# System Parameters

'WP' | Wait for Pipe on Close

## Description

(UNIX/Linux Only)

Determines whether or not to wait until a child process completes. When the 'WP' parameter is On and a pipe is closed, PxPlus will wait until the child process has terminated.

#### Note:
If the 'WP' parameter is On and the operation that the child was started for does not complete, then PxPlus will not return. A Ctrl-Break may terminate the child, depending on the child's processing of a BREAK.

When the 'WP' parameter is Off and a pipe is closed, PxPlus will not wait for the child to complete. This can result in a child process that has not had its exit status checked (shown as "defunct"). PxPlus will automatically check and clear out these defunct processes whenever a) it opens another pipe, b) a WAIT directive is encountered, or c) the current PxPlus session is terminated.

## Default

Off

## See Also

WAIT Temporarily Halt Execution