xnu-3247.1.106.tar.gz

[apple/xnu.git] / osfmk / ipc / mach_msg.c

diff --git a/osfmk/ipc/mach_msg.c b/osfmk/ipc/mach_msg.c
index a12c7091944902f024593a116e3c1c52c926c650..98282d7304f4506838bf4c791ccc550f35a26607 100644 (file)
--- a/osfmk/ipc/mach_msg.c
+++ b/osfmk/ipc/mach_msg.c
@@ -335,22 +335,7 @@ mach_msg_receive_results(void)
 
        trailer_size = ipc_kmsg_add_trailer(kmsg, space, option, self, seqno, FALSE, 
                        kmsg->ikm_header->msgh_remote_port->ip_context);
-       /*
-        * If MACH_RCV_OVERWRITE was specified, try to get the scatter
-        * list and verify it against the contents of the message.  If
-        * there is any problem with it, we will continue without it as
-        * normal.
-        */
-       if (option & MACH_RCV_OVERWRITE) {
-               mach_msg_size_t slist_size = self->ith_scatter_list_size;
-               mach_msg_body_t *slist;
-
-               slist = ipc_kmsg_get_scatter(msg_addr, slist_size, kmsg);
-               mr = ipc_kmsg_copyout(kmsg, space, map, slist, option);
-               ipc_kmsg_free_scatter(slist, slist_size);
-       } else {
-               mr = ipc_kmsg_copyout(kmsg, space, map, MACH_MSG_BODY_NULL, option);
-       }
+       mr = ipc_kmsg_copyout(kmsg, space, map, MACH_MSG_BODY_NULL, option);
 
        if (mr != MACH_MSG_SUCCESS) {
                /* already received importance, so have to undo that here */
@@ -401,7 +386,7 @@ mach_msg_receive(
        mach_port_name_t        rcv_name,
        mach_msg_timeout_t      rcv_timeout,
        void                    (*continuation)(mach_msg_return_t),
-       mach_msg_size_t         slist_size)
+       __unused mach_msg_size_t slist_size)
 {
        thread_t self = current_thread();
        ipc_space_t space = current_space();
@@ -419,7 +404,6 @@ mach_msg_receive(
        self->ith_object = object;
        self->ith_msize = rcv_size;
        self->ith_option = option;
-       self->ith_scatter_list_size = slist_size;
        self->ith_continuation = continuation;
 
        ipc_mqueue_receive(mqueue, option, rcv_size, rcv_timeout, THREAD_ABORTSAFE);
@@ -459,7 +443,6 @@ mach_msg_overwrite_trap(
        mach_msg_timeout_t      msg_timeout = args->timeout;
        __unused mach_port_name_t notify = args->notify;
        mach_vm_address_t       rcv_msg_addr = args->rcv_msg;
-        mach_msg_size_t                scatter_list_size = 0; /* NOT INITIALIZED - but not used in pactice */
        __unused mach_port_seqno_t temp_seqno = 0;
 
        mach_msg_return_t  mr = MACH_MSG_SUCCESS;
@@ -506,22 +489,13 @@ mach_msg_overwrite_trap(
                }
                /* hold ref for object */
 
-               /*
-                * 1. MACH_RCV_OVERWRITE is on, and rcv_msg is our scatter list
-                *    and receive buffer
-                * 2. MACH_RCV_OVERWRITE is off, and rcv_msg might be the
-                *    alternate receive buffer (separate send and receive buffers).
-                */
-               if (option & MACH_RCV_OVERWRITE) 
-                       self->ith_msg_addr = rcv_msg_addr;
-               else if (rcv_msg_addr != (mach_vm_address_t)0)
+               if (rcv_msg_addr != (mach_vm_address_t)0)
                        self->ith_msg_addr = rcv_msg_addr;
                else
                        self->ith_msg_addr = msg_addr;
                self->ith_object = object;
                self->ith_msize = rcv_size;
                self->ith_option = option;
-               self->ith_scatter_list_size = scatter_list_size;
                self->ith_receiver_name = MACH_PORT_NULL;
                self->ith_continuation = thread_syscall_return;