Setting env var CYGWIN for Cygwin service?

[Oleksandr Gavenko]

On 2020-12-31, Franz Fehringer via Cygwin wrote:

> Cygwin inherits Windows environment variables, this should be the simplest take.

Normally does, no doubt.

So I made `srv.c`:

  #include <unistd.h>
  int main() {
      sleep(60);
  }

compiled:

  gcc -o srv.exe srv.c

registered:

  cygrunsrv -I mysrv -t manual -p $PWD/srv.exe -c $PWD -e MY=hello -d "My Srv" -f "Testing Cyg Service"

  $ cygrunsrv -L
  exim
  mysrv

launched:

  cygrunsrv --start mysrv

Finally checked with Process Explorer:

* corresponding `cygrunsrv` had many env vars
* my `srv.exe` had only:

>    PATH
>    SYSTEMDRIVE
>    SYSTEMROOT
>    WINDIR

Same was for exim as I wrote earlier. `cygrunsrv` has everything, `exim` only
4 env vars.

  uname -r
  3.1.7(0.340/5/3)

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