1 /* Create descriptor from file descriptor for processing file. 2 Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2002. 5 6 Red Hat elfutils is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by the 8 Free Software Foundation; version 2 of the License. 9 10 Red Hat elfutils is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 General Public License for more details. 14 15 You should have received a copy of the GNU General Public License along 16 with Red Hat elfutils; if not, write to the Free Software Foundation, 17 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 18 19 In addition, as a special exception, Red Hat, Inc. gives You the 20 additional right to link the code of Red Hat elfutils with code licensed 21 under any Open Source Initiative certified open source license 22 (http://www.opensource.org/licenses/index.php) which requires the 23 distribution of source code with any binary distribution and to 24 distribute linked combinations of the two. Non-GPL Code permitted under 25 this exception must only link to the code of Red Hat elfutils through 26 those well defined interfaces identified in the file named EXCEPTION 27 found in the source code files (the "Approved Interfaces"). The files 28 of Non-GPL Code may instantiate templates or use macros or inline 29 functions from the Approved Interfaces without causing the resulting 30 work to be covered by the GNU General Public License. Only Red Hat, 31 Inc. may make changes or additions to the list of Approved Interfaces. 32 Red Hat's grant of this exception is conditioned upon your not adding 33 any new exceptions. If you wish to add a new Approved Interface or 34 exception, please contact Red Hat. You must obey the GNU General Public 35 License in all respects for all of the Red Hat elfutils code and other 36 code used in conjunction with Red Hat elfutils except the Non-GPL Code 37 covered by this exception. If you modify this file, you may extend this 38 exception to your version of the file, but you are not obligated to do 39 so. If you do not wish to provide this exception without modification, 40 you must delete this exception statement from your version and license 41 this file solely under the GPL without exception. 42 43 Red Hat elfutils is an included package of the Open Invention Network. 44 An included package of the Open Invention Network is a package for which 45 Open Invention Network licensees cross-license their patents. No patent 46 license is granted, either expressly or impliedly, by designation as an 47 included package. Should you wish to participate in the Open Invention 48 Network licensing program, please visit www.openinventionnetwork.com 49 <http://www.openinventionnetwork.com>. */ 50 51 #ifdef HAVE_CONFIG_H 52 # include <config.h> 53 #endif 54 55 #include <errno.h> 56 #include <stddef.h> 57 #include <sys/stat.h> 58 59 #include <libdwP.h> 60 61 62 Dwarf * 63 dwarf_begin (fd, cmd) 64 int fd; 65 Dwarf_Cmd cmd; 66 { 67 Elf *elf; 68 Elf_Cmd elfcmd; 69 Dwarf *result = NULL; 70 71 switch (cmd) 72 { 73 case DWARF_C_READ: 74 elfcmd = ELF_C_READ_MMAP; 75 break; 76 case DWARF_C_WRITE: 77 elfcmd = ELF_C_WRITE; 78 break; 79 case DWARF_C_RDWR: 80 elfcmd = ELF_C_RDWR; 81 break; 82 default: 83 /* No valid mode. */ 84 __libdw_seterrno (DWARF_E_INVALID_CMD); 85 return NULL; 86 } 87 88 /* We have to call `elf_version' here since the user might have not 89 done it or initialized libelf with a different version. This 90 would break libdwarf since we are using the ELF data structures 91 in a certain way. */ 92 elf_version (EV_CURRENT); 93 94 /* Get an ELF descriptor. */ 95 elf = elf_begin (fd, elfcmd, NULL); 96 if (elf == NULL) 97 /* ANDROID_CHANGE_BEGIN */ 98 { 99 #if 0 100 /* Test why the `elf_begin" call failed. */ 101 struct stat64 st; 102 103 if (fstat64 (fd, &st) == 0 && ! S_ISREG (st.st_mode)) 104 __libdw_seterrno (DWARF_E_NO_REGFILE); 105 else if (errno == EBADF) 106 __libdw_seterrno (DWARF_E_INVALID_FILE); 107 else 108 __libdw_seterrno (DWARF_E_IO_ERROR); 109 #else 110 __libdw_seterrno (DWARF_E_IO_ERROR); 111 #endif 112 /* ANDROID_CHANGE_END */ 113 } 114 else 115 { 116 /* Do the real work now that we have an ELF descriptor. */ 117 result = INTUSE(dwarf_begin_elf) (elf, cmd, NULL); 118 119 /* If this failed, free the resources. */ 120 if (result == NULL) 121 elf_end (elf); 122 else 123 result->free_elf = true; 124 } 125 126 return result; 127 } 128
