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win32pwrite.c

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1/*-------------------------------------------------------------------------

2 *

3 * win32pwrite.c

4 * Implementation of pwrite(2) for Windows.

5 *

7 *

8 * IDENTIFICATION

9 * src/port/win32pwrite.c

10 *

11 *-------------------------------------------------------------------------

12 */

13

14

15#include "c.h"

16

17#include <windows.h>

18

19ssize_t

20 pg_pwrite(int fd, const void *buf, size_t size, off_t offset)

21{

22 OVERLAPPED overlapped = {0};

23 HANDLE handle;

24 DWORD result;

25

26 handle = (HANDLE) _get_osfhandle(fd);

27 if (handle == INVALID_HANDLE_VALUE)

28 {

29 errno = EBADF;

30 return -1;

31 }

32

33 /* Avoid overflowing DWORD. */

34 size = Min(size, 1024 * 1024 * 1024);

35

36 /* Note that this changes the file position, despite not using it. */

37 overlapped.Offset = offset;

38 if (!WriteFile(handle, buf, size, &result, &overlapped))

39 {

40 _dosmaperr(GetLastError());

41 return -1;

42 }

43

44 return result;

45}

c.h

Min

#define Min(x, y)

Definition: c.h:1003

buf

static char * buf

Definition: pg_test_fsync.c:72

fd

static int fd(const char *x, int i)

Definition: preproc-init.c:105

_dosmaperr

void _dosmaperr(unsigned long)

Definition: win32error.c:177

pg_pwrite

ssize_t pg_pwrite(int fd, const void *buf, size_t size, off_t offset)

Definition: win32pwrite.c:20

PostgreSQL Source Code: src/port/win32pwrite.c Source File