MirOS Manual: vmsish(3p)


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

NAME

     vmsish - Perl pragma to control VMS-specific language
     features

SYNOPSIS

         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';

DESCRIPTION

     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$_NORMAL), instead of emulating UNIX exit(),
           which considers "exit 1" to indicate an error.  As
           with the CRTL's exit() function, "exit 0" is also
           mapped to an exit status of SS$_NORMAL, and any other
           argument to exit() 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

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

           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 compila-
           tion: the exit() or die() 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 vmsish::hushed().  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) {
                   vmsish::hushed(1);
               }
               print "Sssshhhh...I'm hushed...\n" if
           vmsish::hushed();
               exit 44;

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

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

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

     See "Pragmatic Modules" in perlmod.

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