I seen what sendmail actually changes they arguments of command line for nice output of "ps ax" command.

May be it changes his argc/argv for this?

mimocrocodil <4denizzz@gmail.com> writes:

> I seen what sendmail actually changes they arguments of command line for nice output of "ps ax" command.
>
> May be it changes his argc/argv for this?

Yes.  Some unix C programs, daemons usually, modify argv to change what ps shows.  It works with D too, I tried it (but have to cast away immutable).   Here is a quick demo, assuming args[0] has enough room.

import std.c.string;
import core.thread;

void main(string[] args)
{
   auto a = cast(char*)args[0].ptr;
   strcpy(a, "xyzzy");  // change ps output to list us as xyzzy
   Thread.sleep(dur!("seconds")(10));
}

$ ps
  PID TTY           TIME CMD
  355 ttys000    0:00.01 /bin/bash --noediting -i
  358 ttys000    0:00.00 xyzzy

Since you have to be unsafe anyway, casting to char* from in string would be no worse than string.