do you believe X-application will "kill" the CDE and come back to login dialog Post: 24884

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Top Forums Programming do you believe X-application will "kill" the CDE and come back to login dialog Post 24884 by Perderabo on Friday 19th of July 2002 08:58:41 AM

07-19-2002

Administrator Emeritus

I don't use Compaq. But there is something odd here. Yes, I would agree that if your tty field on "ps" is ??? then you have no controlling terminal. However it may be that you have either a session leader or a process group leader who does have a controlling terminal. I would just take extreme measures to make sure that this is not the case.

1) close all files. If no files are open, then no tty can be open.

2) fork() and let the parent exit. The child will continue to run. The parent might have been a process group leader. But the child cannot be one.

3) setsid() to become a session leader and process group leader.

4) fork() and let the parent exit. At this point the child has no process group leader nor a session group leader. It has no tty's open so it cannot have a controlling tty nor is it associated in any way with a process with a controlling terminal.

5) now run, but never open a tty. If you need to open a tty, fork, let the child it, then let the child exit.

This is more than should really be needed. But I'll bet the rent that it works.

Perderabo

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setpgrp

setpgrp(2)							System Calls Manual							setpgrp(2)

NAME

       setpgrp - set process group ID

SYNOPSIS

DESCRIPTION

       If  the	calling process is not already a session leader, sets the process group ID of the calling process to the process ID of the calling
       process.  If creates a new session, then the new session has no controlling terminal.

       The function has no effect when the calling process is a session leader.

   Security Restrictions
       Some or all of the actions associated with this system call may require privileges.  See privileges(5) for more information.

RETURN VALUE

       Upon successful completion, returns the new process group ID.

ERRORS

       If fails, no changes occur and (see errno(2)) is set to one of the following values:

	      The calling process is already a process group leader or
			     the process group ID of a process other than the calling process matches the process ID of the calling process.

	      The calling process does not have sufficient privileges.

SEE ALSO

       exec(2), fork(2), getpid(2), getsid(2), kill(2), setpgrp3(2), setsid(2), privileges(5), <unistd.h>.

STANDARDS CONFORMANCE

																	setpgrp(2)