Retro68/elfutils/tests/test-elf_cntl_gelf_getshdr.c

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/* Copyright (C) 2012 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <gelf.h>
#include <libelf.h>
#include <stdbool.h>
#include <inttypes.h>
int
main (int argc, char *argv[])
{
if (argc != 3)
{
fprintf (stderr, "Needs two arguments.\n");
fprintf (stderr, "First needs to be 'READ', 'MMAP' or 'FDREAD'\n");
fprintf (stderr, "Second is the ELF file to read.\n");
exit (2); /* user error */
}
bool do_mmap = false;
bool close_fd = false;
if (strcmp (argv[1], "READ") == 0)
{
do_mmap = false;
close_fd = false;
}
else if (strcmp (argv[1], "MMAP") == 0)
{
do_mmap = true;
close_fd = false;
}
else if (strcmp (argv[1], "FDREAD") == 0)
{
do_mmap = false;
close_fd = true;
}
else
{
fprintf (stderr, "First arg needs to be 'READ', 'MMAP' or 'FDREAD'\n");
exit (2); /* user error */
}
elf_version (EV_CURRENT);
int fd = open (argv[2], O_RDONLY);
if (fd < 0)
{
fprintf (stderr, "Cannot open input file %s: %s\n", argv[2],
strerror (errno));
exit (2);
}
Elf *elf = elf_begin (fd, do_mmap ? ELF_C_READ_MMAP : ELF_C_READ, NULL);
if (elf == NULL)
{
fprintf (stderr, "elf_begin failed for %s: %s\n", argv[2],
elf_errmsg (-1));
exit (2);
}
if (! do_mmap && close_fd)
{
if (elf_cntl (elf, ELF_C_FDREAD) < 0)
{
fprintf (stderr, "elf_cntl failed for %s: %s\n", argv[2],
elf_errmsg (-1));
exit (1);
}
close (fd);
}
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (elf, scn)) != NULL)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
printf ("Section at offset %#0" PRIx64 "\n", shdr->sh_offset);
}
elf_end (elf);
exit (0);
}