1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/* Initialization code run first thing by the ELF startup code. Linux version.
Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sysdep.h>
#include <fpu_control.h>
#include <init-first.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include "kernel-features.h"
extern void __libc_init_secure (void);
extern void __libc_init (int, char **, char **);
extern void __libc_global_ctors (void);
/* The function is called from assembly stubs the compiler can't see. */
static void init (int, char **, char **) __attribute__ ((unused));
/* The function we use to get the kernel revision. */
extern int __sysctl (int *name, int nlen, void *oldval, size_t *oldlenp,
void *newval, size_t newlen);
extern int _dl_starting_up;
weak_extern (_dl_starting_up)
extern fpu_control_t _dl_fpu_control;
extern int _dl_fpu_control_set;
/* 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)
{
extern void __getopt_clean_environment (char **);
/* Make sure we don't initialize twice. */
if (!__libc_multiple_libcs)
{
/* Test whether the kernel is new enough. This test is only
performed if the library is not compiled to run on all
kernels. */
if (__LINUX_KERNEL_VERSION > 0)
{
static const int sysctl_args[] = { CTL_KERN, KERN_OSRELEASE };
char buf[64];
size_t reslen = sizeof (buf);
unsigned int version;
int parts;
char *cp;
/* Try reading the number using `sysctl' first. */
if (__sysctl ((int *) sysctl_args,
sizeof (sysctl_args) / sizeof (sysctl_args[0]),
buf, &reslen, NULL, 0) < 0)
{
/* This was not successful. Now try reading the /proc
filesystem. */
int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY);
if (fd == -1
|| (reslen = __read (fd, buf, sizeof (buf))) <= 0)
/* This also didn't work. We give up since we cannot
make sure the library can actually work. */
__libc_fatal ("FATAL: cannot determine library version\n");
__close (fd);
}
buf[MIN (reslen, sizeof (buf) - 1)] = '\0';
/* Now convert it into a number. The string consists of at most
three parts. */
version = 0;
parts = 0;
cp = buf;
while ((*cp >= '0') && (*cp <= '9'))
{
unsigned int here = *cp++ - '0';
while ((*cp >= '0') && (*cp <= '9'))
{
here *= 10;
here += *cp++ - '0';
}
++parts;
version <<= 8;
version |= here;
if (*cp++ != '.')
/* Another part following? */
break;
}
if (parts < 3)
version <<= 8 * (3 - parts);
/* Now we can test with the required version. */
if (version < __LINUX_KERNEL_VERSION)
/* Not sufficent. */
__libc_fatal ("FATAL: kernel too old\n");
}
/* 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 PIC
if (__fpu_control != _dl_fpu_control)
#endif
__setfpucw (__fpu_control);
}
/* Save the command-line arguments. */
__libc_argc = argc;
__libc_argv = argv;
__environ = envp;
#ifndef PIC
__libc_init_secure ();
#endif
__libc_init (argc, argv, envp);
/* This is a hack to make the special getopt in GNU libc working. */
__getopt_clean_environment (envp);
#ifdef PIC
__libc_global_ctors ();
#endif
}
#ifdef PIC
SYSDEP_CALL_INIT(_init, init);
void
__libc_init_first (void)
{
}
#else
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. */
void
_dl_start (void)
{
abort ();
}
|
