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7.5.6.7 Arg Type File Name

arg-type = file;

This argument type will have some validations on the argument and, optionally, actually open the file. You must specify several additonal attributes for the option:

file-exists

If not specified or empty, then the directory portion of the name is checked. The directory must exist or the argument is rejected and the usage procedure is invoked.

Otherwise, both the directory as above and the full name is tested for existence. If the value begins with the two letters no, then the file must not pre-exist. Otherwise, the file is expected to exist.

open-file

If not specified or empty, the file is left alone. If the value begins with the four letters desc[riptor], then open(2) is used and optArg.argFd is set. Otherwise, the file is opened with fopen and optArg.argFp is set.

file-mode

If open-file is set and not empty, then you must specify the open mode. Set the value to the flag bits or mode string as appropriate for the open type.


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