Re: [CODE] Booting a mud online

From: Mark A. Heilpern (
Date: 12/30/98

There might be an error in starting up your second mud; system()
[according to the man page on my machine] returns an error if this
is the case, but you're ignoring it. Also, since the path to your port
B binary is a relative one, keep in mind that CircleMUD changes its
directory upon startup, generally to your lib directory. (A -d newdir
command-line option can change this location.)

You might also want to consider not using system() and using fork()
with  execl() instead. This would be a little less overhead and would
not require a shell to be in the middle. To do this, you'd replace
your sprintf/system with:

   int return_value = fork();
   if (return_value==0) {
      /* this code is only reached by the child process which must execl */
      char main_pid[16];
      nice(20); /* you had a nice request in your system call */
      sprintf(main_pid,"%d",getppid());    /* getppid is not a typo here */
      return_value = execl("../../circle30bpl14/bin/temple.current", main_pid);
      if (return_value < 0) {
        /* log an error message; parameter problems, etc., to execl() will
cause errors here */
    } else if (return_value < 0) {
        /* log a failure message - couldn't fork. this will rarely happen */
    } else {
        /* log a success message; return_value is the pid of port B */

It's a few more lines of code, but it gives you better return information.

At 05:47 PM 12/30/98 +1000, you wrote:
>Hi...I'm trying to create a command (if poss.) which'll boot another port
>of mine up when I'm online.  I.e. boot port B when I'm active on port A...
>My code looks like:
>  char buf[100];
>  sprintf(buf, "nice ../../circle30bpl14/bin/temple.current %d &", (int)
>  system(buf);
>  mudlog("Booting up Port 1502...", CMP, LVL_IMPL, FALSE);
>  send_to_char(OK, ch);
>I figure there's something wrong in the sprintf line...the mudlog shows up
>fine, but the binary doesnt get called.
>Can anyone help?
> Julian Buckley, 3rd Year Computer Systems Engineering
> Dept. Computer Science and Electrical Engineering, Univ. of Qld
> E-Mail:
> Web Page:
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