Implement init/deinit of inotify system

Use RAII to handle inotify resource lifetime, i.e. initialize with actor
creation and deinitialize with actor deletion.

Sources/Inotify/Inotify.swift

@@ -1,2 +1,16 @@
-actor Inotify {
+import CInotify
+
+public actor Inotify {
+	private let fd: Int32
+
+	public init() throws {
+		self.fd = inotify_init1(Int32(IN_NONBLOCK | IN_CLOEXEC))
+		guard self.fd >= 0 else {
+			throw InotifyError.initFailed(errno: cinotify_get_errno())
+		}
+	}
+
+	deinit {
+		cinotify_deinit(self.fd)
+	}
 }

Sources/Inotify/InotifyError.swift

@@ -0,0 +1,19 @@
+import CInotify
+
+public enum InotifyError: Error, Sendable, CustomStringConvertible {
+	case initFailed(errno: Int32)
+
+	public var description: String {
+		switch self {
+		case .initFailed(let code):
+			"inotify_init1 failed: \(readableErrno(code))"
+		}
+	}
+
+	private func readableErrno(_ code: Int32) -> String {
+		if let cStr = get_error_message() {
+			return String(cString: cStr) + " (errno \(code))"
+		}
+		return "errno \(code)"
+	}
+}