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| author | Remko Tronçon <git@el-tramo.be> | 2009-12-03 20:06:33 (GMT) |
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| committer | Remko Tronçon <git@el-tramo.be> | 2009-12-03 20:06:33 (GMT) |
| commit | 5df50c35e1baeee517a0895a2c8a2cc2052b087f (patch) | |
| tree | b9d90fd123ec251ebb930cfcfaa2ffc805433812 /3rdParty/CAres/src/ares__timeval.c | |
| parent | 9b3edba27b8683f1a87ad66ee05802dd93bbbdfc (diff) | |
| download | swift-contrib-5df50c35e1baeee517a0895a2c8a2cc2052b087f.zip swift-contrib-5df50c35e1baeee517a0895a2c8a2cc2052b087f.tar.bz2 | |
Added C-Ares.
Diffstat (limited to '3rdParty/CAres/src/ares__timeval.c')
| -rw-r--r-- | 3rdParty/CAres/src/ares__timeval.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/3rdParty/CAres/src/ares__timeval.c b/3rdParty/CAres/src/ares__timeval.c new file mode 100644 index 0000000..2957350 --- /dev/null +++ b/3rdParty/CAres/src/ares__timeval.c @@ -0,0 +1,112 @@ +/* $Id: ares__timeval.c,v 1.6 2009-11-02 11:55:53 yangtse Exp $ */ + +/* Copyright (C) 2008 by Daniel Stenberg et al + * + * Permission to use, copy, modify, and distribute this software and its + * documentation for any purpose and without fee is hereby granted, provided + * that the above copyright notice appear in all copies and that both that + * copyright notice and this permission notice appear in supporting + * documentation, and that the name of M.I.T. not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. M.I.T. makes no representations about the + * suitability of this software for any purpose. It is provided "as is" + * without express or implied warranty. + */ + +#include "ares_setup.h" +#include "ares.h" +#include "ares_private.h" + +#if defined(WIN32) && !defined(MSDOS) + +struct timeval ares__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; + DWORD milliseconds = GetTickCount(); + now.tv_sec = milliseconds / 1000; + now.tv_usec = (milliseconds % 1000) * 1000; + return now; +} + +#elif defined(HAVE_CLOCK_GETTIME_MONOTONIC) + +struct timeval ares__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 ares__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 ares__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 + +#if 0 /* Not used */ +/* + * 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. + */ +long ares__tvdiff(struct timeval newer, struct timeval older) +{ + return (newer.tv_sec-older.tv_sec)*1000+ + (newer.tv_usec-older.tv_usec)/1000; +} +#endif + |