Just make sure your flock command references the number of the file descriptor applied. Glad you found it :)https://www.experts-exchange.com/questions/23957725/Getting-error-bad-file-descriptor-in-very-simple-open-and-flock-statements.html With advanced shells (bash, ksh93, zsh), the … (No credit card required) Our community of experts have been thoroughly vetted for their expertise and industry experience.
Why do I do that? https://github.com/ansible/awx/blob/4.0.0/awx/main/tasks.py#L1853 fcntl.flock (os.open ()) does not work on NFS mount. flock -e myfile.lock ls The number is the file descriptor of the usage alternativ: ( flock -e 200 ls ) 200>myfile.lock See the man page. 200 is a file descriptor applied to “/var/lock/mylockfile” in the above. To solve this problem, here are the steps to increase this limit. Please provide your email to receive a sample view! The main error is in flock () which still says "bad file descriptor" I am using open (), write () etc. For example, to increase limit by user apache we do as follows.Use following command to see max limit of file descriptors:Fill in your details below or click an icon to log in:Enter your email address to follow this blog and receive notifications of new posts by email. touch resp.txt ( flock -e 200 curl 'someurl' -H 'someHeader' > resp.txt ) 200< resp.txt to place the lock on the file opened as read only. The code opens mylockfile as file descriptor 9, then applies the flock command on that file descriptor. This award recognizes someone who has achieved high tech and professional accomplishments as an expert in a specific topic. UNLOCK SOLUTION fcntl.flock (open ()) does work, or at least does not fail.
The man page I just read uses 200.

I suppose a comparably high number avoids possible clashes with existing file descriptors. Which will give you error in apache like “ Fatal Error Unable to create lock file: Bad file descriptor (9) “. It is recommended you use a relatively high number. Any number is fine. This award recognizes someone who has achieved high tech and professional accomplishments as an expert in a specific topic. To see the hard and soft values,Note: If we need to increase limit by user then we need to replace * with username. https://www.experts-exchange.com/questions/23957725/Getting-error-bad-file-descriptor-in-very-simple-open-and-flock-statements.html Moreover the hardcoded file descriptor may already be used. Some shells do not support file descriptors larger than 9. Our community of experts have been thoroughly vetted for their expertise and industry experience. This award recognizes someone who has achieved high tech and professional accomplishments as an expert in a specific topic. Unlock this solution and get a sample of our free trial. *This site is protected by reCAPTCHA and the Google Some programs like Apache and MySQL requires a higher number of file descriptors.By default its  1024, which is not enough for current high load servers. >> The main error is in flock() which still says "bad file descriptor" Got it... On some systems, Perl's flock implementation requires that the file be opened for writing. You don’t need to use the number “200”, you can use just about any number. If you expect that the file already exists, you could do it this way: open (HTML_FILE, … Some programs like Apache and MySQL requires a higher number of file descriptors.By default its 1024, which is not enough for current high load servers.

Our community of experts have been thoroughly vetted for their expertise and industry experience. because I had started working with an integer file descriptor instead of a file pointer. File descriptor obtained using os.open () cannot be used in fcntl.flock () call when the file is on NFS mount. Alright, I agree I'm dumb :(


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