From owner-freebsd-dtrace@FreeBSD.ORG Tue Dec 10 23:47:16 2013 Return-Path: Delivered-To: freebsd-dtrace@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 47C7142F for ; Tue, 10 Dec 2013 23:47:16 +0000 (UTC) Received: from albert.catwhisker.org (mx.catwhisker.org [198.144.209.73]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id E64C81C86 for ; Tue, 10 Dec 2013 23:47:15 +0000 (UTC) Received: from albert.catwhisker.org (localhost [127.0.0.1]) by albert.catwhisker.org (8.14.7/8.14.7) with ESMTP id rBANlEVo019347; Tue, 10 Dec 2013 15:47:14 -0800 (PST) (envelope-from david@albert.catwhisker.org) Received: (from david@localhost) by albert.catwhisker.org (8.14.7/8.14.7/Submit) id rBANlE77019346; Tue, 10 Dec 2013 15:47:14 -0800 (PST) (envelope-from david) Date: Tue, 10 Dec 2013 15:47:14 -0800 From: David Wolfskill To: hiren panchasara Subject: Re: Examples from www.dtracebook.com Message-ID: <20131210234714.GQ1681@albert.catwhisker.org> References: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="gblAvmLjk8yGG9If" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Cc: freebsd-dtrace@freebsd.org X-BeenThere: freebsd-dtrace@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "A discussion list for developers working on DTrace in FreeBSD." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Dec 2013 23:47:16 -0000 --gblAvmLjk8yGG9If Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Dec 10, 2013 at 03:43:16PM -0800, hiren panchasara wrote: > http://www.dtracebook.com/index.php/Introduction_to_DTrace:read-syscall.d >=20 > $ sudo dtrace -n 'syscall::read:entry /execname !=3D "dtrace"/ { > @reads[execname, fds[arg0].fi_pathname] =3D count(); }' > dtrace: invalid probe specifier syscall::read:entry /execname !=3D > "dtrace"/ { @reads[execname, fds[arg0].fi_pathname] =3D count(); }: in > action list: fds has not yet been declared or assigned >=20 > This is on FreeBSD -head. >=20 >=20 > $ sudo dtrace -l | grep " read entry" > 49341 syscall freebsd32 read entry > 50413 syscall freebsd read entry >=20 > What am I missing? What does "invalid probe specifier " mean here? > .... Exactly what the message says: "fds has not yet been declared or assigned". We don't presently have the fds array -- see p. 131 of the book. Peace, david --=20 David H. Wolfskill david@catwhisker.org Taliban: Evil cowards with guns afraid of truth from a 14-year old girl. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --gblAvmLjk8yGG9If Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQJ8BAEBCgBmBQJSp6gBXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ4RThEMDY4QTIxMjc1MDZFRDIzODYzRTc4 QTY3RjlDOERFRjQxOTNCAAoJEIpn+cje9Bk7CgAP/3Mldbj1RNv2bvG4kttnmK2k +jOt/NO9UG4S/wlQHX+VmkXXwv7DG9cT1WGO/kKwN+klnLXrtVAubWc+fpCbmHJ3 vc53gud5soEyhSIeFNnlmdhrnERyytVPC29hnCDcLaiOr7oVzbQYfNqJn4rbBJL8 6S6iEgzDMsFcuaS+v20ga4h/cenA/6NUyb97s9lWowdlmU2E+JS5v4i370NLrp43 scBFmCJjrWCklo9SvXTjtMSL/+Rsnhx1ZySXVuBXG8D48wXtic899F+GSPamJ53n FeyRwbCU/P/siJ08U2u9lCzTH4XN3f0Ys4StrFhEBhbKFpana/9CG4DA1CT/Mkw7 hoYTa/scJ+9ab4HhYHPuW9+3kgNcAnPsZO42gMqrNaT6rIMmvrD+HZ6mWQYVzWcl OVsWdN5IQv1kdF1w4mxD8CO0LoSZUnR+A/GPd5OS8a+W+bRuoHvT+IhZGSiA2R4+ TA030LwkAeK/R/cpemF09ZOAu43P5oCK5qOqlbEBTg96GgzjhuH4hfIHhwpWAYTj TxjKf4nkJqkbfELhw87ix0mOUyj/4cE0YuH3NrzF0/utAb+AW0Cey3w+RDGcpecS pzHc1jSMuu+tc3DoRVw8HMoyuPnp6QTEeiZY/vHLkutn/xoLp+GWsDx43fZ6Pp+x y+bKn8KZqmq21XaI+3m4 =lmaP -----END PGP SIGNATURE----- --gblAvmLjk8yGG9If--