162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/*
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* COmmon routine to call call registered atexit-like routines.
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*/
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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 free. */
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#ifndef MALLOC_PROVIDED
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void free(void *) _ATTRIBUTE((__weak__));
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#endif
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#ifndef __SINGLE_THREAD__
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__LOCK_INIT_RECURSIVE(, __atexit_recursive_mutex);
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#endif
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#ifdef _REENT_GLOBAL_ATEXIT
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struct _atexit *_global_atexit = _NULL;
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#endif
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#ifdef _WANT_REGISTER_FINI
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/* If "__libc_fini" is defined, finalizers (either
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"__libc_fini_array", or "_fini", as appropriate) will be run after
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all user-specified atexit handlers. For example, you can define
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"__libc_fini" to "_fini" in your linker script if you want the C
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library, rather than startup code, to register finalizers. If you
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do that, then your startup code need not contain references to
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"atexit" or "exit". As a result, only applications that reference
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"exit" explicitly will pull in finalization code.
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The choice of whether to register finalizers from libc or from
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startup code is deferred to link-time, rather than being a
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configure-time option, so that the same C library binary can be
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used with multiple BSPs, some of which register finalizers from
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startup code, while others defer to the C library. */
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extern char __libc_fini __attribute__((weak));
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/* Register the application finalization function with atexit. These
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finalizers should run last. Therefore, we want to call atexit as
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soon as possible. */
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static void
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register_fini(void) __attribute__((constructor (0)));
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static void
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register_fini(void)
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{
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if (&__libc_fini) {
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#ifdef HAVE_INITFINI_ARRAY
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extern void __libc_fini_array (void);
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atexit (__libc_fini_array);
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#else
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extern void _fini (void);
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atexit (_fini);
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#endif
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}
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}
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#endif /* _WANT_REGISTER_FINI */
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/*
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* Call registered exit handlers. If D is null then all handlers are called,
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* otherwise only the handlers from that DSO are called.
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*/
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void
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__call_exitprocs (int code, void *d)
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{
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register struct _atexit *p;
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struct _atexit **lastp;
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register struct _on_exit_args * args;
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register int n;
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int i;
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void (*fn) (void);
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#ifndef __SINGLE_THREAD__
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__lock_acquire_recursive(__atexit_recursive_mutex);
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#endif
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restart:
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p = _GLOBAL_ATEXIT;
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lastp = &_GLOBAL_ATEXIT;
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while (p)
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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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#else
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args = &p->_on_exit_args;
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#endif
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for (n = p->_ind - 1; n >= 0; n--)
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{
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int ind;
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i = 1 << n;
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/* Skip functions not from this dso. */
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if (d && (!args || args->_dso_handle[n] != d))
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continue;
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/* Remove the function now to protect against the
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function calling exit recursively. */
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fn = p->_fns[n];
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if (n == p->_ind - 1)
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p->_ind--;
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else
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p->_fns[n] = NULL;
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/* Skip functions that have already been called. */
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if (!fn)
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continue;
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ind = p->_ind;
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/* Call the function. */
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if (!args || (args->_fntypes & i) == 0)
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fn ();
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else if ((args->_is_cxa & i) == 0)
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(*((void (*)(int, void *)) fn))(code, args->_fnargs[n]);
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else
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(*((void (*)(void *)) fn))(args->_fnargs[n]);
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/* The function we called call atexit and registered another
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function (or functions). Call these new functions before
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continuing with the already registered functions. */
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if (ind != p->_ind || *lastp != p)
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goto restart;
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}
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#if !defined (_ATEXIT_DYNAMIC_ALLOC) || !defined (MALLOC_PROVIDED)
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break;
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#else
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/* Move to the next block. Free empty blocks except the last one,
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which is part of _GLOBAL_REENT. */
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if (p->_ind == 0 && p->_next)
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{
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/* Remove empty block from the list. */
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*lastp = p->_next;
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#ifdef _REENT_SMALL
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if (args)
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free (args);
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#endif
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free (p);
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p = *lastp;
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}
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else
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{
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lastp = &p->_next;
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p = p->_next;
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}
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#endif
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}
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#ifndef __SINGLE_THREAD__
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__lock_release_recursive(__atexit_recursive_mutex);
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#endif
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}
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