SIGINT generated by Control-C, is not delivered in mintty
Houder
houder@xs4all.nl
Sun Jul 19 12:56:00 GMT 2015
> I have a suspicion that the problem he is facing could be the same I
> described in
>
> https://sourceware.org/ml/cygwin/2015-02/msg00122.html
> where the issue only occurs if mintty is started from the cygwin
> console.
Sorry to interfere here, Thomas, but I had a hard time with your
description ... It seems to me, that SIGINT
is ignored if mintty is to interact with the "dos console" ...
Henri
Experiment:
1. mintty interacting with a "dos console" (SIGINT is ignored)
call flow:
cmd
bash
mintty ... a new window opens, where mintty/bash is NOT responsive
to SIGINT (mintty interacts with cons)
exec mintty ... (child process ... ?) ... another window opens,
where mintty/bash is responsive to SIGINT
(here mintty interacts with pty)
[ i.e. simular to starting bash from within a dos concole, followed by
the invocation of mintty ... ]
2. mintty NOT interacting with a "dos console"
call flow:
cmd
mintty ... a new window opens, where mintty/bash is responsive to
SIGINT (mintty w/o controlling terminal?)
exec mintty (child process ... ?) ... another window opens, where
mintty/bash is responsive to SIGINT [1]
(here mintty interacts with pty)
[ i.e. simular to starting mintty from within a dos concole ... ]
[1] exec mintty is invoked here only as an additional experiment (i.e.
it is not required)
----- detailed ...
1. mintty interacting with a "dos console" (SIGINT is ignored)
[ starting bash from within a dos concole, followed by the invocation of
mintty ... ]
PATH (64) = /usr/local/bin:/usr/bin:/drv/c/...
Executing .bash_profile
Executing .bashrc, $- = himBH, login_shell on
64-@@ uname -a
CYGWIN_NT-6.1 Seven 2.0.4(0.287/5/3) 2015-06-09 12:22 x86_64 Cygwin
64-@@ ps ax
PID PPID PGID WINPID TTY UID STIME COMMAND
5064 4500 5064 5040 cons0 1000 13:30:55 /usr/bin/ps
4500 1 4500 4500 cons0 1000 13:30:48
/usr/bin/bash
64-@@ mintty
... a new window opens
PATH (64) =
/usr/local/bin:/usr/bin:/drv/c/WINDOWS/system32:/drv/c/WINDOWS:/drv/c/WINDOWS/System32/Wbem:/home/Henri/bin
Executing .bashrc, $- = himBH, login_shell off
64-@@ ps ax
PID PPID PGID WINPID TTY UID STIME COMMAND
3768 1260 3768 1132 pty0 1000 13:33:27 /usr/bin/ps
4500 1 4500 4500 cons0 1000 13:30:48
/usr/bin/bash
1260 1468 1260 2088 pty0 1000 13:33:21
/usr/bin/bash
1468 4500 1468 2192 cons0 1000 13:33:21
/usr/bin/mintty <==== tty == cons
64-@@ <==== NOT responsive to SIGINT
64-@@ exec mintty
... another window opens
PATH (64) =
/usr/local/bin:/usr/bin:/drv/c/WINDOWS/system32:/drv/c/WINDOWS:/drv/c/WINDOWS/System32/Wbem:/home/Henri/bin
Executing .bashrc, $- = himBH, login_shell off
64-@@ ps ax
PID PPID PGID WINPID TTY UID STIME COMMAND
4284 4592 4284 3032 pty1 1000 13:35:18 /usr/bin/ps
4592 1260 4592 4052 pty1 1000 13:35:03
/usr/bin/bash
4500 1 4500 4500 cons0 1000 13:30:48
/usr/bin/bash
1468 4500 1468 2192 cons0 1000 13:33:21
/usr/bin/mintty
1260 1468 1260 4496 pty0 1000 13:33:21
/usr/bin/mintty <==== tty != cons
64-@@ ^C responsive to SIGINT
64-@@
2. mintty NOT interacting with a "dos console"
[ starting mintty from within a dos concole ... ]
PATH (64) = /usr/local/bin:/usr/bin:/drv/c/...
Executing .bash_profile
Executing .bashrc, $- = himBH, login_shell on
64-@@ ps ax
PID PPID PGID WINPID TTY UID STIME COMMAND
4344 1448 4344 4044 pty0 1000 13:40:58
/usr/bin/bash
2144 4344 2144 4308 pty0 1000 13:41:11 /usr/bin/ps
1448 1 1448 1448 ? 1000 13:40:58
/usr/bin/mintty <==== tty != cons
64-@@ ^C responsive to SIGINT
64-@@
----- same experiment, but as an intermediate step: first start cmd from
dos console ...
1. mintty interacting with a "dos console" (SIGINT is ignored)
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
64-C:\Users\Henri> e:/Cygwin64/bin/bash
PATH (64) = /drv/c/...
Executing .bashrc, $- = himBH, login_shell off
64-@@ ps ax
PID PPID PGID WINPID TTY UID STIME COMMAND
4884 784 4884 4868 cons0 1000 12:28:23 /usr/bin/ps
784 1 784 784 cons0 1000 12:27:49
/usr/bin/bash
64-@@ mintty
... a new window opens
64-@@ ps ax
PID PPID PGID WINPID TTY UID STIME COMMAND
1132 3548 1132 948 pty0 1000 12:29:43
/usr/bin/bash
3548 784 3548 4052 cons0 1000 12:29:43
/usr/bin/mintty <==== tty == cons
784 1 784 784 cons0 1000 12:27:49
/usr/bin/bash
2272 1132 2272 812 pty0 1000 12:29:48 /usr/bin/ps
64-@@ <==== NOT responsive to SIGINT ...
64-@@ exec mintty
... another window opens
64-@@ ps ax
PID PPID PGID WINPID TTY UID STIME COMMAND
4984 4788 4984 3396 pty1 1000 12:34:33 /usr/bin/ps
2712 4768 2712 2172 pty0 1000 12:34:05
/usr/bin/mintty <==== tty != cons
4768 784 4768 1704 cons0 1000 12:34:05
/usr/bin/mintty
4788 2712 4788 2856 pty1 1000 12:34:22
/usr/bin/bash
784 1 784 784 cons0 1000 12:27:49
/usr/bin/bash
64-@@ ^C <==== responsive to SIGINT ...
2. mintty NOT interacting with a "dos console"
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
64-C:\Users\Henri> e:/Cygwin64/bin/mintty
... a new window opens
64-@@ ps ax
PID PPID PGID WINPID TTY UID STIME COMMAND
3916 4736 3916 3968 pty0 1000 12:24:11
/usr/bin/bash
4736 1 4736 4736 ? 1000 12:24:10
/usr/bin/mintty <==== tty != cons
2568 3916 2568 2880 pty0 1000 12:24:17 /usr/bin/ps
64-@@ ^C <==== responsive to SIGINT ...
=====
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