41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
46 lines
1.8 KiB
C
46 lines
1.8 KiB
C
/* Copyright (C) 1991, 1992, 1996, 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 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 <sys/times.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
/* Return the time used by the program so far (user time + system time). */
|
|
clock_t
|
|
clock (void)
|
|
{
|
|
struct tms buf;
|
|
long clk_tck = __sysconf (_SC_CLK_TCK);
|
|
|
|
/* We don't check for errors here. The only error the kernel
|
|
returns is EFAULT if the value cannot be written to the struct we
|
|
pass a pointer to. Otherwise the kernel returns an `unsigned
|
|
long' value which is the number of jiffies since system start.
|
|
But this number can be negative (when read as `long') when the
|
|
system is up for some time. Ignoring errors should therefore
|
|
have no negative impacts but solve the problem. */
|
|
__times (&buf);
|
|
|
|
return
|
|
(clk_tck <= CLOCKS_PER_SEC)
|
|
? ((unsigned long) buf.tms_utime + buf.tms_stime) * (CLOCKS_PER_SEC
|
|
/ clk_tck)
|
|
: ((unsigned long) buf.tms_utime + buf.tms_stime) / (clk_tck
|
|
/ CLOCKS_PER_SEC);
|
|
}
|