1 /* Initialization code run first thing by the ELF startup code. Linux version.
2 Copyright (C) 1995-1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <fpu_control.h>
26 #include <sys/param.h>
27 #include <sys/types.h>
28 #include "kernel-features.h"
29 #include <libc-internal.h>
33 # include "dl-osinfo.h"
36 extern void __libc_init (int, char **, char **);
38 /* The function is called from assembly stubs the compiler can't see. */
39 static void init (int, char **, char **) __attribute__ ((unused));
41 extern int _dl_starting_up;
42 weak_extern (_dl_starting_up)
44 extern int _dl_fpu_control_set;
46 /* Set nonzero if we have to be prepared for more then one libc being
47 used in the process. Safe assumption if initializer never runs. */
48 int __libc_multiple_libcs = 1;
50 /* Remember the command line argument and enviroment contents for
51 later calls of initializers for dynamic libraries. */
57 init (int argc, char **argv, char **envp)
59 #ifdef USE_NONOPTION_FLAGS
60 extern void __getopt_clean_environment (char **);
62 /* The next variable is only here to work around a bug in gcc <= 2.7.2.2.
63 If the address would be taken inside the expression the optimizer
64 would try to be too smart and throws it away. Grrr. */
65 int *dummy_addr = &_dl_starting_up;
67 __libc_multiple_libcs = dummy_addr && !_dl_starting_up;
69 /* Make sure we don't initialize twice. */
70 if (!__libc_multiple_libcs)
73 DL_SYSDEP_OSCHECK (__libc_fatal);
76 /* Set the FPU control word to the proper default value if the
77 kernel would use a different value. (In a static program we
78 don't have this information.) */
80 if (__fpu_control != GL(dl_fpu_control))
82 __setfpucw (__fpu_control);
85 /* Save the command-line arguments. */
91 __libc_init_secure ();
94 __libc_init (argc, argv, envp);
96 #ifdef USE_NONOPTION_FLAGS
97 /* This is a hack to make the special getopt in GNU libc working. */
98 __getopt_clean_environment (envp);
102 __libc_global_ctors ();
108 strong_alias (init, _init);
110 extern void __libc_init_first (void);
113 __libc_init_first (void)
118 extern void __libc_init_first (int argc, char **argv, char **envp);
121 __libc_init_first (int argc, char **argv, char **envp)
123 init (argc, argv, envp);
128 /* This function is defined here so that if this file ever gets into
129 ld.so we will get a link error. Having this file silently included
130 in ld.so causes disaster, because the _init definition above will
131 cause ld.so to gain an init function, which is not a cool thing. */
133 extern void _dl_start (void) __attribute__ ((noreturn));