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06b31ad3 | 1 | /* Startup support for ELF initializers/finalizers in the main executable. |
04277e02 | 2 | Copyright (C) 2002-2019 Free Software Foundation, Inc. |
06b31ad3 RM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
92c6ccd1 RM |
10 | In addition to the permissions in the GNU Lesser General Public |
11 | License, the Free Software Foundation gives you unlimited | |
12 | permission to link the compiled version of this file with other | |
13 | programs, and to distribute those programs without any restriction | |
14 | coming from the use of this file. (The GNU Lesser General Public | |
15 | License restrictions do apply in other respects; for example, they | |
16 | cover modification of the file, and distribution when not linked | |
17 | into another program.) | |
18 | ||
19 | Note that people who make modified versions of this file are not | |
20 | obligated to grant this special exception for their modified | |
21 | versions; it is their choice whether to do so. The GNU Lesser | |
22 | General Public License gives permission to release a modified | |
23 | version without this exception; this exception also makes it | |
24 | possible to release a modified version which carries forward this | |
25 | exception. | |
26 | ||
06b31ad3 RM |
27 | The GNU C Library is distributed in the hope that it will be useful, |
28 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
30 | Lesser General Public License for more details. | |
31 | ||
32 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
33 | License along with the GNU C Library; if not, see |
34 | <http://www.gnu.org/licenses/>. */ | |
06b31ad3 RM |
35 | |
36 | #include <stddef.h> | |
37 | ||
ce33ee7c | 38 | |
06b31ad3 | 39 | /* These magic symbols are provided by the linker. */ |
04395c90 UD |
40 | extern void (*__preinit_array_start []) (int, char **, char **) |
41 | attribute_hidden; | |
42 | extern void (*__preinit_array_end []) (int, char **, char **) | |
43 | attribute_hidden; | |
44 | extern void (*__init_array_start []) (int, char **, char **) | |
45 | attribute_hidden; | |
46 | extern void (*__init_array_end []) (int, char **, char **) | |
47 | attribute_hidden; | |
6d1d0720 UD |
48 | extern void (*__fini_array_start []) (void) attribute_hidden; |
49 | extern void (*__fini_array_end []) (void) attribute_hidden; | |
ce33ee7c | 50 | |
06b31ad3 | 51 | |
9967e003 | 52 | #ifndef NO_INITFINI |
06b31ad3 RM |
53 | /* These function symbols are provided for the .init/.fini section entry |
54 | points automagically by the linker. */ | |
55 | extern void _init (void); | |
56 | extern void _fini (void); | |
9967e003 RM |
57 | #endif |
58 | ||
06b31ad3 RM |
59 | |
60 | /* These functions are passed to __libc_start_main by the startup code. | |
61 | These get statically linked into each program. For dynamically linked | |
62 | programs, this module will come from libc_nonshared.a and differs from | |
21ad0558 | 63 | the libc.a module in that it doesn't call the preinit array. */ |
74414708 | 64 | |
1c3c269b UD |
65 | |
66 | void | |
67 | __libc_csu_init (int argc, char **argv, char **envp) | |
68 | { | |
69 | /* For dynamically linked executables the preinit array is executed by | |
23bee3e8 | 70 | the dynamic linker (before initializing any shared object). */ |
1c3c269b UD |
71 | |
72 | #ifndef LIBC_NONSHARED | |
4bb04b1f | 73 | /* For static executables, preinit happens right before init. */ |
06b31ad3 RM |
74 | { |
75 | const size_t size = __preinit_array_end - __preinit_array_start; | |
76 | size_t i; | |
77 | for (i = 0; i < size; i++) | |
04395c90 | 78 | (*__preinit_array_start [i]) (argc, argv, envp); |
06b31ad3 | 79 | } |
06b31ad3 RM |
80 | #endif |
81 | ||
9967e003 | 82 | #ifndef NO_INITFINI |
06b31ad3 | 83 | _init (); |
9967e003 | 84 | #endif |
06b31ad3 | 85 | |
ce33ee7c UD |
86 | const size_t size = __init_array_end - __init_array_start; |
87 | for (size_t i = 0; i < size; i++) | |
04395c90 | 88 | (*__init_array_start [i]) (argc, argv, envp); |
06b31ad3 RM |
89 | } |
90 | ||
9dcafc55 UD |
91 | /* This function should not be used anymore. We run the executable's |
92 | destructor now just like any other. We cannot remove the function, | |
93 | though. */ | |
06b31ad3 RM |
94 | void |
95 | __libc_csu_fini (void) | |
96 | { | |
43c59a70 | 97 | #ifndef LIBC_NONSHARED |
06b31ad3 RM |
98 | size_t i = __fini_array_end - __fini_array_start; |
99 | while (i-- > 0) | |
100 | (*__fini_array_start [i]) (); | |
06b31ad3 | 101 | |
9967e003 | 102 | # ifndef NO_INITFINI |
06b31ad3 | 103 | _fini (); |
9967e003 | 104 | # endif |
9dcafc55 | 105 | #endif |
06b31ad3 | 106 | } |