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

[Takashi Yano]

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)

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>