glibc/csu/init-first.c

/* Initialization code run first thing by the ELF startup code.  Stub version.
   Copyright (C) 1995-2012 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>

/* Set nonzero if we have to be prepared for more then one libc being
   used in the process.  Safe assumption if initializer never runs.  */
int __libc_multiple_libcs attribute_hidden = 1;

extern void __libc_init (int, char **, char **);
#ifdef USE_NONOPTION_FLAGS
extern void __getopt_clean_environment (char **);
#endif

#ifdef SHARED
void
__libc_init_first (void)
{
}
#endif

#ifdef SHARED
/* NOTE!  The linker notices the magical name `_init' and sets the DT_INIT
   pointer in the dynamic section based solely on that.  It is convention
   for this function to be in the `.init' section, but the symbol name is
   the only thing that really matters!!  */
void _init
#else
void __libc_init_first
#endif
(int argc, char *arg0, ...)
{
  char **argv = &arg0, **envp = &argv[argc + 1];

  __environ = envp;
  __libc_init (argc, argv, envp);

#ifdef USE_NONOPTION_FLAGS
  /* This is a hack to make the special getopt in GNU libc working.  */
  __getopt_clean_environment (envp);
#endif

  /* Initialize ctype data.  */
  __ctype_init ();
}