lib/libc/gen/times.c

   1 /*      $NetBSD: times.c,v 1.15 2009/01/11 02:46:27 christos Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)times.c     8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: times.c,v 1.15 2009/01/11 02:46:27 christos Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include "namespace.h"
  42 #include <sys/param.h>
  43 #include <sys/time.h>
  44 #include <sys/times.h>
  45 #include <sys/resource.h>
  46
  47 #include <assert.h>
  48 #include <errno.h>
  49 #include <time.h>
  50
  51 /*
  52  * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
  53  * but this would overflow if we switch to nanosec.
  54  */
  55 #define CONVTCK(r)      \
  56     (clock_t)(r.tv_sec * clk_tck + r.tv_usec / (1000000 / (uint)clk_tck))
  57
  58 #ifndef __times_rusage
  59 #define __times_rusage struct rusage
  60 #endif
  61 #ifndef __times_timeval
  62 #define __times_timeval struct timeval
  63 #endif
  64
  65 clock_t
  66 times(struct tms *tp)
  67 {
  68         __times_rusage ru;
  69         __times_timeval t;
  70         static clock_t clk_tck;
  71
  72         _DIAGASSERT(tp != NULL);
  73
  74         /*
  75          * we use a local copy of CLK_TCK because it expands to a
  76          * moderately expensive function call.
  77          */
  78         if (clk_tck == 0)
  79                 clk_tck = (clock_t)CLK_TCK;
  80
  81         if (getrusage(RUSAGE_SELF, &ru) < 0)
  82                 return ((clock_t)-1);
  83         tp->tms_utime = CONVTCK(ru.ru_utime);
  84         tp->tms_stime = CONVTCK(ru.ru_stime);
  85         if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
  86                 return ((clock_t)-1);
  87         tp->tms_cutime = CONVTCK(ru.ru_utime);
  88         tp->tms_cstime = CONVTCK(ru.ru_stime);
  89         if (gettimeofday(&t, (struct timezone *)0))
  90                 return ((clock_t)-1);
  91         return ((clock_t)(CONVTCK(t)));
  92 }