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 elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2002. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of either 8 9 * the GNU Lesser General Public License as published by the Free 10 Software Foundation; either version 3 of the License, or (at 11 your option) any later version 12 13 or 14 15 * the GNU General Public License as published by the Free 16 Software Foundation; either version 2 of the License, or (at 17 your option) any later version 18 19 or both in parallel, as here. 20 21 elfutils is distributed in the hope that it will be useful, but 22 WITHOUT ANY WARRANTY; without even the implied warranty of 23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 General Public License for more details. 25 26 You should have received copies of the GNU General Public License and 27 the GNU Lesser General Public License along with this program. If 28 not, see <http://www.gnu.org/licenses/>. */ 29 30 #ifdef HAVE_CONFIG_H 31 # include <config.h> 32 #endif 33 34 #include <errno.h> 35 #include <stddef.h> 36 #include <sys/stat.h> 37 38 #include <libdwP.h> 39 40 41 Dwarf * 42 dwarf_begin (int fd, Dwarf_Cmd cmd) 43 { 44 Elf *elf; 45 Elf_Cmd elfcmd; 46 Dwarf *result = NULL; 47 48 switch (cmd) 49 { 50 case DWARF_C_READ: 51 elfcmd = ELF_C_READ_MMAP; 52 break; 53 case DWARF_C_WRITE: 54 elfcmd = ELF_C_WRITE; 55 break; 56 case DWARF_C_RDWR: 57 elfcmd = ELF_C_RDWR; 58 break; 59 default: 60 /* No valid mode. */ 61 __libdw_seterrno (DWARF_E_INVALID_CMD); 62 return NULL; 63 } 64 65 /* We have to call `elf_version' here since the user might have not 66 done it or initialized libelf with a different version. This 67 would break libdwarf since we are using the ELF data structures 68 in a certain way. */ 69 elf_version (EV_CURRENT); 70 71 /* Get an ELF descriptor. */ 72 elf = elf_begin (fd, elfcmd, NULL); 73 if (elf == NULL) 74 { 75 /* Test why the `elf_begin" call failed. */ 76 struct stat st; 77 78 if (fstat (fd, &st) == 0 && ! S_ISREG (st.st_mode)) 79 __libdw_seterrno (DWARF_E_NO_REGFILE); 80 else if (errno == EBADF) 81 __libdw_seterrno (DWARF_E_INVALID_FILE); 82 else 83 __libdw_seterrno (DWARF_E_IO_ERROR); 84 } 85 else 86 { 87 /* Do the real work now that we have an ELF descriptor. */ 88 result = INTUSE(dwarf_begin_elf) (elf, cmd, NULL); 89 90 /* If this failed, free the resources. */ 91 if (result == NULL) 92 elf_end (elf); 93 else 94 result->free_elf = true; 95 } 96 97 return result; 98 } 99 INTDEF(dwarf_begin) 100
