Closing the Command Prompt using the "x" button doesn't update shell history file

[Andy Koppe]

On Thu, 24 Mar 2022, 08:34 Takashi Yano wrote:
> On Wed, 23 Mar 2022 15:11:20 -0400 Mitchell Hentges wrote:
> > To reproduce the issue:
> > 1. Run Cygwin.bat to open a Cygwin shell in the "Command Prompt" terminal
> > 2. Run some command, such as "echo test"
> > 3. Click the Windows "x" button in the top-right corner of the terminal
> >
> > The terminal closes, but `$HOME/.bash_history` is not updated to include
> > the "echo test" command.
> > Interestingly, when using mintty, the shell history is indeed saved when
> > the "x" button is pressed.
>
> I looked into this problem, and found cygwin sends SIGHUP on
> window closure, however, bash is terminated before SIGHUP is
> processed.
>
> The following patch solves the issue, however, I wonder if
> there is better way to wait completion of signal handling.
>
> diff --git a/winsup/cygwin/exceptions.cc b/winsup/cygwin/exceptions.cc
> index f946bed77..87b419ea7 100644
> --- a/winsup/cygwin/exceptions.cc
> +++ b/winsup/cygwin/exceptions.cc
> @@ -1119,6 +1119,7 @@ ctrl_c_handler (DWORD type)
>         {
>           sig_send (NULL, SIGHUP);
>           saw_close = true;
> +         Sleep (100);
>           return FALSE;
>         }
>        if (!saw_close && type == CTRL_LOGOFF_EVENT)

Rather than have a timeout, how about just sending SIGHUP first time
around, on the assumption that the shell will usually quit on that. If
it doesn't, a second click on the close button could kill it more
forcefully.

Andy