X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-1.2 required=5.0 tests=AWL,BAYES_00,J_CHICKENPOX_54,J_CHICKENPOX_66,RCVD_IN_NJABL_PROXY,SPF_PASS X-Spam-Check-By: sourceware.org Date: Thu, 18 Jun 2009 09:57:30 +0200 To: =?utf-8?Q?Fr=C3=A9d=C3=A9ric_Bron?= , cygwin Subject: Re: ioctl(sock, SIOCGIFHWADDR, &ifr) fails with 1.7 From: "Matthias Andree" Content-Type: text/plain; format=flowed; delsp=yes; charset=utf-8 MIME-Version: 1.0 References: <20090612142631.GA14587@calimero.vinschen.de> Content-Transfer-Encoding: 8bit Message-ID: In-Reply-To: User-Agent: Opera Mail/9.64 (Linux) X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Am 15.06.2009, 11:22 Uhr, schrieb Frédéric Bron : >> To fix your application, call either >> >>  struct ifconf ifc; >>  ifc.ifc_len = sizeof (struct ifreq) * 32; >>  ifc.ifc_buf = malloc (ifc.ifc_len); >>  if (ioctl (fd, SIOCGIFCONF, &ifc)) >>    /* Resize ifc_buf and retry */ >>  else >>    { >>      struct ifreq *ifr = ifc.ifc_req; >>      struct ifreq ifr2; >>      for (int i = 0; i < ifc.ifc_len; i += sizeof (struct ifreq), ++ifr) >>        if (!ioctl (fd, SIOCGIFADDR, &ifr2)) >>          /* Print result for that interface */ >>    } > > Thanks, this works half! No need of ifr2, ifr is enough. > I saw the name change: 1.5 gives eth0, eth1, eth2, lo and 1.7 gives > {821C54BE-...}... Careful - this isn't portable to newer BSDs, as there ifc_len may exceed sizeof(struct ifreq). getifaddrs() is probably the more portable solution here. -- Matthias Andree -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/