/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the
- * License may not be used to create, or enable the creation or
- * redistribution of, unlawful or unlicensed copies of an Apple operating
- * system, or to circumvent, violate, or enable the circumvention or
- * violation of, any terms of an Apple operating system software license
- * agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
* limitations under the License.
- *
- * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_FREE_COPYRIGHT@
*
* Functions to manipulate IPC message queues.
*/
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
+
#include <mach/port.h>
#include <mach/message.h>
#include <ipc/ipc_pset.h>
#include <ipc/ipc_space.h>
-#include <ddb/tr.h>
+#ifdef __LP64__
+#include <vm/vm_map.h>
+#endif
+
+#if CONFIG_MACF_MACH
+#include <security/mac_mach_internal.h>
+#endif
int ipc_mqueue_full; /* address is event for queue space */
int ipc_mqueue_rcv; /* address is event for message arrival */
-#define TR_ENABLE 0
-
/* forward declarations */
void ipc_mqueue_receive_results(wait_result_t result);
boolean_t is_set)
{
if (is_set) {
- wait_queue_set_init(&mqueue->imq_set_queue, SYNC_POLICY_FIFO);
+ wait_queue_set_init(&mqueue->imq_set_queue, SYNC_POLICY_FIFO|SYNC_POLICY_PREPOST);
} else {
wait_queue_init(&mqueue->imq_wait_queue, SYNC_POLICY_FIFO);
ipc_kmsg_queue_init(&mqueue->imq_messages);
kern_return_t
ipc_mqueue_remove(
- ipc_mqueue_t mqueue,
- ipc_mqueue_t set_mqueue)
+ ipc_mqueue_t mqueue,
+ ipc_mqueue_t set_mqueue,
+ wait_queue_link_t *wqlp)
{
wait_queue_t mq_waitq = &mqueue->imq_wait_queue;
wait_queue_set_t set_waitq = &set_mqueue->imq_set_queue;
- return wait_queue_unlink(mq_waitq, set_waitq);
+ return wait_queue_unlink_nofree(mq_waitq, set_waitq, wqlp);
}
/*
*/
void
ipc_mqueue_remove_from_all(
- ipc_mqueue_t mqueue)
+ ipc_mqueue_t mqueue,
+ queue_t links)
{
wait_queue_t mq_waitq = &mqueue->imq_wait_queue;
- wait_queue_unlink_all(mq_waitq);
+ wait_queue_unlink_all_nofree(mq_waitq, links);
return;
}
*/
void
ipc_mqueue_remove_all(
- ipc_mqueue_t mqueue)
+ ipc_mqueue_t mqueue,
+ queue_t links)
{
wait_queue_set_t mq_setq = &mqueue->imq_set_queue;
- wait_queue_set_unlink_all(mq_setq);
+ wait_queue_set_unlink_all_nofree(mq_setq, links);
return;
}
kern_return_t
ipc_mqueue_add(
ipc_mqueue_t port_mqueue,
- ipc_mqueue_t set_mqueue)
+ ipc_mqueue_t set_mqueue,
+ wait_queue_link_t wql)
{
wait_queue_t port_waitq = &port_mqueue->imq_wait_queue;
wait_queue_set_t set_waitq = &set_mqueue->imq_set_queue;
kern_return_t kr;
spl_t s;
- kr = wait_queue_link(port_waitq, set_waitq);
+ kr = wait_queue_link_noalloc(port_waitq, set_waitq, wql);
if (kr != KERN_SUCCESS)
return kr;
for (;;) {
thread_t th;
+ mach_msg_size_t msize;
th = wait_queue_wakeup64_identity_locked(
port_waitq,
if (th == THREAD_NULL)
goto leave;
+ /*
+ * If the receiver waited with a facility not directly
+ * related to Mach messaging, then it isn't prepared to get
+ * handed the message directly. Just set it running, and
+ * go look for another thread that can.
+ */
+ if (th->ith_state != MACH_RCV_IN_PROGRESS) {
+ thread_unlock(th);
+ continue;
+ }
+
/*
* Found a receiver. see if they can handle the message
* correctly (the message is not too large for them, or
* the list and let them go back and figure it out and
* just move onto the next.
*/
+ msize = ipc_kmsg_copyout_size(kmsg, th->map);
if (th->ith_msize <
- kmsg->ikm_header->msgh_size +
- REQUESTED_TRAILER_SIZE(th->ith_option)) {
+ (msize + REQUESTED_TRAILER_SIZE(thread_is_64bit(th), th->ith_option))) {
th->ith_state = MACH_RCV_TOO_LARGE;
- th->ith_msize = kmsg->ikm_header->msgh_size;
+ th->ith_msize = msize;
if (th->ith_option & MACH_RCV_LARGE) {
/*
* let him go without message
*/
+ th->ith_receiver_name = port_mqueue->imq_receiver_name;
th->ith_kmsg = IKM_NULL;
th->ith_seqno = 0;
thread_unlock(th);
* the message and must do something with it. If successful,
* the message is queued, given to a receiver, or destroyed.
* Conditions:
- * Nothing locked.
+ * mqueue is locked.
* Returns:
* MACH_MSG_SUCCESS The message was accepted.
* MACH_SEND_TIMED_OUT Caller still has message.
mach_msg_return_t
ipc_mqueue_send(
ipc_mqueue_t mqueue,
- ipc_kmsg_t kmsg,
+ ipc_kmsg_t kmsg,
mach_msg_option_t option,
- mach_msg_timeout_t send_timeout)
+ mach_msg_timeout_t send_timeout,
+ spl_t s)
{
int wresult;
- spl_t s;
/*
* Don't block if:
* 2) Caller used the MACH_SEND_ALWAYS internal option.
* 3) Message is sent to a send-once right.
*/
- s = splsched();
- imq_lock(mqueue);
-
if (!imq_full(mqueue) ||
- (option & MACH_SEND_ALWAYS) ||
- (MACH_MSGH_BITS_REMOTE(kmsg->ikm_header->msgh_bits) ==
- MACH_MSG_TYPE_PORT_SEND_ONCE)) {
+ (!imq_full_kernel(mqueue) &&
+ ((option & MACH_SEND_ALWAYS) ||
+ (MACH_MSGH_BITS_REMOTE(kmsg->ikm_header->msgh_bits) ==
+ MACH_MSG_TYPE_PORT_SEND_ONCE)))) {
mqueue->imq_msgcount++;
assert(mqueue->imq_msgcount > 0);
imq_unlock(mqueue);
splx(s);
return MACH_SEND_TIMED_OUT;
}
+ if (imq_full_kernel(mqueue)) {
+ imq_unlock(mqueue);
+ splx(s);
+ return MACH_SEND_NO_BUFFER;
+ }
mqueue->imq_fullwaiters = TRUE;
thread_lock(cur_thread);
if (option & MACH_SEND_TIMEOUT)
wresult = wait_queue_assert_wait64_locked(
&mqueue->imq_wait_queue,
IPC_MQUEUE_FULL,
- THREAD_ABORTSAFE, deadline,
+ THREAD_ABORTSAFE,
+ TIMEOUT_URGENCY_USER_NORMAL,
+ deadline, 0,
cur_thread);
thread_unlock(cur_thread);
imq_unlock(mqueue);
return MACH_SEND_INTERRUPTED;
case THREAD_RESTART:
+ /* mqueue is being destroyed */
+ return MACH_SEND_INVALID_DEST;
default:
panic("ipc_mqueue_send");
}
return MACH_MSG_SUCCESS;
}
+
/*
* Routine: ipc_mqueue_release_msgcount
* Purpose:
register ipc_mqueue_t mqueue,
register ipc_kmsg_t kmsg)
{
-
spl_t s;
/*
for (;;) {
wait_queue_t waitq = &mqueue->imq_wait_queue;
thread_t receiver;
+ mach_msg_size_t msize;
receiver = wait_queue_wakeup64_identity_locked(
waitq,
ipc_kmsg_enqueue_macro(&mqueue->imq_messages, kmsg);
break;
}
-
+
+ /*
+ * If the receiver waited with a facility not directly
+ * related to Mach messaging, then it isn't prepared to get
+ * handed the message directly. Just set it running, and
+ * go look for another thread that can.
+ */
+ if (receiver->ith_state != MACH_RCV_IN_PROGRESS) {
+ thread_unlock(receiver);
+ continue;
+ }
+
+
/*
* We found a waiting thread.
* If the message is too large or the scatter list is too small
* the thread we wake up will get that as its status.
*/
+ msize = ipc_kmsg_copyout_size(kmsg, receiver->map);
if (receiver->ith_msize <
- (kmsg->ikm_header->msgh_size) +
- REQUESTED_TRAILER_SIZE(receiver->ith_option)) {
- receiver->ith_msize = kmsg->ikm_header->msgh_size;
+ (msize + REQUESTED_TRAILER_SIZE(thread_is_64bit(receiver), receiver->ith_option))) {
+ receiver->ith_msize = msize;
receiver->ith_state = MACH_RCV_TOO_LARGE;
} else {
receiver->ith_state = MACH_MSG_SUCCESS;
* and handle its error without getting the message. We
* need to go back and pick another one.
*/
+ receiver->ith_receiver_name = mqueue->imq_receiver_name;
receiver->ith_kmsg = IKM_NULL;
receiver->ith_seqno = 0;
thread_unlock(receiver);
{
thread_t self = current_thread();
mach_msg_option_t option = self->ith_option;
- kern_return_t mr;
/*
* why did we wake up?
* We do not need to go select a message, somebody
* handed us one (or a too-large indication).
*/
- mr = MACH_MSG_SUCCESS;
-
switch (self->ith_state) {
case MACH_RCV_SCATTER_SMALL:
case MACH_RCV_TOO_LARGE:
void
ipc_mqueue_receive(
- ipc_mqueue_t mqueue,
- mach_msg_option_t option,
- mach_msg_size_t max_size,
- mach_msg_timeout_t rcv_timeout,
- int interruptible)
+ ipc_mqueue_t mqueue,
+ mach_msg_option_t option,
+ mach_msg_size_t max_size,
+ mach_msg_timeout_t rcv_timeout,
+ int interruptible)
+{
+ wait_result_t wresult;
+ thread_t self = current_thread();
+
+ wresult = ipc_mqueue_receive_on_thread(mqueue, option, max_size,
+ rcv_timeout, interruptible,
+ self);
+ if (wresult == THREAD_NOT_WAITING)
+ return;
+
+ if (wresult == THREAD_WAITING) {
+ counter((interruptible == THREAD_ABORTSAFE) ?
+ c_ipc_mqueue_receive_block_user++ :
+ c_ipc_mqueue_receive_block_kernel++);
+
+ if (self->ith_continuation)
+ thread_block(ipc_mqueue_receive_continue);
+ /* NOTREACHED */
+
+ wresult = thread_block(THREAD_CONTINUE_NULL);
+ }
+ ipc_mqueue_receive_results(wresult);
+}
+
+wait_result_t
+ipc_mqueue_receive_on_thread(
+ ipc_mqueue_t mqueue,
+ mach_msg_option_t option,
+ mach_msg_size_t max_size,
+ mach_msg_timeout_t rcv_timeout,
+ int interruptible,
+ thread_t thread)
{
ipc_kmsg_queue_t kmsgs;
wait_result_t wresult;
- thread_t self;
- uint64_t deadline;
+ uint64_t deadline;
spl_t s;
+#if CONFIG_MACF_MACH
+ ipc_labelh_t lh;
+ task_t task;
+ int rc;
+#endif
s = splsched();
imq_lock(mqueue);
if (imq_is_set(mqueue)) {
- wait_queue_link_t wql;
- ipc_mqueue_t port_mq;
queue_t q;
- q = &mqueue->imq_setlinks;
+ q = &mqueue->imq_preposts;
/*
* If we are waiting on a portset mqueue, we need to see if
- * any of the member ports have work for us. If so, try to
- * deliver one of those messages. By holding the portset's
+ * any of the member ports have work for us. Ports that
+ * have (or recently had) messages will be linked in the
+ * prepost queue for the portset. By holding the portset's
* mqueue lock during the search, we tie up any attempts by
* mqueue_deliver or portset membership changes that may
- * cross our path. But this is a lock order violation, so we
- * have to do it "softly." If we don't find a message waiting
- * for us, we will assert our intention to wait while still
- * holding that lock. When we release the lock, the deliver/
- * change will succeed and find us.
+ * cross our path.
*/
search_set:
- queue_iterate(q, wql, wait_queue_link_t, wql_setlinks) {
+ while(!queue_empty(q)) {
+ wait_queue_link_t wql;
+ ipc_mqueue_t port_mq;
+
+ queue_remove_first(q, wql, wait_queue_link_t, wql_preposts);
+ assert(!wql_is_preposted(wql));
+
+ /*
+ * This is a lock order violation, so we have to do it
+ * "softly," putting the link back on the prepost list
+ * if it fails (at the tail is fine since the order of
+ * handling messages from different sources in a set is
+ * not guaranteed and we'd like to skip to the next source
+ * if one is available).
+ */
port_mq = (ipc_mqueue_t)wql->wql_queue;
- kmsgs = &port_mq->imq_messages;
-
if (!imq_lock_try(port_mq)) {
+ queue_enter(q, wql, wait_queue_link_t, wql_preposts);
imq_unlock(mqueue);
splx(s);
- delay(1);
+ mutex_pause(0);
s = splsched();
imq_lock(mqueue);
goto search_set; /* start again at beginning - SMP */
}
/*
- * If there is still a message to be had, we will
- * try to select it (may not succeed because of size
- * and options). In any case, we deliver those
- * results back to the user.
- *
- * We also move the port's linkage to the tail of the
- * list for this set (fairness). Future versions will
- * sort by timestamp or priority.
+ * If there are no messages on this queue, just skip it
+ * (we already removed the link from the set's prepost queue).
*/
+ kmsgs = &port_mq->imq_messages;
if (ipc_kmsg_queue_first(kmsgs) == IKM_NULL) {
imq_unlock(port_mq);
continue;
}
- queue_remove(q, wql, wait_queue_link_t, wql_setlinks);
- queue_enter(q, wql, wait_queue_link_t, wql_setlinks);
+
+ /*
+ * There are messages, so reinsert the link back
+ * at the tail of the preposted queue (for fairness)
+ * while we still have the portset mqueue locked.
+ */
+ queue_enter(q, wql, wait_queue_link_t, wql_preposts);
imq_unlock(mqueue);
- ipc_mqueue_select(port_mq, option, max_size);
+ /*
+ * Continue on to handling the message with just
+ * the port mqueue locked.
+ */
+ ipc_mqueue_select_on_thread(port_mq, option, max_size, thread);
imq_unlock(port_mq);
+#if CONFIG_MACF_MACH
+ if (thread->task != TASK_NULL &&
+ thread->ith_kmsg != NULL &&
+ thread->ith_kmsg->ikm_sender != NULL) {
+ lh = thread->ith_kmsg->ikm_sender->label;
+ tasklabel_lock(thread->task);
+ ip_lock(lh->lh_port);
+ rc = mac_port_check_receive(&thread->task->maclabel,
+ &lh->lh_label);
+ ip_unlock(lh->lh_port);
+ tasklabel_unlock(thread->task);
+ if (rc)
+ thread->ith_state = MACH_RCV_INVALID_DATA;
+ }
+#endif
splx(s);
- return;
+ return THREAD_NOT_WAITING;
}
*/
kmsgs = &mqueue->imq_messages;
if (ipc_kmsg_queue_first(kmsgs) != IKM_NULL) {
- ipc_mqueue_select(mqueue, option, max_size);
+ ipc_mqueue_select_on_thread(mqueue, option, max_size, thread);
imq_unlock(mqueue);
+#if CONFIG_MACF_MACH
+ if (thread->task != TASK_NULL &&
+ thread->ith_kmsg != NULL &&
+ thread->ith_kmsg->ikm_sender != NULL) {
+ lh = thread->ith_kmsg->ikm_sender->label;
+ tasklabel_lock(thread->task);
+ ip_lock(lh->lh_port);
+ rc = mac_port_check_receive(&thread->task->maclabel,
+ &lh->lh_label);
+ ip_unlock(lh->lh_port);
+ tasklabel_unlock(thread->task);
+ if (rc)
+ thread->ith_state = MACH_RCV_INVALID_DATA;
+ }
+#endif
splx(s);
- return;
+ return THREAD_NOT_WAITING;
}
}
-
+
/*
* Looks like we'll have to block. The mqueue we will
* block on (whether the set's or the local port's) is
* still locked.
*/
- self = current_thread();
if (option & MACH_RCV_TIMEOUT) {
if (rcv_timeout == 0) {
imq_unlock(mqueue);
splx(s);
- self->ith_state = MACH_RCV_TIMED_OUT;
- return;
+ thread->ith_state = MACH_RCV_TIMED_OUT;
+ return THREAD_NOT_WAITING;
}
}
- thread_lock(self);
- self->ith_state = MACH_RCV_IN_PROGRESS;
- self->ith_option = option;
- self->ith_msize = max_size;
+ thread_lock(thread);
+ thread->ith_state = MACH_RCV_IN_PROGRESS;
+ thread->ith_option = option;
+ thread->ith_msize = max_size;
if (option & MACH_RCV_TIMEOUT)
clock_interval_to_deadline(rcv_timeout, 1000*NSEC_PER_USEC, &deadline);
deadline = 0;
wresult = wait_queue_assert_wait64_locked(&mqueue->imq_wait_queue,
- IPC_MQUEUE_RECEIVE,
- interruptible, deadline,
- self);
- thread_unlock(self);
+ IPC_MQUEUE_RECEIVE,
+ interruptible,
+ TIMEOUT_URGENCY_USER_NORMAL,
+ deadline, 0,
+ thread);
+ /* preposts should be detected above, not here */
+ if (wresult == THREAD_AWAKENED)
+ panic("ipc_mqueue_receive_on_thread: sleep walking");
+
+ thread_unlock(thread);
imq_unlock(mqueue);
splx(s);
-
- if (wresult == THREAD_WAITING) {
- counter((interruptible == THREAD_ABORTSAFE) ?
- c_ipc_mqueue_receive_block_user++ :
- c_ipc_mqueue_receive_block_kernel++);
-
- if (self->ith_continuation)
- thread_block(ipc_mqueue_receive_continue);
- /* NOTREACHED */
-
- wresult = thread_block(THREAD_CONTINUE_NULL);
- }
- ipc_mqueue_receive_results(wresult);
+ return wresult;
}
/*
- * Routine: ipc_mqueue_select
+ * Routine: ipc_mqueue_select_on_thread
* Purpose:
* A receiver discovered that there was a message on the queue
* before he had to block. Pick the message off the queue and
- * "post" it to himself.
+ * "post" it to thread.
* Conditions:
* mqueue locked.
+ * thread not locked.
* There is a message.
* Returns:
* MACH_MSG_SUCCESS Actually selected a message for ourselves.
* MACH_RCV_TOO_LARGE May or may not have pull it, but it is large
*/
void
-ipc_mqueue_select(
+ipc_mqueue_select_on_thread(
ipc_mqueue_t mqueue,
mach_msg_option_t option,
- mach_msg_size_t max_size)
+ mach_msg_size_t max_size,
+ thread_t thread)
{
- thread_t self = current_thread();
ipc_kmsg_t kmsg;
- mach_msg_return_t mr;
+ mach_msg_return_t mr = MACH_MSG_SUCCESS;
mach_msg_size_t rcv_size;
- mr = MACH_MSG_SUCCESS;
-
-
/*
* Do some sanity checking of our ability to receive
* before pulling the message off the queue.
* the queue, instead return the appropriate error
* (and size needed).
*/
- rcv_size = ipc_kmsg_copyout_size(kmsg, self->map);
- if (rcv_size + REQUESTED_TRAILER_SIZE(option) > max_size) {
+ rcv_size = ipc_kmsg_copyout_size(kmsg, thread->map);
+ if (rcv_size + REQUESTED_TRAILER_SIZE(thread_is_64bit(thread), option) > max_size) {
mr = MACH_RCV_TOO_LARGE;
if (option & MACH_RCV_LARGE) {
- self->ith_kmsg = IKM_NULL;
- self->ith_msize = rcv_size;
- self->ith_seqno = 0;
- self->ith_state = mr;
+ thread->ith_receiver_name = mqueue->imq_receiver_name;
+ thread->ith_kmsg = IKM_NULL;
+ thread->ith_msize = rcv_size;
+ thread->ith_seqno = 0;
+ thread->ith_state = mr;
return;
}
}
ipc_kmsg_rmqueue_first_macro(&mqueue->imq_messages, kmsg);
ipc_mqueue_release_msgcount(mqueue);
- self->ith_seqno = mqueue->imq_seqno++;
- self->ith_kmsg = kmsg;
- self->ith_state = mr;
+ thread->ith_seqno = mqueue->imq_seqno++;
+ thread->ith_kmsg = kmsg;
+ thread->ith_state = mr;
current_task()->messages_received++;
return;
}
+/*
+ * Routine: ipc_mqueue_peek
+ * Purpose:
+ * Peek at a (non-set) message queue to see if it has a message
+ * matching the sequence number provided (if zero, then the
+ * first message in the queue) and return vital info about the
+ * message.
+ *
+ * Conditions:
+ * Locks may be held by callers, so this routine cannot block.
+ * Caller holds reference on the message queue.
+ */
+unsigned
+ipc_mqueue_peek(ipc_mqueue_t mq,
+ mach_port_seqno_t *seqnop,
+ mach_msg_size_t *msg_sizep,
+ mach_msg_id_t *msg_idp,
+ mach_msg_max_trailer_t *msg_trailerp)
+{
+ ipc_kmsg_queue_t kmsgq;
+ ipc_kmsg_t kmsg;
+ mach_port_seqno_t seqno, msgoff;
+ int res = 0;
+ spl_t s;
+
+ assert(!imq_is_set(mq));
+
+ s = splsched();
+ imq_lock(mq);
+
+ seqno = (seqnop != NULL) ? seqno = *seqnop : 0;
+
+ if (seqno == 0) {
+ seqno = mq->imq_seqno;
+ msgoff = 0;
+ } else if (seqno >= mq->imq_seqno &&
+ seqno < mq->imq_seqno + mq->imq_msgcount) {
+ msgoff = seqno - mq->imq_seqno;
+ } else
+ goto out;
+
+ /* look for the message that would match that seqno */
+ kmsgq = &mq->imq_messages;
+ kmsg = ipc_kmsg_queue_first(kmsgq);
+ while (msgoff-- && kmsg != IKM_NULL) {
+ kmsg = ipc_kmsg_queue_next(kmsgq, kmsg);
+ }
+ if (kmsg == IKM_NULL)
+ goto out;
+
+ /* found one - return the requested info */
+ if (seqnop != NULL)
+ *seqnop = seqno;
+ if (msg_sizep != NULL)
+ *msg_sizep = kmsg->ikm_header->msgh_size;
+ if (msg_idp != NULL)
+ *msg_idp = kmsg->ikm_header->msgh_id;
+ if (msg_trailerp != NULL)
+ memcpy(msg_trailerp,
+ (mach_msg_max_trailer_t *)((vm_offset_t)kmsg->ikm_header +
+ round_msg(kmsg->ikm_header->msgh_size)),
+ sizeof(mach_msg_max_trailer_t));
+ res = 1;
+
+ out:
+ imq_unlock(mq);
+ splx(s);
+ return res;
+}
+
+/*
+ * Routine: ipc_mqueue_set_peek
+ * Purpose:
+ * Peek at a message queue set to see if it has any ports
+ * with messages.
+ *
+ * Conditions:
+ * Locks may be held by callers, so this routine cannot block.
+ * Caller holds reference on the message queue.
+ */
+unsigned
+ipc_mqueue_set_peek(ipc_mqueue_t mq)
+{
+ wait_queue_link_t wql;
+ queue_t q;
+ spl_t s;
+ int res;
+
+ assert(imq_is_set(mq));
+
+ s = splsched();
+ imq_lock(mq);
+
+ /*
+ * peek at the contained port message queues, return as soon as
+ * we spot a message on one of the message queues linked on the
+ * prepost list. No need to lock each message queue, as only the
+ * head of each queue is checked. If a message wasn't there before
+ * we entered here, no need to find it (if we do, great).
+ */
+ res = 0;
+ q = &mq->imq_preposts;
+ queue_iterate(q, wql, wait_queue_link_t, wql_preposts) {
+ ipc_mqueue_t port_mq = (ipc_mqueue_t)wql->wql_queue;
+ ipc_kmsg_queue_t kmsgs = &port_mq->imq_messages;
+
+ if (ipc_kmsg_queue_first(kmsgs) != IKM_NULL) {
+ res = 1;
+ break;
+ }
+ }
+ imq_unlock(mq);
+ splx(s);
+ return res;
+}
+
+/*
+ * Routine: ipc_mqueue_set_gather_member_names
+ * Purpose:
+ * Iterate a message queue set to identify the member port
+ * names. Actual returned names is limited to maxnames entries,
+ * but we keep counting the actual number of members to let
+ * the caller decide to retry if necessary.
+ *
+ * Conditions:
+ * Locks may be held by callers, so this routine cannot block.
+ * Caller holds reference on the message queue.
+ */
+void
+ipc_mqueue_set_gather_member_names(
+ ipc_mqueue_t mq,
+ ipc_entry_num_t maxnames,
+ mach_port_name_t *names,
+ ipc_entry_num_t *actualp)
+{
+ wait_queue_link_t wql;
+ queue_t q;
+ spl_t s;
+ ipc_entry_num_t actual = 0;
+
+ assert(imq_is_set(mq));
+
+ s = splsched();
+ imq_lock(mq);
+
+ /*
+ * Iterate over the member ports through the mqueue set links
+ * capturing as many names as we can.
+ */
+ q = &mq->imq_setlinks;
+ queue_iterate(q, wql, wait_queue_link_t, wql_setlinks) {
+ ipc_mqueue_t port_mq = (ipc_mqueue_t)wql->wql_queue;
+
+ if (actual < maxnames)
+ names[actual] = port_mq->imq_receiver_name;
+ actual++;
+ }
+ imq_unlock(mq);
+ splx(s);
+
+ *actualp = actual;
+}
+
+
/*
* Routine: ipc_mqueue_destroy
* Purpose:
- * Destroy a message queue. Set any blocked senders running.
+ * Destroy a (non-set) message queue.
+ * Set any blocked senders running.
* Destroy the kmsgs in the queue.
* Conditions:
* Nothing locked.
*/
void
ipc_mqueue_destroy(
- ipc_mqueue_t mqueue)
+ ipc_mqueue_t mqueue)
{
ipc_kmsg_queue_t kmqueue;
ipc_kmsg_t kmsg;
+ boolean_t reap = FALSE;
spl_t s;
-
s = splsched();
imq_lock(mqueue);
/*
wait_queue_wakeup64_all_locked(
&mqueue->imq_wait_queue,
IPC_MQUEUE_FULL,
- THREAD_AWAKENED,
+ THREAD_RESTART,
FALSE);
+ /*
+ * Move messages from the specified queue to the per-thread
+ * clean/drain queue while we have the mqueue lock.
+ */
kmqueue = &mqueue->imq_messages;
-
while ((kmsg = ipc_kmsg_dequeue(kmqueue)) != IKM_NULL) {
- imq_unlock(mqueue);
- splx(s);
-
- ipc_kmsg_destroy_dest(kmsg);
-
- s = splsched();
- imq_lock(mqueue);
+ boolean_t first;
+ first = ipc_kmsg_delayed_destroy(kmsg);
+ if (first)
+ reap = first;
}
+
imq_unlock(mqueue);
splx(s);
+
+ /*
+ * Destroy the messages we enqueued if we aren't nested
+ * inside some other attempt to drain the same queue.
+ */
+ if (reap)
+ ipc_kmsg_reap_delayed();
}
/*
ipc_mqueue_t mqueue;
is_read_lock(space);
- if (!space->is_active) {
+ if (!is_active(space)) {
is_read_unlock(space);
return MACH_RCV_INVALID_NAME;
}
projects / apple / xnu.git / blobdiff