From owner-freebsd-bugs@FreeBSD.ORG Wed Jan 12 14:40:24 2005 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8349B16A4CF for ; Wed, 12 Jan 2005 14:40:24 +0000 (GMT) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5204A43D4C for ; Wed, 12 Jan 2005 14:40:24 +0000 (GMT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.1/8.13.1) with ESMTP id j0CEeO2E053063 for ; Wed, 12 Jan 2005 14:40:24 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.13.1/8.13.1/Submit) id j0CEeOSS053060; Wed, 12 Jan 2005 14:40:24 GMT (envelope-from gnats) Resent-Date: Wed, 12 Jan 2005 14:40:24 GMT Resent-Message-Id: <200501121440.j0CEeOSS053060@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Drazen Kacar Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7CC3616A4D9 for ; Wed, 12 Jan 2005 14:34:14 +0000 (GMT) Received: from kyle.globalnet.hr (kyle.globalnet.hr [213.149.32.24]) by mx1.FreeBSD.org (Postfix) with ESMTP id 413B043D45 for ; Wed, 12 Jan 2005 14:34:13 +0000 (GMT) (envelope-from dave@globalnet.hr) Received: from mail.globalnet.hr (cartman.globalnet.hr [213.149.32.10]) j0CEY9S1005542 for ; Wed, 12 Jan 2005 15:34:11 +0100 Received: (qmail 28867 invoked from network); 12 Jan 2005 14:34:08 -0000 Received: from r1.globalnet.hr (HELO vertigo.globalnet.hr) ([213.149.32.1]) (envelope-sender ) by 0 (qmail-ldap-1.03) with SMTP for ; 12 Jan 2005 14:34:08 -0000 Received: from vertigo.globalnet.hr (localhost [127.0.0.1]) by vertigo.globalnet.hr (8.13.1/8.13.1) with ESMTP id j0CEZtUB089565 for ; Wed, 12 Jan 2005 15:35:55 +0100 (CET) (envelope-from dave@globalnet.hr) Received: (from dave@localhost) by vertigo.globalnet.hr (8.13.1/8.13.1/Submit) id j0CEZtH3089564 for FreeBSD-gnats-submit@freebsd.org; Wed, 12 Jan 2005 15:35:55 +0100 (CET) (envelope-from dave@globalnet.hr) Message-Id: <20050112143555.GA89550@vertigo.globalnet.hr> Date: Wed, 12 Jan 2005 15:35:55 +0100 From: Drazen Kacar To: FreeBSD-gnats-submit@FreeBSD.org X-Send-Pr-Version: 3.113 Subject: kern/76144: poll doesn't set POLLHUP when FIFO is closed X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: Drazen Kacar List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Jan 2005 14:40:24 -0000 >Number: 76144 >Category: kern >Synopsis: poll doesn't set POLLHUP when FIFO is closed >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Jan 12 14:40:23 GMT 2005 >Closed-Date: >Last-Modified: >Originator: Drazen Kacar >Release: FreeBSD 5.3-RELEASE-p2 i386 >Organization: Cardak ni na nebu, ni na zemlji >Environment: Observed with FreeBSD 5.2.1 and 5.3 kernels on i386. >Description: When the other end of a FIFO closes file descriptor, poll(2) doesn't return with POLLHUP set in revents. Instead it keeps waiting. >How-To-Repeat: The attached program demonstrates the problem. Compile the program and run it. It another terminal (in the same directory) type: echo foo >fifo The program should output: poll() returned 1 revents = 17 read() returned 4 and exit. (It does this on Linux and Solaris). Instead, on FreeBSD, the output is: poll() returned 1 revents = 1 read() returned 4 and the program doesn't exit. >Fix: Unknown. --- fifo_poll.c begins here --- #include #include #include #include #include #include #include #include int main() { int ret; struct pollfd p[1]; char buf[256]; if (mkfifo("fifo", 0600)) { perror("mkfifo"); exit(1); } p[0].fd = open("fifo", O_RDONLY | O_NONBLOCK); if (p[0].fd < 0) { perror("open"); exit(1); } /* fcntl(p[0].fd, F_SETFL, 0); /* No change with this line. */ p[0].events = POLLIN; do { ret = poll(p, 1, -1); printf("poll() returned %d\n", ret); printf("revents = %d\n", (int)(p[0].revents)); if (p[0].revents & POLLIN) { ret = read(p[0].fd, buf, sizeof buf); printf("read() returned %d\n", ret); } } while (!(p[0].revents & (POLLERR | POLLHUP | POLLNVAL))); return 0; } --- fifo_poll.c ends here --- >Release-Note: >Audit-Trail: >Unformatted: