I am trying to detect shut down or reboot from Linux in the c program. I found that the program can use a signal(SIGTERM, handler) (SIGKILL, handler). But these two will trigger if the user kills the process with a command, too.
At some solutions, they said can use the runlevel but it doesn't work. Don't know if the process is killed before the system init the run level. I even try to put the script in rcx.d, but it still doesn't work.
Can anyone have some advice? I need to run on many kinds of Linux systems.
I used the R solution, but I still don't see my data were clear at reboot or shutdown. Is it my function is wrong??
int start() {
if (initIni() == EXIT_FAILURE)
return EXIT_FAILURE;
struct sigaction act;
memset(&act, '\0', sizeof(act));
act.sa_sigaction = &signal_callback_handler;
act.sa_flags = SA_SIGINFO;
sigaction(SIGTERM, &act, NULL);
....
}
void signal_callback_handler(int signum, siginfo_t *siginfo, void *context) {
if (signum == SIGTERM && (long)siginfo->si_pid == 1) {
clearData();
}
exit(signum);
}
I also used David Schwartz's run level(8) nothing helped me.
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