From 7daf51f2da79ff8ec2a2b4d3c9ce9b98b2b2dee8 Mon Sep 17 00:00:00 2001
From: server <server@jakubkadlec.dev>
Date: Tue, 14 Apr 2026 06:04:12 +0200
Subject: [PATCH] runtime: improve startup observability

---
 src/db/Main.cpp           | 40 ++++++++++++++++++++++++-
 src/game/main.cpp         | 61 ++++++++++++++++++++++++++++++++++++++-
 src/libthecore/socket.cpp | 27 +++++++++++++++++
 3 files changed, 126 insertions(+), 2 deletions(-)

diff --git a/src/db/Main.cpp b/src/db/Main.cpp
index cd71952..4801d9a 100644
--- a/src/db/Main.cpp
+++ b/src/db/Main.cpp
@@ -45,6 +45,43 @@ extern const char * _malloc_options;
 
 extern void WriteVersion();
 
+namespace
+{
+const char* BoolState(bool value)
+{
+	return value ? "on" : "off";
+}
+
+const char* EmptyToLabel(const std::string& value, const char* fallback)
+{
+	return value.empty() ? fallback : value.c_str();
+}
+
+void LogStartupSummary(int heart_fps, int player_id_start)
+{
+	sys_log(0,
+		"[STARTUP] locale=%s table_postfix=%s player_db=%s player_id_start=%d heart_fps=%d test_server=%s log=%s hotbackup=%s",
+		EmptyToLabel(g_stLocale, "<unset>"),
+		EmptyToLabel(g_stTablePostfix, "<none>"),
+		EmptyToLabel(g_stPlayerDBName, "<unset>"),
+		player_id_start,
+		heart_fps,
+		BoolState(g_test_server),
+		BoolState(g_log != 0),
+		BoolState(g_bHotBackup)
+	);
+
+	sys_log(0,
+		"[STARTUP] cache_flush player=%d item=%d pricelist=%d logout=%d locale_name_column=%s",
+		g_iPlayerCacheFlushSeconds,
+		g_iItemCacheFlushSeconds,
+		g_iItemPriceListTableCacheFlushSeconds,
+		g_iLogoutSeconds,
+		EmptyToLabel(g_stLocaleNameColumn, "<unset>")
+	);
+}
+}
+
 void emergency_sig(int sig)
 {
 	if (sig == SIGSEGV)
@@ -374,6 +411,8 @@ int Start()
 		return false;
 	}
 
+	LogStartupSummary(heart_beat, iIDStart);
+
 #ifndef OS_WINDOWS
 	signal(SIGUSR1, emergency_sig);
 #endif
@@ -409,4 +448,3 @@ const char * GetPlayerDBName()
 {
 	return g_stPlayerDBName.c_str();
 }
-
diff --git a/src/game/main.cpp b/src/game/main.cpp
index bcedeab..ef74890 100644
--- a/src/game/main.cpp
+++ b/src/game/main.cpp
@@ -167,6 +167,64 @@ void ShutdownOnFatalError()
 
 namespace
 {
+	const char* BoolState(bool value)
+	{
+		return value ? "on" : "off";
+	}
+
+	const char* EmptyToLabel(const char* value, const char* fallback)
+	{
+		return (value && *value) ? value : fallback;
+	}
+
+	const char* EmptyToLabel(const std::string& value, const char* fallback)
+	{
+		return value.empty() ? fallback : value.c_str();
+	}
+
+	void LogStartupSummary()
+	{
+#ifdef ENABLE_PROXY_IP
+		const char* proxy_ip = EmptyToLabel(g_stProxyIP, "<disabled>");
+#else
+		const char* proxy_ip = "<disabled>";
+#endif
+
+		sys_log(0,
+			"[STARTUP] mode=%s channel=%u bind=%s:%u p2p=%s:%u db=%s:%u locale=%s quest_dir=%s",
+			g_bAuthServer ? "auth" : "game",
+			g_bChannel,
+			EmptyToLabel(g_szPublicIP, "0.0.0.0"), mother_port,
+			EmptyToLabel(g_szPublicIP, "0.0.0.0"), p2p_port,
+			EmptyToLabel(db_addr, "<unset>"), db_port,
+			EmptyToLabel(g_stLocale, "<unset>"),
+			EmptyToLabel(g_stQuestDir, "<unset>")
+		);
+
+		sys_log(0,
+			"[STARTUP] users limit=%d full=%d busy=%d local=%u p2p_peers=%d regen=%s admin_page=%s proxy=%s",
+			g_iUserLimit,
+			g_iFullUserCount,
+			g_iBusyUserCount,
+			DESC_MANAGER::instance().GetLocalUserCount(),
+			P2P_MANAGER::instance().GetDescCount(),
+			BoolState(!g_bNoRegen),
+			BoolState(!g_stAdminPagePassword.empty()),
+			proxy_ip
+		);
+
+		sys_log(0,
+			"[STARTUP] features client_version_check=%s guild_mark_server=%s mark_min_level=%u empire_whisper=%s auth_master=%s:%u test_server=%d",
+			BoolState(g_bCheckClientVersion),
+			BoolState(guild_mark_server),
+			guild_mark_min_level,
+			BoolState(g_bEmpireWhisper),
+			EmptyToLabel(g_stAuthMasterIP, "<disabled>"),
+			g_wAuthMasterPort,
+			test_server
+		);
+	}
+
 	struct SendDisconnectFunc
 	{
 		void operator () (LPDESC d)
@@ -594,6 +652,8 @@ int start(int argc, char **argv)
 		LoadSpamDB();
 	}
 
+	LogStartupSummary();
+
 	signal_timer_enable(30);
 	return 1;
 }
@@ -778,4 +838,3 @@ int io_loop(LPFDWATCH fdw)
 
 	return 1;
 }
-
diff --git a/src/libthecore/socket.cpp b/src/libthecore/socket.cpp
index b99786e..4c070e9 100644
--- a/src/libthecore/socket.cpp
+++ b/src/libthecore/socket.cpp
@@ -10,6 +10,31 @@ void socket_timeout(socket_t s, long sec, long usec);
 void socket_reuse(socket_t s);
 void socket_keepalive(socket_t s);
 
+namespace
+{
+bool socket_accept_should_retry()
+{
+#ifdef OS_WINDOWS
+	const int wsa_error = WSAGetLastError();
+	return wsa_error == WSAEWOULDBLOCK || wsa_error == WSAEINTR;
+#else
+#ifdef EINTR
+	if (errno == EINTR)
+		return true;
+#endif
+#ifdef EAGAIN
+	if (errno == EAGAIN)
+		return true;
+#endif
+#ifdef EWOULDBLOCK
+	if (errno == EWOULDBLOCK)
+		return true;
+#endif
+	return false;
+#endif
+}
+}
+
 int socket_read(socket_t desc, char* read_point, size_t space_left)
 {
     int	ret;
@@ -206,6 +231,8 @@ socket_t socket_accept(socket_t s, struct sockaddr_in *peer)
 
     if ((desc = accept(s, (struct sockaddr *) peer, &i)) == -1)
     {
+	if (socket_accept_should_retry())
+		return -1;
 	sys_err("accept: %s (fd %d)", strerror(errno), s);
 	return -1;
     }