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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* Replacement for pwrite for platforms which lack this function. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#ifndef HAVE_PWRITE
#include "pwrite.h"
#ifdef WIN32
/* Replacement pwrite for Win32. */
#include "nbdkit-plugin.h"
#include <windows.h>
ssize_t
pwrite (int fd, const void *buf, size_t count, off_t offset)
{
DWORD r;
OVERLAPPED ovl;
HANDLE h;
memset (&ovl, 0, sizeof ovl);
/* Seriously WTF Windows? */
ovl.Offset = offset & 0xffffffff;
ovl.OffsetHigh = offset >> 32;
h = (HANDLE) _get_osfhandle (fd);
if (h == INVALID_HANDLE_VALUE) {
nbdkit_debug ("ReadFile: bad handle");
errno = EIO;
return -1;
}
/* XXX Will fail weirdly if count is larger than 32 bits. */
if (!WriteFile (h, buf, count, &r, &ovl)) {
nbdkit_debug ("WriteFile: error %d", GetLastError ());
errno = EIO;
return -1;
}
return r;
}
#else /* !WIN32 */
#error "no replacement pwrite is available on this platform"
#endif
#endif /* !HAVE_PWRITE */
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