larn/signal.c

   1 /*      $NetBSD: signal.c,v 1.6 1997/10/18 20:03:50 christos Exp $      */
   2
   3 /* "Larn is copyrighted 1986 by Noah Morgan.\n" */
   4
   5 #include <sys/cdefs.h>
   6 #ifndef lint
   7 __RCSID("$NetBSD: signal.c,v 1.6 1997/10/18 20:03:50 christos Exp $");
   8 #endif  /* not lint */
   9
  10 #include <stdio.h>
  11 #include <signal.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include "header.h"
  15 #include "extern.h"
  16
  17 static void s2choose __P((void));
  18 static void cntlc __P((int));
  19 static void sgam __P((int));
  20 static void tstop __P((int));
  21 static void sigpanic __P((int));
  22
  23 #define BIT(a) (1<<((a)-1))
  24
  25 static void
  26 s2choose()
  27 {                               /* text to be displayed if ^C during intro
  28                                  * screen */
  29         cursor(1, 24);
  30         lprcat("Press ");
  31         setbold();
  32         lprcat("return");
  33         resetbold();
  34         lprcat(" to continue: ");
  35         lflush();
  36 }
  37
  38 static void
  39 cntlc(n)
  40         int n;
  41 {                               /* what to do for a ^C */
  42         if (nosignal)
  43                 return;         /* don't do anything if inhibited */
  44         signal(SIGQUIT, SIG_IGN);
  45         signal(SIGINT, SIG_IGN);
  46         quit();
  47         if (predostuff == 1)
  48                 s2choose();
  49         else
  50                 showplayer();
  51         lflush();
  52         signal(SIGQUIT, cntlc);
  53         signal(SIGINT, cntlc);
  54 }
  55
  56 /*
  57  *      subroutine to save the game if a hangup signal
  58  */
  59 static void
  60 sgam(n)
  61         int n;
  62 {
  63         savegame(savefilename);
  64         wizard = 1;
  65         died(-257);             /* hangup signal */
  66 }
  67
  68 #ifdef SIGTSTP
  69 static void
  70 tstop(n)
  71         int n;
  72 {                               /* control Y     */
  73         if (nosignal)
  74                 return;         /* nothing if inhibited */
  75         lcreat((char *) 0);
  76         clearvt100();
  77         lflush();
  78         signal(SIGTSTP, SIG_DFL);
  79 #ifdef SIGVTALRM
  80         /*
  81          * looks like BSD4.2 or higher - must clr mask for signal to take
  82          * effect
  83          */
  84         sigsetmask(sigblock(0) & ~BIT(SIGTSTP));
  85 #endif
  86         kill(getpid(), SIGTSTP);
  87
  88         setupvt100();
  89         signal(SIGTSTP, tstop);
  90         if (predostuff == 1)
  91                 s2choose();
  92         else
  93                 drawscreen();
  94         showplayer();
  95         lflush();
  96 }
  97 #endif  /* SIGTSTP */
  98
  99 /*
 100  *      subroutine to issue the needed signal traps  called from main()
 101  */
 102 void
 103 sigsetup()
 104 {
 105         signal(SIGQUIT, cntlc);
 106         signal(SIGINT, cntlc);
 107         signal(SIGKILL, SIG_IGN);
 108         signal(SIGHUP, sgam);
 109         signal(SIGILL, sigpanic);
 110         signal(SIGTRAP, sigpanic);
 111         signal(SIGIOT, sigpanic);
 112         signal(SIGEMT, sigpanic);
 113         signal(SIGFPE, sigpanic);
 114         signal(SIGBUS, sigpanic);
 115         signal(SIGSEGV, sigpanic);
 116         signal(SIGSYS, sigpanic);
 117         signal(SIGPIPE, sigpanic);
 118         signal(SIGTERM, sigpanic);
 119 #ifdef SIGTSTP
 120         signal(SIGTSTP, tstop);
 121         signal(SIGSTOP, tstop);
 122 #endif  /* SIGTSTP */
 123 }
 124
 125 /*
 126  *      routine to process a fatal error signal
 127  */
 128 static void
 129 sigpanic(sig)
 130         int             sig;
 131 {
 132         char            buf[128];
 133         signal(sig, SIG_DFL);
 134         sprintf(buf, "\nLarn - Panic! Signal %d received [SIG%s]", sig, sys_signame[sig]);
 135         write(2, buf, strlen(buf));
 136         sleep(2);
 137         sncbr();
 138         savegame(savefilename);
 139         kill(getpid(), sig);    /* this will terminate us */
 140 }