Function pg_pwrite

src/port/pwrite.c:26–55

#endif

ssize_t
pg_pwrite(int fd, const void *buf, size_t size, off_t offset)
{
#ifdef WIN32
	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;
#else
	if (lseek(fd, offset, SEEK_SET) < 0)
		return -1;

	return write(fd, buf, size);
#endif
}