Date: Tue, 31 Aug 2004 12:23:55 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Gary Jennejohn <garyj@www.jennejohn.org> Cc: "current@freebsd.org" <current@FreeBSD.org> Subject: Re: sysutils/strace wilderness on 6-CURRENT Message-ID: <20040831172354.GF33896@dan.emsphone.com> In-Reply-To: <200408311705.i7VH5R2A073646@peedub.jennejohn.org> References: <20040831151437.GE33896@dan.emsphone.com> <200408311705.i7VH5R2A073646@peedub.jennejohn.org>
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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
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