Path: utzoo!mnetor!uunet!husc6!hao!ames!sdcsvax!ucsdhub!hp-sdd!hplabs!hpcea!hpfcdc!rml
From: rml@hpfcdc.HP.COM (Bob Lenk)
Newsgroups: comp.unix.questions
Subject: Re: wait3 emulation in SYSTEMV ??
Message-ID: <5740017@hpfcdc.HP.COM>
Date: 26 Jan 88 23:59:43 GMT
References: <360@rruxa.UUCP>
Organization: HP Ft. Collins, Co.
Lines: 14

> The newer versions of System V provide the possibilty to check
> the existence of a process by sending a signal 0 to the process
> in question and checking for an error return. This would allow
> you to write a write a pseudo wait3() function for terminated
> processes:

All versions of System V (and System III) permit the use of signal 0.
However, at least through V.2.* (and I haven't checked V.3.* but
wouldn't expect a change) kill() permits killing a zombie.  This is
different from BSD, where kill() returns ESRCH on attempts to kill a
zombie.

		Bob Lenk
		{ihnp4, hplabs}!hpfcla!rml