80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* safeunistd.h: <unistd.h>, but with compat. and large file support for MSVC.
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*
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* Copyright (C) 2007 Olly Betts
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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* USA
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*/
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#ifndef XAPIAN_INCLUDED_SAFEUNISTD_H
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#define XAPIAN_INCLUDED_SAFEUNISTD_H
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#ifndef _MSC_VER
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# include <unistd.h>
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#else
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// sys/types.h has a typedef for off_t so make sure we've seen that before
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// we hide it behind a #define.
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# include <sys/types.h>
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// MSVC doesn't even HAVE unistd.h - io.h seems the nearest equivalent.
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// We also need to do some renaming of functions to get versions which
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// work on large files.
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# include <io.h>
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# ifdef lseek
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# undef lseek
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# endif
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# ifdef off_t
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# undef off_t
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# endif
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# define lseek(FD, OFF, WHENCE) _lseeki64(FD, OFF, WHENCE)
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# define off_t __int64
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// process.h is needed for getpid().
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# include <process.h>
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#endif
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#ifdef __WIN32__
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#ifdef _MSC_VER
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/* Recent MinGW versions define this */
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inline unsigned int
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sleep(unsigned int seconds)
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{
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// Use our own little helper function to avoid pulling in <windows.h>.
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extern void xapian_sleep_milliseconds(unsigned int millisecs);
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// Sleep takes a time interval in milliseconds, whereas POSIX sleep takes
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// a time interval in seconds, so we need to multiply 'seconds' by 1000.
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//
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// But make sure the multiplication won't overflow! 4294967 seconds is
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// nearly 50 days, so just sleep for that long and return the number of
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// seconds left to sleep for. The common case of sleep(CONSTANT) should
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// optimise to just xapian_sleep_milliseconds(CONSTANT).
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if (seconds > 4294967u) {
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xapian_sleep_milliseconds(4294967000u);
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return seconds - 4294967u;
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}
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xapian_sleep_milliseconds(seconds * 1000u);
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return 0;
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}
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#endif /* _MSC_VER*/
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#endif /* __WIN32__ */
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#endif /* XAPIAN_INCLUDED_SAFEUNISTD_H */
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