Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/unix/sysv/linux/init-first.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
139 lines (109 sloc)
3.74 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Initialization code run first thing by the ELF startup code. Linux version. | |
Copyright (C) 1995-1999, 2000, 2001, 2002 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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#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 "kernel-features.h" | |
#include <libc-internal.h> | |
#include <ldsodefs.h> | |
#ifndef SHARED | |
# include "dl-osinfo.h" | |
#endif | |
/* The function is called from assembly stubs the compiler can't see. */ | |
static void init (int, char **, char **) __attribute__ ((unused)); | |
extern int _dl_starting_up; | |
weak_extern (_dl_starting_up) | |
/* Set nonzero if we have to be prepared for more then one libc being | |
used in the process. Safe assumption if initializer never runs. */ | |
int __libc_multiple_libcs = 1; | |
/* Remember the command line argument and enviroment contents for | |
later calls of initializers for dynamic libraries. */ | |
int __libc_argc; | |
char **__libc_argv; | |
static void | |
init (int argc, char **argv, char **envp) | |
{ | |
#ifdef USE_NONOPTION_FLAGS | |
extern void __getopt_clean_environment (char **); | |
#endif | |
/* The next variable is only here to work around a bug in gcc <= 2.7.2.2. | |
If the address would be taken inside the expression the optimizer | |
would try to be too smart and throws it away. Grrr. */ | |
int *dummy_addr = &_dl_starting_up; | |
__libc_multiple_libcs = dummy_addr && !_dl_starting_up; | |
/* Make sure we don't initialize twice. */ | |
if (!__libc_multiple_libcs) | |
{ | |
#ifndef SHARED | |
DL_SYSDEP_OSCHECK (__libc_fatal); | |
#endif | |
/* Set the FPU control word to the proper default value if the | |
kernel would use a different value. (In a static program we | |
don't have this information.) */ | |
#ifdef SHARED | |
if (__fpu_control != GL(dl_fpu_control)) | |
#endif | |
__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 | |
__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 | |
#ifdef SHARED | |
__libc_global_ctors (); | |
#endif | |
} | |
#ifdef SHARED | |
strong_alias (init, _init); | |
extern void __libc_init_first (void); | |
void | |
__libc_init_first (void) | |
{ | |
} | |
#else | |
extern void __libc_init_first (int argc, char **argv, char **envp); | |
void | |
__libc_init_first (int argc, char **argv, char **envp) | |
{ | |
init (argc, argv, envp); | |
} | |
#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 (); | |
} |