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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 SUNOS

restart

asadmin-hadbm-restart(1ASS)					   User Commands				       asadmin-hadbm-restart(1ASS)

NAME

       asadmin-hadbm-restart, hadbm-restart, restart - restarts the database

SYNOPSIS

       restart [--no-rolling] [database_name]

       Use  the  restart command to restart the database. Once the database is restarted, the database should return to the previous state. If the
       database name is specified, the database should exist. If a database is not identified, the default  database  is  restarted.  The  default
       database is hadb.

       In interactive mode, the restart command prompts for a confirmation before restarting the database.

OPTIONS

       -g --no-rolling	       restarts all nodes in HADB at once with possible loss of service.

OPERANDS

       database_name	       name of the database. The default database is hadb.

       Example 1: Using restart with a database identified

       hadbm> restart --rolling mydatabase
       This command will restart the named database.
       Type "yes" or "y" to confirm this operation,
       anything else to cancel:y
       Database successfully restarted

EXIT STATUS

       105		       database is not running

       106		       database could not be restarted

       107		       database could not return to a previous state

       asadmin-hadbm-status(1ASS),    asadmin-hadbm-nodestatus(1ASS),	asadmin-hadbm-list(1ASS),   asadmin-hadbm-addnodes(1ASS),   asadmin-hadbm-
       clear(1ASS), asadmin-hadbm-refragment(1ASS), asadmin-hadbm-delete(1ASS), asadmin-hadbm-start(1ASS), asadmin-hadbm-stop(1ASS)

Sun ONE Application Server 7 Enterprise Edition Early Access	   7 March 2003 				       asadmin-hadbm-restart(1ASS)
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