From owner-freebsd-doc@freebsd.org Thu Mar 29 22:51:20 2018 Return-Path: Delivered-To: freebsd-doc@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 74E23F50BA9 for ; Thu, 29 Mar 2018 22:51:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 0FDFB689E4 for ; Thu, 29 Mar 2018 22:51:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 42880488 for ; Thu, 29 Mar 2018 22:51:19 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w2TMpJ3q032899 for ; Thu, 29 Mar 2018 22:51:19 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w2TMpJwK032898 for freebsd-doc@FreeBSD.org; Thu, 29 Mar 2018 22:51:19 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: freebsd-doc@FreeBSD.org Subject: [Bug 159099] [ioctl] ioctl SIOCGIFCONF does not export an array of struct ifreq Date: Thu, 29 Mar 2018 22:51:19 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Documentation X-Bugzilla-Component: Documentation X-Bugzilla-Version: Latest X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: brooks@FreeBSD.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: freebsd-doc@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: component short_desc assigned_to cc product version Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-doc@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Documentation project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Mar 2018 22:51:20 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D159099 Brooks Davis changed: What |Removed |Added ---------------------------------------------------------------------------- Component|kern |Documentation Summary|[ioctl] ioctl SIOCGIFCONF |[ioctl] ioctl SIOCGIFCONF |reports interface names |does not export an array of |which are blank |struct ifreq Assignee|freebsd-bugs@FreeBSD.org |freebsd-doc@FreeBSD.org CC| |brooks@FreeBSD.org Product|Base System |Documentation Version|unspecified |Latest --- Comment #4 from Brooks Davis --- The documented behavior of SIOCGIFCONF is to write an array of struct ifreq= .=20 If all interface addresses (including link layer addresses) fit in struct sockaddr's 14 bytes of sa_data this is true. If any longer addresses exist (e.g. IPv6 addresses) then the implementation writes out the ifr_name value (16-bytes) followed by the sockaddr. The next item follows the same rule. Both the current implementation and tcpdump assume that there is no pad bet= ween ifr_name and ifr_addr. This assumption holds for all current architectures. [I believe this is a documentation bug in both the comments and the manpage= s.=20 Documentation should note the above issues and this this interface is non-portable.] --=20 You are receiving this mail because: You are the assignee for the bug.=