Messages in this thread | | | Date | Tue, 20 Sep 2005 16:25:08 +0200 | From | Peter Duellings <> | Subject | kernel error in system call accept() under kernel 2.6.8 |
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---------------------------------------------------------------------- One line summary of the problem: linux accept() system call does not set always errno if the returnvalue is negative.
---------------------------------------------------------------------- Full description of the problem/report: Obviously there are some cases where the accept() system call does not set the errno variable if the accept() system call returns with a value less than zero:
Distribution : Linux Fedora Core 2 - but with kernel 2.6.8 Sample code: --snip---------- .... //accept may return with a protocol error, simply try again while( (n = accept(m_ListenFd, (struct sockaddr *) cliaddr, &len)) < 0) { Log.Log("Error accept, fd=%d, addrlen=%d, len=%d, errno=%d, %s", m_ListenFd, m_AddrLen, len, errno, strerror_r(errno, l_strebuf, sizeof(l_strebuf))); if (errno == EPROTO || errno == ECONNABORTED) //connection already aborted { Log.Log("connection aborted, wait for next"); continue; //next try } else if (errno == EINTR) { //signal if (CnThread::TestCancel(m_Log)) { Log.Log("thread is cancelled"); delete[] cliaddr; return -1; } else { Log.Log("EINTR, try again"); continue; //next try } } else { throw CnException(__FILE__, __LINE__, "accept error errno=%d, %s", errno, strerror_r(errno, l_strebuf, sizeof(l_strebuf))); } } ... --snip----- output: CnTcpServer::WaitClient Error accept, fd=19, addrlen=16, len=16, errno=0, Success
---------------------------------------------------------------------- Keywords (i.e., modules, networking, kernel): network accept errno error return value ---------------------------------------------------------------------- Kernel version (from /proc/version): cat /proc/version Linux version 2.6.8-1.521 (root@wsa92_D2_FEDTest) (gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7)) #3 Fri Jul 8 11:08:56 CEST 2005 ---------------------------------------------------------------------- ---------------------------------------------------------------------- Question: Is there any update/information/explanation about this behaviour available??
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