sysdeps/unix/sysv/linux/adjtime.c

   1 /* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <limits.h>
  21 #include <sys/time.h>
  22 #include <sys/timex.h>
  23
  24 #define MAX_SEC (INT_MAX / 1000000L - 2)
  25 #define MIN_SEC (INT_MIN / 1000000L + 2)
  26
  27 #ifndef MOD_OFFSET
  28 #define modes mode
  29 #endif
  30
  31 #ifndef TIMEVAL
  32 #define TIMEVAL timeval
  33 #endif
  34
  35 #ifndef TIMEX
  36 #define TIMEX timex
  37 #endif
  38
  39 #ifndef ADJTIME
  40 #define ADJTIME __adjtime
  41 #endif
  42
  43 #ifndef ADJTIMEX
  44 #define NO_LOCAL_ADJTIME
  45 #define ADJTIMEX(x) __adjtimex (x)
  46 #endif
  47
  48 #ifndef LINKAGE
  49 #define LINKAGE
  50 #endif
  51
  52 LINKAGE int
  53 ADJTIME (itv, otv)
  54      const struct TIMEVAL *itv;
  55      struct TIMEVAL *otv;
  56 {
  57   struct TIMEX tntx;
  58
  59   if (itv)
  60     {
  61       struct TIMEVAL tmp;
  62
  63       /* We will do some check here. */
  64       tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L;
  65       tmp.tv_usec = itv->tv_usec % 1000000L;
  66       if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC)
  67         {
  68           __set_errno (EINVAL);
  69           return -1;
  70         }
  71       tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L;
  72       tntx.modes = ADJ_OFFSET_SINGLESHOT;
  73     }
  74   else
  75     tntx.modes = 0;
  76
  77   if (ADJTIMEX (&tntx) < 0) return -1;
  78
  79   if (otv)
  80     {
  81       if (tntx.offset < 0)
  82         {
  83           otv->tv_usec = -(-tntx.offset % 1000000);
  84           otv->tv_sec  = -(-tntx.offset / 1000000);
  85         }
  86       else
  87         {
  88           otv->tv_usec = tntx.offset % 1000000;
  89           otv->tv_sec  = tntx.offset / 1000000;
  90         }
  91     }
  92   return 0;
  93 }
  94
  95 #ifdef NO_LOCAL_ADJTIME
  96 weak_alias (__adjtime, adjtime)
  97 #endif