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/* Create descriptor from file descriptor for processing file.
Copyright (C) 2002, 2003, 2004 Red Hat, Inc.
Written by Ulrich Drepper <drepper@redhat.com>, 2002.
This program is Open Source software; you can redistribute it and/or
modify it under the terms of the Open Software License version 1.0 as
published by the Open Source Initiative.
You should have received a copy of the Open Software License along
with this program; if not, you may obtain a copy of the Open Software
License version 1.0 from http://www.opensource.org/licenses/osl.php or
by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
3001 King Ranch Road, Ukiah, CA 95482. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <stddef.h>
#include <sys/stat.h>
#include <libdwP.h>
Dwarf *
dwarf_begin (fd, cmd)
int fd;
Dwarf_Cmd cmd;
{
Elf *elf;
Elf_Cmd elfcmd;
Dwarf *result = NULL;
switch (cmd)
{
case DWARF_C_READ:
elfcmd = ELF_C_READ_MMAP;
break;
case DWARF_C_WRITE:
elfcmd = ELF_C_WRITE;
break;
case DWARF_C_RDWR:
elfcmd = ELF_C_RDWR;
break;
default:
/* No valid mode. */
__libdw_seterrno (DWARF_E_INVALID_CMD);
return NULL;
}
/* We have to call `elf_version' here since the user might have not
done it or initialized libelf with a different version. This
would break libdwarf since we are using the ELF data structures
in a certain way. */
elf_version (EV_CURRENT);
/* Get an ELF descriptor. */
elf = elf_begin (fd, elfcmd, NULL);
if (elf == NULL)
{
/* Test why the `elf_begin" call failed. */
struct stat64 st;
if (fstat64 (fd, &st) == 0 && ! S_ISREG (st.st_mode))
__libdw_seterrno (DWARF_E_NO_REGFILE);
else if (errno == EBADF)
__libdw_seterrno (DWARF_E_INVALID_FILE);
else
__libdw_seterrno (DWARF_E_IO_ERROR);
}
else
{
/* Do the real work now that we have an ELF descriptor. */
result = dwarf_begin_elf (elf, cmd, NULL);
/* If this failed, free the resources. */
if (result == NULL)
elf_end (elf);
else
result->free_elf = true;
}
return result;
}
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