Maximum FD Number

Hello all,

Just some simple questions to verify I'm right in my expectations:
I believe that whenever a file descriptor is opened it uses the lowest available file descriptor number, is that correct? If so, am I right in thinking I can get the maximum file descriptor number the program can ever get can be retrieved by calling getrlimit with RLIMIT_NOFILE? Because if you open exactly that many files (you can't open more), the maximum number would be RLIMIT_NOFILE.

Is this correct?


Thanks in advance

That's what the manual says

Quote:

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RLIMIT_NOFILE
This is a number one greater than the maximum value that the system may assign to a newly-created descriptor. If this limit is exceeded, functions that allocate a file descriptor shall fail with errno set to [EMFILE]. This limit constrains the number of file descriptors that a process may allocate.

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Quote:

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Originally Posted by Salem

That's what the manual says

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Ahh that wasn't in the {g,s}etrlimit manual ;-). Thanks!