by Peter Seibe » Sat, 11 May 1996 04:00:00
I need to kill (actually kill -HUP) a process from within a perl
script. Is there any way for the script to test it's ability to do this
without actually doing it? My actual problem is a script that is cutting
off the logs from a web server. So it moves the logs and then restarts
the web server. But I don't want to move the logs unless I'm actually
going to be able to restart the server. So, any way to do this?
Thanks in advance.
-Peter
--
by David DeSimo » Sun, 12 May 1996 04:00:00
The usual method is to kill the process with signal 0. This causes theQuote:> I need to kill (actually kill -HUP) a process from within a perl
> script. Is there any way for the script to test it's ability to do
> this without actually doing it?
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If I said it, it | DEC, World Future Society Convention, 1977
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by Peter Seibe » Fri, 17 May 1996 04:00:00
>> I need to kill (actually kill -HUP) a process from within a perl
>> script. Is there any way for the script to test it's ability to do
>> this without actually doing it?
DD> The usual method is to kill the process with signal 0. This causes
DD> the usual permission checks to be made, but does not actually
DD> signal the process.
Thanks to all the folks who pointed this out. Just to be clear -- does
the ability to kill 0 a process imply the ability to kill n the process
for all n (in the set of signals, obviously.)?
-Peter
--
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by Stephen M. Du » Tue, 21 May 1996 04:00:00
$I need to kill (actually kill -HUP) a process from within a perl
$script. Is there any way for the script to test it's ability to do this
$without actually doing it? My actual problem is a script that is cutting
$off the logs from a web server. So it moves the logs and then restarts
$the web server. But I don't want to move the logs unless I'm actually
$going to be able to restart the server. So, any way to do this?
This is a Unix answer, not a Perl one ... but isn't that what kill -0
is for?
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1. How can kill all child processes without killing parent process ?
: Hi all UNIX expert,
: I am now writing a shell script to kill all child processes of a
: particular process. I have written the following
: script:
: ps -ef | grep o\\ra | awk '{print $2}' | xargs kill
: where ora is the name of the parent process
: However, this shell script only kills out the parent process,
: Does anyone know how to kill all child process without
: killing that parent process ? Please advise !!! Many thanks !!!
: Have a nice UNIX day !!!
you will have to read all matching processes and only kill the last in the
chain by using PID and PPID; unfortunately we can not assume that the
child is the process with the highest PPID:
assume $2=PID , $3=PPID ( coming from ps -ef | grep o\\ra | grep -v grep )
{
PID[ $2 ]=""
PPID[ $3 ]=""
END{
# process ids which are also parents should be deleted
for( pid in PPID ) if ( pid in PID ) delete PID[ pid ]
for( pid in PID ) { do_whatever_you_like_on_your_own_risk( pid ) }
}
function do_whatever_you_like_on_your_own_risk( param ){
code...
}
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