From e7e9a66629ada359ad6a35cdb12e0e35b49e889c Mon Sep 17 00:00:00 2001
From: marha <marha@users.sourceforge.net>
Date: Fri, 7 Aug 2009 12:33:59 +0000
Subject: Added plink tool (version without console, except if output is
 generated) Added possibility to build console application or windows
 application in makefile.after

---
 tools/plink/pinger.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 tools/plink/pinger.c

(limited to 'tools/plink/pinger.c')

diff --git a/tools/plink/pinger.c b/tools/plink/pinger.c
new file mode 100644
index 000000000..b6fde2456
--- /dev/null
+++ b/tools/plink/pinger.c
@@ -0,0 +1,71 @@
+/*
+ * pinger.c: centralised module that deals with sending TS_PING
+ * keepalives, to avoid replicating this code in multiple backends.
+ */
+
+#include "putty.h"
+
+struct pinger_tag {
+    int interval;
+    int pending;
+    long next;
+    Backend *back;
+    void *backhandle;
+};
+
+static void pinger_schedule(Pinger pinger);
+
+static void pinger_timer(void *ctx, long now)
+{
+    Pinger pinger = (Pinger)ctx;
+
+    if (pinger->pending && now - pinger->next >= 0) {
+	pinger->back->special(pinger->backhandle, TS_PING);
+	pinger->pending = FALSE;
+	pinger_schedule(pinger);
+    }
+}
+
+static void pinger_schedule(Pinger pinger)
+{
+    int 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->next) {
+	pinger->next = next;
+	pinger->pending = TRUE;
+    }
+}
+
+Pinger pinger_new(Config *cfg, Backend *back, void *backhandle)
+{
+    Pinger pinger = snew(struct pinger_tag);
+
+    pinger->interval = cfg->ping_interval;
+    pinger->pending = FALSE;
+    pinger->back = back;
+    pinger->backhandle = backhandle;
+    pinger_schedule(pinger);
+
+    return pinger;
+}
+
+void pinger_reconfig(Pinger pinger, Config *oldcfg, Config *newcfg)
+{
+    if (oldcfg->ping_interval != newcfg->ping_interval) {
+	pinger->interval = newcfg->ping_interval;
+	pinger_schedule(pinger);
+    }
+}
+
+void pinger_free(Pinger pinger)
+{
+    expire_timer_context(pinger);
+    sfree(pinger);
+}
-- 
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