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