From 74e9bc3826aaec3b5a90e077fbed19a7c798edda Mon Sep 17 00:00:00 2001
From: hyung-hwan <hyunghwan.chung@gmail.com>
Date: Mon, 31 Jan 2022 12:50:52 +0000
Subject: [PATCH] added qse_set_sck_keepalive()

---
 qse/include/qse/si/sck.h |  8 ++++++++
 qse/lib/si/sck.c         | 19 +++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/qse/include/qse/si/sck.h b/qse/include/qse/si/sck.h
index a8e2b339..3433d22b 100644
--- a/qse/include/qse/si/sck.h
+++ b/qse/include/qse/si/sck.h
@@ -121,6 +121,14 @@ QSE_EXPORT int qse_fini_sck_conn (
 	qse_sck_hnd_t handle
 );
 
+QSE_EXPORT int qse_set_sck_keepalive (
+	qse_sck_hnd_t handle,
+	int           enabled,
+	int           tcp_keepidle,
+	int           tcp_keepintvl,
+	int           tcp_keepcnt
+);
+
 #if defined(__cplusplus)
 }
 #endif
diff --git a/qse/lib/si/sck.c b/qse/lib/si/sck.c
index ce2fdf3b..4f35fe24 100644
--- a/qse/lib/si/sck.c
+++ b/qse/lib/si/sck.c
@@ -343,6 +343,25 @@ int qse_fini_sck_conn (qse_sck_hnd_t handle)
 	return 1; /* connected */
 }
 
+int qse_set_sck_keepalive (qse_sck_hnd_t handle, int enabled, int tcp_keepidle, int tcp_keepintvl, int tcp_keepcnt)
+{
+	if (setsockopt(handle, SOL_SOCKET, SO_KEEPALIVE, (char*)&enabled, QSE_SIZEOF(enabled)) <= -1) return -1;
+
+	// the following values are just hints. 
+	// i don't care about success and failure
+#if defined(TCP_KEEPIDLE) && defined(SOL_TCP)
+	if (tcp_keepidle > 0) setsockopt (handle, SOL_TCP, TCP_KEEPIDLE, (char*)&tcp_keepidle, QSE_SIZEOF(tcp_keepidle));
+#endif
+#if defined(TCP_KEEPINTVL) && defined(SOL_TCP)
+	if (tcp_keepintvl > 0) setsockopt (handle, SOL_TCP, TCP_KEEPINTVL, (char*)&tcp_keepintvl, QSE_SIZEOF(tcp_keepintvl));
+#endif
+#if defined(TCP_KEEPCNT) && defined(SOL_TCP)
+	if (tcp_keepcnt > 0) setsockopt (handle, SOL_TCP, TCP_KEEPCNT, (char*)&tcp_keepcnt, QSE_SIZEOF(tcp_keepcnt));
+#endif
+	return 0;
+}
+
+
 #if 0
 qse_sck_hnd_t