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eefebaaa9e
Nearly every part of the code that ever handles a full backend structure has historically done it using a pair of pointer variables, one pointing at a constant struct full of function pointers, and the other pointing to a 'void *' state object that's passed to each of those. While I'm modernising the rest of the code, this seems like a good time to turn that into the same more or less type-safe and less cumbersome system as I'm using for other parts of the code, such as Socket, Plug, BinaryPacketProtocol and so forth: the Backend structure contains a vtable pointer, and a system of macro wrappers handles dispatching through that vtable.
73 lines
1.6 KiB
C
73 lines
1.6 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 *backend;
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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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backend_special(pinger->backend, 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 *backend)
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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->backend = backend;
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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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