05-21-2010
defunct processes?
HiI had a tool fail recently, on analysis I found it was cleaning up orphaned directories that had been created by specific processes that had died for some reason, thus failing to clean up after themselves.The directories were of the form /dir.pid. The tool would look to see if any instances of the process were running under that pid and if not would clear away the directory. It was failing because intermmittently it was seeing a instance of the pid in the ps output.I put a trap in for this (grep -vi) and all seemed well but I have now seen it fail once more, unfortunately with no trace on. I cannot replicate it as it is now so intermittent with the fix I mentioned in place.My question is "Are there any other ways a dead process can show up in the ps output and if so what should I be grepping for"?CheersPS Sorry if the format of this post is rough, my work PC is locked down and doesn't seem able to handle the java very well.
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pid(n) Tcl Built-In Commands pid(n)
__________________________________________________________________________________________________________________________________________________
NAME
pid - Retrieve process identifiers
SYNOPSIS
pid ?fileId?
_________________________________________________________________
DESCRIPTION
If the fileId argument is given then it should normally refer to a process pipeline created with the open command. In this case the pid
command will return a list whose elements are the process identifiers of all the processes in the pipeline, in order. The list will be
empty if fileId refers to an open file that is not a process pipeline. If no fileId argument is given then pid returns the process identi-
fier of the current process. All process identifiers are returned as decimal strings.
EXAMPLE
Print process information about the processes in a pipeline using the SysV ps program before reading the output of that pipeline:
set pipeline [open "| zcat somefile.gz | grep foobar | sort -u"]
# Print process information
exec ps -fp [pid $pipeline] >@stdout
# Print a separator and then the output of the pipeline
puts [string repeat - 70]
puts [read $pipeline]
close $pipeline
SEE ALSO
exec(n), open(n)
KEYWORDS
file, pipeline, process identifier
Tcl 7.0 pid(n)