From owner-freebsd-current@FreeBSD.ORG Tue Aug 31 17:24:01 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3479B16A4CF for ; Tue, 31 Aug 2004 17:24:01 +0000 (GMT) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id DBEF543D64 for ; Tue, 31 Aug 2004 17:24:00 +0000 (GMT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.12.11/8.12.11) id i7VHNtAB073920; Tue, 31 Aug 2004 12:23:55 -0500 (CDT) (envelope-from dan) Date: Tue, 31 Aug 2004 12:23:55 -0500 From: Dan Nelson To: Gary Jennejohn Message-ID: <20040831172354.GF33896@dan.emsphone.com> References: <20040831151437.GE33896@dan.emsphone.com> <200408311705.i7VH5R2A073646@peedub.jennejohn.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200408311705.i7VH5R2A073646@peedub.jennejohn.org> X-OS: FreeBSD 5.3-BETA2 X-message-flag: Outlook Error User-Agent: Mutt/1.5.6i cc: Vladimir Grebenschikov cc: "current@freebsd.org" Subject: Re: sysutils/strace wilderness on 6-CURRENT X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 31 Aug 2004 17:24:01 -0000 In the last episode (Aug 31), Gary Jennejohn said: > Dan Nelson writes: > > In the last episode (Aug 31), Vladimir Grebenschikov said: > > > It silmple does nothing - sleeps foreaver in suspended: > > > > > > # strace /bin/ls > > > > This has happened on 5.x for ages. The quick fix is to ^Z, then > > fg, or kill -CONT the hung strace process from another vty. I > > don't know what strace does different from truss that makes it > > hang. Nowadays, truss does almost as good a job as strace, so I > > don't use it as often as I used to. The only thing I miss is > > strace's ability to print the name of blocking syscalls (read or > > sleep for example) as it waits. > > > > I fixed a bug like this in strace for Linux. The SIGCHLD handler was > being set too late and the child (through some wacky handling of > SIGCHLD in the Linux kernel) got into a state where it never returned > the expected status in wait(). Both the child and strace ended up > hanging. kill -CONT also got things going there. Maybe FreeBSD has a > similar problem? Dunno. Strace is a port built from the sources at sourceforge, so I assume that any Linux fixes would also be included. I see the port is at 4.5.1 but sourceforge is up to 4.5.7. Maybe a newer version works better? -- Dan Nelson dnelson@allantgroup.com