1vmsish(3pm) Perl Programmers Reference Guide vmsish(3pm)
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6 vmsish - Perl pragma to control VMS-specific language features
7
9 use vmsish;
10 use vmsish 'status'; # or '$?'
12 use vmsish 'exit';
13 use vmsish 'time';
14 use vmsish 'hushed';
16 no vmsish 'hushed';
17 vmsish::hushed($hush);
18 use vmsish;
20 no vmsish 'time';
21
23 If no import list is supplied, all possible VMS-specific features are
24 assumed. Currently, there are four VMS-specific features available:
25 'status' (a.k.a '$?'), 'exit', 'time' and 'hushed'.
26 If you're not running VMS, this module does nothing.
28 "vmsish status"
30 This makes $? and "system" return the native VMS exit status
31 instead of emulating the POSIX exit status.
32 "vmsish exit"
34 This makes "exit 1" produce a successful exit (with status
35 SS$_NORMAL), instead of emulating UNIX exit(), which considers
36 "exit 1" to indicate an error. As with the CRTL's exit()
37 function, "exit 0" is also mapped to an exit status of
38 SS$_NORMAL, and any other argument to exit() is used directly as
39 Perl's exit status.
40 "vmsish time"
42 This makes all times relative to the local time zone, instead of
43 the default of Universal Time (a.k.a Greenwich Mean Time, or
44 GMT).
45 "vmsish hushed"
47 This suppresses printing of VMS status messages to SYS$OUTPUT and
48 SYS$ERROR if Perl terminates with an error status, and allows
49 programs that are expecting "unix-style" Perl to avoid having to
50 parse VMS error messages. It does not suppress any messages from
51 Perl itself, just the messages generated by DCL after Perl exits.
52 The DCL symbol $STATUS will still have the termination status,
53 but with a high-order bit set:
54 EXAMPLE:
56 $ perl -e"exit 44;" Non-hushed
57 error exit
58 %SYSTEM-F-ABORT, abort DCL message
59 $ show sym $STATUS
60 $STATUS == "%X0000002C"
61 $ perl -e"use vmsish qw(hushed); exit 44;" Hushed error exit
63 $ show sym $STATUS
64 $STATUS == "%X1000002C"
65 The 'hushed' flag has a global scope during compilation: the
67 exit() or die() commands that are compiled after 'vmsish hushed'
68 will be hushed when they are executed. Doing a "no vmsish
69 'hushed'" turns off the hushed flag.
70 The status of the hushed flag also affects output of VMS error
72 messages from compilation errors. Again, you still get the Perl
73 error message (and the code in $STATUS)
74 EXAMPLE:
76 use vmsish 'hushed'; # turn on hushed flag
77 use Carp; # Carp compiled hushed
78 exit 44; # will be hushed
79 croak('I die'); # will be hushed
80 no vmsish 'hushed'; # turn off hushed flag
81 exit 44; # will not be hushed
82 croak('I die2'): # WILL be hushed, croak was compiled
83 hushed
84 You can also control the 'hushed' flag at run-time, using the
86 built-in routine vmsish::hushed(). Without argument, it returns
87 the hushed status. Since vmsish::hushed is built-in, you do not
88 need to "use vmsish" to call it.
89 EXAMPLE:
91 if ($quiet_exit) {
92 vmsish::hushed(1);
93 }
94 print "Sssshhhh...I'm hushed...\n" if vmsish::hushed();
95 exit 44;
96 Note that an exit() or die() that is compiled 'hushed' because of
98 "use vmsish" is not un-hushed by calling vmsish::hushed(0) at
99 runtime.
100 The messages from error exits from inside the Perl core are
102 generally more serious, and are not suppressed.
103 See "Perl Modules" in perlmod.
105perl v5.16.3 2013-03-04 vmsish(3pm)