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Full Discussion: An overall function as a restart...
Top Forums UNIX for Advanced & Expert Users An overall function as a restart... Post 302832191 by Don Cragun on Saturday 13th of July 2013 07:41:21 AM
Old 07-13-2013
If we assume that you have a shell script (AudioScope) and that you invoke it with a command line like:
Code:
AudioScope arg1 ... argn

and after running for a while it decides it needs to restart itself. One way to do that is to issue the command:
Code:
exec AudioScope "$@"

This will overlay the current shell script with a new invocation of the script without changing its process ID (i.e., $$ will not change). If the script has opened files and not closed them, they will remain open (so you'll need to close any files that aren't needed when you restart before calling exec). Exported variables will have the values they had before calling exec; local variables will disappear. If some of your options or operands have been processed and are not wanted in the restart, they can be shift'ed off before calling exec; but if you processed options using something like getopts and shifted them off, you'll need to be sure to add the needed options for the restart into the list of arguments given to the exec command. Note also that any buffered data in files that do remain open may be lost in by exec.

But, you can do this all day without overflowing your stack.
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT FREEBSD

gdm-restart

gdm-restart(1m) 						   User Commands						   gdm-restart(1m)

NAME

       gdm-restart, gdm-safe-restart, gdm-stop - stop or restart GDM

SYNOPSIS

       gdm-restart

       gdm-safe-restart

       gdm-stop

DESCRIPTION

       gdm-restart stops and restarts GDM by sending a HUP signal to the GDM daemon. This command immediately terminates all sessions and logs out
       users currently logged in with GDM.

       gdm-safe-restart stops and restarts GDM by sending a USR1 signal to the GDM daemon. GDM is restarted as soon as all users log out.

       gdm-stop stops GDM by sending a TERM signal to the GDM daemon.

FILES

       The following files are used by this application:

       /usr/bin/gdm-restart    Executable to stop and restart GDM

       /usr/bin/gdm-safe-restarExecutable to stop and restart GDM safely

       /usr/bin/stop	       Executable to stop GDM

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-display-mgr	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Latest version of the GNOME Desktop User Guide for your platform.

       gdm(1), gdmXnestchooser(1), gdmflexiserver(1), gdmphotosetup(1), gdmsetup(1), gdmthemetester(1), gdmconfig(1m)

NOTES

       Written by Brian Cameron, Sun Microsystems Inc., 2004.

SunOS 5.10							    1 Sep 2004							   gdm-restart(1m)
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