Library /sys$common/syshlp/helplib.hlb  —  CRTL  fpathconf  Return Values
    x                  The resultant value for the configuration
                       attribute specified in the name argument.
    -1                 Indicates an error; errno is set to one of the
                       following values:

                       o  EINVAL - The name argument specifies an
                          unknown or inapplicable characteristic.

                       o  EBADF - the filedes argument is not a valid
                          file descriptor.
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