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ntdll: Determine the async read avail_mode flag from the client side.

This commit is contained in:
Alexandre Julliard 2007-04-10 17:27:50 +02:00
parent 6dcb280bc5
commit 64ba011dba
1 changed files with 39 additions and 2 deletions
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41
dlls/ntdll/file.c
View File

@ -465,6 +465,40 @@ static inline int get_next_io_timeout( struct io_timeouts *timeouts, ULONG alrea
}
/* retrieve the avail_mode flag for async reads */
static NTSTATUS get_io_avail_mode( HANDLE handle, enum server_fd_type type, BOOL *avail_mode )
{
NTSTATUS status = STATUS_SUCCESS;
switch(type)
{
case FD_TYPE_SERIAL:
{
/* GetCommTimeouts */
SERIAL_TIMEOUTS st;
IO_STATUS_BLOCK io;
status = NtDeviceIoControlFile( handle, NULL, NULL, NULL, &io,
IOCTL_SERIAL_GET_TIMEOUTS, NULL, 0, &st, sizeof(st) );
if (status) break;
*avail_mode = (!st.ReadTotalTimeoutMultiplier &&
!st.ReadTotalTimeoutConstant &&
st.ReadIntervalTimeout == MAXDWORD);
}
break;
case FD_TYPE_MAILSLOT:
case FD_TYPE_SOCKET:
case FD_TYPE_PIPE:
*avail_mode = TRUE;
break;
default:
*avail_mode = FALSE;
break;
}
return status;
}
/******************************************************************************
* NtReadFile [NTDLL.@]
* ZwReadFile [NTDLL.@]
@ -553,8 +587,11 @@ NTSTATUS WINAPI NtReadFile(HANDLE hFile, HANDLE hEvent,
if (flags & FD_FLAG_OVERLAPPED)
{
async_fileio_read *fileio;
BOOL avail_mode;
if (total && (flags & FD_FLAG_AVAILABLE))
if ((status = get_io_avail_mode( hFile, type, &avail_mode )))
goto done;
if (total && avail_mode)
{
status = STATUS_SUCCESS;
goto done;
@ -569,7 +606,7 @@ NTSTATUS WINAPI NtReadFile(HANDLE hFile, HANDLE hEvent,
fileio->already = total;
fileio->count = length;
fileio->buffer = buffer;
fileio->avail_mode = (flags & FD_FLAG_AVAILABLE);
fileio->avail_mode = avail_mode;
SERVER_START_REQ( register_async )
{