pfSense

I found a problem with trap mechanism in /etc/rc.initial that does not trap CTRL-C back to ssh/cli console menu.
Instead it ends up in # prompt. If I then do exit, it goes back to menu as it should.

I could see that the existing /etc/rc.initial has the trap 2 , 3 and 4 commented.

# make sure the user can't kill us by pressing Ctrl-C,
# ctrl-z, etc.
#trap : 2
#trap : 3
@#trap : 4

I tried to uncomment "trap 2" (which is CTRL-C) and then it worked as it should. Whenever I do CTRL-C it always return to the ssh/cli console menu.

I also had a look in the repository for the /etc/rc.initial and found a commit:
Scott Ullrich committed on 2 Mar 2007
ctrl-c is handy in the shell. Do not lock out.
RELENG_1_2_RELEASE

-trap : 2
-trap : 3
-trap : 4
+#trap : 2
+#trap : 3
+#trap : 4


and

Scott Ullrich committed on 19 Jun 2005
Misc comments
RELENG_1_2_RELEASE

-# make sure the user can't kill us by pressing Ctrl-C
+# make sure the user can't kill us by pressing Ctrl-C,
+# ctrl-z, etc.


However, I think this is not entirely true as what I found when testing was that with "trap 2" enabled
the CTRL-C does work but the difference is that you will get back to console menu instead of # prompt.

As console menu has a menu "8 Shell" it is possible to get to pure shell even from console menu
so the CTRL-C inside functions like "Filter Logs" will let the user get back to console menu instead of # prompt.

I am not sure though if the "trap 2" will break anything if executed from non Serial / Ssh console.

Best regards
Dan Lundqvist
Stockholm, Sweden