From @zoffixznet

Opening a ticket, per Raku/roast#339

-----------8<-------------------------

$*PROGRAM-NAME is supposed to be a replacement for Perl 5's $0, but it doesn't work that way.

What I'd expect to work​:

use v6;
$*PROGRAM-NAME = 'foo';
say `ps $$`;
=output
Cannot modify an immutable Str (test.pl)
  in block <unit> at test.pl line 2
What should happen​:

use v5.26;
$0 = "foo";
say `ps $$`;
__DATA__
# PID TTY STAT TIME COMMAND
# 5875 pts/1 S+ 0​:00 foo

From @geekosaur

On Sun, Oct 1, 2017 at 12​:35 PM, Zoffix Znet <perl6-bugs-followup@​perl.org>
wrote​:

$*PROGRAM-NAME is supposed to be a replacement for Perl 5's $0, but it
doesn't work that way.

What I'd expect to work​:

use v6;
$*PROGRAM-NAME = 'foo';

This is not portable and not reliable --- although it will probably work on
the limited set of systems moarvm/rakudo currently run on. But the linked
ticket is not quite right either​: even on Unix-likes that support it, the
result would be shown by 'ps' as something like 'foo [moarvm]' (exact
format will depend on OS and/or 'ps' implementation). This is forced for
security-related reasons, and you can't override the process's execname to
control the part in brackets.

--
brandon s allbery kf8nh sine nomine associates
allbery.b@​gmail.com ballbery@​sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net

The RT System itself - Status changed from 'new' to 'open'

From @AlexDaniel

I wonder if this needs a separate sub or variable instead of adding secret functionality to $*PROGRAM-NAME.

On 2017-10-01 09​:52​:19, allbery.b@​gmail.com wrote​:

On Sun, Oct 1, 2017 at 12​:35 PM, Zoffix Znet <perl6-bugs-followup@​perl.org>
wrote​:

$*PROGRAM-NAME is supposed to be a replacement for Perl 5's $0, but it
doesn't work that way.

What I'd expect to work​:

use v6;
$*PROGRAM-NAME = 'foo';

This is not portable and not reliable --- although it will probably work on
the limited set of systems moarvm/rakudo currently run on. But the linked
ticket is not quite right either​: even on Unix-likes that support it, the
result would be shown by 'ps' as something like 'foo [moarvm]' (exact
format will depend on OS and/or 'ps' implementation). This is forced for
security-related reasons, and you can't override the process's execname to
control the part in brackets.