mirror of https://github.com/getdnsapi/getdns.git
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
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* Copyright (c) 2016 Christian Huitema <huitema@huitema.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Numerous places in the code make reference to the Unix/Linux
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* "gettimeofday()" function, which is not available in the standard
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* windows libraries. This code provides a compatible implementation.
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*/
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#include "config.h"
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#ifdef GETDNS_ON_WINDOWS
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int gettimeofday(struct timeval* tv, struct timezone* tz)
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{
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FILETIME ft;
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uint64_t now = 0;
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/*
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* The GetSystemTimeAsFileTime API returns the number
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* of 100-nanosecond intervals since January 1, 1601 (UTC),
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* in FILETIME format.
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*/
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GetSystemTimeAsFileTime(&ft);
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/*
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* Convert to plain 64 bit format, without making
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* assumptions about the FILETIME structure alignment.
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*/
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now |= ft.dwHighDateTime;
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now <<= 32;
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now |= ft.dwLowDateTime;
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/*
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* Convert units from 100ns to 1us
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*/
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now /= 10;
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/*
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* Account for microseconds elapsed between 1601 and 1970.
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*/
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now -= 11644473600000000ULL;
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if (tv != NULL)
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{
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uint64_t sec = now / 1000000;
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uint64_t usec = now % 1000000;
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tv->tv_sec = (long)sec;
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tv->tv_usec = (long)usec;
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}
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if (tz != NULL)
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{
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/*
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* TODO: implement a timezone retrieval function.
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* Not urgent, since the GetDNS code always set this parameter to NULL.
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*/
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return -1;
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}
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return 0;
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}
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#endif /* GETDNS_ON_WINDOWS */ |