100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
/*
|
|
* Common routine to implement atexit-like functionality.
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <reent.h>
|
|
#include <sys/lock.h>
|
|
#include "atexit.h"
|
|
|
|
/* Make this a weak reference to avoid pulling in malloc. */
|
|
void * malloc(size_t) _ATTRIBUTE((__weak__));
|
|
__LOCK_INIT_RECURSIVE(, __atexit_lock);
|
|
|
|
/*
|
|
* Register a function to be performed at exit or on shared library unload.
|
|
*/
|
|
|
|
int
|
|
_DEFUN (__register_exitproc,
|
|
(type, fn, arg, d),
|
|
int type _AND
|
|
void (*fn) (void) _AND
|
|
void *arg _AND
|
|
void *d)
|
|
{
|
|
struct _on_exit_args * args;
|
|
register struct _atexit *p;
|
|
|
|
#ifndef __SINGLE_THREAD__
|
|
__lock_acquire_recursive(__atexit_lock);
|
|
#endif
|
|
|
|
p = _GLOBAL_REENT->_atexit;
|
|
if (p == NULL)
|
|
_GLOBAL_REENT->_atexit = p = &_GLOBAL_REENT->_atexit0;
|
|
if (p->_ind >= _ATEXIT_SIZE)
|
|
{
|
|
#ifndef _ATEXIT_DYNAMIC_ALLOC
|
|
return -1;
|
|
#else
|
|
/* Don't dynamically allocate the atexit array if malloc is not
|
|
available. */
|
|
if (!malloc)
|
|
return -1;
|
|
|
|
p = (struct _atexit *) malloc (sizeof *p);
|
|
if (p == NULL)
|
|
{
|
|
#ifndef __SINGLE_THREAD__
|
|
__lock_release_recursive(__atexit_lock);
|
|
#endif
|
|
return -1;
|
|
}
|
|
p->_ind = 0;
|
|
p->_next = _GLOBAL_REENT->_atexit;
|
|
_GLOBAL_REENT->_atexit = p;
|
|
#ifndef _REENT_SMALL
|
|
p->_on_exit_args._fntypes = 0;
|
|
p->_on_exit_args._is_cxa = 0;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
if (type != __et_atexit)
|
|
{
|
|
#ifdef _REENT_SMALL
|
|
args = p->_on_exit_args_ptr;
|
|
if (args == NULL)
|
|
{
|
|
if (malloc)
|
|
args = malloc (sizeof * p->_on_exit_args_ptr);
|
|
|
|
if (args == NULL)
|
|
{
|
|
#ifndef __SINGLE_THREAD__
|
|
__lock_release(lock);
|
|
#endif
|
|
return -1;
|
|
}
|
|
args->_fntypes = 0;
|
|
args->_is_cxa = 0;
|
|
p->_on_exit_args_ptr = args;
|
|
}
|
|
#else
|
|
args = &p->_on_exit_args;
|
|
#endif
|
|
args->_fnargs[p->_ind] = arg;
|
|
args->_fntypes |= (1 << p->_ind);
|
|
args->_dso_handle[p->_ind] = d;
|
|
if (type == __et_cxa)
|
|
args->_is_cxa |= (1 << p->_ind);
|
|
}
|
|
p->_fns[p->_ind++] = fn;
|
|
#ifndef __SINGLE_THREAD__
|
|
__lock_release_recursive(__atexit_lock);
|
|
#endif
|
|
return 0;
|
|
}
|