum = shdr0.sh_size; 72 return (0); 73 } 74 75 int 76 elf_getshnum(Elf *elf, size_t *shnum) 77 { 78 return (elf_getshdrnum(elf, shnum) == 0); 79 } 80