X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:subject:to:references:from:message-id:date :mime-version:in-reply-to:content-type :content-transfer-encoding; q=dns; s=default; b=A0uwlRtTQXm4g/9b S2Y32AfRSLE1PWnIqiL4jP1sUYW5yCk4XGeyFKZ60rRgpUhxo6B8gKYvOs4fs38Q 1Ms5vf/d4IoWWSqF4Js4DlnfJEodFjJMEWr9eJY9kpRmPj+Adj9hQJqqwjRNx+Qb oJKkEON0BHLYi1F3Y4w0XY+uqSI= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:subject:to:references:from:message-id:date :mime-version:in-reply-to:content-type :content-transfer-encoding; s=default; bh=03YrcFKrXP1lURo+Y3tdRX Wosao=; b=Wkstwq7WAwf69cyb+OOCq1n7N1v2tI00pd6CWz8OnRCFMqgg9h2g0N jCqbaj2OrB0ySrVN3+5dPGFpdBJwajZpnr/+4x6aOZdbmrYmaBgHZ1pc0HoEAeW9 wVCe98Cx0mp5KYMVU5sTkXdga3yKWfUgPSQ5+SbzgmPO6p1K6tiKs= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: 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 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=1.7 required=5.0 tests=AWL,BAYES_50,KAM_LAZY_DOMAIN_SECURITY autolearn=no version=3.3.2 spammy=adress, hallo, delivers, H*c:ISO-8859-1 X-HELO: m0.truegem.net Subject: Re: RPC clnt_create() adress already in use To: cygwin AT cygwin DOT com References: <59D90AF8D70E9740907BACDE2BCB52083660696D AT RESW103 DOT resdom01 DOT local> From: Mark Geisert Message-ID: Date: Wed, 27 Sep 2017 02:49:57 -0700 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 SeaMonkey/2.46 MIME-Version: 1.0 In-Reply-To: <59D90AF8D70E9740907BACDE2BCB52083660696D@RESW103.resdom01.local> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hello Raimund, Let's keep this on the mailing list please. PAULUS, Raimund, TI-ABN wrote: > Hallo Mark Geisert, > > many thanks for your answer. I supposed this too. > > I included in my source code the following function calls after clnt_create(): > > int fd = 0; > bool bool_ret = clnt_control(cl, CLGET_FD, &fd); if(bool_ret == true) { > printf("fd: %d\n", fd); > > int enable = 1; > retval = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)); > if(retval < 0) > fprintf(stderr, "Fehler setsockopt(): %s\n", strerror(errno)); } > > The function clnt_control() delivers the socket of the RPC-Client-Handle. > The result is the same as before. Moreover i think, the effect of setsockopt() would be valid only during the process is running (my test scenarios 1 and 2). > But it wouldn't change anything regarding my test scenario 3 (several restarts). > > Raimund I looked through the libtirpc source code and nowhere is SO_REUSEADDR being set. You are on the right track with how to do it, but by the time clnt_create() returns to you it is already too late. As far as I can tell there is no way to get access to the socket between the time it's created within libtirpc and the time it's made available to you by clnt_create(). I did try running your testcase (thanks for supplying that) but I don't have a local machine running RPC services and don't wish to poke at random machines on the Internet ;-). I had to compile it as so: gcc -g -o test_rpc -I/usr/include/tirpc test_rpc.c -ltirpc You are taking care to compile against the correct RPC-package includes and link against the correct RPC-package libraries, yes? Speculation: There might be a way to decompose what clnt_create() does into other libtirpc functions that accomplish the same thing, but in smaller pieces such that you could set the socket option before bind() is called. That would be a fair amount of work though and given my cursory look at the source I don't know if it's even possible. ..mark -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple