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On 8/2/2012 12:32 PM, Marcin Kielar wrote:Steps to reproduce:This problem arises from Cygwin's use of CREATE_NEW_PROCESS_GROUP. From MSDN:
1. Start cygwin using cygwin.bat 2. Run `ping -t google.com` 3. Try breaking it with Ctrl+C
"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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