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Commit | Line | Data |
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1c1af145 | 1 | /* |
2 | * pinger.c: centralised module that deals with sending TS_PING | |
3 | * keepalives, to avoid replicating this code in multiple backends. | |
4 | */ | |
5 | ||
6 | #include "putty.h" | |
7 | ||
8 | struct pinger_tag { | |
9 | int interval; | |
10 | int pending; | |
11 | long next; | |
12 | Backend *back; | |
13 | void *backhandle; | |
14 | }; | |
15 | ||
16 | static void pinger_schedule(Pinger pinger); | |
17 | ||
18 | static void pinger_timer(void *ctx, long now) | |
19 | { | |
20 | Pinger pinger = (Pinger)ctx; | |
21 | ||
22 | if (pinger->pending && now - pinger->next >= 0) { | |
23 | pinger->back->special(pinger->backhandle, TS_PING); | |
24 | pinger->pending = FALSE; | |
25 | pinger_schedule(pinger); | |
26 | } | |
27 | } | |
28 | ||
29 | static void pinger_schedule(Pinger pinger) | |
30 | { | |
31 | int next; | |
32 | ||
33 | if (!pinger->interval) { | |
34 | pinger->pending = FALSE; /* cancel any pending ping */ | |
35 | return; | |
36 | } | |
37 | ||
38 | next = schedule_timer(pinger->interval * TICKSPERSEC, | |
39 | pinger_timer, pinger); | |
40 | if (!pinger->pending || next < pinger->next) { | |
41 | pinger->next = next; | |
42 | pinger->pending = TRUE; | |
43 | } | |
44 | } | |
45 | ||
46 | Pinger pinger_new(Config *cfg, Backend *back, void *backhandle) | |
47 | { | |
48 | Pinger pinger = snew(struct pinger_tag); | |
49 | ||
50 | pinger->interval = cfg->ping_interval; | |
51 | pinger->pending = FALSE; | |
52 | pinger->back = back; | |
53 | pinger->backhandle = backhandle; | |
54 | pinger_schedule(pinger); | |
55 | ||
56 | return pinger; | |
57 | } | |
58 | ||
59 | void pinger_reconfig(Pinger pinger, Config *oldcfg, Config *newcfg) | |
60 | { | |
61 | if (oldcfg->ping_interval != newcfg->ping_interval) { | |
62 | pinger->interval = newcfg->ping_interval; | |
63 | pinger_schedule(pinger); | |
64 | } | |
65 | } | |
66 | ||
67 | void pinger_free(Pinger pinger) | |
68 | { | |
69 | expire_timer_context(pinger); | |
70 | sfree(pinger); | |
71 | } |