vmsish(3p) Perl Programmers Reference Guide vmsish(3p) #

vmsish(3p) Perl Programmers Reference Guide vmsish(3p)

NNAAMMEE #

 vmsish - Perl pragma to control VMS-specific language features

SSYYNNOOPPSSIISS #

     use vmsish;

     use vmsish 'status';        # or '$?'
     use vmsish 'exit';
     use vmsish 'time';

     use vmsish 'hushed';
     no vmsish 'hushed';
     vmsish::hushed($hush);

     use vmsish;
     no vmsish 'time';

DDEESSCCRRIIPPTTIIOONN #

 If no import list is supplied, all possible VMS-specific features are
 assumed.  Currently, there are four VMS-specific features available:
 'status' (a.k.a '$?'), 'exit', 'time' and 'hushed'.

 If you're not running VMS, this module does nothing.

 "vmsish status"
       This makes $? and "system" return the native VMS exit status
       instead of emulating the POSIX exit status.

 "vmsish exit"
       This makes "exit 1" produce a successful exit (with status
       SS$_NORMAL), instead of emulating UNIX eexxiitt(()), which considers
       "exit 1" to indicate an error.  As with the CRTL's eexxiitt(()) function,
       "exit 0" is also mapped to an exit status of SS$_NORMAL, and any
       other argument to eexxiitt(()) is used directly as Perl's exit status.

 "vmsish time"
       This makes all times relative to the local time zone, instead of
       the default of Universal Time (a.k.a Greenwich Mean Time, or GMT).

 "vmsish hushed"
       This suppresses printing of VMS status messages to SYS$OUTPUT and
       SYS$ERROR if Perl terminates with an error status, and allows
       programs that are expecting "unix-style" Perl to avoid having to
       parse VMS error messages.  It does not suppress any messages from
       Perl itself, just the messages generated by DCL after Perl exits.
       The DCL symbol $STATUS will still have the termination status, but
       with a high-order bit set:

EXAMPLE: #

           $ perl -e"exit 44;"                          Non-hushed error
       exit
           %SYSTEM-F-ABORT, abort                       DCL message
           $ show sym $STATUS

$STATUS == “%X0000002C” #

           $ perl -e"use vmsish qw(hushed); exit 44;"   Hushed error exit
           $ show sym $STATUS

$STATUS == “%X1000002C” #

       The 'hushed' flag has a global scope during compilation: the eexxiitt(())
       or ddiiee(()) commands that are compiled after 'vmsish hushed' will be
       hushed when they are executed.  Doing a "no vmsish 'hushed'" turns
       off the hushed flag.

       The status of the hushed flag also affects output of VMS error
       messages from compilation errors.   Again, you still get the Perl
       error message (and the code in $STATUS)

EXAMPLE: #

           use vmsish 'hushed';    # turn on hushed flag
           use Carp;          # Carp compiled hushed
           exit 44;           # will be hushed
           croak('I die');    # will be hushed
           no vmsish 'hushed';     # turn off hushed flag
           exit 44;           # will not be hushed
           croak('I die2'):   # WILL be hushed, croak was compiled hushed

       You can also control the 'hushed' flag at run-time, using the
       built-in routine vvmmssiisshh::::hhuusshheedd(()).  Without argument, it returns
       the hushed status.  Since vmsish::hushed is built-in, you do not
       need to "use vmsish" to call it.

EXAMPLE: #

           if ($quiet_exit) {
               vvmmssiisshh::::hhuusshheedd(1);
           }
           print "Sssshhhh...I'm hushed...\n" if vvmmssiisshh::::hhuusshheedd(());
           exit 44;

       Note that an eexxiitt(()) or ddiiee(()) that is compiled 'hushed' because of
       "use vmsish" is not un-hushed by calling vvmmssiisshh::::hhuusshheedd(0) at
       runtime.

       The messages from error exits from inside the Perl core are
       generally more serious, and are not suppressed.

 See "Perl Modules" in perlmod.

perl v5.36.3 2014-11-17 vmsish(3p)