libsaria: Create functions for opening and closing pipes

I'm going to use the pipe with shell scripts for remote-controlling
ocarina (possibly through a web interface).

Signed-off-by: Bryan Schumaker <bjschuma@gmail.com>

include/libsaria/fs.h

@@ -30,6 +30,10 @@ namespace libsaria
 		void read(string, void (*)(ifstream &));
 		void read_now(string, void (*)(ifstream &));
 
+		void open_pipe();
+		void close_pipe();
+		string pipe_file();
+
 	} /* Namespace: app */
 
 } /* Namespace: libsaria */

include/libsaria/libsaria.h

@@ -10,6 +10,7 @@ namespace libsaria
 		char **argv;
 		string name;
 		bool enable_idle;
+		bool enable_pipe;
 	};
 
 	void init(struct initdata *);

libsaria/fs.cpp

@@ -11,6 +11,7 @@ using namespace std;
 
 static string appdir;
 static mode_t dirmode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
+static bool pipe_opened = false;
 
 static void make_dir(string path)
 {
@@ -145,4 +146,30 @@ namespace libsaria
 		stream.close();
 	}
 
+	void app::open_pipe()
+	{
+		string file = appdir + "/pipe";
+		if (!exists(file)) {
+			mkfifo(file.c_str(), 0644);
+			pipe_opened = true;
+		} else {
+			println("Pipe file: %s already exists, pipe not opened!",
+				file.c_str());
+		}
+	}
+
+	void app::close_pipe()
+	{
+		string file = appdir + "/pipe";
+		if (pipe_opened && exists(file))
+			rm("pipe");
+	}
+
+	string app::pipe_file()
+	{
+		if (pipe_opened)
+			return appdir + "/pipe";
+		return "";
+	}
+
 } /* Namespace: libsaria */

libsaria/libsaria.cpp

@@ -28,19 +28,22 @@ namespace libsaria
 			idle::enable();
 
 		audio::init(init->argc, init->argv);
-
 		libsaria::deck::init();
 		libsaria::library::init();
 		libsaria::deck::load_all();
+
+		if (init->enable_pipe)
+			app::open_pipe();
+
 	}
 
 	void quit()
 	{
 		println("Quitting libsaria");
+		app::close_pipe();
 		audio::quit();
 		print_format_stats();
 		Index::print_stats();
-		/*close_pipes();*/
 	}
 
 	void play_outside_song(string &filepath)

ocarina/ocarina.cpp

@@ -80,6 +80,7 @@ int main(int argc, char **argv)
 		argv,
 		"ocarina",	/* app name */
 		true,		/* Use idle queue? */
+		true,		/* Use global pipe? */
 	};
 	println("Ocarina " + vers_str());
 	set_path_prefix(argv[0]);