PostgreSQL Source Code  git master
win32pwrite.c
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1 /*-------------------------------------------------------------------------
2  *
3  * win32pwrite.c
4  * Implementation of pwrite(2) for Windows.
5  *
6  * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
7  *
8  * IDENTIFICATION
9  * src/port/win32pwrite.c
10  *
11  *-------------------------------------------------------------------------
12  */
13 
14 
15 #include "c.h"
16 
17 #include <windows.h>
18 
19 ssize_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  /* Note that this changes the file position, despite not using it. */
34  overlapped.Offset = offset;
35  if (!WriteFile(handle, buf, size, &result, &overlapped))
36  {
37  _dosmaperr(GetLastError());
38  return -1;
39  }
40 
41  return result;
42 }
static char * buf
Definition: pg_test_fsync.c:73
static int fd(const char *x, int i)
Definition: preproc-init.c:105
void _dosmaperr(unsigned long)
Definition: win32error.c:177
ssize_t pg_pwrite(int fd, const void *buf, size_t size, off_t offset)
Definition: win32pwrite.c:20