newlib-cygwin/newlib/libc/misc/init.c

/*
 * Copyright (C) 2004 CodeSourcery, LLC
 *
 * Permission to use, copy, modify, and distribute this file
 * for any purpose is hereby granted without fee, provided that
 * the above copyright notice and this notice appears in all
 * copies.
 *
 * This file is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */

/* Handle ELF .{pre_init,init,fini}_array sections.  */
#include <sys/types.h>

#ifdef HAVE_INITFINI_ARRAY

/* These magic symbols are provided by the linker.  */
extern void (*__preinit_array_start []) (void) __attribute__((weak));
extern void (*__preinit_array_end []) (void) __attribute__((weak));
extern void (*__init_array_start []) (void) __attribute__((weak));
extern void (*__init_array_end []) (void) __attribute__((weak));
extern void (*__fini_array_start []) (void) __attribute__((weak));
extern void (*__fini_array_end []) (void) __attribute__((weak));

extern void _init (void);
extern void _fini (void);

/* Iterate over all the init routines.  */
void
__libc_init_array (void)
{
  size_t count;
  size_t i;

  count = __preinit_array_end - __preinit_array_start;
  for (i = 0; i < count; i++)
    __preinit_array_start[i] ();

  _init ();

  count = __init_array_end - __init_array_start;
  for (i = 0; i < count; i++)
    __init_array_start[i] ();
}

/* Run all the cleanup routines.  */
void
__libc_fini_array (void)
{
  size_t count;
  size_t i;
  
  count = __fini_array_end - __fini_array_start;
  for (i = count; i > 0; i--)
    __fini_array_start[i-1] ();

  _fini ();
}
#endif