diff options
Diffstat (limited to 'larn/signal.c')
| -rw-r--r-- | larn/signal.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/larn/signal.c b/larn/signal.c new file mode 100644 index 00000000..60bd6ce1 --- /dev/null +++ b/larn/signal.c @@ -0,0 +1,148 @@ +#include <signal.h> +#include "header.h" /* "Larn is copyrighted 1986 by Noah Morgan.\n" */ +#define BIT(a) (1<<((a)-1)) +extern char savefilename[],wizard,predostuff,nosignal; +static s2choose() /* text to be displayed if ^C during intro screen */ + { + cursor(1,24); lprcat("Press "); setbold(); lprcat("return"); resetbold(); + lprcat(" to continue: "); lflush(); + } + +static void +cntlc() /* what to do for a ^C */ + { + if (nosignal) return; /* don't do anything if inhibited */ + signal(SIGQUIT,SIG_IGN); signal(SIGINT,SIG_IGN); + quit(); if (predostuff==1) s2choose(); else showplayer(); + lflush(); + signal(SIGQUIT,cntlc); signal(SIGINT,cntlc); + } + +/* + * subroutine to save the game if a hangup signal + */ +static void +sgam() + { + savegame(savefilename); wizard=1; died(-257); /* hangup signal */ + } + +#ifdef SIGTSTP +static void +tstop() /* control Y */ + { + if (nosignal) return; /* nothing if inhibited */ + lcreat((char*)0); clearvt100(); lflush(); signal(SIGTSTP,SIG_DFL); +#ifdef SIGVTALRM + /* looks like BSD4.2 or higher - must clr mask for signal to take effect*/ + sigsetmask(sigblock(0)& ~BIT(SIGTSTP)); +#endif + kill(getpid(),SIGTSTP); + + setupvt100(); signal(SIGTSTP,tstop); + if (predostuff==1) s2choose(); else drawscreen(); + showplayer(); lflush(); + } +#endif SIGTSTP + +/* + * subroutine to issue the needed signal traps called from main() + */ +static void sigpanic(); +static void sigill() { sigpanic(SIGILL); } +static void sigtrap() { sigpanic(SIGTRAP); } +static void sigiot() { sigpanic(SIGIOT); } +static void sigemt() { sigpanic(SIGEMT); } +static void sigfpe() { sigpanic(SIGFPE); } +static void sigbus() { sigpanic(SIGBUS); } +static void sigsegv() { sigpanic(SIGSEGV); } +static void sigsys() { sigpanic(SIGSYS); } +static void sigpipe() { sigpanic(SIGPIPE); } +static void sigterm() { sigpanic(SIGTERM); } +sigsetup() + { + signal(SIGQUIT, cntlc); signal(SIGINT, cntlc); + signal(SIGKILL, SIG_IGN); signal(SIGHUP, sgam); + signal(SIGILL, sigill); signal(SIGTRAP, sigtrap); + signal(SIGIOT, sigiot); signal(SIGEMT, sigemt); + signal(SIGFPE, sigfpe); signal(SIGBUS, sigbus); + signal(SIGSEGV, sigsegv); signal(SIGSYS, sigsys); + signal(SIGPIPE, sigpipe); signal(SIGTERM, sigterm); +#ifdef SIGTSTP + signal(SIGTSTP,tstop); signal(SIGSTOP,tstop); +#endif SIGTSTP + } + +#ifdef BSD /* for BSD UNIX? */ + +static char *signame[NSIG] = { "", +"SIGHUP", /* 1 hangup */ +"SIGINT", /* 2 interrupt */ +"SIGQUIT", /* 3 quit */ +"SIGILL", /* 4 illegal instruction (not reset when caught) */ +"SIGTRAP", /* 5 trace trap (not reset when caught) */ +"SIGIOT", /* 6 IOT instruction */ +"SIGEMT", /* 7 EMT instruction */ +"SIGFPE", /* 8 floating point exception */ +"SIGKILL", /* 9 kill (cannot be caught or ignored) */ +"SIGBUS", /* 10 bus error */ +"SIGSEGV", /* 11 segmentation violation */ +"SIGSYS", /* 12 bad argument to system call */ +"SIGPIPE", /* 13 write on a pipe with no one to read it */ +"SIGALRM", /* 14 alarm clock */ +"SIGTERM", /* 15 software termination signal from kill */ +"SIGURG", /* 16 urgent condition on IO channel */ +"SIGSTOP", /* 17 sendable stop signal not from tty */ +"SIGTSTP", /* 18 stop signal from tty */ +"SIGCONT", /* 19 continue a stopped process */ +"SIGCHLD", /* 20 to parent on child stop or exit */ +"SIGTTIN", /* 21 to readers pgrp upon background tty read */ +"SIGTTOU", /* 22 like TTIN for output if (tp->t_local<OSTOP) */ +"SIGIO", /* 23 input/output possible signal */ +"SIGXCPU", /* 24 exceeded CPU time limit */ +"SIGXFSZ", /* 25 exceeded file size limit */ +"SIGVTALRM",/* 26 virtual time alarm */ +"SIGPROF", /* 27 profiling time alarm */ +"","","","" }; + +#else BSD /* for system V? */ + +static char *signame[NSIG] = { "", +"SIGHUP", /* 1 hangup */ +"SIGINT", /* 2 interrupt */ +"SIGQUIT", /* 3 quit */ +"SIGILL", /* 4 illegal instruction (not reset when caught) */ +"SIGTRAP", /* 5 trace trap (not reset when caught) */ +"SIGIOT", /* 6 IOT instruction */ +"SIGEMT", /* 7 EMT instruction */ +"SIGFPE", /* 8 floating point exception */ +"SIGKILL", /* 9 kill (cannot be caught or ignored) */ +"SIGBUS", /* 10 bus error */ +"SIGSEGV", /* 11 segmentation violation */ +"SIGSYS", /* 12 bad argument to system call */ +"SIGPIPE", /* 13 write on a pipe with no one to read it */ +"SIGALRM", /* 14 alarm clock */ +"SIGTERM", /* 15 software termination signal from kill */ +"SIGUSR1", /* 16 user defines signal 1 */ +"SIGUSR2", /* 17 user defines signal 2 */ +"SIGCLD", /* 18 child death */ +"SIGPWR", /* 19 power fail */ +"","","","","","","","","","","","" }; + +#endif BSD + +/* + * routine to process a fatal error signal + */ +static void +sigpanic(sig) + int sig; + { + char buf[128]; + signal(sig,SIG_DFL); + sprintf(buf,"\nLarn - Panic! Signal %d received [%s]",sig,signame[sig]); + write(2,buf,strlen(buf)); sleep(2); + sncbr(); + savegame(savefilename); + kill(getpid(),sig); /* this will terminate us */ + } |