/usr/lib/iraf/lib/diropen.h is in iraf-dev 2.16.1+2018.03.10-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # DIROPEN.H -- Defined parameters for fio.diropen. Two directory access modes
# are permitted, pass all files and skip hidden files (files generated and
# used internally by the system).
define SKIP_HIDDEN_FILES 0
define PASS_HIDDEN_FILES 1
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