1 /* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
2 * This file is part of the Linux-8086 C library and is distributed
3 * under the GNU Library General Public License.
7 * Dec 2000 Manuel Novoa III
9 * Made atexit handling conform to standards... i.e. no args.
10 * Removed on_exit since it did not match gnu libc definition.
11 * Combined atexit and __do_exit into one object file.
13 * Feb 2001 Manuel Novoa III
15 * Reworked file after addition of __uClibc_main.
16 * Changed name of __do_exit to atexit_handler.
17 * Changed name of __cleanup to __uClibc_cleanup.
18 * Moved declaration of __uClibc_cleanup to __uClibc_main
19 * where it is initialized with (possibly weak alias)
22 * Jul 2001 Steve Thayer
24 * Added an on_exit implementation (that now matches gnu libc definition.)
25 * Pulled atexit_handler out of the atexit object since it is now required by
26 * on_exit as well. Renamed it to __exit_handler.
27 * Fixed a problem where exit functions stop getting called if one of
29 * As a side effect of these changes, abort() no longer calls the exit
30 * functions (it now matches the gnu libc definition).
32 * August 2002 Erik Andersen
33 * Added locking so atexit and friends can be thread safe
44 #ifdef __UCLIBC_HAS_THREADS__
46 extern pthread_mutex_t mylock;
47 # define LOCK __pthread_mutex_lock(&mylock)
48 # define UNLOCK __pthread_mutex_unlock(&mylock);
55 typedef void (*aefuncp) (void); /* atexit function pointer */
56 typedef void (*oefuncp) (int, void *); /* on_exit function pointer */
60 } ef_type; /* exit function types */
62 /* this is in the L_exit object */
63 extern void (*__exit_cleanup) (int);
65 /* these are in the L___do_exit object */
66 extern int __exit_slots;
67 extern int __exit_count;
68 extern void __exit_handler(int);
69 struct exit_function {
70 ef_type type; /* ef_atexit or ef_on_exit */
79 #ifdef __UCLIBC_DYNAMIC_ATEXIT__
80 extern struct exit_function *__exit_function_table;
82 extern struct exit_function __exit_function_table[__UCLIBC_MAX_ATEXIT];
87 * register a function to be called at normal program termination
88 * (the registered function takes no arguments)
90 int atexit(aefuncp func)
92 struct exit_function *efp;
96 #ifdef __UCLIBC_DYNAMIC_ATEXIT__
97 /* If we are out of function table slots, make some more */
98 if (__exit_slots < __exit_count+1) {
99 efp=realloc(__exit_function_table,
100 (__exit_slots+20)*sizeof(struct exit_function));
106 __exit_function_table = efp;
110 if (__exit_count >= __UCLIBC_MAX_ATEXIT) {
116 __exit_cleanup = __exit_handler; /* enable cleanup */
117 efp = &__exit_function_table[__exit_count++];
118 efp->type = ef_atexit;
119 efp->funcs.atexit = func;
128 * register a function to be called at normal program termination
129 * the registered function takes two arguments:
130 * status - the exit status that was passed to the exit() function
131 * arg - generic argument
133 int on_exit(oefuncp func, void *arg)
135 struct exit_function *efp;
139 #ifdef __UCLIBC_DYNAMIC_ATEXIT__
140 /* If we are out of function table slots, make some more */
141 if (__exit_slots < __exit_count+1) {
142 efp=realloc(__exit_function_table,
143 (__exit_slots+20)*sizeof(struct exit_function));
149 __exit_function_table=efp;
153 if (__exit_count >= __UCLIBC_MAX_ATEXIT) {
160 __exit_cleanup = __exit_handler; /* enable cleanup */
161 efp = &__exit_function_table[__exit_count++];
162 efp->type = ef_on_exit;
163 efp->funcs.on_exit.func = func;
164 efp->funcs.on_exit.arg = arg;
171 #ifdef L___exit_handler
172 int __exit_count = 0; /* Number of registered exit functions */
173 #ifdef __UCLIBC_DYNAMIC_ATEXIT__
174 struct exit_function *__exit_function_table = NULL;
175 int __exit_slots = 0; /* Size of __exit_function_table */
177 struct exit_function __exit_function_table[__UCLIBC_MAX_ATEXIT];
182 * Handle the work of executing the registered exit functions
183 * This is called while we are locked, so no additional locking
186 void __exit_handler(int status)
188 struct exit_function *efp;
190 /* In reverse order */
191 while ( __exit_count ) {
192 efp = &__exit_function_table[--__exit_count];
195 if (efp->funcs.on_exit.func) {
196 (efp->funcs.on_exit.func) (status, efp->funcs.on_exit.arg);
200 if (efp->funcs.atexit) {
201 (efp->funcs.atexit) ();
206 #ifdef __UCLIBC_DYNAMIC_ATEXIT__
207 /* Free up memory used by the __exit_function_table structure */
208 if (__exit_function_table)
209 free(__exit_function_table);
215 extern void weak_function _stdio_term(void);
216 void (*__exit_cleanup) (int) = 0;
217 #ifdef __UCLIBC_HAS_THREADS__
218 pthread_mutex_t mylock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
221 #ifdef __UCLIBC_CTOR_DTOR__
222 extern void (*__app_fini)(void);
225 extern void (*__rtld_fini)(void);
227 #ifdef _DL_FINI_CRT_COMPAT
228 extern void (*__dl_fini)(void);
232 * Normal program termination
236 /* Perform exit-specific cleanup (atexit and on_exit) */
238 if (__exit_cleanup) {
243 #ifdef __UCLIBC_CTOR_DTOR__
244 if (__app_fini != NULL)
247 #ifndef _DL_FINI_CRT_COMPAT
248 if (__rtld_fini != NULL)
251 if (__dl_fini != NULL)
255 /* If we are using stdio, try to shut it down. At the very least,
256 * this will attempt to commit all buffered writes. It may also
257 * unbuffer all writable files, or close them outright.
258 * Check the stdio routines for details. */