libsaria: Allow different UIs to use a different pipe

The UI now passes in a string to use as the filename.  In addition, I
store the filename and remove it when the application is closed.  If the
pipe already exists, then I return the path without creating a new one.

Pipes will only be removed by the application that creates them.

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

include/libsaria/path.h

@@ -19,6 +19,7 @@ string get_saria_dir();
 void make_saria_dir();
 bool exists(string);
 sid_t lookup_songid(string &);
-string get_pipe_file();
+string open_pipe(string);
+void close_pipes();
 
 #endif /* LIBSARIA_PATH_H */

libsaria/libsaria.cpp

@@ -31,6 +31,7 @@ namespace libsaria
 		println("Quitting libsaria");
 		print_format_stats();
 		index::print_stats();
+		close_pipes();
 	}
 
 };

libsaria/path/dir.cpp

@@ -5,6 +5,7 @@
 #include <libsaria/path.h>
 
 #include <iostream>
+#include <list>
 using namespace std;
 
 /* I want to use the d_type field in a dirent */
@@ -63,12 +64,22 @@ sid_t lookup_songid(string &filepath)
 	return stat.st_ino;
 }
 
-string get_pipe_file()
-{
-	struct stat stat;
-	string file = get_saria_dir() + "/saria.pipe";
+static list<string> open_pipes;
 
-	if (lstat(file.c_str(), &stat) != 0)
-		return "";
+string open_pipe(string filename)
+{
+	string file = get_saria_dir() + "/" + filename;
+
+	if (!exists(file)) {
+		open_pipes.push_back(file);
+		mkfifo(file.c_str(), 0644);
+	}
 	return file;
 }
+
+void close_pipes()
+{
+	list<string>::iterator it;
+	for (it = open_pipes.begin(); it != open_pipes.end(); it++)
+		unlink((*it).c_str());
+}

ocarina/pipe.cpp

@@ -6,6 +6,8 @@
 #include <ocarina/ocarina.h>
 
 #include <glib.h>
+#include <string>
+using namespace std;
 
 static GIOChannel *pipe_in;
 
@@ -46,7 +48,7 @@ namespace ocarina
 	void init_pipe()
 	{
 		GError *error = NULL;
-		string pipe = get_pipe_file();
+		string pipe = open_pipe("ocarina.pipe");
 		if (pipe == "")
 			return;