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/** @file flint_io.h
* @brief Wrappers for low-level POSIX I/O routines.
*/
/* Copyright (C) 2006,2007 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef XAPIAN_INCLUDED_FLINT_IO_H
#define XAPIAN_INCLUDED_FLINT_IO_H
#include <sys/types.h>
#include "safefcntl.h"
#include "safeunistd.h"
/** Ensure all data previously written to file descriptor fd has been written to
* disk.
*
* Returns false if this could not be done.
*/
inline bool flint_io_sync(int fd)
{
// If we have it, prefer fdatasync() as it avoids updating the access time
// so is probably a little more efficient.
#if defined HAVE_FDATASYNC
return fdatasync(fd) == 0;
#elif defined HAVE_FSYNC
return fsync(fd) == 0;
#elif defined __WIN32__
return _commit(fd) == 0;
#else
# error Cannot implement flint_io_sync() without fdatasync(), fsync(), or _commit()
#endif
}
/** Read n bytes (or until EOF) into block pointed to by p from file descriptor
* fd.
*
* If less than min bytes are read, throw an exception.
*
* Returns the number of bytes actually read.
*/
size_t flint_io_read(int fd, char * p, size_t n, size_t min);
/** Write n bytes from block pointed to by p to file descriptor fd. */
void flint_io_write(int fd, const char * p, size_t n);
#endif
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