COBOL Manual for TNS and TNS/R Programs

Procedure Division Verbs
HP COBOL Manual for TNS and TNS/R Programs—522555-006
9-64
ENTER
In the non-CRE environment (but not the CRE), an HP COBOL program cannot
call an HP C or HP C++ function for which any of these conditions are true:
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The function directly or indirectly allocates or deallocates controlled storage.
°
The function performs HP C or HP C++ input-output operations.
°
The function directly or indirectly accesses the HP C function getenv.
Do not include the GIVING phrase in an ENTER statement that accesses an HP C
or HP C++ function whose type is a pointer or whose type designation includes the
modifier “unsigned.” The type “char” is included in this prohibition, because the
HP C compiler and the HP C++ compiler interpret it as the type “unsigned char.”
The type “signed char” is acceptable.
When the formal parameter for an HP C or HP C++ function is a scalar variable, its
type designation cannot include the modifier “unsigned.” The type “char” is include
in this prohibition, because the HP C and HP C++ compilers interpret it as the type
“unsigned char.” The type “signed char” is acceptable.
Because the names of HP C++ routines are often modified to reflect their classes
and argument types, it is recommended that HP COBOL programs call only regular
HP C++ functions, not constructs that are peculiar to HP C++ (such as member
functions and templates).
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Restrictions on Calling FORTRAN Routines
Do not pass literals or expressions to FORTRAN routines. The FORTRAN
language has no way to specify that it expects to receive a parameter by value (all
parameters are passed to FORTRAN routines by reference).
If a program includes both HP COBOL and FORTRAN routines, these restrictions
apply to input-output operations:
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All input-output operations done on a particular file must be performed within
one language or by routines provided by HP.
°
In the non-CRE environment (but not the CRE), an HP COBOL routine must
handle process termination. If execution terminates in FORTRAN code, the
run-time routines do not have a chance to complete any possible pending
input-output operations and lines of printer or terminal output are likely to be
lost.
°
In the CRE, the HP COBOL and FORTRAN routines can share IN, OUT, and
$RECEIVE files.
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Restrictions on Calling Pascal Routines
In the non-CRE environment (but not in the CRE), an HP COBOL program cannot
call a Pascal routine that directly or indirectly allocates or deallocates controlled
storage or performs Pascal input-output operations.