Add new utility functions FileCommit(), RenameOver()

src/util.cpp

@@ -910,6 +910,27 @@ void CreatePidFile(const boost::filesystem::path &path, pid_t pid)
     }
 }
 
+bool RenameOver(boost::filesystem::path src, boost::filesystem::path dest)
+{
+#ifdef WIN32
+    return MoveFileEx(src.string().c_str(), dest.string().c_str(),
+                      MOVEFILE_REPLACE_EXISTING);
+#else
+    int rc = std::rename(src.string().c_str(), dest.string().c_str());
+    return (rc == 0);
+#endif /* WIN32 */
+}
+
+void FileCommit(FILE *fileout)
+{
+    fflush(fileout);                // harmless if redundantly called
+#ifdef WIN32
+    _commit(_fileno(fileout));
+#else
+    fsync(fileno(fileout));
+#endif
+}
+
 int GetFilesize(FILE* file)
 {
     int nSavePos = ftell(file);