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Lock out other users of script

Posted on 1998-10-19
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Last Modified: 2010-03-05
I have a script called by form on html.  I would like to lock out any other user from accessing that script while another person is accessing it.  I have flock on the files, but need to lock out the whole script when in use.  Perl is running on a unix system.
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Question by:Lee5
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Expert Comment

by:ozo
ID: 1205511
Doesn't a flock at the start of your script do what you want?
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Author Comment

by:Lee5
ID: 1205512
ozo
It is my understanding that flock only works on open files.
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Expert Comment

by:ozo
ID: 1205513
yes, can't you open a file?
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Author Comment

by:Lee5
ID: 1205514
  yes, but as soon as I close the file the flock leaves.  I also understand that flock is only for that file.  Some of my scripts open and close several files, sometimes a couple of times.  If one person starts a sequence and another can come and operate on the same variables, it could cause a mess.
I am looking for a way to prevent someone from accessing the script if it is being used.  
    I guess I could have a fake file that is opened and flocked at the beginning of the script and then closed at the end.  If the file is not accessible, it could send a message to try later.   Is that what you had in mind?
    If that is so, just make it an answer to my question.
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Expert Comment

by:ozo
ID: 1205515
So, don't close the file until the script is done.
Or don't close the file at all, and let it unlock when the script exits.
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Author Comment

by:Lee5
ID: 1205516
ozo
make it an answer
Thanks,
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ozo earned 50 total points
ID: 1205517
Just keep an exclusive flock on a file over the entire script.
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Expert Comment

by:ozo
ID: 1205518
You may want to make it a LOCK_NB, so you can test it and give an error message, instead of making the user wait.
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