[erlang-questions] erlsrv.html info

Wes James <>
Tue Dec 18 16:33:53 CET 2012


Thanks - I'll do some testing.

wes


On Tue, Dec 18, 2012 at 3:41 AM, Patrik Nyblom <> wrote:

>  On 12/14/2012 11:16 PM, Wes James wrote:
>
> Looking at this documentation to see where .erlang.cookie might be saved
> for a service (installed with erlsrv) so I don't have to do -cookie on the
> command line, the docs at:
>
> http://www.erlang.org/doc/man/erlsrv.html
>
> say that the default working directory is:
>
> %SystemDrive%%SystemPath%
>
> There is a %SystemDrive% in win 7 (type set in the cmd.exe window) but
> there is no %SystemPath%.  There is a %windir% and %SystemRoot% which are
> c:\windows on my system.  Anyway, I don't see .erlang.cookie in c:\windows
> after using erlsrv and starting the service. Where is .erlang.cookie for
> erlsrv services?
>
> Yes, the %SystemPath% is not present on modern Windows. The local
> administrator (which is the user that runs the service) has c:\Windows as
> home directory by default, but the service runs with c:\Windows\system32 as
> default directory.
>
> One way to make sure is to simply start a service with a debug console and
> add -emu_args as a parameter, click "Show message" or whatever your locale
> has to select in the dialogue that pops up (or does not pop up but starts
> to blink in the task bar) when you start such a service and then do a
> pwd(). In the Erlang shell that you will see the -home parameter.
>
> Example (replace mentally any paths with the appropriate ones for your
> system):
>
> C:\blabla> cd "c:\Program Files\erl5.9.3.1\erts-5.9.3.1\bin"
> C:\Program Files\erl5.9.3.1\erts-5.9.3.1\bin>erlsrv add testservice -debug
> console -arg -emu_args
> C:\Program Files\erl5.9.3.1\erts-5.9.3.1\bin>erlsrv start testservice
>
> ...click on the "show me the message" button in the service control
> manager dialogue, which will take you to a blank screen with only the
> Erlang shell of the service and a dialogue that can take you back to the
> desktop. In that shell, you will see the full command line to the VM
> including the '-home' parameter:
> ---------------
> Executing: C:\blablabla...\beam.smp.dll C:\blablabla...\beam.smp.dll --
> -root C:\blablabla -progname erl -- -home c:\Windows etc etc etc
> 1> pwd().
> c:/Windows/system32
> 2>
> ---------------
> ...click on the get me back button in the dialogue that hangs beside the
> shell. The directory after the -home in the "slogan" at the top of the
> shell should be the home directory. The result from pwd() is the default
> "current directory" of the service.
>
> So the .erlang.cookie should reside in what -home says, which corresponds
> to %SystemDrive%%SystemRoot%, while files created in current directory will
> go into whatever pwd() shows.
>
> Now stop and remove the service:
> C:\Program Files\erl5.9.3.1\erts-5.9.3.1\bin>erlsrv stop testservice
> ...will take some time because of the peculiarities of a debug console....
> C:\Program Files\erl5.9.3.1\erts-5.9.3.1\bin>erlsrv remove service
>
> Hope that helps!
>
> Cheers,
> /Patrik
>
>
> Thanks,
>
> wes
>
>
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