PostgreSQL Source Code  git master
All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Pages
win32pwrite.c File Reference
#include "c.h"
#include <windows.h>
Include dependency graph for win32pwrite.c:

Go to the source code of this file.

Functions

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

Function Documentation

◆ pg_pwrite()

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

Definition at line 20 of file win32pwrite.c.

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 }
#define Min(x, y)
Definition: c.h:983
static char * buf
Definition: pg_test_fsync.c:72
static int fd(const char *x, int i)
Definition: preproc-init.c:105
static pg_noinline void Size size
Definition: slab.c:607
void _dosmaperr(unsigned long)
Definition: win32error.c:177

References _dosmaperr(), buf, fd(), Min, and size.