Pretty clear, thanks! :-)
So, to "fix" this rc would need an option to know to rfork(RFENVG)
before doing anything else.
Something like:
-f [nNeEsfFm] Start as a new process group using rfork(flags)
This way lc would produce not surprises by simply adding "-f e" to the
first line.
It shouldn't be an hard fix, but I wonder if it's actually worth the effort.
Also, probably -f is not the best flag here as it usually mean "file"...
-r would be a better choice, but it's taken for debugging output.
I might use -d for debugging output since -d is a no-op (why?) and -r
for this early rfork, but I have no idea of what it would broke.
Giacomo
2017-10-18 19:25 GMT+02:00 Skip Tavakkolian <skip.tavakkol...@gmail.com>:
> yes. lc -- an rc script -- shares the environment with the rc that starts
> it; so env is updated with arglist of lc. $* is the arglist that parent
> (interactive) rc was started with. rc(1) says:
>
> $* Set to rc's argument list during initialization.
> Whenever a . command or a function is executed, the
> current value is saved and $* receives the new
> argument list. The saved value is restored on com-
> pletion of the . or function.
>
> if lc was a function, there would be no surprises:
>
> % cat /bin/lc
> #!/bin/rc
> ls -p $* | mc
> % fn LC { ls -p $* | mc }
> % echo $*
>
> % cat '/env/*'
> % LC >/dev/null
> % echo $*
>
> % cat '/env/*'
> %
>
> On Wed, Oct 18, 2017 at 9:02 AM Antons Suspans <an...@ml.lv> wrote:
>>
>> On Wed, Oct 18, 2017 at 05:31:28PM +0200, Giacomo Tesio wrote:
>> > I have been a bit surprised to see that $* does not always contains
>> > the same as '/env/*':
>> >
>> > % echo $*
>> >
>> > % cat '/env/*'
>> > % lc
>> > bin/ lib/ tmp/
>> > % echo $*
>> >
>> > % cat '/env/*'
>> > /bin/lc%
>> >
>> > Not really an issue, but why this happens?
>>
>> I guess...
>>
>> When starting a command from rc, execforkexec() does fork(), which
>> is an equivalent of rfork(RFFDG|RFREND|RFPROC) and does not imply RFENVG.
>>
>> As lc(1) is a shell script, its shell instance sets /env/'*'.
>>
>> Hope this helps.
>>
>> --
>> Antons
>>
>
