1/* Initialization code run first thing by the ELF startup code. Common version
2 Copyright (C) 1995-2016 Free Software Foundation, Inc.
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
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <ctype.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <fcntl.h>
23#include <unistd.h>
24#include <sysdep.h>
25#include <fpu_control.h>
26#include <sys/param.h>
27#include <sys/types.h>
28#include <libc-internal.h>
29
30#include <ldsodefs.h>
31
32/* Set nonzero if we have to be prepared for more than one libc being
33 used in the process. Safe assumption if initializer never runs. */
34int __libc_multiple_libcs attribute_hidden = 1;
35
36/* Remember the command line argument and enviroment contents for
37 later calls of initializers for dynamic libraries. */
38int __libc_argc attribute_hidden;
39char **__libc_argv attribute_hidden;
40
41
42void
43__libc_init_first (int argc, char **argv, char **envp)
44{
45#ifdef SHARED
46 /* For DSOs we do not need __libc_init_first but instead _init. */
47}
48
49void
50attribute_hidden
51_init (int argc, char **argv, char **envp)
52{
53#endif
54#ifdef USE_NONOPTION_FLAGS
55 extern void __getopt_clean_environment (char **);
56#endif
57
58 __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
59
60 /* Make sure we don't initialize twice. */
61 if (!__libc_multiple_libcs)
62 {
63 /* Set the FPU control word to the proper default value if the
64 kernel would use a different value. */
65 if (__fpu_control != GLRO(dl_fpu_control))
66 __setfpucw (__fpu_control);
67 }
68
69 /* Save the command-line arguments. */
70 __libc_argc = argc;
71 __libc_argv = argv;
72 __environ = envp;
73
74#ifndef SHARED
75 __libc_init_secure ();
76
77 /* First the initialization which normally would be done by the
78 dynamic linker. */
79 _dl_non_dynamic_init ();
80#endif
81
82#ifdef VDSO_SETUP
83 VDSO_SETUP ();
84#endif
85
86 __init_misc (argc, argv, envp);
87
88#ifdef USE_NONOPTION_FLAGS
89 /* This is a hack to make the special getopt in GNU libc working. */
90 __getopt_clean_environment (envp);
91#endif
92
93 /* Initialize ctype data. */
94 __ctype_init ();
95
96#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
97 __libc_global_ctors ();
98#endif
99}
100
101/* This function is defined here so that if this file ever gets into
102 ld.so we will get a link error. Having this file silently included
103 in ld.so causes disaster, because the _init definition above will
104 cause ld.so to gain an init function, which is not a cool thing. */
105
106extern void _dl_start (void) __attribute__ ((noreturn));
107
108void
109_dl_start (void)
110{
111 abort ();
112}
113