Fortran · File status code
What does IOSTAT 30 — Open Failure mean in Fortran?
A generic OPEN (or INQUIRE) failure the runtime couldn't attribute to a more specific condition like file-not-found or permission-denied — often surfaces on unusual devices, segmented files, or when reopening a unit already tied to standard I/O.
A generic OPEN (or INQUIRE) failure the runtime couldn't attribute to a more specific condition like file-not-found or permission-denied — often surfaces on unusual devices, segmented files, or when reopening a unit already tied to standard I/O.
Add IOSTAT and IOMSG to the OPEN statement to capture the underlying OS error text, since the bare error number alone doesn't say which precondition failed.