Date: Tue, 22 Jan 2002 23:52:35 -0800 (PST) From: Ali Imran <ai32@drexel.edu> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/34195: setting the action for SIGCHLD to SIG_IGN will create zombies Message-ID: <200201230752.g0N7qZ374824@freefall.freebsd.org>
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>Number: 34195
>Category: misc
>Synopsis: setting the action for SIGCHLD to SIG_IGN will create zombies
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jan 23 00:00:02 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Ali Imran
>Release: 4.4-STABLE
>Organization:
>Environment:
FreeBSD XXX 4.5-PRERELEASE FreeBSD 4.5-PRERELEASE #1: Wed Dec 26 19:38:52 EST 2001 root@XXX:/usr/src/sys/compile/REDDOG i386
>Description:
Single UNIX Specification Version 2 states that:
..
If the action for the SIGCHLD signal is set
to SIG_IGN, child processes of the calling
processes will not be transformed into zombie
processes when they terminate. If the calling
..
However FreeBSD creates zombies.
I don't know if this is "traditional" BSD
beahvior and considered a "feature" and not
a bug.
>How-To-Repeat:
1. Create a sample program that
a. sets action for SIGCHLD to SIG_IGN (signal(SIGCHLD, SIG_IGN))
b. fork()'s repeatedly
c. have the children exit()
2. Sit and watch PS as zombies are created
I would submit a sample program but the "Note" says not to.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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