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/*-------------------------------------------------------------------------
*
* win32pread.c
* Implementation of pread(2) for Windows.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/port/win32pread.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#include <windows.h>
ssize_t
pg_pread(int fd, 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;
}
/* Avoid overflowing DWORD. */
size = Min(size, 1024 * 1024 * 1024);
/* Note that this changes the file position, despite not using it. */
overlapped.Offset = offset;
if (!ReadFile(handle, buf, size, &result, &overlapped))
{
if (GetLastError() == ERROR_HANDLE_EOF)
return 0;
_dosmaperr(GetLastError());
return -1;
}
return result;
}
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