On Mon, Apr 7, 2008 at 6:16 PM, Justin Pryzby
<justinpryzby@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Version: 2.79-2
> File: /usr/share/man/man2/wait.2.gz
>
> What do people think of something like the attached change? While
> working with Debian's cron package, I found that explicitly setting
> the SIGCHLD action to SIG_IGN inhibits the creation of zombie
> processes, even though kill(1) gives the "ignore" as the default
> disposition.
>
> Consider the attached example program. Any of the following changes
> will cause a zombie process to be visible in a ps -ef process listing:
>
> . remove the call to signal();
> . change SIG_IGN to SIG_DFL;
> . remove the sleep(1); (due to process scheduling, the zombie is only
> sometimes visible);
> . ???
>
> --- /usr/share/man/man2/wait.2.gz
> +++ /tmp/wait2.gz.22000 2008-04-07 12:02:31.000000000 -0400
> @@ -46,7 +46,7 @@
> .\" Much other text rewritten
> .\" 2005-05-10, mtk, __W* flags can't be used with waitid()
> .\"
> -.TH WAIT 2 2007-07-26 "Linux" "Linux Programmer's Manual"
> +.TH WAIT 2 2008-04-07 "Linux" "Linux Programmer's Manual"
> .SH NAME
> wait, waitpid, waitid \- wait for process to change state
> .SH SYNOPSIS
> @@ -429,7 +429,7 @@
>
> POSIX.1-2001 specifies that if the disposition of
> .B SIGCHLD
> -is set to
> +is set explicitly to
> .B SIG_IGN
> or the
> .B SA_NOCLDWAIT
I would not favor this. It suggests that there is the notion of
"implicitly" setting the disposition to SIG_IGN, which of course there
isn't. What I've instead done is added a sentence:
Note that even though
--
Michael Kerrisk
Maintainer of the Linux man-pages project
http://www.kernel.org/doc/man-pages/
Want to report a man-pages bug? Look here:
http://www.kernel.org/doc/man-pages/reporting_bugs.html
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