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