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118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
/* Copyright (C) 1995, 1996, 1997, 1998, 2002, 2004, 2007, 2008
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <limits.h>
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#include <sys/time.h>
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#include <sys/timex.h>
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#include <kernel-features.h>
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#define MAX_SEC (INT_MAX / 1000000L - 2)
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#define MIN_SEC (INT_MIN / 1000000L + 2)
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#ifndef MOD_OFFSET
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#define modes mode
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#endif
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#ifndef TIMEVAL
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#define TIMEVAL timeval
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#endif
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#ifndef TIMEX
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#define TIMEX timex
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#endif
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#ifndef ADJTIME
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#define ADJTIME __adjtime
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#endif
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#ifndef ADJTIMEX
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#define NO_LOCAL_ADJTIME
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#define ADJTIMEX(x) INTUSE(__adjtimex) (x)
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extern int INTUSE(__adjtimex) (struct timex *__ntx);
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#endif
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#ifndef LINKAGE
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#define LINKAGE
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#endif
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LINKAGE int
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ADJTIME (const struct TIMEVAL *itv, struct TIMEVAL *otv)
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{
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struct TIMEX tntx;
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if (itv)
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{
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struct TIMEVAL tmp;
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/* We will do some check here. */
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tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L;
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tmp.tv_usec = itv->tv_usec % 1000000L;
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if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC)
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{
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__set_errno (EINVAL);
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return -1;
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}
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tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L;
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tntx.modes = ADJ_OFFSET_SINGLESHOT;
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}
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else
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{
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#ifdef ADJ_OFFSET_SS_READ
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tntx.modes = ADJ_OFFSET_SS_READ;
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#else
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tntx.modes = 0;
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#endif
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}
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#if defined ADJ_OFFSET_SS_READ && !defined __ASSUME_ADJ_OFFSET_SS_READ
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again:
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#endif
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if (__builtin_expect (ADJTIMEX (&tntx) < 0, 0))
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{
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#if defined ADJ_OFFSET_SS_READ && !defined __ASSUME_ADJ_OFFSET_SS_READ
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if (itv && errno == EINVAL && tntx.modes == ADJ_OFFSET_SS_READ)
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{
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tntx.modes = ADJ_OFFSET_SINGLESHOT;
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goto again;
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}
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#endif
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return -1;
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}
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if (otv)
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{
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if (tntx.offset < 0)
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{
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otv->tv_usec = -(-tntx.offset % 1000000);
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otv->tv_sec = -(-tntx.offset / 1000000);
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}
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else
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{
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otv->tv_usec = tntx.offset % 1000000;
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otv->tv_sec = tntx.offset / 1000000;
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}
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}
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return 0;
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}
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#ifdef NO_LOCAL_ADJTIME
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weak_alias (__adjtime, adjtime)
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#endif
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