/**
*断言
*/
void
nc_assert(const char *cond, const char *file, int line, int panic)
{
log_error("assert '%s' failed @ (%s, %d)", cond, file, line);
if (panic) {
nc_stacktrace(1);
abort();
}
}
void
signal_handler(int signo)
{
struct signal *sig;
void (*action)(void);
char *actionstr;
bool done;
for (sig = signals; sig->signo != 0; sig++) {
if (sig->signo == signo) {
break;
}
}
ASSERT(sig->signo != 0);
actionstr = "";
action = NULL;
done = false;
switch (signo) {
case SIGUSR1:
break;
case SIGUSR2:
break;
case SIGTTIN:
actionstr = ", up logging level";
action = log_level_up;
break;
case SIGTTOU:
actionstr = ", down logging level";
action = log_level_down;
break;
// using svc -h to close program is our convention, so we take it as SIGINT
//case SIGHUP:
//actionstr = ", reopening log file";
//action = log_reopen;
//break;
case SIGHUP:
case SIGINT:
done = true;
actionstr = ", exiting";
break;
case SIGSEGV:
nc_stacktrace(1);
actionstr = ", core dumping";
raise(SIGSEGV);
break;
default:
NOT_REACHED();
}
loga("signal %d (%s) received%s", signo, sig->signame, actionstr);
if (action != NULL) {
action();
}
if (done) {
exit(1);
}
}