Add Swaylock support

src/Process.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <iostream>
+#include <sched.h>
+#include <string>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <vector>
+
+#define SWAYBGPROCESS_BUFFER_SIZE 4094
+
+class Process {
+	public:
+
+	Process(const std::string& execPath, const std::vector<const char*>& args);
+
+	~Process();
+
+	void exec();
+
+	void kill();
+	int wait();
+
+	private:
+
+	std::string execPath;
+	std::vector<const char*> args;
+	pid_t pid;
+	bool killed = true;
+
+	int fds[2]; // file descriptors for pipe
+	char buf[SWAYBGPROCESS_BUFFER_SIZE];
+	ssize_t nbytes;
+};
+