Date: Fri, 09 Apr 2004 07:25:35 -0500 From: Kirk Strauser <kirk@strauser.com> To: freebsd-questions@freebsd.org Subject: Why the 30-second pause after executing this script? Message-ID: <87wu4pnxs0.fsf@strauser.com> Resent-Message-ID: <200404100057.i3A0voo9010484@kanga.honeypot.net>
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One of my programs (plug: JailAdmin! Stays crunchy in milk!) uses 'jexec'
to attach to a jail to execute /etc/rc.shutdown. I've noticed that this
works as expected, unless its output is being piped into another program, in
which case 'sh' waits about 30 seconds after the 'exit 0' line is executed
before closing its end of the pipe. For example:
The command dumping to STDOUT:
root@kanga:/tmp# time jexec 8 sh -x /etc/rc.shutdown
+ stty status ^T
+ trap : 2
+ trap : 3
...
+ kill -TERM 80521
Terminated
+ echo .
.
+ exit 0
real 0m0.575s
user 0m0.043s
sys 0m0.195s
The command dumping to a pipe:
root@kanga:/tmp# time jexec 8 sh -x /etc/rc.shutdown | cat
+ stty status ^T
+ trap : 2
+ trap : 3
...
+ kill -TERM 80638
Terminated
+ echo .
.
+ exit 0
real 0m30.049s
user 0m0.070s
sys 0m0.162s
I'm at a loss. Why would this be? Are there workarounds?
=2D-=20
Kirk Strauser
"94 outdated ports on the box,
94 outdated ports.
Portupgrade one, an hour 'til done,
82 outdated ports on the box."
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