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/* Test program for reading and writing out the same file in-place
Copyright (C) 2019 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 <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include ELFUTILS_HEADER(elf)
#include <gelf.h>
int
main (int argc, const char *argv[])
{
/* Takes the given file, and create a new identical one. */
if (argc != 2)
{
fprintf (stderr, "elfrdwrnop elf-file\n");
exit (1);
}
elf_version (EV_CURRENT);
const char *name = argv[1];
printf ("elfrdwrdnop %s\n", name);
int fd = open (name, O_RDWR);
if (fd < 0)
{
fprintf (stderr, "Couldn't open file '%s': %s\n",
name, strerror (errno));
exit (1);
}
Elf *elf = elf_begin (fd, ELF_C_RDWR, NULL);
if (elf == NULL)
{
fprintf (stderr, "Couldn't open ELF file '%s': %s\n",
name, elf_errmsg (-1));
exit (1);
}
/* Write everything to disk. If there are any phdrs, then we want
the exact same layout. */
size_t phnum;
if (elf_getphdrnum (elf, &phnum) != 0)
{
printf ("cannot get phdrs: %s\n", elf_errmsg (-1));
exit (1);
}
if (phnum > 0)
elf_flagelf (elf, ELF_C_SET, ELF_F_LAYOUT);
if (elf_update (elf, ELF_C_WRITE) < 0)
{
printf ("failure in elf_update: %s\n", elf_errmsg (-1));
exit (1);
}
if (elf_end (elf) != 0)
{
printf ("couldn't cleanup elf '%s': %s\n", name, elf_errmsg (-1));
exit (1);
}
if (close (fd) != 0)
{
printf ("couldn't close '%s': %s\n", name, strerror (errno));
exit (1);
}
return 0;
}
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