sysdeps/unix/sysv/linux/adjtime.c

   1 /* Copyright (C) 1995, 1996, 1997, 1998, 2002, 2004
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <sys/time.h>
  23 #include <sys/timex.h>
  24
  25 #define MAX_SEC (INT_MAX / 1000000L - 2)
  26 #define MIN_SEC (INT_MIN / 1000000L + 2)
  27
  28 #ifndef MOD_OFFSET
  29 #define modes mode
  30 #endif
  31
  32 #ifndef TIMEVAL
  33 #define TIMEVAL timeval
  34 #endif
  35
  36 #ifndef TIMEX
  37 #define TIMEX timex
  38 #endif
  39
  40 #ifndef ADJTIME
  41 #define ADJTIME __adjtime
  42 #endif
  43
  44 #ifndef ADJTIMEX
  45 #define NO_LOCAL_ADJTIME
  46 #define ADJTIMEX(x) INTUSE(__adjtimex) (x)
  47 extern int INTUSE(__adjtimex) (struct timex *__ntx);
  48 #endif
  49
  50 #ifndef LINKAGE
  51 #define LINKAGE
  52 #endif
  53
  54 LINKAGE int
  55 ADJTIME (const struct TIMEVAL *itv, 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)
  78     return -1;
  79
  80   if (otv)
  81     {
  82       if (tntx.offset < 0)
  83         {
  84           otv->tv_usec = -(-tntx.offset % 1000000);
  85           otv->tv_sec  = -(-tntx.offset / 1000000);
  86         }
  87       else
  88         {
  89           otv->tv_usec = tntx.offset % 1000000;
  90           otv->tv_sec  = tntx.offset / 1000000;
  91         }
  92     }
  93   return 0;
  94 }
  95
  96 #ifdef NO_LOCAL_ADJTIME
  97 weak_alias (__adjtime, adjtime)
  98 #endif