close inherited file descriptors if closefrom() is available

Author: neilstephens

CMakeLists.txt

@@ -61,6 +61,12 @@ if(CMAKE_USE_PTHREADS_INIT)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
 endif()
 
+include(CheckFunctionExists)
+check_function_exists(closefrom HAVE_CLOSEFROM)
+if(HAVE_CLOSEFROM)
+	add_definitions(-DHAVE_CLOSEFROM)
+endif()
+
 add_definitions(-DASIO_STANDALONE)
 if(NOT EXISTS "${CMAKE_SOURCE_DIR}/src/submodules/asio/.git")
 	execute_process(COMMAND git submodule update --init -- src/submodules/asio

src/main.cpp

@@ -24,9 +24,14 @@
 #include <thread>
 #include <exception>
 #include <memory>
+#include <unistd.h>
 
 int main(int argc, char* argv[])
 {
+	#ifdef HAVE_CLOSEFROM
+	//close any inherrited file descriptors
+	closefrom(3);
+	#endif
 try
 {
 	CmdArgs Args(argc,argv);