void ping(int argc, char **argv)
{
int err;
/* init options */
init_options();
/* parse args */
if ((err = parse_args(argc, argv)) < 0) {
if (err == -1)
usage();
return;
}
/* signal install */
signal(SIGALRM, sigalrm);
signal(SIGINT, sigint);
/* address */
skaddr.dst_addr = ipaddr;
sock = _socket(AF_INET, SOCK_RAW, IP_P_ICMP);
/* send request */
sigalrm(SIGALRM);
/* receive reply */
recv_packet();
alarm(0);
close_socket();
if (buf)
free(buf);
ping_stat();
}
void *sh_timeradd(unsigned long msec,int flags,void (*action)(void*),void *handle)
{
register Timer_t *tp;
double t;
Handler_t fn;
t = ((double)msec)/1000.;
if(t<=0 || !action)
return((void*)0);
if(tp=tpfree)
tpfree = tp->next;
else if(!(tp=(Timer_t*)malloc(sizeof(Timer_t))))
return((void*)0);
tp->wakeup = getnow() + t;
tp->incr = (flags?t:0);
tp->action = action;
tp->handle = handle;
time_state |= IN_ADDTIMEOUT;
tp->next = tptop;
tptop = tp;
if(!tpmin || tp->wakeup < tpmin->wakeup)
{
tpmin = tp;
fn = (Handler_t)signal(SIGALRM,sigalrm);
if((t= setalarm(t))>0 && fn && fn!=(Handler_t)sigalrm)
{
Handler_t *hp = (Handler_t*)malloc(sizeof(Handler_t));
if(hp)
{
*hp = fn;
sh_timeradd((long)(1000*t), 0, oldalrm, (void*)hp);
}
}
tp = tptop;
}
else if(tpmin && !tpmin->action)
time_state |= DEFER_SIGALRM;
time_state &= ~IN_ADDTIMEOUT;
if(time_state&DEFER_SIGALRM)
{
time_state=SIGALRM_CALL;
sigalrm(SIGALRM);
if(tp!=tptop)
tp=0;
}
return((void*)tp);
}
