1  /* Copyright (C) 1995-2023 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 Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the 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     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <limits.h>
      20  #include <sys/time.h>
      21  #include <sys/timex.h>
      22  #include <sysdep.h>
      23  
      24  #define MAX_SEC	(INT_MAX / 1000000L - 2)
      25  #define MIN_SEC	(INT_MIN / 1000000L + 2)
      26  
      27  int
      28  __adjtime64 (const struct __timeval64 *itv, struct __timeval64 *otv)
      29  {
      30    struct __timex64 tntx;
      31  
      32    if (itv)
      33      {
      34        struct __timeval64 tmp;
      35  
      36        /* We will do some check here. */
      37        tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L;
      38        tmp.tv_usec = itv->tv_usec % 1000000L;
      39        if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC)
      40  	return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
      41        tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L;
      42        tntx.modes = ADJ_OFFSET_SINGLESHOT;
      43      }
      44    else
      45      tntx.modes = ADJ_OFFSET_SS_READ;
      46  
      47    if (__glibc_unlikely (__clock_adjtime64 (CLOCK_REALTIME, &tntx) < 0))
      48      return -1;
      49  
      50    if (otv)
      51      {
      52        if (tntx.offset < 0)
      53  	{
      54  	  otv->tv_usec = -(-tntx.offset % 1000000);
      55  	  otv->tv_sec  = -(-tntx.offset / 1000000);
      56  	}
      57        else
      58  	{
      59  	  otv->tv_usec = tntx.offset % 1000000;
      60  	  otv->tv_sec  = tntx.offset / 1000000;
      61  	}
      62      }
      63    return 0;
      64  }
      65  
      66  #if __TIMESIZE != 64
      67  libc_hidden_def (__adjtime64)
      68  
      69  int
      70  __adjtime (const struct timeval *itv, struct timeval *otv)
      71  {
      72    struct __timeval64 itv64, *pitv64 = NULL;
      73    struct __timeval64 otv64;
      74    int retval;
      75  
      76    if (itv != NULL)
      77      {
      78        itv64 = valid_timeval_to_timeval64 (*itv);
      79        pitv64 = &itv64;
      80      }
      81    retval = __adjtime64 (pitv64, otv != NULL ? &otv64 : NULL);
      82    if (otv != NULL)
      83      *otv = valid_timeval64_to_timeval (otv64);
      84  
      85    return retval;
      86  }
      87  #endif
      88  
      89  #ifdef VERSION_adjtime
      90  weak_alias (__adjtime, __wadjtime);
      91  default_symbol_version (__wadjtime, adjtime, VERSION_adjtime);
      92  #else
      93  weak_alias (__adjtime, adjtime)
      94  #endif