Mail Archives: cygwin-apps/2001/12/19/16:24:15
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Earnie.
Michael Rumpf wrote:
>
> Hi,
>
> I'm new to the list and I don't know if this problem is already solved, but
> I couldn't find a hint neither on the archives nor on the FAQ or somewhere
> else on the net.
>
> My problem is related to bash/cmd and signal handling.
> In my app I installed a signal handler for SIGINT. The app is going into a
> wait loop and waiting for the exit flag from the signal handler to be set.
>
> When pressing CTRL-C in the windows cmd shell the application continues
> normally after the signal handler has been caught. Under bash the signal
> handler is also correctly called, but after that the app is exiting
> immediatly, i.e. not continuing with the code.
> Here is the source:
>
> ////////////////////////////////////////////////////////////////////////////
> /////////////////
> #include <windows.h>
> #include <stdio.h>
> #include <signal.h>
>
> bool loop = true;
>
> extern "C" void signalHandler(int sig)
> {
> switch( sig )
> {
> case SIGINT: // == 2
> printf("SIGINT=%d\n",sig);
> break;
> default:
> printf("default=%d\n",sig);
> break;
> };
> loop=false;
> }
>
> int main(int argc, char* argv[])
> {
> if (signal( SIGINT , signalHandler ) == SIG_ERR)
> return -1;
> printf("### ctrlbreak: Waiting now...\n");
> while(loop)
> Sleep ((DWORD) 1000) ;
> printf("### ctrlbreak: Finished waiting now...\n");
> return 0;
> }
> ////////////////////////////////////////////////////////////////////////////
> /////////////////
>
> Here the the output of the app under Win2K/bash:
> // bash 2.05a-2
> $ ./ctrlbreak.exe
> ### ctrlbreak: Waiting now...
> SIGINT=2
>
> // GNU bash, version 2.02.1(2)-release (i586-pc-cygwin32) B20.1
> bash-2.02$ ./ctrlbreak
> ### ctrlbreak: Waiting now...
> SIGINT=2
>
> // cmd.exe Win2k SP2
> ### ctrlbreak: Waiting now...
> SIGINT=2
> ### ctrlbreak: Finished waiting now...
>
> You can see that under the cmd shell the text "Finished waiting now..." is
> printed which does not come out under the bash.
> Any hint would be greatly appreciated...
>
> Michael
>
> PS: I just downloaded the latest stable version 1.3.6 today...
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