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72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/* Copyright (C) 1991-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stddef.h>
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#include <sys/resource.h>
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#include <sys/times.h>
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#include <sys/time.h>
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#include <time.h>
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/* Time the program started. */
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extern time_t _posix_start_time;
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#ifdef __GNUC__
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__inline
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#endif
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static clock_t
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timeval_to_clock_t (const struct timeval *tv, clock_t clk_tck)
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{
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return (clock_t) ((tv->tv_sec * clk_tck) +
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(tv->tv_usec * clk_tck / 1000000L));
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}
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/* Store the CPU time used by this process and all its
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dead children (and their dead children) in BUFFER.
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Return the elapsed real time, or (clock_t) -1 for errors.
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All times are in CLK_TCKths of a second. */
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clock_t
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__times (buffer)
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struct tms *buffer;
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{
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struct rusage usage;
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clock_t clk_tck;
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if (buffer == NULL)
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{
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__set_errno (EINVAL);
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return (clock_t) -1;
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}
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clk_tck = __getclktck ();
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if (__getrusage (RUSAGE_SELF, &usage) < 0)
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return (clock_t) -1;
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buffer->tms_utime = (clock_t) timeval_to_clock_t (&usage.ru_utime, clk_tck);
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buffer->tms_stime = (clock_t) timeval_to_clock_t (&usage.ru_stime, clk_tck);
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if (__getrusage (RUSAGE_CHILDREN, &usage) < 0)
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return (clock_t) -1;
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buffer->tms_cutime = (clock_t) timeval_to_clock_t (&usage.ru_utime, clk_tck);
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buffer->tms_cstime = (clock_t) timeval_to_clock_t (&usage.ru_stime, clk_tck);
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return (time ((time_t *) NULL) - _posix_start_time) * clk_tck;
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}
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weak_alias (__times, times)
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