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).
38 #define __MAX_EXIT __UCLIBC_MAX_ATEXIT
40 typedef void (*aefuncp) (void); /* atexit function pointer */
41 typedef void (*oefuncp) (int, void *); /* on_exit function pointer */
45 } ef_type; /* exit function types */
47 extern void __stdio_close_all(void);
49 /* this is in the L_exit object */
50 extern void (*__exit_cleanup) (int);
52 /* these are in the L___do_exit object */
53 extern int __exit_count;
54 extern void __exit_handler(int);
55 extern struct exit_function {
56 ef_type type; /* ef_atexit or ef_on_exit */
64 } __exit_function_table[__MAX_EXIT];
68 * register a function to be called at normal program termination
69 * (the registered function takes no arguments)
71 int atexit(aefuncp func)
73 struct exit_function *efp;
75 if (__exit_count >= __MAX_EXIT) {
80 __exit_cleanup = __exit_handler; /* enable cleanup */
81 efp = &__exit_function_table[__exit_count++];
82 efp->type = ef_atexit;
83 efp->funcs.atexit = func;
91 * register a function to be called at normal program termination
92 * the registered function takes two arguments:
93 * status - the exit status that was passed to the exit() function
94 * arg - generic argument
96 int on_exit(oefuncp func, void *arg)
98 struct exit_function *efp;
100 if (__exit_count >= __MAX_EXIT) {
105 __exit_cleanup = __exit_handler; /* enable cleanup */
106 efp = &__exit_function_table[__exit_count++];
107 efp->type = ef_on_exit;
108 efp->funcs.on_exit.func = func;
109 efp->funcs.on_exit.arg = arg;
115 #ifdef L___exit_handler
116 struct exit_function __exit_function_table[__MAX_EXIT];
117 int __exit_count = 0; /* Number of registered exit functions */
120 * Handle the work of executing the registered exit functions
122 void __exit_handler(int status)
124 struct exit_function *efp;
126 /* In reverse order */
127 for ( ; __exit_count-- ; ) {
128 efp = &__exit_function_table[__exit_count];
131 if (efp->funcs.on_exit.func) {
132 (efp->funcs.on_exit.func) (status, efp->funcs.on_exit.arg);
136 if (efp->funcs.atexit) {
137 (efp->funcs.atexit) ();
142 if (__stdio_close_all)
148 extern void (*__uClibc_cleanup) (void);
149 void (*__exit_cleanup) (int) = 0;
152 * Normal program termination
156 /* Perform exit-specific cleanup (atexit and on_exit) */
157 if (__exit_cleanup) {
161 /* Clean up everything else */
162 if (__uClibc_cleanup) {