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

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() func-

tion, "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 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

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 ($quietexit) {

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.

The messages from error exits from inside the Perl core are gen-

erally more serious, and are not suppressed. See "Pragmatic Modules" in perlmod.