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I am developing a backup utility and I am getting the error:
Too many open files in system
after it runs for a while. The error is returned by stat().
Since I am not actually opening any files (fopen()), my question is if any of the following functions (which I am using) take up a file descriptor, and if so, what can I do to release it?
getwd()chdir()mkdir()stat()time()
The functions you listed are safe; none of them return anything that you could “close”.
To find out more, run the command
lsof -p+ PID of your backup process. That will give you a list of files which the process has opened which in turn will give you an idea what is going on.See:
lsofmanual page.