enable liburing in runtime for kernel version >=6

The binary could have been prebuilt in a linux machine with kernel
version >= 6, but then such image could be run on an older kernel. We
need to check the kernel version in runtime and only enable the feature
when appropriate.

worker/include/DepLibUring.hpp

@@ -39,13 +39,20 @@ class DepLibUring
 	bool PrepareWrite(
 	  int sockfd, const void* data1, size_t len1, const void* data2, size_t len2, onSendCallback* cb);
 	void Submit();
+	void Enable()
+	{
+		this->enabled = true;
+	}
 	void SetActive()
 	{
-		this->active = true;
+		if (this->enabled)
+		{
+			this->active = true;
+		}
 	}
 	bool IsActive() const
 	{
-		return this->active;
+		return this->enabled && this->active;
 	}
 	io_uring* GetRing()
 	{
@@ -72,6 +79,8 @@ class DepLibUring
 	uv_poll_t* uvHandle{ nullptr };
 	// Whether we are currently sending RTP over io_uring.
 	bool active{ false };
+	// Whether io_uring is enabled in runtime.
+	bool enabled{ false };
 	// Pre-allocated UserData entries.
 	UserData userDataBuffer[QueueDepth]{};
 	// Indexes of available UserData entries.

worker/src/DepLibUring.cpp

@@ -6,6 +6,7 @@
 #include "Logger.hpp"
 #include "MediaSoupErrors.hpp"
 #include <sys/eventfd.h>
+#include <sys/utsname.h>
 
 /* Static variables. */
 
@@ -65,6 +66,8 @@ inline static void onFdEvent(uv_poll_t* handle, int status, int events)
 	}
 }
 
+/* Static class methods */
+
 void DepLibUring::ClassInit()
 {
 	const auto mayor = io_uring_major_version();
@@ -73,6 +76,29 @@ void DepLibUring::ClassInit()
 	MS_DEBUG_TAG(info, "liburing version: \"%i.%i\"", mayor, minor);
 
 	DepLibUring::liburing = new DepLibUring();
+
+	struct utsname buffer{};
+	auto err = uname(std::addressof(buffer));
+
+	if (err != 0)
+	{
+		MS_THROW_ERROR("uname() failed: %s", std::strerror(err));
+	}
+
+	MS_DEBUG_TAG(info, "kernel version: %s", buffer.version);
+
+	auto* kernelMayorCstr = buffer.release;
+	auto kernelMayorLong  = strtol(kernelMayorCstr, &kernelMayorCstr, 10);
+
+	// Enable liburing for kernel versions greather than or equal to 6.
+	if (kernelMayorLong >= 6)
+	{
+		DepLibUring::liburing->Enable();
+	}
+	else
+	{
+		MS_DEBUG_TAG(info, "kernel version not compatible with liburing");
+	}
 }
 
 void DepLibUring::ClassDestroy()