www.nico.schottelius.org/software/cinit/browse_source/cinit-0.0.8/generic/set_signals.c

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/*
* (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
* cinit.c
* part of cLinux/cinit
*/
#include <signal.h>
#include <stdio.h>
#include "cinit.h"
void set_signals(int action)
{
struct sigaction sa;
if(action == ACT_SERV) {
sa.sa_handler=SIG_IGN;
} else {
sa.sa_handler=SIG_DFL;
}
sigaction(SIGINT,&sa,NULL); /* ignore ctr+c and ctr+alt+del */
sigaction(SIGPIPE,&sa,NULL); /* what todo when pipe/fifo closed */
sigaction(SIGQUIT,&sa,NULL); /* QUIT... */
sigaction(SIGTTIN,&sa,NULL);
sigaction(SIGTTOU,&sa,NULL);
sigaction(SIGSTOP,&sa,NULL);
/* cleaning dead processes */
if(action == ACT_SERV) {
sa.sa_handler=sig_child;
}
sigaction(SIGCHLD,&sa,NULL); /* what todo when a child exited */
/* sigio is called to act on the socket */
if(action == ACT_SERV) {
sa.sa_handler=sigio;
}
sigaction(SIGIO,&sa,NULL);
/* signal handlers to do special things with: reboot */
if(action == ACT_SERV) {
sa.sa_handler=sig_reboot;
}
sigaction(SIGUSR1,&sa,NULL); /* halt */
sigaction(SIGUSR2,&sa,NULL); /* Rescue */
sigaction(SIGTERM,&sa,NULL); /* poweroff */
sigaction(SIGHUP,&sa,NULL); /* reboot */
}