openmode (ULONG) - input

A set of flags defining the mode in which to open the pipe.

This parameter contains the following bit fields:

Bit

Description
31-16
Reserved.
15
Reserved and must be 0.
14
Write-through bit. Possible values are shown in the following list:
• NP_WRITEBEHIND (0x0000)
  Write-behind to remote pipes is allowed.

• NP_NOWRITEBEHIND (0x4000)
  Write-behind to remote pipes is not allowed.

  This bit is meaningful only for a remote pipe. Occasionally, data written to a remote pipe is buffered locally and then sent across the network to the pipe at a later time. Setting the write-through bit ensures that data is sent to the remote pipe as soon as it is written.

13-8
Reserved.
7
Inheritance flag. Possible values are shown in the following list:
• NP_INHERIT (0x0000)
  The pipe handle is inherited by a child process.

• NP_NOINHERIT (0x0080)
  The pipe handle is private to the current process and cannot be inherited.

  This bit is not inherited by child processes.

6-3
Reserved and must be 0.
2-0
Access mode. The pipe access is defined as shown in the following list:

000

NP_ACCESS_INBOUND (0x0000)
Inbound pipe (client to server).
001
NP_ACCESS_OUTBOUND (0x0001)
Outbound pipe (server to client).
010
NP_ACCESS_DUPLEX (0x0002)
Duplex pipe (server to and from client).
Any other value is invalid.

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