c - signal names generated on interface "org.freedesktop.NetworkManager.Device" of Network Manager in linux -


i new dbus , trying catch signal generated when network cable plugged in or plugged out.i trying sample code given @ "http://software.intel.com/en-us/articles/detecting-network-connectivity-using-d-bus"

what signal name shall use in dbus_message_is_signal() info.provide sample code can clear concept.

my code is:

enter code here  #include<stdio.h> #include<dbus/dbus.h> #include <gdbus.h>  #include<stdbool.h> #include<unistd.h> #include<stdlib.h> #include<dbus/dbus-glib-bindings.h> #include <dbus/dbus-glib.h> #include <dbus/dbus-glib-lowlevel.h>  #define platform_service          "org.freedesktop.networkmanager" #define platform_path                    "/org/freedesktop/networkmanager" #define platform_connection_if    "org.freedesktop.networkmanager"   main() {          dbusmessage* msg;         dbusconnection* conn;         dbuserror err;          printf("listening signals\n");          // initialise errors         dbus_error_init(&err);           //connect bus , check errors          conn = dbus_bus_get(dbus_bus_system, &err);          if (dbus_error_is_set(&err))                 {                 fprintf(stderr, "connection error (%s)n", err.message);                 dbus_error_free(&err);                 }          if (null == conn)                 {                 printf("error in connection\n");                 exit(1);                 }  dbus_bus_add_match(conn, "type='signal',interface='org.freedesktop.networkmanager'", &err);         dbus_connection_flush(conn);          if (dbus_error_is_set(&err))         {                fprintf(stderr, "match error (%s)n", err.message);                exit(1);         }          printf("match rule sent\n");            g_message("listening d-bus signals using connection filter");   // loop listening signals being emmitted         while (true)         {                 printf("in while \n");                // non blocking read of next available message               dbus_connection_read_write(conn,0);                msg = dbus_connection_pop_message(conn);                // loop again if haven't read message                if (null == msg)                {                       sleep(1);                       continue;                }                  if (dbus_message_is_signal(msg, platform_connection_if,"propertieschanged"))                       printf("received signal propertychanged \n");  if (dbus_message_is_signal(msg, platform_connection_if, "deviceremoved"))                       printf("received signal %s\n", "device changed");    // free message                dbus_message_unref(msg);         } }

i can property changed signal how other signals.

look @ networkmanager spec @ http://projects.gnome.org/networkmanager/developers/api/09/spec.html -- provides of details of interface.

signals can of interest "deviceadded" , "deviceremoved" discover when devices come , go (cable plugged , unplugged). can dive down org.freedesktop.networkmanager.device "propertieschanged" signal , grab "state" property, among others.


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