Date: Wed, 25 Nov 2015 19:54:18 -0500 From: "George Neville-Neil" <gnn@freebsd.org> To: "Mark Johnston" <markj@FreeBSD.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r291341 - head/share/dtrace Message-ID: <9DC14292-288A-4BD0-910B-7363AE63BA15@freebsd.org> In-Reply-To: <20151125231842.GA67865@wkstn-mjohnston.west.isilon.com> References: <201511252259.tAPMxfIq060477@repo.freebsd.org> <20151125231842.GA67865@wkstn-mjohnston.west.isilon.com>
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On 25 Nov 2015, at 18:20, Mark Johnston wrote: > On Wed, Nov 25, 2015 at 10:59:41PM +0000, George V. Neville-Neil > wrote: >> Author: gnn >> Date: Wed Nov 25 22:59:41 2015 >> New Revision: 291341 >> URL: https://svnweb.freebsd.org/changeset/base/291341 >> >> Log: >> Summary: A simple script to print the return value of any function, >> with or without wild cards. >> >> Added: >> head/share/dtrace/retval.sh (contents, props changed) >> >> Added: head/share/dtrace/retval.sh >> ============================================================================== >> --- /dev/null 00:00:00 1970 (empty, because file is newly added) >> +++ head/share/dtrace/retval.sh Wed Nov 25 22:59:41 2015 (r291341) >> @@ -0,0 +1,43 @@ >> +#!/bin/sh >> +# >> +# Copyright (c) 2015 George V. Neville-Neil <gnn@freebsd.org> >> +# All rights reserved. >> +# >> +# Redistribution and use in source and binary forms, with or without >> +# modification, are permitted provided that the following conditions >> +# are met: >> +# 1. Redistributions of source code must retain the above copyright >> +# notice, this list of conditions and the following disclaimer. >> +# 2. Redistributions in binary form must reproduce the above >> copyright >> +# notice, this list of conditions and the following disclaimer in >> the >> +# documentation and/or other materials provided with the >> distribution. >> +# >> +# THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS >> IS'' AND >> +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, >> THE >> +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR >> PURPOSE >> +# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE >> LIABLE >> +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR >> CONSEQUENTIAL >> +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE >> GOODS >> +# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS >> INTERRUPTION) >> +# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN >> CONTRACT, STRICT >> +# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN >> ANY WAY >> +# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE >> POSSIBILITY OF >> +# SUCH DAMAGE. >> +# >> +# $FreeBSD$ >> +# >> +# retval.sh - show the return value of any probe named by the user >> +# >> +# USAGE: retval.sh name >> +# >> +# The name can be a full function name or a wild card name. The >> +# caller is responsible for handling the escaping of wild cards. >> +# >> +/usr/sbin/dtrace -n ' >> + >> +#pragma D option quiet >> + >> +:::'$1':return { >> + printf("%s %d\n", probefunc, arg1); >> +} >> +' > > This can be done without a shell since D has support for command-line > arguments. The following should be equivalent: > > #!/usr/sbin/dtrace -s > > #pragma D option quiet > > fbt::$1:return > { > printf("%s %d\n", probefunc, arg1); > } Done. Although if we ever want to expand this script it'll have to move back to shell. DTrace has very poor options handling overall. Best, George
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