Re: application crash during WINCH Signal

I hope this information additional information helps to solve the problem:

I commented the code like this.

$SIG{'WINCH'} = sub {
#    if (!$CONNECTED) {
#        return 1;
#    }
#    while (! $EXP -> slave) {
#        select(undef, undef, undef, 0.25);
#    };
#    $EXP -> slave -> clone_winsize_from(\*STDIN);
    kill WINCH => $EXP -> pid if $EXP -> pid;
};
[download]

Then, followed the next steps

Open e local bash terminal
type : trap 'stty size' winch <enter>
Type enter, enter, enter, ... until I arrive to the last line
Then the terminal fills with:

test@test-VirtualBox:~$trap 'stty size' winch
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85
test@test-VirtualBox:~$ 24 85

 <-= DISCONNECTED (PRESS <ENTER> TO RECONNECT) (Thu Nov 28 13:14:40 20
+19)
[download]

And then stops

Looks like it enters into an infinite loop. This behaviour is not seen in any other desktop, environment.

In other desktop environments you see:

hans@hans-desktop:~$ trap 'stty size' winch
hans@hans-desktop:~$ 
hans@hans-desktop:~$ 
hans@hans-desktop:~$ 
hans@hans-desktop:~$ 
hans@hans-desktop:~$ 
hans@hans-desktop:~$
[download]

The winch signal is never called when you arrive to the end, only on a window resize.

It would be help full for me to see if I understand the code correctly

$SIG{'WINCH'} = sub {
    kill WINCH => $EXP -> pid if $EXP -> pid;
};
[download]

The kill line, what it does is stop the WINCH event from being called again be the same event, right?

Could it be that in xubuntu is not being sent and then the signal keeps arriving until there is a stack overflow or something similar?

Comment on Re: application crash during WINCH Signal Select or Download Code

Replies are listed 'Best First'.
Re^2: application crash during WINCH Signal by bliako (Monsignor) on Nov 28, 2019 at 20:53 UTC
The kill line, what it does is stop the WINCH event from being called again be the same event, right? `kill WINCH => $EXP -> pid if $EXP -> pid;` sends the WINCH signal to the process with pid `$EXP->pid`. Where `$EXP` is an Expect object (i guess). The bottom line is that `kill` is sending a specified signal to a specified process. It does not stop or block a signal.	[reply] [d/l] [select]


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