streampipes.5 (2010 09)

streampipes(5) streampipes(5)

(Tunable Kernel Parameters)

NAME

streampipes - force all pipes to be STREAMS-based

VALUES

Failsafe

Default

Allowed values

0 - 2147483647

Recommended values

DESCRIPTION

This tunable determines the type of pipe that is created by the

pipe() system call. If set to the default

value of zero, all pipes created by

pipe()

are normal HP-UX ﬁle-system pipes. If the value is non-zero,

pipe() creates STREAMS-based pipes, and STREAMS modules can be pushed onto the resulting

stream.

If this tunable is set to a non-zero value, the

pipemod and pipedev module and driver must be

conﬁgured in ﬁle /stand/system

Who Is Expected to Change This Tunable?

Any customer.

Restrictions on Changing

Changes to this tunable take effect at next reboot.

When Should the Tunable Be Turned On?

If the customer uses applications that require STREAMS-based pipes, this tunable should be turned on.

What Are the Side Effects of Turning the Tunable On?

STREAMS-based pipes performance may differ from normal ﬁle system pipes.

When Should the Tunable Be Turned Off?

If the customer does not need the STREAMS-based pipes, this tunable should be turned off.

What Are the Side Effects of Turning the Tunable Off?

Applications that try to push STREAMS modules onto the pipe will fail.

What Other Tunable Should Be Changed at the Same Time as This One?

If this tunable is set to a non-zero value, the

pipemod and pipedev module and driver must be

conﬁgured in the ﬁle /stand/system.

WARNINGS

All HP-UX kernel tunable parameters are release speciﬁc. This parameter may be removed or have its

meaning changed in future releases of HP-UX.

Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parame-

ter values. After installation, some tunable parameters may no longer be at the default or recommended

values. For information about the effects of installation on tunable values, consult the documentation for

the kernel software being installed. For information about optional kernel software that was factory

installed on your system, see HP-UX Release Notes at http://www.hp.com/go/hpux-core-docs.

AUTHOR

streampipes was developed by HP.