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
|
/* Get frequency of the system processor. i386/Linux version.
Copyright (C) 2000 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 <ctype.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <libc-internal.h>
unsigned long long int
__get_clockfreq (void)
{
/* We read the information from the /proc filesystem. It contains at
least one line like
cpu MHz : 497.840237
We search for this line and convert the number in an integer. */
static unsigned long long int result;
int fd;
/* If this function was called before, we know the result. */
if (result != 0)
return result;
fd = open ("/proc/cpuinfo", O_RDONLY);
if (__builtin_expect (fd != -1, 1))
{
/* XXX AFAIK the /proc filesystem can generate "files" only up
to a size of 4096 bytes. */
char buf[4096];
ssize_t n;
n = read (fd, buf, sizeof buf);
if (__builtin_expect (n, 1) > 0)
{
char *mhz = memmem (buf, n, "cpu MHz", 7);
if (__builtin_expect (mhz != NULL, 1))
{
char *endp = buf + n;
/* Search for the beginning of the string. */
while (mhz < endp && (*mhz < '0' || *mhz > '9') && *mhz != '\n')
++mhz;
while (mhz < endp && *mhz != '\n')
{
if (*mhz >= '0' && *mhz <= '9')
{
result *= 10;
result += *mhz - '0';
}
++mhz;
}
}
}
close (fd);
}
return result;
}
|
