FILE_PIPE_INFORMATION structure (ntifs.h)

The FILE_PIPE_INFORMATION structure contains information about a named pipe that is not specific to the local or the remote end of the pipe.

Syntax

typedef struct _FILE_PIPE_INFORMATION {
  ULONG ReadMode;
  ULONG CompletionMode;
} FILE_PIPE_INFORMATION, *PFILE_PIPE_INFORMATION;

Members

ReadMode

One of the following values.

Value	Meaning
FILE_PIPE_BYTE_STREAM_MODE (0x00000000)	Data is read from the pipe as a stream of bytes.
FILE_PIPE_MESSAGE_MODE (0x00000001)	Data is read from the pipe as a stream of messages.

CompletionMode

One of the following values.

Value	Meaning
FILE_PIPE_QUEUE_OPERATION (0x00000000)	Blocking mode
FILE_PIPE_COMPLETE_OPERATION (0x00000001)	Non-blocking mode

Remarks

If ReadMode is set to FILE_PIPE_BYTE_STREAM_MODE, any attempt to change it must fail with a STATUS_INVALID_PARAMETER error code.

When CompletionMode is set to FILE_PIPE_QUEUE_OPERATION, if the pipe is connected to, read to, or written from, the operation is not completed until there is data to read, all data is written, or a client is connected.

Note  A value of FILE_PIPE_QUEUE_OPERATION for CompletionMode can result in waiting indefinitely for a client process to perform an action.

 

When CompletionMode is set to FILE_PIPE_COMPLETE_OPERATION, if the pipe is being connected to, read to, or written from, the operation is completed immediately.

For information about pipes, see Pipes.

Requirements

Requirement	Value
Minimum supported client	Windows 2000
Header	ntifs.h (include FltKernel.h, Ntifs.h)