Why the 30-second pause after executing this script?
Kirk Strauser
kirk at strauser.com
Fri Apr 9 05:25:42 PDT 2004
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 at 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 at 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?
--
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"94 outdated ports on the box,
94 outdated ports.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82 outdated ports on the box."
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