lib/libc/gen/times.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)times.c  8.1 (Berkeley) 6/4/93
  34  * $DragonFly: src/lib/libc/gen/times.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/time.h>
  39 #include <sys/times.h>
  40 #include <sys/resource.h>
  41
  42 /*
  43  * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
  44  * but this would overflow if we switch to nanosec.
  45  */
  46 #define CONVTCK(r)      (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
  47
  48 clock_t
  49 times(struct tms *tp)
  50 {
  51         struct rusage ru;
  52         struct timeval t;
  53
  54         if (getrusage(RUSAGE_SELF, &ru) < 0)
  55                 return ((clock_t)-1);
  56         tp->tms_utime = CONVTCK(ru.ru_utime);
  57         tp->tms_stime = CONVTCK(ru.ru_stime);
  58         if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
  59                 return ((clock_t)-1);
  60         tp->tms_cutime = CONVTCK(ru.ru_utime);
  61         tp->tms_cstime = CONVTCK(ru.ru_stime);
  62         if (gettimeofday(&t, (struct timezone *)0))
  63                 return ((clock_t)-1);
  64         return ((clock_t)(CONVTCK(t)));
  65 }