1b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper/* Create descriptor from file descriptor for processing file. 2b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc. 3de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard This file is part of elfutils. 4b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Written by Ulrich Drepper <drepper@redhat.com>, 2002. 5b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 6de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard This file is free software; you can redistribute it and/or modify 7de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard it under the terms of either 8b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 9de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard * the GNU Lesser General Public License as published by the Free 10de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard Software Foundation; either version 3 of the License, or (at 11de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard your option) any later version 12de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 13de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard or 14de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 15de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard * the GNU General Public License as published by the Free 16de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard Software Foundation; either version 2 of the License, or (at 17de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard your option) any later version 18de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 19de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard or both in parallel, as here. 20de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 21de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard elfutils is distributed in the hope that it will be useful, but 22361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper WITHOUT ANY WARRANTY; without even the implied warranty of 23361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper General Public License for more details. 25361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper 26de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard You should have received copies of the GNU General Public License and 27de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard the GNU Lesser General Public License along with this program. If 28de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard not, see <http://www.gnu.org/licenses/>. */ 29b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 30b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#ifdef HAVE_CONFIG_H 31b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper# include <config.h> 32b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#endif 33b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 34b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <errno.h> 35b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <stddef.h> 36b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <sys/stat.h> 37b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 38b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <libdwP.h> 39b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 40b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 41b08d5a8fb42f4586d756068065186b5af7e48daUlrich DrepperDwarf * 421ccdfb683ad6c7e59793136c3a657ddf131cafd1Mark Wielaarddwarf_begin (int fd, Dwarf_Cmd cmd) 43b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper{ 44b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Elf *elf; 45b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Elf_Cmd elfcmd; 46b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Dwarf *result = NULL; 47b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 48b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper switch (cmd) 49b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 50b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper case DWARF_C_READ: 51b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper elfcmd = ELF_C_READ_MMAP; 52b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper break; 53b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper case DWARF_C_WRITE: 54b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper elfcmd = ELF_C_WRITE; 55b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper break; 56b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper case DWARF_C_RDWR: 57b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper elfcmd = ELF_C_RDWR; 58b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper break; 59b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper default: 60b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* No valid mode. */ 61b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libdw_seterrno (DWARF_E_INVALID_CMD); 62b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper return NULL; 63b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 64b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 65b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* We have to call `elf_version' here since the user might have not 66b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper done it or initialized libelf with a different version. This 67b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper would break libdwarf since we are using the ELF data structures 68b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper in a certain way. */ 69b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper elf_version (EV_CURRENT); 70b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 71b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* Get an ELF descriptor. */ 72b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper elf = elf_begin (fd, elfcmd, NULL); 73b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (elf == NULL) 74b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 75b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* Test why the `elf_begin" call failed. */ 763425454a10d307fae891fb667cf7969e945cde79Josh Stone struct stat st; 77b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 783425454a10d307fae891fb667cf7969e945cde79Josh Stone if (fstat (fd, &st) == 0 && ! S_ISREG (st.st_mode)) 79b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libdw_seterrno (DWARF_E_NO_REGFILE); 80b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper else if (errno == EBADF) 81b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libdw_seterrno (DWARF_E_INVALID_FILE); 82b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper else 83b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libdw_seterrno (DWARF_E_IO_ERROR); 84b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 85b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper else 86b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 87b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* Do the real work now that we have an ELF descriptor. */ 88b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result = INTUSE(dwarf_begin_elf) (elf, cmd, NULL); 89b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 90b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* If this failed, free the resources. */ 91b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (result == NULL) 92b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper elf_end (elf); 93b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper else 94b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->free_elf = true; 95b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 96b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 97b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper return result; 98b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper} 99775375e3bd177cb19acb5020b6e0917551807276Mark WielaardINTDEF(dwarf_begin) 100