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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Bruce Evans <brde@optusnet.com.au>
References: <200906232316.n5NNG1iT094289@svn.freebsd.org>
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Date: Tue, 30 Jun 2009 17:04:34 +0200
In-Reply-To: <20090627033608.P35379@delplex.bde.org> (Bruce Evans's message of
	"Sat, 27 Jun 2009 04:16:03 +1000 (EST)")
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Cc: svn-src-head@FreeBSD.org, Xin LI <delphij@FreeBSD.org>,
	svn-src-all@FreeBSD.org, src-committers@FreeBSD.org, d@delphij.net
Subject: Re: svn commit: r194789 - head/usr.bin/usbhidctl
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Bruce Evans <brde@optusnet.com.au> writes:
> Actually, it is OK to use it in FreeBSD iff the system supports the
> same program having different names, like reboot/halt/etc.

I don't see the point - you would still need different usage messages
for each version.  Using your example:

% reboot -h
reboot: illegal option -- h
usage: reboot [-dlnpq] [-k kernel]
% halt -h
halt: illegal option -- h
usage: halt [-lnpq] [-k kernel]

The code that implements this is needlessly complicated:

static void
usage()
{
        (void)fprintf(stderr, "usage: %s [-%slnpq] [-k kernel]\n",
            getprogname(), dohalt ? "" : "d");
        exit(1);
}

The following is far more readable:

static void
usage(void)
{

	(void)fprintf(stderr, dohalt ?
	    "usage: halt [-lnpq] [-k kernel]\n" :
	    "usage: reboot [-dlnpq] [-k kernel]\n");
	exit(1);
}

BTW, there are numerous style issues in sbin/reboot/reboot.c.

> This was discussed in FreeBSD mailing lists years ago, and IIRC no one
> disagreed with the existing practice of hard-coding the program name.

ISTR it was one of my commits that triggered the discussion.  It must
have been ten years ago, or close to it.  Blink of an eye ;)

I just realized that we have at least one committer who wasn't born when
the FreeBSD project was founded...

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no