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.