From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270490AbTGXFNJ (ORCPT ); Thu, 24 Jul 2003 01:13:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270492AbTGXFNJ (ORCPT ); Thu, 24 Jul 2003 01:13:09 -0400 Received: from exchfe1.cs.cornell.edu ([128.84.97.27]:559 "EHLO exchfe1.cs.cornell.edu") by vger.kernel.org with ESMTP id S270490AbTGXFNG (ORCPT ); Thu, 24 Jul 2003 01:13:06 -0400 From: Eli Barzilay MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16159.28266.868297.372200@mojave.cs.cornell.edu> Date: Thu, 24 Jul 2003 01:28:10 -0400 To: linux-kernel@vger.kernel.org Subject: Repost: Bug with select? In-Reply-To: <16112.10166.989608.288954@mojave.cs.cornell.edu> References: <16112.10166.989608.288954@mojave.cs.cornell.edu> X-Mailer: VM 7.15 under Emacs 21.1.1 X-OriginalArrivalTime: 24 Jul 2003 05:28:07.0708 (UTC) FILETIME=[5D3A15C0:01C351A4] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org [This is a second post, since I didn't get any replies the first time. It looks more like a bug now, which sounds strange for something that common...] When I run the following program, and block the terminal's output (C-s), the `select' doesn't seem to have any effect, resulting in a 100% cpu usage (this is on a RH8, with 2.4.18). I wouldn't be surprised if I'm doing something stupid, but it does seem to work fine on Solaris. Is there anything wrong with this, or is this some bug? ====================================================================== #include #include int main() { int flags, fd, len; fd_set writefds; fd = 1; flags = fcntl(fd, F_GETFL, 0); fcntl(fd, F_SETFL, flags | O_NONBLOCK); while (1) { FD_ZERO(&writefds); FD_SET(fd, &writefds); len = select(fd + 1, NULL, &writefds, NULL, NULL); if (!FD_ISSET(fd,&writefds)) exit(0); len = write(fd, "hi\n", 3); } fcntl(fd, F_SETFL, flags); } ====================================================================== -- ((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay: http://www.barzilay.org/ Maze is Life!