Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com From: "Peter Stephens" To: "'Peter A. Castro'" Cc: Subject: RE: recv and errno during a connection reset/closed by peer Date: Mon, 28 Mar 2005 23:55:33 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_0000_01C533F1.A20022E0" In-Reply-To: ------=_NextPart_000_0000_01C533F1.A20022E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Pete, The most likely reason for the difference in Cygwin is, "If you create a socket using the Winsock 2 WSASocket API and you need to apply a timeout in receive or send operations on the socket, you must specify the WSA_FLAG_OVERLAPPED flag in the WSASocket call." From the MSDN website article http://support.microsoft.com/default.aspx?scid=kb;en-us;181610. Peter A. Stephens ptfoof AT sbcglobal DOT net -----Original Message----- From: Peter A. Castro [mailto:doctor AT fruitbat DOT org] Sent: Monday, March 28, 2005 7:02 PM To: Peter Stephens Cc: cygwin AT cygwin DOT com Subject: RE: recv and errno during a connection reset/closed by peer On Mon, 28 Mar 2005, Peter Stephens wrote: > Brian > > Are you saying that there is no way to distinguish a dropped > connection from a MSG_PEEK with no data to retrieve? As someone who's seen this behaviour on several platforms, it can happen. I've had to deal with this little annoyance in other products by having a retry counter loop. So many consecutive recv()s of 0 length constitues a closed connection. Something like this might work here as well? > Pete > > P.S. I use this standard: http://www.unix.org/unix03.html . Is this > incorrect? Brians' link is to the Single Unix Spec V2, so it's not all that old. > Peter A. Stephens > ptfoof AT sbcglobal DOT net > > -----Original Message----- > From: Brian Ford [mailto:ford AT vss DOT fsi DOT com] > Sent: Monday, March 28, 2005 11:37 AM > To: Peter Stephens > Cc: cygwin AT cygwin DOT com > Subject: RE: recv and errno during a connection reset/closed by peer > > On Fri, 25 Mar 2005, Peter Stephens wrote: > >> I boiled this down to nothing(see below). I must be missing >> something basic. > > Yup. > >> I tried the suggestions made so far and it never gets to: >> >> printf(" >>> ERRNO %i\n", errno); >> >> I would expect that on a disconnect (I use putty in telnet or raw >> mode) it would return -1 whether it is doing MSG_PEEK or an actual >> retrieval. No luck. > > Nope (http://www.opengroup.org/onlinepubs/7990989775/xns/recv.html): > > "If no messages are available to be received and the peer has > performed an orderly shutdown, recv() returns 0." > > I think that's what you're missing. > > -- > Brian Ford > Senior Realtime Software Engineer > VITAL - Visual Simulation Systems > FlightSafety International > the best safety device in any aircraft is a well-trained pilot... > > > -- > 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/ > -- Peter A. Castro or "Cats are just autistic Dogs" -- Dr. Tony Attwood ------=_NextPart_000_0000_01C533F1.A20022E0 Content-Type: text/x-vcard; name="Peter Stephens.vcf" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="Peter Stephens.vcf" BEGIN:VCARD VERSION:2.1 N:Stephens;Peter FN:Peter Stephens ORG:Home TITLE:Engineer TEL;WORK;VOICE:(765) 451-7074 TEL;HOME;VOICE:(765) 452-5757 ADR;WORK:;;712 West Sycamore;;;46901 LABEL;WORK;ENCODING=3DQUOTED-PRINTABLE:712 West Sycamore=3D0D=3D0A46901 ADR;HOME:;;712 West Sycamore;Kokomo;Indiana;46901;United States of America LABEL;HOME;ENCODING=3DQUOTED-PRINTABLE:712 West Sycamore=3D0D=3D0AKokomo, I= ndiana 46901=3D0D=3D0AUnited States of America KEY;X509;ENCODING=3DBASE64: MIICUTCCAbqgAwIBAgIDDY5MMA0GCSqGSIb3DQEBBAUAMGIxCzAJBgNVBAYTAlpBMSUwIwYD VQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVy c29uYWwgRnJlZW1haWwgSXNzdWluZyBDQTAeFw0wNDEyMDUwMDA5MTBaFw0wNTEyMDUwMDA5 MTBaMEYxHzAdBgNVBAMTFlRoYXd0ZSBGcmVlbWFpbCBNZW1iZXIxIzAhBgkqhkiG9w0BCQEW FHB0Zm9vZkBzYmNnbG9iYWwubmV0MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDf2LTd qZziVqegERBKR+v4/4gtWglb6etefelI8Tffp6S1wEMp1gf2jxiJaFI9ftbDWXJalcHfrI2i 7YPp6WoYR2tBjRK6mBNP/t2J0YN18g5QSZQv946WpU+JDLPYzC7Ect17sNHNaw4yYWSDoTMn 0u2g4IWi4M5wYEPT3iKVjwIDAQABozEwLzAfBgNVHREEGDAWgRRwdGZvb2ZAc2JjZ2xvYmFs Lm5ldDAMBgNVHRMBAf8EAjAAMA0GCSqGSIb3DQEBBAUAA4GBAAQa2uZI/EzMOZL5+SKm8UGd 32o+AQKEoFv1CGKOeKEum1cUgTExIGWdy3uKzoS32/S+1TiGPxDd0Eis/BoYxfyHWP7eFmJA M3fV1o5RSLKUEBx8NjFqXZPXIsU9rBawh4jAyBD5Z6aJhdNPhljk+dV2IEyFmziHJ2AzI/bK qVEk EMAIL;PREF;INTERNET:ptfoof AT sbcglobal DOT net REV:20041211T220759Z END:VCARD ------=_NextPart_000_0000_01C533F1.A20022E0 Content-Type: text/plain; charset=us-ascii -- 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/ ------=_NextPart_000_0000_01C533F1.A20022E0--