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5ef50d00 | 1 | /* Copyright (C) 1999, 2001 Free Software Foundation, Inc. |
c41041bc 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 | |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
c41041bc UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
c41041bc | 13 | |
41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
c41041bc | 18 | |
c08bc50a | 19 | #include <bits/libc-lock.h> |
c41041bc UD |
20 | #include <stdlib.h> |
21 | #include "exit.h" | |
22 | ||
23 | /* Register a function to be called by exit or when a shared library | |
24 | is unloaded. This function is only called from code generated by | |
25 | the C++ compiler. */ | |
26 | int | |
27 | __cxa_atexit (void (*func) (void *), void *arg, void *d) | |
28 | { | |
29 | struct exit_function *new = __new_exitfn (); | |
30 | ||
31 | if (new == NULL) | |
32 | return -1; | |
33 | ||
34 | new->flavor = ef_cxa; | |
5ef50d00 | 35 | new->func.cxa.fn = (void (*) (void *, int)) func; |
c41041bc UD |
36 | new->func.cxa.arg = arg; |
37 | new->func.cxa.dso_handle = d; | |
38 | return 0; | |
39 | } | |
c08bc50a UD |
40 | |
41 | ||
42 | /* We change global data, so we need locking. */ | |
43 | __libc_lock_define_initialized (static, lock) | |
44 | ||
45 | ||
46 | static struct exit_function_list initial; | |
47 | struct exit_function_list *__exit_funcs = &initial; | |
48 | ||
49 | struct exit_function * | |
50 | __new_exitfn (void) | |
51 | { | |
52 | struct exit_function_list *l; | |
53 | size_t i = 0; | |
54 | ||
55 | __libc_lock_lock (lock); | |
56 | ||
57 | for (l = __exit_funcs; l != NULL; l = l->next) | |
58 | { | |
59 | for (i = 0; i < l->idx; ++i) | |
60 | if (l->fns[i].flavor == ef_free) | |
61 | break; | |
62 | if (i < l->idx) | |
63 | break; | |
64 | ||
65 | if (l->idx < sizeof (l->fns) / sizeof (l->fns[0])) | |
66 | { | |
67 | i = l->idx++; | |
68 | break; | |
69 | } | |
70 | } | |
71 | ||
72 | if (l == NULL) | |
73 | { | |
74 | l = (struct exit_function_list *) | |
75 | malloc (sizeof (struct exit_function_list)); | |
76 | if (l != NULL) | |
77 | { | |
78 | l->next = __exit_funcs; | |
79 | __exit_funcs = l; | |
80 | ||
81 | l->idx = 1; | |
82 | i = 0; | |
83 | } | |
84 | } | |
85 | ||
86 | /* Mark entry as used, but we don't know the flavor now. */ | |
87 | if (l != NULL) | |
88 | l->fns[i].flavor = ef_us; | |
89 | ||
90 | __libc_lock_unlock (lock); | |
91 | ||
92 | return l == NULL ? NULL : &l->fns[i]; | |
93 | } |