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clean up used processes

Posted by jaymzter (jaymzter), 13 February 2008
I'm calling ssh from within an Expect package I've written. The calling program calls it as such:



Code:
# -----------------------------------------------------
# load packages
# -----------------------------------------------------
lappend ::auto_path $home/expect.sc
package require cmasg

# -----------------------------------------------------
# main program
# -----------------------------------------------------
set resp [pkgname $1 $2 $3 $4]
send_user $resp


Here's the main guts of the package cmasg:

Code:
proc procname {1 2 3 4} {
spawn -noecho ssh remotehost

... run a command on the host

while 1 {
       expect {

... error checking on command's response

               -re "0m " {
               regexp {\n([[:digit:]]{3}-[[:digit:]]{4})} $expect_out(buffer) response
               return [string trimleft $response]
               break
               }
       }
}

send -- "exit\r"
expect -re "0m "
send -- "exit\r"
}


Everything works great, but I've noticed the local ssh session never dies. After a while I run out of resources (this is a Cygwin environment).

In the package I tried to set a variable PID to the ssh spawn process and then kill that PID at the end of the "while", but that didn't work

Posted by jaymzter (jaymzter), 13 February 2008
sorry about that, when I hit "Preview", it gets posted for some reason.

Also, everything does exit properly, except the initial ssh process spawned from the cmasg package

Posted by jaymzter (jaymzter), 13 February 2008
thanks to what I learned on this site I figured it out. I had to move any exit commands and anything else above the "return" call in the package.

Code:
              }
               -re "0m " {
               regexp {\n([[:digit:]]{3}-[[:digit:]]{4})} $expect_out(buffer) response
               send -- "exit\r"
               expect -re "0m "
               send -- "exit\r"
               return [string trimleft $response]
               }




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