How to get exit code of spawned process?

[Dmm]

For example, we we ssh to run some commands remotely, and they fails with exit code 22 and with no stdout/stderr:

spawn -noecho ssh -C "$user@$host" $cmds
expect {
    -re ".*es.*o.*" {
        exp_send "yes\r"
        exp_continue
    }
    -re ".*sword.*" {
        exp_send "$password\r"
    }
}
interact
# ??? How to get ssh exit code here ???

Thanks!

[Dmm]

s/we we ssh/we use ssh/

[ender]

If the problem is that spawning ssh fails then you can catch errors from spawn like this

if [catch "spawn ssh" reason] {
send_user "failed to spawn program: $reason\n"
exit 1
}

That is from the book exploring expect.

If it is actually spawning ssh properly and then ssh runs but can't connect or something else, then try expecting the error message.

[Dmm]

There is no error message, ssh can silently die with non-null exit code. There also is another problem with running remote process via spawn. If I use catch+wait, expect hangs in 10-15 seconds and is not able to finish, even with Ctrl+C. I able to see spawned in ps aux, it runs and exiits successfully, but expect is completely hanged up.

[ender]

Can you expect eof and deal with it that way?

[ender]

From looking in the book again there is a sample script that gets the exit value by spawning a shell and then running the command you need the value from. It uses the shells command to get the exit value, $? or $status in the script.

[SpiderErrol]

This is probably 3 years too late for you, but might help someone searching with a similar problem. After the "interact", add the following code:

# This will wait for ssh to exit (if it hasn't already), and capture it's exit value.
set waitval [wait -i $spawn_id]
set exval [lindex $waitval 3]
# $exval contains the value from ssh, so do something interesting with it or just return it to your own caller:
exit $exval

This was tested with expect version 5.45