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glibc/csu/init-first.c
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/* Initialization code run first thing by the ELF startup code. Common version | |
Copyright (C) 1995-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <ctype.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <fcntl.h> | |
#include <unistd.h> | |
#include <sysdep.h> | |
#include <fpu_control.h> | |
#include <sys/param.h> | |
#include <sys/types.h> | |
#include <libc-internal.h> | |
#include <ldsodefs.h> | |
/* Set nonzero if we have to be prepared for more than one libc being | |
used in the process. Safe assumption if initializer never runs. */ | |
int __libc_multiple_libcs attribute_hidden = 1; | |
/* Remember the command line argument and enviroment contents for | |
later calls of initializers for dynamic libraries. */ | |
int __libc_argc attribute_hidden; | |
char **__libc_argv attribute_hidden; | |
void | |
__libc_init_first (int argc, char **argv, char **envp) | |
{ | |
#ifdef SHARED | |
/* For DSOs we do not need __libc_init_first but instead _init. */ | |
} | |
void | |
attribute_hidden | |
_init (int argc, char **argv, char **envp) | |
{ | |
#endif | |
#ifdef USE_NONOPTION_FLAGS | |
extern void __getopt_clean_environment (char **); | |
#endif | |
__libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up; | |
/* Make sure we don't initialize twice. */ | |
if (!__libc_multiple_libcs) | |
{ | |
/* Set the FPU control word to the proper default value if the | |
kernel would use a different value. */ | |
if (__fpu_control != GLRO(dl_fpu_control)) | |
__setfpucw (__fpu_control); | |
} | |
/* Save the command-line arguments. */ | |
__libc_argc = argc; | |
__libc_argv = argv; | |
__environ = envp; | |
#ifndef SHARED | |
__libc_init_secure (); | |
/* First the initialization which normally would be done by the | |
dynamic linker. */ | |
_dl_non_dynamic_init (); | |
#endif | |
#ifdef VDSO_SETUP | |
VDSO_SETUP (); | |
#endif | |
__init_misc (argc, argv, envp); | |
#ifdef USE_NONOPTION_FLAGS | |
/* This is a hack to make the special getopt in GNU libc working. */ | |
__getopt_clean_environment (envp); | |
#endif | |
/* Initialize ctype data. */ | |
__ctype_init (); | |
#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS | |
__libc_global_ctors (); | |
#endif | |
} | |
/* This function is defined here so that if this file ever gets into | |
ld.so we will get a link error. Having this file silently included | |
in ld.so causes disaster, because the _init definition above will | |
cause ld.so to gain an init function, which is not a cool thing. */ | |
extern void _dl_start (void) __attribute__ ((noreturn)); | |
void | |
_dl_start (void) | |
{ | |
abort (); | |
} |