e7c036b39e
2000-04-11 Ulrich Drepper <drepper@redhat.com> * posix/globtest.sh: Fix last change. 2000-04-10 Philip Blundell <philb@gnu.org> * sysdeps/unix/sysv/linux/bits/in.h (IPV6_JOIN_GROUP, IPV6_LEAVE_GROUP): New names for IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP. * sysdeps/generic/bits/in.h (IPV6_JOIN_GROUP, IPV6_LEAVE_GROUP): Likewise. 2000-04-11 Ulrich Drepper <drepper@redhat.com> * elf/readlib (process_file): Close streams in case of an error. 2000-04-09 Andreas Jaeger <aj@suse.de> * elf/readlib.c (process_file): Check if file is big enough to contain aout and ELF headers. Reported by Reinhard Moosauer <RMoosauer@steinecker.com>. 2000-04-10 Jes Sorensen <Jes.Sorensen@cern.ch> * elf/dl-fini.c: Include alloca.h to get proper prototype for alloca(). 2000-04-11 Ulrich Drepper <drepper@redhat.com> * test-skeleton.c (main): If STDOUT_UNBUFFERED is defined, make stdout stream unbuffered. * rt/Makefile (tests): Add tst-clock. Add rules to build tst-clock. * rt/tst-clock.c: New file. * sysdeps/unix/i386/i586/clock_getres.c: Correct expression to decide about initialization of nsec. * sysdeps/unix/i386/i586/clock_gettime.c: Correct expression to decide about initialization of freq. Set retval to zero if successful. * sysdeps/unix/sysv/linux/i386/get_clockfreq.c: Cache result.
78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* 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 <unistd.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;
|
|
}
|