/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ #include "timeval.h" #if defined(WIN32) && !defined(MSDOS) struct timeval curlx_tvnow(void) { /* ** GetTickCount() is available on _all_ Windows versions from W95 up ** to nowadays. Returns milliseconds elapsed since last system boot, ** increases monotonically and wraps once 49.7 days have elapsed. */ struct timeval now; #if !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_VISTA) || \ (_WIN32_WINNT < _WIN32_WINNT_VISTA) DWORD milliseconds = GetTickCount(); now.tv_sec = milliseconds / 1000; now.tv_usec = (milliseconds % 1000) * 1000; #else ULONGLONG milliseconds = GetTickCount64(); now.tv_sec = (long) (milliseconds / 1000); now.tv_usec = (long) (milliseconds % 1000) * 1000; #endif return now; } #elif defined(HAVE_CLOCK_GETTIME_MONOTONIC) struct timeval curlx_tvnow(void) { /* ** clock_gettime() is granted to be increased monotonically when the ** monotonic clock is queried. Time starting point is unspecified, it ** could be the system start-up time, the Epoch, or something else, ** in any case the time starting point does not change once that the ** system has started up. */ struct timeval now; struct timespec tsnow; if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) { now.tv_sec = tsnow.tv_sec; now.tv_usec = tsnow.tv_nsec / 1000; } /* ** Even when the configure process has truly detected monotonic clock ** availability, it might happen that it is not actually available at ** run-time. When this occurs simply fallback to other time source. */ #ifdef HAVE_GETTIMEOFDAY else (void)gettimeofday(&now, NULL); #else else { now.tv_sec = (long)time(NULL); now.tv_usec = 0; } #endif return now; } #elif defined(HAVE_GETTIMEOFDAY) struct timeval curlx_tvnow(void) { /* ** gettimeofday() is not granted to be increased monotonically, due to ** clock drifting and external source time synchronization it can jump ** forward or backward in time. */ struct timeval now; (void)gettimeofday(&now, NULL); return now; } #else struct timeval curlx_tvnow(void) { /* ** time() returns the value of time in seconds since the Epoch. */ struct timeval now; now.tv_sec = (long)time(NULL); now.tv_usec = 0; return now; } #endif /* * Make sure that the first argument is the more recent time, as otherwise * we'll get a weird negative time-diff back... * * Returns: the time difference in number of milliseconds. For large diffs it * returns 0x7fffffff on 32bit time_t systems. */ long curlx_tvdiff(struct timeval newer, struct timeval older) { #if SIZEOF_TIME_T < 8 /* for 32bit time_t systems, add a precaution to avoid overflow for really big time differences */ time_t diff = newer.tv_sec-older.tv_sec; if(diff >= (0x7fffffff/1000)) return 0x7fffffff; #endif return (newer.tv_sec-older.tv_sec)*1000+ (long)(newer.tv_usec-older.tv_usec)/1000; } /* * Same as curlx_tvdiff but with full usec resolution. * * Returns: the time difference in seconds with subsecond resolution. */ double curlx_tvdiff_secs(struct timeval newer, struct timeval older) { if(newer.tv_sec != older.tv_sec) return (double)(newer.tv_sec-older.tv_sec)+ (double)(newer.tv_usec-older.tv_usec)/1000000.0; else return (double)(newer.tv_usec-older.tv_usec)/1000000.0; } /* return the number of seconds in the given input timeval struct */ long Curl_tvlong(struct timeval t1) { return t1.tv_sec; }