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From: tribby@cup.hp.com (Dave Tribby)
Subject: Re: using signals
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Date: Tue, 19 Apr 1994 18:52:20 GMT
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Jason Perez (j0p7771@tam2000.tamu.edu) wrote:
>   how does one use signals in gno?  


Here's some code from synthfile.c, version 1.5...

....
#include <GNO/gno.h>
#include <signal.h>
....

#pragma databank 1

/*----------------------------------------------------------------------*/
/*	       ===== GNO Signal handler routine ===== 			*/
/*----------------------------------------------------------------------*/

void SigHandler(int sig, int code)
{
switch (sig) {

   case SIGINT:
   /* User keyboard interrupt: Stop playing/printing current song */
      if (playing)
         StopSong();
      printing = FALSE;
      break;

   case SIGUSR1:
   /* User-defined signal 1: print name of current file on stderr */
      if (current_file)
         fprintf(stderr, " SynthFile: %s\n", current_file);
      break;

   case SIGHUP:
   case SIGTERM:
   /* Kill or hang-up: Stop playing, clean up, and terminate */
      if (playing)
         StopSong();
      if (play)   {
         MSShutDown();
         SoundShutDown();
         DisposeHandle(sound_zero_page);
         }
      exit(1);
   }
}
#pragma databank 0
....
      fprintf(stderr,"SynthFile handles the following GNO signals:\n");
      fprintf(stderr,
"   kill -1  or  kill -15: shutdown tools and terminate program\n");
      fprintf(stderr,
"   kill -2  or interrupt key (^C): stop playing/printing a sequence file\n");
      fprintf(stderr,
"   kill -30: print name of current file on standard error\n");
      }                                                                        
....
   /* Install the GNO signal handlers */
   signal(SIGINT,  SigHandler);
   signal(SIGTERM, SigHandler);
   signal(SIGHUP,  SigHandler);
   signal(SIGUSR1, SigHandler);
....

Hope this makes sense to you!

-- Dave Tribby
   (tribby@cup.hp.com)