How to clear zombie children while parent still alive.

[Junsheng Long]

Is that possible to clear all zombie children while the parent
is still in execution under SunOS? I had the parent process to call
signal(SIGCHLD, SIG_IGN). This should let init to clear the
terminated child automaitically, when the parent got a SIGCHLD.
But SunOS still kept all the zombies until the parent exited. 
Is SunOS different from other Unix systems in this regard? 
Is it possible to clear zombies in a SunOS environment? And how?

Thank you.

Junsheng