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File vmsish.pm

package vmsish;

our $VERSION = '1.04';

=head1 NAME

vmsish - Perl pragma to control VMS-specific language features

=head1 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';

=head1 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.

=over 6

=item C<vmsish status>

This makes C<$?> and C<system> return the native VMS exit status
instead of emulating the POSIX exit status.

=item C<vmsish exit>

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

=item C<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).

=item C<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 ($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.

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

=back

See L<perlmod/Perl Modules>.

=cut

my $IsVMS = $^O eq 'VMS';

sub bits {
    my $bits = 0;
    my $sememe;
    foreach $sememe (@_) {
	# Those hints are defined in vms/vmsish.h :
	# HINT_M_VMSISH_STATUS and HINT_M_VMSISH_TIME
        $bits |= 0x40000000, next if $sememe eq 'status' || $sememe eq '$?';
	$bits |= 0x80000000, next if $sememe eq 'time';
    }
    $bits;
}

sub import {
    return unless $IsVMS;

shift;
    $^H |= bits(@_ ? @_ : qw(status time));
    my $sememe;

foreach $sememe (@_ ? @_ : qw(exit hushed)) {
        $^H{'vmsish_exit'}   = 1 if $sememe eq 'exit';
        vmsish::hushed(1) if $sememe eq 'hushed';
    }
}

sub unimport {
    return unless $IsVMS;

shift;
    $^H &= ~ bits(@_ ? @_ : qw(status time));
    my $sememe;

foreach $sememe (@_ ? @_ : qw(exit hushed)) {
        $^H{'vmsish_exit'}   = 0 if $sememe eq 'exit';
        vmsish::hushed(0) if $sememe eq 'hushed';
    }
}

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
..	DIR	-	drwxr-xr-x	2025-10-16 10:59:21
Attribute	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
B	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
CPAN	DIR	-	drwxr-xr-x	2024-03-13 04:56:46
Class	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Compress	DIR	-	drwxr-xr-x	2024-03-13 04:36:57
Config	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
DBM_Filter	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Devel	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
ExtUtils	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
File	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Getopt	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
I18N	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IO	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IPC	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Locale	DIR	-	drwxr-xr-x	2025-07-28 08:08:32
Math	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Memoize	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Module	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Net	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Search	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Term	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Text	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Thread	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Tie	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Time	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
URI	DIR	-	drwxr-xr-x	2024-03-13 04:36:40
Unicode	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
User	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
encoding	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
overload	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
unicore	DIR	-	drwxr-xr-x	2025-07-29 10:57:24
vendor_perl	DIR	-	drwxr-xr-x	2025-07-28 08:07:18
warnings	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
AnyDBM_File.pm	text/plain	2.56 KB	-rw-r--r--	2025-07-28 08:07:09
AutoLoader.pm	text/plain	15.43 KB	-rw-r--r--	2025-07-28 08:07:09
AutoSplit.pm	text/plain	19.18 KB	-rw-r--r--	2025-07-28 08:07:09
Benchmark.pm	text/plain	30.3 KB	-rw-r--r--	2025-07-28 08:07:09
CORE.pod	text/plain	3.11 KB	-rw-r--r--	2025-07-28 08:07:09
DB.pm	text/plain	18.48 KB	-rw-r--r--	2025-07-28 08:07:09
DBM_Filter.pm	text/plain	14.05 KB	-rw-r--r--	2025-07-28 08:07:09
DirHandle.pm	text/plain	1.52 KB	-rw-r--r--	2025-07-28 08:07:09
Dumpvalue.pm	text/plain	17.14 KB	-rw-r--r--	2025-07-28 08:07:09
English.pm	text/plain	4.65 KB	-rw-r--r--	2025-07-28 08:07:09
FileCache.pm	text/plain	5.44 KB	-rw-r--r--	2025-07-28 08:07:09
FileHandle.pm	text/plain	6.63 KB	-rw-r--r--	2025-07-28 08:07:09
FindBin.pm	text/plain	4.45 KB	-rw-r--r--	2025-07-28 08:07:09
Internals.pod	text/plain	2.52 KB	-rw-r--r--	2025-07-28 08:07:09
Memoize.pm	text/plain	35.34 KB	-rw-r--r--	2025-07-28 08:08:32
NEXT.pm	text/plain	18.4 KB	-rw-r--r--	2025-07-28 08:07:09
PerlIO.pm	text/plain	10.21 KB	-rw-r--r--	2025-07-28 08:07:09
Safe.pm	text/plain	24.49 KB	-rw-r--r--	2025-07-28 08:07:09
SelectSaver.pm	text/plain	1.05 KB	-rw-r--r--	2025-07-28 08:07:09
SelfLoader.pm	text/plain	17.28 KB	-rw-r--r--	2025-07-28 08:08:32
Symbol.pm	text/plain	4.69 KB	-rw-r--r--	2025-07-28 08:07:09
Test.pm	text/plain	29.35 KB	-rw-r--r--	2025-07-28 08:08:32
Thread.pm	text/plain	8.09 KB	-rw-r--r--	2025-07-28 08:07:09
UNIVERSAL.pm	text/plain	6.44 KB	-rw-r--r--	2025-07-28 08:07:09
URI.pm	text/plain	33.97 KB	-rw-r--r--	2018-01-09 06:42:55
XSLoader.pm	text/plain	11 KB	-rw-r--r--	2025-07-28 08:07:09
_charnames.pm	text/plain	32.39 KB	-rw-r--r--	2025-07-28 08:07:09
autouse.pm	text/plain	4.14 KB	-rw-r--r--	2025-07-28 08:07:09
base.pm	text/plain	10.72 KB	-rw-r--r--	2025-07-28 08:07:09
blib.pm	text/plain	2.04 KB	-rw-r--r--	2025-07-28 08:07:09
bytes.pm	text/plain	3.67 KB	-rw-r--r--	2025-07-28 08:07:09
bytes_heavy.pl	text/plain	758 B	-rw-r--r--	2025-07-28 08:07:09
charnames.pm	text/plain	20.38 KB	-rw-r--r--	2025-07-28 08:07:09
deprecate.pm	text/plain	3.01 KB	-rw-r--r--	2025-07-28 08:07:09
diagnostics.pm	text/plain	18.59 KB	-rw-r--r--	2025-07-28 08:07:09
dumpvar.pl	text/plain	15.19 KB	-rw-r--r--	2025-07-28 08:07:09
feature.pm	text/plain	16.68 KB	-rw-r--r--	2025-07-28 08:07:09
fields.pm	text/plain	9.27 KB	-rw-r--r--	2025-07-28 08:07:09
filetest.pm	text/plain	3.91 KB	-rw-r--r--	2025-07-28 08:07:09
if.pm	text/plain	3.26 KB	-rw-r--r--	2025-07-28 08:07:09
integer.pm	text/plain	3.18 KB	-rw-r--r--	2025-07-28 08:07:09
less.pm	text/plain	3.13 KB	-rw-r--r--	2025-07-28 08:07:09
locale.pm	text/plain	4.74 KB	-rw-r--r--	2025-07-28 08:07:09
meta_notation.pm	text/plain	2.07 KB	-rw-r--r--	2025-07-28 08:07:09
open.pm	text/plain	7.83 KB	-rw-r--r--	2025-07-28 08:08:32
overload.pm	text/plain	52.06 KB	-rw-r--r--	2025-07-28 08:07:09
overloading.pm	text/plain	1.77 KB	-rw-r--r--	2025-07-28 08:07:09
perl5db.pl	text/plain	309 KB	-rw-r--r--	2025-07-28 08:07:09
sigtrap.pm	text/plain	7.43 KB	-rw-r--r--	2025-07-28 08:07:09
sort.pm	text/plain	5.94 KB	-rw-r--r--	2025-07-28 08:07:09
strict.pm	text/plain	4.63 KB	-rw-r--r--	2025-07-28 08:07:09
subs.pm	text/plain	848 B	-rw-r--r--	2025-07-28 08:07:09
utf8.pm	text/plain	8.9 KB	-rw-r--r--	2025-07-28 08:07:09
utf8_heavy.pl	text/plain	30.87 KB	-rw-r--r--	2025-07-28 08:07:09
vars.pm	text/plain	2.36 KB	-rw-r--r--	2025-07-28 08:07:09
vmsish.pm	text/plain	4.21 KB	-rw-r--r--	2025-07-28 08:07:09
warnings.pm	text/plain	43.71 KB	-rw-r--r--	2025-07-28 08:07:09

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