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signals.c
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C/C++ Source or Header
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1991-03-01
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2KB
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86 lines
/* ************************************************************************
* file: signals.c , trapping of signals from Unix. Part of DIKUMUD *
* Usage : Signal Trapping. *
* Copyright (C) 1990, 1991 - see 'license.doc' for complete information. *
************************************************************************* */
#include <signal.h>
#include <stdio.h>
#include <sys/time.h>
#include "utils.h"
int checkpointing(void);
int shutdown_request(void);
int logsig(void);
int hupsig(void);
void signal_setup(void)
{
struct itimerval itime;
struct timeval interval;
signal(SIGUSR2, shutdown_request);
/* just to be on the safe side: */
signal(SIGHUP, hupsig);
signal(SIGPIPE, SIG_IGN);
signal(SIGINT, hupsig);
signal(SIGALRM, logsig);
signal(SIGTERM, hupsig);
/* set up the deadlock-protection */
interval.tv_sec = 900; /* 15 minutes */
interval.tv_usec = 0;
itime.it_interval = interval;
itime.it_value = interval;
setitimer(ITIMER_VIRTUAL, &itime, 0);
signal(SIGVTALRM, checkpointing);
}
int checkpointing(void)
{
extern int tics;
if (!tics)
{
log("CHECKPOINT shutdown: tics not updated");
abort();
}
else
tics = 0;
}
int shutdown_request(void)
{
extern int shutdown;
log("Received USR2 - shutdown request");
shutdown = 1;
}
/* kick out players etc */
int hupsig(void)
{
extern int shutdown;
log("Received SIGHUP, SIGINT, or SIGTERM. Shutting down");
exit(0); /* something more elegant should perhaps be substituted */
}
int logsig(void)
{
log("Signal received. Ignoring.");
}