diff --git a/include/utils/file.h b/include/utils/file.h
index 8685ee2..a80afb1 100644
--- a/include/utils/file.h
+++ b/include/utils/file.h
@@ -22,8 +22,11 @@
 
 namespace android {
 
+bool ReadFdToString(int fd, std::string* content);
 bool ReadFileToString(const std::string& path, std::string* content);
+
 bool WriteStringToFile(const std::string& content, const std::string& path);
+bool WriteStringToFd(const std::string& content, int fd);
 
 #if !defined(_WIN32)
 bool WriteStringToFile(const std::string& content, const std::string& path,