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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)times.c  8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libc/gen/times.c,v 1.4 2007/01/09 00:27:55 imp Exp $
  31  * $DragonFly: src/lib/libc/gen/times.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/time.h>
  36 #include <sys/times.h>
  37 #include <sys/resource.h>
  38
  39 /*
  40  * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
  41  * but this would overflow if we switch to nanosec.
  42  */
  43 #define CONVTCK(r)      (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
  44
  45 clock_t
  46 times(struct tms *tp)
  47 {
  48         struct rusage ru;
  49         struct timespec t;
  50         clock_t c;
  51
  52         if (getrusage(RUSAGE_SELF, &ru) < 0)
  53                 return ((clock_t)-1);
  54         tp->tms_utime = CONVTCK(ru.ru_utime);
  55         tp->tms_stime = CONVTCK(ru.ru_stime);
  56         if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
  57                 return ((clock_t)-1);
  58         tp->tms_cutime = CONVTCK(ru.ru_utime);
  59         tp->tms_cstime = CONVTCK(ru.ru_stime);
  60         if (clock_gettime(CLOCK_MONOTONIC, &t))
  61                 return ((clock_t)-1);
  62         c = t.tv_sec * CLK_TCK + t.tv_nsec / (1000000000 / CLK_TCK);
  63         return (c);
  64 }