larn/signal.c

   1 #ifndef lint
   2 static char rcsid[] = "$NetBSD: signal.c,v 1.5 1995/12/21 11:27:51 mycroft Exp $";
   3 #endif /* not lint */
   4
   5 #include <signal.h>
   6 #include "header.h"                     /* "Larn is copyrighted 1986 by Noah Morgan.\n" */
   7 #include <string.h>
   8
   9 #define BIT(a) (1<<((a)-1))
  10 extern char savefilename[],wizard,predostuff,nosignal;
  11 static s2choose()       /* text to be displayed if ^C during intro screen */
  12         {
  13         cursor(1,24); lprcat("Press "); setbold(); lprcat("return"); resetbold();
  14         lprcat(" to continue: ");   lflush();
  15         }
  16
  17 static void
  18 cntlc() /* what to do for a ^C */
  19         {
  20         if (nosignal) return;   /* don't do anything if inhibited */
  21         signal(SIGQUIT,SIG_IGN);        signal(SIGINT,SIG_IGN);
  22         quit(); if (predostuff==1) s2choose(); else showplayer();
  23         lflush();
  24         signal(SIGQUIT,cntlc);  signal(SIGINT,cntlc);
  25         }
  26
  27 /*
  28  *      subroutine to save the game if a hangup signal
  29  */
  30 static void
  31 sgam()
  32         {
  33         savegame(savefilename);  wizard=1;  died(-257); /* hangup signal */
  34         }
  35
  36 #ifdef SIGTSTP
  37 static void
  38 tstop() /* control Y    */
  39         {
  40         if (nosignal)   return;  /* nothing if inhibited */
  41         lcreat((char*)0);  clearvt100();        lflush();         signal(SIGTSTP,SIG_DFL);
  42 #ifdef SIGVTALRM
  43         /* looks like BSD4.2 or higher - must clr mask for signal to take effect*/
  44         sigsetmask(sigblock(0)& ~BIT(SIGTSTP));
  45 #endif
  46         kill(getpid(),SIGTSTP);
  47
  48         setupvt100();  signal(SIGTSTP,tstop);
  49         if (predostuff==1) s2choose(); else drawscreen();
  50         showplayer();   lflush();
  51         }
  52 #endif SIGTSTP
  53
  54 /*
  55  *      subroutine to issue the needed signal traps  called from main()
  56  */
  57 static void sigpanic();
  58 sigsetup()
  59         {
  60         signal(SIGQUIT, cntlc);                 signal(SIGINT,  cntlc);
  61         signal(SIGKILL, SIG_IGN);               signal(SIGHUP,  sgam);
  62         signal(SIGILL,  sigpanic);              signal(SIGTRAP, sigpanic);
  63         signal(SIGIOT,  sigpanic);              signal(SIGEMT,  sigpanic);
  64         signal(SIGFPE,  sigpanic);              signal(SIGBUS,  sigpanic);
  65         signal(SIGSEGV, sigpanic);              signal(SIGSYS,  sigpanic);
  66         signal(SIGPIPE, sigpanic);              signal(SIGTERM, sigpanic);
  67 #ifdef SIGTSTP
  68         signal(SIGTSTP,tstop);          signal(SIGSTOP,tstop);
  69 #endif SIGTSTP
  70         }
  71
  72 /*
  73  *      routine to process a fatal error signal
  74  */
  75 static void
  76 sigpanic(sig)
  77         int sig;
  78         {
  79         char buf[128];
  80         signal(sig,SIG_DFL);
  81         sprintf(buf,"\nLarn - Panic! Signal %d received [SIG%s]",sig,sys_signame[sig]);
  82         write(2,buf,strlen(buf));  sleep(2);
  83         sncbr();
  84         savegame(savefilename);
  85         kill(getpid(),sig); /* this will terminate us */
  86         }