Checkpointing some stuff. No way it'll build yet.

utils/cloudio/SMComm.h

@@ -0,0 +1,54 @@
+# copy some licensing stuff here
+
+#ifndef SMCOMM_H_
+#define SMCOMM_H_
+
+namespace idbdatafile {
+
+class SMComm : public boost::noncopyable
+{
+    public:
+        SMComm *get();
+        
+        /* Open currently returns a stat struct so SMDataFile can set its initial position, otherwise
+           behaves how you'd think. */
+        int open(const std::string &filename, int mode, struct stat *statbuf);
+        
+        ssize_t pread(const std::string &filename, const void *buf, size_t count, off_t offset);
+        
+        ssize_t pwrite(const std::string &filename, const void *buf, size_t count, off_t offset);
+        
+        /* append exists for cases where the file is open in append mode.  A normal write won't work
+        because the file position may be out of date if there are multiple writers. */
+        ssize_t append(const std::string &filename, const void *buf, size_t count);
+        
+        int unlink(const std::string &filename);
+        
+        int stat(const std::string &filename, struct stat *statbuf);
+        
+        // added this one because it should be trivial to implement in SM, and prevents a large
+        // operation in SMDataFile.
+        int truncate(const std::string &filename, off64_t length);
+        
+        int listDirectory(const std::string &path, std::list<std::string> *entries);
+        
+        // health indicator.  0 = processes are talking to each other and SM has read/write access to 
+        // the specified S3 bucket.  Need to define specific error codes.
+        int ping();
+        
+        virtual ~SMComm();
+        
+    private:
+        SMComm();
+        
+        SocketPool sockets;
+
+
+}
+
+
+}
+
+
+
+#endif