postgresql/src/port/win32pwrite.c

42 lines
798 B
C

/*-------------------------------------------------------------------------
*
* win32pwrite.c
* Implementation of pwrite(2) for Windows.
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/port/win32pwrite.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <windows.h>
ssize_t
pwrite(int fd, const void *buf, size_t size, off_t offset)
{
OVERLAPPED overlapped = {0};
HANDLE handle;
DWORD result;
handle = (HANDLE) _get_osfhandle(fd);
if (handle == INVALID_HANDLE_VALUE)
{
errno = EBADF;
return -1;
}
overlapped.Offset = offset;
if (!WriteFile(handle, buf, size, &result, &overlapped))
{
_dosmaperr(GetLastError());
return -1;
}
return result;
}