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signal.c revision 1.2 
      1 #ifndef lint
      2 static char rcsid[] = "$Id: signal.c,v 1.2 1993/08/02 17:20:21 mycroft Exp $";
      3 #endif /* not lint */
      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 extern char savefilename[],wizard,predostuff,nosignal;
      9 static s2choose()	/* text to be displayed if ^C during intro screen */
     10 	{
     11 	cursor(1,24); lprcat("Press "); setbold(); lprcat("return"); resetbold();
     12 	lprcat(" to continue: ");   lflush();
     13 	}
     14 
     15 static void
     16 cntlc()	/* what to do for a ^C */
     17 	{
     18 	if (nosignal) return;	/* don't do anything if inhibited */
     19 	signal(SIGQUIT,SIG_IGN);	signal(SIGINT,SIG_IGN);
     20 	quit(); if (predostuff==1) s2choose(); else showplayer();
     21 	lflush();
     22 	signal(SIGQUIT,cntlc);	signal(SIGINT,cntlc);
     23 	}
     24 
     25 /*
     26  *	subroutine to save the game if a hangup signal
     27  */
     28 static void
     29 sgam()
     30 	{
     31 	savegame(savefilename);  wizard=1;  died(-257); /* hangup signal */
     32 	}
     33 
     34 #ifdef SIGTSTP
     35 static void
     36 tstop() /* control Y	*/
     37 	{
     38 	if (nosignal)   return;  /* nothing if inhibited */
     39 	lcreat((char*)0);  clearvt100();	lflush();	  signal(SIGTSTP,SIG_DFL);
     40 #ifdef SIGVTALRM
     41 	/* looks like BSD4.2 or higher - must clr mask for signal to take effect*/
     42 	sigsetmask(sigblock(0)& ~BIT(SIGTSTP));
     43 #endif
     44 	kill(getpid(),SIGTSTP);
     45 
     46 	setupvt100();  signal(SIGTSTP,tstop);
     47 	if (predostuff==1) s2choose(); else drawscreen();
     48 	showplayer();	lflush();
     49 	}
     50 #endif SIGTSTP
     51 
     52 /*
     53  *	subroutine to issue the needed signal traps  called from main()
     54  */
     55 static void sigpanic();
     56 static void sigill()	{ sigpanic(SIGILL); }
     57 static void sigtrap()	{ sigpanic(SIGTRAP); }
     58 static void sigiot()	{ sigpanic(SIGIOT); }
     59 static void sigemt()	{ sigpanic(SIGEMT); }
     60 static void sigfpe()	{ sigpanic(SIGFPE); }
     61 static void sigbus()	{ sigpanic(SIGBUS); }
     62 static void sigsegv()	{ sigpanic(SIGSEGV); }
     63 static void sigsys()	{ sigpanic(SIGSYS); }
     64 static void sigpipe()	{ sigpanic(SIGPIPE); }
     65 static void sigterm()	{ sigpanic(SIGTERM); }
     66 sigsetup()
     67 	{
     68 	signal(SIGQUIT, cntlc); 		signal(SIGINT,  cntlc);
     69 	signal(SIGKILL, SIG_IGN);		signal(SIGHUP,  sgam);
     70 	signal(SIGILL,  sigill);		signal(SIGTRAP, sigtrap);
     71 	signal(SIGIOT,  sigiot);		signal(SIGEMT,  sigemt);
     72 	signal(SIGFPE,  sigfpe);		signal(SIGBUS,  sigbus);
     73 	signal(SIGSEGV, sigsegv);		signal(SIGSYS,  sigsys);
     74 	signal(SIGPIPE, sigpipe);		signal(SIGTERM, sigterm);
     75 #ifdef SIGTSTP
     76 	signal(SIGTSTP,tstop);		signal(SIGSTOP,tstop);
     77 #endif SIGTSTP
     78 	}
     79 
     80 #ifdef BSD	/* for BSD UNIX? */
     81 
     82 static char *signame[NSIG] = { "",
     83 "SIGHUP",  /*	1	 hangup */
     84 "SIGINT",  /*	2	 interrupt */
     85 "SIGQUIT", /*	3	 quit */
     86 "SIGILL",  /*	4	 illegal instruction (not reset when caught) */
     87 "SIGTRAP", /*	5	 trace trap (not reset when caught) */
     88 "SIGIOT",  /*	6	 IOT instruction */
     89 "SIGEMT",  /*	7	 EMT instruction */
     90 "SIGFPE",  /*	8	 floating point exception */
     91 "SIGKILL", /*	9	 kill (cannot be caught or ignored) */
     92 "SIGBUS",  /*	10	 bus error */
     93 "SIGSEGV", /*	11	 segmentation violation */
     94 "SIGSYS",  /*	12	 bad argument to system call */
     95 "SIGPIPE", /*	13	 write on a pipe with no one to read it */
     96 "SIGALRM", /*	14	 alarm clock */
     97 "SIGTERM", /*	15	 software termination signal from kill */
     98 "SIGURG",  /*	16	 urgent condition on IO channel */
     99 "SIGSTOP", /*	17	 sendable stop signal not from tty */
    100 "SIGTSTP", /*	18	 stop signal from tty */
    101 "SIGCONT", /*	19	 continue a stopped process */
    102 "SIGCHLD", /*	20	 to parent on child stop or exit */
    103 "SIGTTIN", /*	21	 to readers pgrp upon background tty read */
    104 "SIGTTOU", /*	22	 like TTIN for output if (tp->t_local&LTOSTOP) */
    105 "SIGIO",   /*	23	 input/output possible signal */
    106 "SIGXCPU", /*	24	 exceeded CPU time limit */
    107 "SIGXFSZ", /*	25	 exceeded file size limit */
    108 "SIGVTALRM",/*  26	 virtual time alarm */
    109 "SIGPROF", /*	27	 profiling time alarm */
    110 "","","","" };
    111 
    112 #else BSD	/* for system V? */
    113 
    114 static char *signame[NSIG] = { "",
    115 "SIGHUP",  /*	1	 hangup */
    116 "SIGINT",  /*	2	 interrupt */
    117 "SIGQUIT", /*	3	 quit */
    118 "SIGILL",  /*	4	 illegal instruction (not reset when caught) */
    119 "SIGTRAP", /*	5	 trace trap (not reset when caught) */
    120 "SIGIOT",  /*	6	 IOT instruction */
    121 "SIGEMT",  /*	7	 EMT instruction */
    122 "SIGFPE",  /*	8	 floating point exception */
    123 "SIGKILL", /*	9	 kill (cannot be caught or ignored) */
    124 "SIGBUS",  /*	10	 bus error */
    125 "SIGSEGV", /*	11	 segmentation violation */
    126 "SIGSYS",  /*	12	 bad argument to system call */
    127 "SIGPIPE", /*	13	 write on a pipe with no one to read it */
    128 "SIGALRM", /*	14	 alarm clock */
    129 "SIGTERM", /*	15	 software termination signal from kill */
    130 "SIGUSR1",  /*	16	 user defines signal 1 */
    131 "SIGUSR2", /*	17	 user defines signal 2 */
    132 "SIGCLD",  /*	18	 child death */
    133 "SIGPWR",  /*	19	 power fail */
    134 "","","","","","","","","","","","" };
    135 
    136 #endif BSD
    137 
    138 /*
    139  *	routine to process a fatal error signal
    140  */
    141 static void
    142 sigpanic(sig)
    143 	int sig;
    144 	{
    145 	char buf[128];
    146 	signal(sig,SIG_DFL);
    147 	sprintf(buf,"\nLarn - Panic! Signal %d received [%s]",sig,signame[sig]);
    148 	write(2,buf,strlen(buf));  sleep(2);
    149 	sncbr();
    150 	savegame(savefilename);
    151 	kill(getpid(),sig); /* this will terminate us */
    152 	}
    153