release/src/router/apcupsd/src/lib/autil.cpp

   1 /*
   2  * autil.cpp
   3  *
   4  * Common helper routines for a* classes.
   5  */
   6
   7 /*
   8  * Copyright (C) 2007 Adam Kropelin
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of version 2 of the GNU General
  12  * Public License as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public
  20  * License along with this program; if not, write to the Free
  21  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  22  * MA 02111-1307, USA.
  23  */
  24
  25 #include "autil.h"
  26 #include "apc.h"
  27
  28 void calc_abstimeout(int msec, struct timespec *abstime)
  29 {
  30       // It would be best to use clock_gettime here, but it is not
  31       // widely available, so use gettimeofday() which we can count on
  32       // being available, if not quite as accurate.
  33       struct timeval now;
  34       gettimeofday(&now, NULL);
  35       abstime->tv_sec = now.tv_sec + msec/1000;
  36       abstime->tv_nsec = now.tv_usec*1000 + (msec % 1000) * 1000000;
  37       if (abstime->tv_nsec >= 1000000000) {
  38          abstime->tv_sec++;
  39          abstime->tv_nsec -= 1000000000;
  40       }
  41 }