games/larn/signal.c

   1 /*
   2  * $DragonFly: src/games/larn/signal.c,v 1.4 2006/08/26 17:05:05 pavalos Exp $
   3  */
   4
   5 #include <signal.h>
   6 #include "header.h"                     /* "Larn is copyrighted 1986 by Noah Morgan.\n" */
   7 #define BIT(a) (1<<((a)-1))
   8
   9 static void     s2choose(void);
  10 static void     cntlc(void);
  11 static void     sgam(void);
  12 #ifdef SIGTSTP
  13 static void     tstop(void);
  14 #endif
  15 static void     sigill(void);
  16 static void     sigtrap(void);
  17 static void     sigiot(void);
  18 static void     sigemt(void);
  19 static void     sigfpe(void);
  20 static void     sigbus(void);
  21 static void     sigsegv(void);
  22 static void     sigsys(void);
  23 static void     sigpipe(void);
  24 static void     sigterm(void);
  25 static void     sigpanic(int);
  26
  27 static void
  28 s2choose(void)  /* text to be displayed if ^C during intro screen */
  29         {
  30         cursor(1,24); lprcat("Press "); setbold(); lprcat("return"); resetbold();
  31         lprcat(" to continue: ");   lflush();
  32         }
  33
  34 static void
  35 cntlc(void)     /* what to do for a ^C */
  36         {
  37         if (nosignal) return;   /* don't do anything if inhibited */
  38         signal(SIGQUIT,SIG_IGN);        signal(SIGINT,SIG_IGN);
  39         quit(); if (predostuff==1) s2choose(); else showplayer();
  40         lflush();
  41         signal(SIGQUIT,(sig_t)cntlc);   signal(SIGINT,(sig_t)cntlc);
  42         }
  43
  44 /*
  45  *      subroutine to save the game if a hangup signal
  46  */
  47 static void
  48 sgam(void)
  49         {
  50         savegame(savefilename);  wizard=1;  died(-257); /* hangup signal */
  51         }
  52
  53 #ifdef SIGTSTP
  54 static void
  55 tstop(void) /* control Y        */
  56         {
  57         if (nosignal)   return;  /* nothing if inhibited */
  58         lcreat(NULL);  clearvt100();    lflush();         signal(SIGTSTP,SIG_DFL);
  59 #ifdef SIGVTALRM
  60         /* looks like BSD4.2 or higher - must clr mask for signal to take effect*/
  61         sigsetmask(sigblock(0)& ~BIT(SIGTSTP));
  62 #endif
  63         kill(getpid(),SIGTSTP);
  64
  65         setupvt100();  signal(SIGTSTP,(sig_t)tstop);
  66         if (predostuff==1) s2choose(); else drawscreen();
  67         showplayer();   lflush();
  68         }
  69 #endif /* SIGTSTP */
  70
  71 /*
  72  *      subroutine to issue the needed signal traps  called from main()
  73  */
  74 static void
  75 sigill(void)
  76         { sigpanic(SIGILL); }
  77
  78 static void
  79 sigtrap(void)
  80         { sigpanic(SIGTRAP); }
  81
  82 static void
  83 sigiot(void)
  84         { sigpanic(SIGIOT); }
  85
  86 static void
  87 sigemt(void)
  88         { sigpanic(SIGEMT); }
  89
  90 static void
  91 sigfpe(void)
  92         { sigpanic(SIGFPE); }
  93
  94 static void
  95 sigbus(void)
  96         { sigpanic(SIGBUS); }
  97
  98 static void
  99 sigsegv(void)
 100         { sigpanic(SIGSEGV); }
 101
 102 static void
 103 sigsys(void)
 104         { sigpanic(SIGSYS); }
 105
 106 static void
 107 sigpipe(void)
 108         { sigpanic(SIGPIPE); }
 109
 110 static void
 111 sigterm(void)
 112         { sigpanic(SIGTERM); }
 113
 114 void
 115 sigsetup(void)
 116         {
 117         signal(SIGQUIT, (sig_t)cntlc);          signal(SIGINT,  (sig_t)cntlc);
 118         signal(SIGKILL, SIG_IGN);               signal(SIGHUP,  (sig_t)sgam);
 119         signal(SIGILL,  (sig_t)sigill);         signal(SIGTRAP, (sig_t)sigtrap);
 120         signal(SIGIOT,  (sig_t)sigiot);         signal(SIGEMT,  (sig_t)sigemt);
 121         signal(SIGFPE,  (sig_t)sigfpe);         signal(SIGBUS,  (sig_t)sigbus);
 122         signal(SIGSEGV, (sig_t)sigsegv);        signal(SIGSYS,  (sig_t)sigsys);
 123         signal(SIGPIPE, (sig_t)sigpipe);        signal(SIGTERM, (sig_t)sigterm);
 124 #ifdef SIGTSTP
 125         signal(SIGTSTP, (sig_t)tstop);          signal(SIGSTOP, (sig_t)tstop);
 126 #endif /* SIGTSTP */
 127         }
 128
 129 static const char *signame[NSIG] = { "",
 130 "SIGHUP",  /*   1        hangup */
 131 "SIGINT",  /*   2        interrupt */
 132 "SIGQUIT", /*   3        quit */
 133 "SIGILL",  /*   4        illegal instruction (not reset when caught) */
 134 "SIGTRAP", /*   5        trace trap (not reset when caught) */
 135 "SIGIOT",  /*   6        IOT instruction */
 136 "SIGEMT",  /*   7        EMT instruction */
 137 "SIGFPE",  /*   8        floating point exception */
 138 "SIGKILL", /*   9        kill (cannot be caught or ignored) */
 139 "SIGBUS",  /*   10       bus error */
 140 "SIGSEGV", /*   11       segmentation violation */
 141 "SIGSYS",  /*   12       bad argument to system call */
 142 "SIGPIPE", /*   13       write on a pipe with no one to read it */
 143 "SIGALRM", /*   14       alarm clock */
 144 "SIGTERM", /*   15       software termination signal from kill */
 145 "SIGURG",  /*   16       urgent condition on IO channel */
 146 "SIGSTOP", /*   17       sendable stop signal not from tty */
 147 "SIGTSTP", /*   18       stop signal from tty */
 148 "SIGCONT", /*   19       continue a stopped process */
 149 "SIGCHLD", /*   20       to parent on child stop or exit */
 150 "SIGTTIN", /*   21       to readers pgrp upon background tty read */
 151 "SIGTTOU", /*   22       like TTIN for output if (tp->t_local&LTOSTOP) */
 152 "SIGIO",   /*   23       input/output possible signal */
 153 "SIGXCPU", /*   24       exceeded CPU time limit */
 154 "SIGXFSZ", /*   25       exceeded file size limit */
 155 "SIGVTALRM",/*  26       virtual time alarm */
 156 "SIGPROF", /*   27       profiling time alarm */
 157 "SIGWINCH",/*   28       window size changes */
 158 "SIGINFO",/*    29       information request */
 159 "SIGUSR1",/*    30       user defined signal 1 */
 160 "SIGUSR2",/*    31       user defined signal 2 */
 161 };
 162
 163 /*
 164  *      routine to process a fatal error signal
 165  */
 166 static void
 167 sigpanic(int sig)
 168         {
 169         char buf[128];
 170         signal(sig,SIG_DFL);
 171         sprintf(buf,"\nLarn - Panic! Signal %d received [%s]",sig,signame[sig]);
 172         write(2,buf,strlen(buf));  sleep(2);
 173         sncbr();
 174         savegame(savefilename);
 175         kill(getpid(),sig); /* this will terminate us */
 176         }