SIGINT generated by Control-C, is not delivered in mintty

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年06月09日 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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