Hi,It is a well known bug to be checking the errno value without first checking that the system call failed. The errno number has no meaning _unless_ the system call failed, it doesn't matter what it's value is if there hasn't been an error.
Hope that helps... Ed -- ------------------------------------------------------------------------ | Ed Griffiths, Acedb/ZMap development, Computational Genomics Group, | | The Sulston Building, Sanger Institute, Wellcome Trust Genome Campus, | | Hinxton, Cambridge CB10 1HH | | | | email: edg...@sanger.ac.uk Tel: +44-1223-496844 Fax: +44-1223-494919 | ------------------------------------------------------------------------ --The Wellcome Trust Sanger Institute is operated by Genome Research Limited, a charity registered in England with number 1021457 and a company registered in England with number 2742969, whose registered office is 215 Euston Road, London, NW1 2BE.
Hello, Am 21.01.2015 22:31, schrieb KIU Shueng Chuan: > Are you sure that the ioctl call failed? You are printing out errno wit hout > having checked the return code of the ioctl call. -Snipp- that actually was the problem!!! My own code had more debug checks to verify that none of the previous calls failed. But that debug code never checked the contents of errno before the end! zmq_bind() may return successfully (zmq_bind() == 0), but it still leaves errno non-equal to zero. And in my "real" program I didn't use the return code of the ioctl call but the errno value. Thank you for helping me find this! Now the question: is it proper behaviour of zmq_bind() to change errno to a non-success value and then return successfully? Or should ZMQ everywhere that it works around "temporary" errors reset errno to zero on success? Best regards, Olaf Mandel -- Olaf Mandel phone: +49-89-189166-250 fax: +49-89-189166-111 Menlo Systems GmbH Am Klopferspitz 19a, D-82152 Martinsried Amtsgericht München HRB 138145 Geschäftsführung: Dr Michael Mei, Dr Ronald Holzwarth USt-IdNr. DE217772017, St.-Nr. 14316170324
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