mirror of
https://git.tartarus.org/simon/putty.git
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7ecf13564a
which pretty much any module can call to request a call-back in the future. So terminal.c can do its own handling of blinking, visual bells and deferred screen updates, without having to rely on term_update() being called 50 times a second (fixes: pterm-timer); and ssh.c and telnet.c both invoke a new module pinger.c which takes care of sending keepalives, so they get sent uniformly in all front ends (fixes: plink-keepalives, unix-keepalives). [originally from svn r4906] [this svn revision also touched putty-wishlist]
72 lines
1.5 KiB
C
72 lines
1.5 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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long 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, long now)
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{
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Pinger pinger = (Pinger)ctx;
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if (pinger->pending && now - pinger->next >= 0) {
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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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int 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 || next < pinger->next) {
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pinger->next = next;
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pinger->pending = TRUE;
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}
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}
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Pinger pinger_new(Config *cfg, Backend *back, void *backhandle)
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{
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Pinger pinger = snew(struct pinger_tag);
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pinger->interval = cfg->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, Config *oldcfg, Config *newcfg)
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{
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if (oldcfg->ping_interval != newcfg->ping_interval) {
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pinger->interval = newcfg->ping_interval;
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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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