safeunistd.h

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/* Copyright (C) 2007,2015 Olly Betts
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see
 * <https://www.gnu.org/licenses/>.
 */
 
#ifndef XAPIAN_INCLUDED_SAFEUNISTD_H
#define XAPIAN_INCLUDED_SAFEUNISTD_H
 
#ifndef PACKAGE
# error config.h must be included first in each C++ source file
#endif
 
#ifndef _MSC_VER
# include <unistd.h>
#else
 
// io.h is the nearest equivalent to unistd.h.
# include <io.h>
 
// process.h is needed for getpid().
# include <process.h>
 
// direct.h is needed for rmdir().
# include <direct.h>
 
#endif
 
// Under mingw we probably don't need to provide our own sleep().
#if defined __WIN32__ && !defined HAVE_SLEEP
 
inline unsigned int
sleep(unsigned int seconds)
{
    // Use our own little helper function to avoid pulling in <windows.h>.
    extern void xapian_sleep_milliseconds(unsigned int millisecs);
 
    // Sleep takes a time interval in milliseconds, whereas POSIX sleep takes
    // a time interval in seconds, so we need to multiply 'seconds' by 1000.
    //
    // But make sure the multiplication won't overflow!  4294967 seconds is
    // nearly 50 days, so just sleep for that long and return the number of
    // seconds left to sleep for.  The common case of sleep(CONSTANT) should
    // optimise to just xapian_sleep_milliseconds(CONSTANT).
    if (seconds > 4294967u) {
        xapian_sleep_milliseconds(4294967000u);
        return seconds - 4294967u;
    }
    xapian_sleep_milliseconds(seconds * 1000u);
    return 0;
}
 
#endif
 
#endif /* XAPIAN_INCLUDED_SAFEUNISTD_H */