Hi All, I am using dbus glib binding. I have a code where i am trying to transfer a 5 MB file over dbus. I am getting an error which is "Failed to write file 'copy-client.JK5K5T': fwrite() failed: Bad address" However for small file ( about 10-20 k), I am not getting the same problem. I looked up the dbus specs and that says that the max message size is 2 pow 27. I am not able to understand the reason of failure. I am attaching my code for your reference. --------------- server-code------------ /* some-object.h */ #ifndef __SOME_OBJECT_H__ #define __SOME_OBJECT_H__ #include <glib-object.h> typedef struct _SomeObject SomeObject; struct _SomeObject {     GObject        parent_obj;     gint         m_a;     gchar*        m_b;     gfloat        m_c; }; typedef struct _SomeObjectClass SomeObjectClass; struct _SomeObjectClass {     GObjectClass    parent_class;     /* Some useful methods may follow. */     gboolean    (*method1)    (SomeObject *self, gint x,gchar **y,gint *z,GError **error);     void        (*method2)    (SomeObject *self, gchar*); }; GType    some_object_get_type (); gboolean some_object_method1 (SomeObject *self, gint x,gchar**y,gint *z,GError **);    /* virtual */ void    some_object_method2 (SomeObject *self, gchar*);    /* virtual */ void    some_object_method3 (SomeObject *self, gfloat);    /* non-virtual */ /* Handy macros */ #define SOME_OBJECT_TYPE        (some_object_get_type ()) #define SOME_OBJECT(obj)        (G_TYPE_CHECK_INSTANCE_CAST ((obj), SOME_OBJECT_TYPE, SomeObject)) #define SOME_OBJECT_CLASS(c)        (G_TYPE_CHECK_CLASS_CAST ((c), SOME_OBJECT_TYPE, SomeObjectClass)) #define SOME_IS_OBJECT(obj)        (G_TYPE_CHECK_TYPE ((obj), SOME_OBJECT_TYPE)) #define SOME_IS_OBJECT_CLASS(c)        (G_TYPE_CHECK_CLASS_TYPE ((c), SOME_OBJECT_TYPE)) #define SOME_OBJECT_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), SOME_OBJECT_TYPE, SomeObjectClass)) #endif /* some-object.c */ #include "some-object.h" #include "some-object-glue.h" #include <dbus/dbus-glib-bindings.h> #include <string.h> #include <sys/stat.h> static GObjectClass *parent_class = ((void *)0); static void some_object_init (SomeObject *self); char *FILENAME = NULL; gboolean some_object_method1_impl (SomeObject *self, gint a, gchar **y,gint *z,GError **error) {     struct stat stat_buf;     self->m_a = a;     g_print ("Method1: %i\n", self->m_a); /*        *y = (char *)g_malloc0(6);     strcpy(*y,"sumit"); */            stat(FILENAME,&stat_buf);     *y = g_malloc(stat_buf.st_size + 100);     if(g_file_get_contents(FILENAME,y,z,error))     {         g_print("Contents read\n");         if(g_file_set_contents("copy-server",*y,*z,NULL))             g_print("Contents written\n");     }     else         g_print("Contents reading failed... %s \n",(*error)->message);     return TRUE; } void some_object_method2_impl (SomeObject *self, gchar* b) {     self->m_b = b;     g_print ("Method2: %s\n", self->m_b); } /* Public methods. */ gboolean some_object_method1 (SomeObject *self, gint a,gchar **y,gint *z,GError **error) {     return SOME_OBJECT_GET_CLASS (self)->method1 (self, a,y,z,error); } void    some_object_method2 (SomeObject *self, gchar* b) {     SOME_OBJECT_GET_CLASS (self)->method2 (self, b); } void    some_object_method3 (SomeObject *self, gfloat c) {     self->m_c = c;     g_print ("Method3: %f\n", self->m_c); } void    some_object_dispose (GObject *self) {     static gboolean first_run = TRUE;     if (first_run)     {         first_run = FALSE;                 /* Call g_object_unref on any GObjects that we hold, but don't break the object */         parent_class-> dispose (self);     } } void    some_object_finalize (GObject *self) {     parent_class-> finalize (self); } /* Here is where we override any functions. Since we have no properties or even fields, none of the below are needed. */ void    some_object_class_init        (gpointer g_class, gpointer class_data) {     GObjectClass    *object_class    = G_OBJECT_CLASS (g_class);     SomeObjectClass    *this_class    = SOME_OBJECT_CLASS (g_class);         //assign value to parent class     parent_class = g_type_class_peek_parent (g_class);         //assing pointer values to the base class members     object_class-> dispose = &some_object_dispose;     object_class-> finalize = &some_object_finalize;         //assign value to derived class members     this_class->method1 = &some_object_method1_impl;     this_class->method2 = &some_object_method2_impl;     dbus_g_object_type_install_info(G_TYPE_FROM_CLASS(this_class),&dbus_glib__object_info); } void some_object_init (SomeObject *self) {     self->m_a = 1;     self->m_c = 1.03f;     self->m_b = "sumit"; } GType some_object_get_type () {     static GType g_define_type_id = 0;     if ((g_define_type_id == 0))     {         static const GTypeInfo g_define_type_info =         {             sizeof (SomeObjectClass),             (GBaseInitFunc) ((void *)0),             (GBaseFinalizeFunc) ((void *)0),             (GClassInitFunc) some_object_class_init,             (GClassFinalizeFunc) ((void *)0),             ((void *)0),             sizeof (SomeObject),             0,             (GInstanceInitFunc) some_object_init,         };         g_define_type_id = g_type_register_static         (             G_TYPE_OBJECT,             "SomeObject",             &g_define_type_info,             (GTypeFlags) 0         );             }     return g_define_type_id; } int main(int argc,char *argv[]) {     SomeObject *so = NULL;     DBusGConnection *bus;     g_type_init();     GMainLoop *mainLoop = NULL;     int request_ret;     GError *error = NULL;     DBusGProxy *proxy = NULL;     char *x;     FILENAME = argv[1];     so = g_object_new(SOME_OBJECT_TYPE,NULL);     bus = dbus_g_bus_get(DBUS_BUS_SESSION,NULL);     proxy = dbus_g_proxy_new_for_name(bus,DBUS_SERVICE_DBUS,DBUS_PATH_DBUS,DBUS_INTERFACE_DBUS);     dbus_g_connection_register_g_object(bus,"/com/example/SomeObject",G_OBJECT(so));     if(!org_freedesktop_DBus_request_name(proxy,"com.example.SomeObject",0,&request_ret,&error))     {         g_print("Unable to register service\n");         return 1;     }     mainLoop = g_main_loop_new(NULL,FALSE);     g_main_loop_run(mainLoop);         return 0; } ------------------- End server code -------------- ---------- Client code ------------------- #define DBUS_API_SUBJECT_TO_CHANGE #include <dbus/dbus.h> #include <dbus/dbus-glib.h> #include <stdlib.h> #include <stdio.h> #include "some-object-bindings.h" int main (int argc, char **argv) {   DBusGConnection *connection;   GError *error;   DBusGProxy *proxy;   gchar *x;   gint length;     g_type_init ();   error = NULL;   connection = dbus_g_bus_get (DBUS_BUS_SESSION,                                &error);   if (connection == NULL)     {       g_printerr ("Failed to open connection to bus: %s\n",                   error->message);       g_error_free (error);       exit (1);     }   proxy = dbus_g_proxy_new_for_name (connection,                                      "com.example.SomeObject",                                      "/com/example/SomeObject",                                      "com.example.SomeObject");   error = NULL;   if(!com_example_SomeObject_method1(proxy,10,&x,&length,&error))   {     printf("Error --- %s\n",error->message);     return 1;   }   printf("File details... length = %d\n",length);   error = NULL;   if(!g_file_set_contents("copy-client",x,length,&error))       printf("Error message = %s\n",error->message);     return 0; } ------------ End Client  code ------------- --------- Introspection XML ------------ <?xml version="1.0" encoding="UTF-8" ?> <node name="/com/example/SomeObject">   <interface name="com.example.SomeObject">     <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="some_object"/>     <method name="Method1">              <annotation name="org.freedesktop.DBus.GLib.CSymbol" value="some_object_method1"/>       <arg type="u" name="x" direction="in" />       <arg type="s" name="y" direction="out" />       <arg type="u" name="z" direction="out" />     </method>   </interface> </node> --------- End Introspection XML ------------ Please help. 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