lib/sh/times.c

   1 /* times.c - times(3) library function */
   2
   3 /* Copyright (C) 1999 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <config.h>
  22
  23 #if !defined (HAVE_TIMES)
  24
  25 #include <sys/types.h>
  26 #include <posixtime.h>
  27 #include <systimes.h>
  28
  29 #if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_GETRUSAGE)
  30 #  include <sys/resource.h>
  31 #endif /* HAVE_SYS_RESOURCE_H && HAVE_GETRUSAGE */
  32
  33 extern long     get_clk_tck __P((void));
  34
  35 #define CONVTCK(r)      (r.tv_sec * clk_tck + r.tv_usec / (1000000 / clk_tck))
  36
  37 clock_t
  38 times(tms)
  39         struct tms *tms;
  40 {
  41         clock_t rv;
  42         static long clk_tck = -1;
  43
  44 #if defined (HAVE_GETRUSAGE)
  45         struct timeval tv;
  46         struct rusage ru;
  47
  48         if (clk_tck == -1)
  49                 clk_tck = get_clk_tck();
  50
  51         if (getrusage(RUSAGE_SELF, &ru) < 0)
  52                 return ((clock_t)-1);
  53         tms->tms_utime = CONVTCK(ru.ru_utime);
  54         tms->tms_stime = CONVTCK(ru.ru_stime);
  55
  56         if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
  57                 return ((clock_t)-1);
  58         tms->tms_cutime = CONVTCK(ru.ru_utime);
  59         tms->tms_cstime = CONVTCK(ru.ru_stime);
  60
  61         if (gettimeofday(&tv, (struct timezone *) 0) < 0)
  62                 return ((clock_t)-1);
  63         rv = (clock_t)(CONVTCK(tv));
  64 #else /* !HAVE_GETRUSAGE */
  65         if (clk_tck == -1)
  66                 clk_tck = get_clk_tck();
  67
  68         /* We can't do anything. */
  69         tms->tms_utime = tms->tms_stime = (clock_t)0;
  70         tms->tms_cutime = tms->tms_cstime = (clock_t)0;
  71
  72         rv = (clock_t)time((time_t *)0) * clk_tck;
  73 # endif /* HAVE_GETRUSAGE */
  74
  75         return rv;
  76 }
  77 #endif /* !HAVE_TIMES */