/* * nullplug.c: provide a null implementation of the Plug vtable which * ignores all calls. Occasionally useful in cases where we want to * make a network connection just to see if it works, but not do * anything with it afterwards except close it again. */ #include "putty.h" static void nullplug_socket_log(Plug *plug, int type, SockAddr *addr, int port, const char *error_msg, int error_code) { } static void nullplug_closing(Plug *plug, const char *error_msg, int error_code, bool calling_back) { } static void nullplug_receive(Plug *plug, int urgent, const char *data, int len) { } static void nullplug_sent(Plug *plug, int bufsize) { } static const PlugVtable nullplug_plugvt = { nullplug_socket_log, nullplug_closing, nullplug_receive, nullplug_sent, NULL }; static Plug nullplug_plug = { &nullplug_plugvt }; /* * There's a singleton instance of nullplug, because it's not * interesting enough to worry about making more than one of them. */ Plug *const nullplug = &nullplug_plug;