FORTRAN Reference Manual

Compiler Directives
FORTRAN Reference Manual—528615-001
10-68
UNIT Compiler Directive
exclusion-code
is one of the following keywords: EXCLUSIVE, PROTECTED, or SHARED.
exclusion-code specifies the file exclusion mode. The default value is
SHARED.
EXT pri-ext
EXT ( pri-ext [, sec-ext ] )
pri-ext and sec-ext are integers in the range 0 through 32767 that
specify the primary and secondary extent size, in pages. If you omit sec-ext,
the compiler uses the value of pri-ext for sec-ext. The default value is
(1,1).
Considerations
•
You can use one of three methods to connect a unit to a file: the UNIT directive,
the TACL ASSIGN command, or the OPEN statement. The order of precedence of
these three methods is shown below:
?UNIT (7, $s.#1, UNITNAME output) <-- lowest
ASSIGN OUTPUT, $s.#titan
OPEN (7, FILE = '$print') <-- highest
For additional information, see Units on page 5-8.
•
You can specify the attributes for a range of units. The following example specifies
that the access code for units 8 through 11 is INPUT:
?UNIT (8 - 11, INPUT )
•
For a structured file, you must use the CREATE command of the FUP utility to
create the file and specify additional file attributes such as file type and record key
descriptions.
•
Units 4, 5, and 6 exist automatically, even if there are no UNIT directives defining
them.
•
Specify the UNIT directive either with the FORTRAN command (after the
semicolon following the object file name), or in the source input file before the first
FORTRAN statement.
Example
?UNIT ( 15-17, spec, REC 80, OUTPUT, PROTECTED )