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Re: Ctrl+C not working with windows programs in Cygwin 1.7.16


On 08/02/2012 04:26 PM, Daniel Colascione wrote:
On 8/2/2012 12:32 PM, Marcin Kielar wrote:
Steps to reproduce:

1. Start cygwin using cygwin.bat
2. Run `ping -t google.com`
3. Try breaking it with Ctrl+C
This problem arises from Cygwin's use of CREATE_NEW_PROCESS_GROUP. From MSDN:

"When a process is created with CREATE_NEW_PROCESS_GROUP specified, an implicit
call to SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process;
this means that the new process has CTRL+C disabled. This lets shells handle
CTRL+C themselves, and selectively pass that signal on to sub-processes.
CTRL+BREAK is not disabled, and may be used to interrupt the process/process group."

SetConsoleCtrlHandler(NULL,TRUE) tells a process and all its children to ignore
control-C. This problem only affects programs run in a console --- in a pty,
Cygwin just terminates Windows processes in response to SIGINT.

This may be true but it is a recent development.
From the similar thread that specifies a java process my remarks:

This is still a problem.
CYGWIN_NT-6.1 rwells-w7 1.7.16(0.262/5/3) 2012-07-20 22:55 i686 Cygwin

We have been developing CLI applications for close to 20 years and have never had a
problem with the cygwin bash shell failing to pass Ctrl-C signals to the application until now.
Luckily the cmd.exe still does.


Let me know if it something that I can help track down. Glad to help if possible.


-- Roger Wells, P.E. SAIC 221 Third St Newport, RI 02840 401-847-4210 (voice) 401-849-1585 (fax) roger.k.wells@saic.com


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