зеркало из https://github.com/github/putty.git
73 строки
1.6 KiB
C
73 строки
1.6 KiB
C
/*
|
|
* pinger.c: centralised module that deals with sending SS_PING
|
|
* keepalives, to avoid replicating this code in multiple backends.
|
|
*/
|
|
|
|
#include "putty.h"
|
|
|
|
struct Pinger {
|
|
int interval;
|
|
int pending;
|
|
unsigned long when_set, next;
|
|
Backend *backend;
|
|
};
|
|
|
|
static void pinger_schedule(Pinger *pinger);
|
|
|
|
static void pinger_timer(void *ctx, unsigned long now)
|
|
{
|
|
Pinger *pinger = (Pinger *)ctx;
|
|
|
|
if (pinger->pending && now == pinger->next) {
|
|
backend_special(pinger->backend, SS_PING, 0);
|
|
pinger->pending = false;
|
|
pinger_schedule(pinger);
|
|
}
|
|
}
|
|
|
|
static void pinger_schedule(Pinger *pinger)
|
|
{
|
|
unsigned long next;
|
|
|
|
if (!pinger->interval) {
|
|
pinger->pending = false; /* cancel any pending ping */
|
|
return;
|
|
}
|
|
|
|
next = schedule_timer(pinger->interval * TICKSPERSEC,
|
|
pinger_timer, pinger);
|
|
if (!pinger->pending ||
|
|
(next - pinger->when_set) < (pinger->next - pinger->when_set)) {
|
|
pinger->next = next;
|
|
pinger->when_set = timing_last_clock();
|
|
pinger->pending = true;
|
|
}
|
|
}
|
|
|
|
Pinger *pinger_new(Conf *conf, Backend *backend)
|
|
{
|
|
Pinger *pinger = snew(Pinger);
|
|
|
|
pinger->interval = conf_get_int(conf, CONF_ping_interval);
|
|
pinger->pending = false;
|
|
pinger->backend = backend;
|
|
pinger_schedule(pinger);
|
|
|
|
return pinger;
|
|
}
|
|
|
|
void pinger_reconfig(Pinger *pinger, Conf *oldconf, Conf *newconf)
|
|
{
|
|
int newinterval = conf_get_int(newconf, CONF_ping_interval);
|
|
if (conf_get_int(oldconf, CONF_ping_interval) != newinterval) {
|
|
pinger->interval = newinterval;
|
|
pinger_schedule(pinger);
|
|
}
|
|
}
|
|
|
|
void pinger_free(Pinger *pinger)
|
|
{
|
|
expire_timer_context(pinger);
|
|
sfree(pinger);
|
|
}
|