_exec_script() close fd and reset signal

+ somes more adjustements in _exec_script()
+ rough notes for non blocking CGI

memo.txt

@@ -10,6 +10,18 @@
 - handle redirection (Work, but weird behavior need deeper test)
 - Ecrire des tests !
 
+- cgi_cpp_status.cpp with POST dont show error page. Normal or not ?
+
+For non blocking CGI :
+	// We could maybe,
+	// add FD_RD_FR_CHLD to epoll,
+	// return to the main loop,
+	// read FD_RD_FR_CHLD each time epoll say its ready,
+	// then try waitpid() with WNOHANG after each read.
+	// when waitpid() tell us its finish (or maybe when epoll return EPOLLHUP)
+	// then actually parse the script_output and send it to the client.
+
+
 ----Priorité modérée------------------------
 - namespace utils ?
 - change "std::string" to reference "std::string &" in most functions