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glibc/sysdeps/unix/sysv/linux/adjtime.c
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/* Copyright (C) 1995-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <limits.h> | |
#include <sys/time.h> | |
#include <sys/timex.h> | |
#define MAX_SEC (INT_MAX / 1000000L - 2) | |
#define MIN_SEC (INT_MIN / 1000000L + 2) | |
#ifndef MOD_OFFSET | |
#define modes mode | |
#endif | |
#ifndef TIMEVAL | |
#define TIMEVAL timeval | |
#endif | |
#ifndef TIMEX | |
#define TIMEX timex | |
#endif | |
#ifndef ADJTIME | |
#define ADJTIME __adjtime | |
#endif | |
#ifndef ADJTIMEX | |
#define NO_LOCAL_ADJTIME | |
#define ADJTIMEX(x) __adjtimex (x) | |
#endif | |
#ifndef LINKAGE | |
#define LINKAGE | |
#endif | |
LINKAGE int | |
ADJTIME (const struct TIMEVAL *itv, struct TIMEVAL *otv) | |
{ | |
struct TIMEX tntx; | |
if (itv) | |
{ | |
struct TIMEVAL tmp; | |
/* We will do some check here. */ | |
tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L; | |
tmp.tv_usec = itv->tv_usec % 1000000L; | |
if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC) | |
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); | |
tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L; | |
tntx.modes = ADJ_OFFSET_SINGLESHOT; | |
} | |
else | |
tntx.modes = ADJ_OFFSET_SS_READ; | |
if (__glibc_unlikely (ADJTIMEX (&tntx) < 0)) | |
return -1; | |
if (otv) | |
{ | |
if (tntx.offset < 0) | |
{ | |
otv->tv_usec = -(-tntx.offset % 1000000); | |
otv->tv_sec = -(-tntx.offset / 1000000); | |
} | |
else | |
{ | |
otv->tv_usec = tntx.offset % 1000000; | |
otv->tv_sec = tntx.offset / 1000000; | |
} | |
} | |
return 0; | |
} | |
#ifdef NO_LOCAL_ADJTIME | |
weak_alias (__adjtime, adjtime) | |
#endif |