1 /* Initialization code run first thing by the ELF startup code. Linux version.
2 Copyright (C) 1995, 1996, 1997 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 Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
22 #include <fpu_control.h>
23 #include <linux/personality.h>
24 #include <init-first.h>
25 #include <sys/types.h>
27 extern void __libc_init (int, char **, char **);
28 extern void __libc_global_ctors (void);
30 /* The function is called from assembly stubs the compiler can't see. */
31 static void init (int, char **, char **) __attribute__ ((unused));
33 extern int _dl_starting_up;
34 weak_extern (_dl_starting_up)
36 /* Set nonzero if we have to be prepared for more then one libc being
37 used in the process. Safe assumption if initializer never runs. */
38 int __libc_multiple_libcs = 1;
40 /* Remember the command line argument and enviroment contents for
41 later calls of initializers for dynamic libraries. */
45 /* We often need the PID. Cache this value. */
46 pid_t __libc_pid = 0xf00baa;
50 init (int argc, char **argv, char **envp)
52 extern int __personality (int);
53 extern void __getopt_clean_environment (char **);
55 /* We must not call `personality' twice. */
56 if (!__libc_multiple_libcs)
58 /* The `personality' system call takes one argument that chooses
59 the "personality", i.e. the set of system calls and such. We
60 must make this call first thing to disable emulation of some
61 other system that might have been enabled by default based on
62 the executable format. */
63 __personality (PER_LINUX);
65 /* Set the FPU control word to the proper default value. */
66 __setfpucw (__fpu_control);
69 /* Save the command-line arguments. */
74 __libc_init (argc, argv, envp);
76 /* This is a hack to make the special getopt in GNU libc working. */
77 __getopt_clean_environment (envp);
80 __libc_global_ctors ();
86 SYSDEP_CALL_INIT(_init, init);
89 __libc_init_first (void)
95 SYSDEP_CALL_INIT(__libc_init_first, init);
100 /* This function is defined here so that if this file ever gets into
101 ld.so we will get a link error. Having this file silently included
102 in ld.so causes disaster, because the _init definition above will
103 cause ld.so to gain an init function, which is not a cool thing. */