/* Startup support for ELF initializers/finalizers in the main executable.

   Copyright (C) 2002-2018 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.

   In addition to the permissions in the GNU Lesser General Public

   License, the Free Software Foundation gives you unlimited

   permission to link the compiled version of this file with other

   programs, and to distribute those programs without any restriction

   coming from the use of this file. (The GNU Lesser General Public

   License restrictions do apply in other respects; for example, they

   cover modification of the file, and distribution when not linked

   into another program.)

   Note that people who make modified versions of this file are not

   obligated to grant this special exception for their modified

   versions; it is their choice whether to do so. The GNU Lesser

   General Public License gives permission to release a modified

   version without this exception; this exception also makes it

   possible to release a modified version which carries forward this

   exception.

   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 <stddef.h>

/* These magic symbols are provided by the linker.  */

extern void (*__preinit_array_start []) (int, char **, char **)

  attribute_hidden;

extern void (*__preinit_array_end []) (int, char **, char **)

  attribute_hidden;

extern void (*__init_array_start []) (int, char **, char **)

  attribute_hidden;

extern void (*__init_array_end []) (int, char **, char **)

  attribute_hidden;

extern void (*__fini_array_start []) (void) attribute_hidden;

extern void (*__fini_array_end []) (void) attribute_hidden;

#ifndef NO_INITFINI

/* These function symbols are provided for the .init/.fini section entry

   points automagically by the linker.  */

extern void _init (void);

extern void _fini (void);

#endif

/* These functions are passed to __libc_start_main by the startup code.

   These get statically linked into each program.  For dynamically linked

   programs, this module will come from libc_nonshared.a and differs from

   the libc.a module in that it doesn't call the preinit array.  */

void

__libc_csu_init (int argc, char **argv, char **envp)

{

  /* For dynamically linked executables the preinit array is executed by

     the dynamic linker (before initializing any shared object).  */

#ifndef LIBC_NONSHARED

  /* For static executables, preinit happens right before init.  */

  {

    const size_t size = __preinit_array_end - __preinit_array_start;

    size_t i;

    for (i = 0; i < size; i++)

      (*__preinit_array_start [i]) (argc, argv, envp);

  }

#endif

#ifndef NO_INITFINI

  _init ();

#endif

  const size_t size = __init_array_end - __init_array_start;

  for (size_t i = 0; i < size; i++)

      (*__init_array_start [i]) (argc, argv, envp);

}

/* This function should not be used anymore.  We run the executable's

   destructor now just like any other.  We cannot remove the function,

   though.  */

void

__libc_csu_fini (void)

{

#ifndef LIBC_NONSHARED

  size_t i = __fini_array_end - __fini_array_start;

  while (i-- > 0)

    (*__fini_array_start [i]) ();

# ifndef NO_INITFINI

  _fini ();

# endif

#endif

}