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From: John Baldwin <jhb@freebsd.org>
To: Alexander Best <arundel@freebsd.org>
Date: Thu, 6 Jan 2011 16:18:39 -0500
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org, Konstantin Belousov <kib@freebsd.org>,
	Garrett Cooper <gcooper@freebsd.org>
Subject: Re: svn commit: r216955 - head/usr.sbin/rtprio
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On Thursday, January 06, 2011 4:10:17 pm Alexander Best wrote:
> On Thu Jan  6 11, Garrett Cooper wrote:
> > On Thu, Jan 6, 2011 at 12:41 PM, Alexander Best <arundel@freebsd.org> 
wrote:
> > 
> > ...
> > 
> > > this causes problems when pid is -0:
> > >
> > > [id|rt]prio -t -0 and [id|rt]prio 10 -0 will try to run "0" via 
execvp().
> > > beforehand however this will also trigger rtprio().
> > >
> > > a better solution would be to do:
> > >
> > >                if (argv[2][0] == '-') {
> > >                        proc = parseint(argv[2] + 1, "pid");
> > >                        if (rtprio(RTP_SET, proc, &rtp) != 0)
> > >                                err(1, "RTP_SET");
> > >                } else {
> > >                        execvp(argv[2], &argv[2]);
> > >                                err(1, "%s", argv[2]);
> > >                }
> > 
> > How did you get a pid of -0?
> 
> pid 0 stands for the current process. see rptio(2).

Note that that usage is rather pointless since it means you apply rtprio to 
the 'rtprio' process that is about to exit. :)

-- 
John Baldwin