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ba1ffaa1 | 1 | /* Copyright (C) 1991, 1996 Free Software Foundation, Inc. |
2c6fe0bd UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
ba1ffaa1 | 19 | #include <libc-lock.h> |
28f540f4 RM |
20 | #include <stdlib.h> |
21 | #include "exit.h" | |
22 | ||
23 | ||
24 | /* Register FUNC to be executed by `exit'. */ | |
25 | int | |
ba1ffaa1 | 26 | atexit (void (*func) (void)) |
28f540f4 | 27 | { |
ba1ffaa1 | 28 | struct exit_function *new = __new_exitfn (); |
28f540f4 RM |
29 | |
30 | if (new == NULL) | |
31 | return -1; | |
32 | ||
33 | new->flavor = ef_at; | |
34 | new->func.at = func; | |
35 | return 0; | |
36 | } | |
37 | ||
38 | ||
ba1ffaa1 UD |
39 | /* We change global data, so we need locking. */ |
40 | __libc_lock_define_initialized (static, lock) | |
41 | ||
42 | ||
28f540f4 RM |
43 | static struct exit_function_list fnlist = { NULL, 0, }; |
44 | struct exit_function_list *__exit_funcs = &fnlist; | |
45 | ||
46 | struct exit_function * | |
ba1ffaa1 | 47 | __new_exitfn (void) |
28f540f4 | 48 | { |
ba1ffaa1 UD |
49 | struct exit_function_list *l; |
50 | size_t i = 0; | |
51 | ||
0f110f41 | 52 | __libc_lock_lock (lock); |
28f540f4 RM |
53 | |
54 | for (l = __exit_funcs; l != NULL; l = l->next) | |
55 | { | |
28f540f4 RM |
56 | for (i = 0; i < l->idx; ++i) |
57 | if (l->fns[i].flavor == ef_free) | |
ba1ffaa1 UD |
58 | break; |
59 | if (i < l->idx) | |
60 | break; | |
61 | ||
62 | if (l->idx < sizeof (l->fns) / sizeof (l->fns[0])) | |
63 | { | |
64 | i = l->idx++; | |
65 | break; | |
66 | } | |
28f540f4 RM |
67 | } |
68 | ||
28f540f4 | 69 | if (l == NULL) |
ba1ffaa1 UD |
70 | { |
71 | l = (struct exit_function_list *) | |
72 | malloc (sizeof (struct exit_function_list)); | |
73 | if (l != NULL) | |
74 | { | |
75 | l->next = __exit_funcs; | |
76 | __exit_funcs = l; | |
77 | ||
78 | l->idx = 1; | |
79 | i = 0; | |
80 | } | |
81 | } | |
82 | ||
83 | /* Mark entry as used, but we don't know the flavor now. */ | |
84 | if (l != NULL) | |
85 | l->fns[i].flavor = ef_us; | |
86 | ||
0f110f41 | 87 | __libc_lock_unlock (lock); |
28f540f4 | 88 | |
ba1ffaa1 | 89 | return l == NULL ? NULL : &l->fns[i]; |
28f540f4 | 90 | } |