Reorganize source tree to use single autotools instance

Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 852 insertions, 0 deletions

diff --git a/src/vlibmemory/memory_shared.c b/src/vlibmemory/memory_shared.c
new file mode 100644
index 00000000000..d8d3200485e
--- /dev/null
+++ b/src/vlibmemory/memory_shared.c
@@ -0,0 +1,852 @@
+/*
+ *------------------------------------------------------------------
+ * memclnt_shared.c - API message handling, common code for both clients
+ * and the vlib process itself.
+ *
+ *
+ * Copyright (c) 2009 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <vppinfra/format.h>
+#include <vppinfra/byte_order.h>
+#include <vppinfra/error.h>
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vlibmemory/api.h>
+#include <vlibmemory/unix_shared_memory_queue.h>
+
+#include <vlibmemory/vl_memory_msg_enum.h>
+
+#define vl_typedefs
+#include <vlibmemory/vl_memory_api_h.h>
+#undef vl_typedefs
+
+static inline void *
+vl_msg_api_alloc_internal (int nbytes, int pool, int may_return_null)
+{
+  int i;
+  msgbuf_t *rv;
+  ring_alloc_t *ap;
+  unix_shared_memory_queue_t *q;
+  void *oldheap;
+  vl_shmem_hdr_t *shmem_hdr;
+  api_main_t *am = &api_main;
+
+  shmem_hdr = am->shmem_hdr;
+
+  if (shmem_hdr == 0)
+    {
+      clib_warning ("shared memory header NULL");
+      return 0;
+    }
+
+  /* account for the msgbuf_t header */
+  nbytes += sizeof (msgbuf_t);
+
+  if (shmem_hdr->vl_rings == 0)
+    {
+      clib_warning ("vl_rings NULL");
+      ASSERT (0);
+      abort ();
+    }
+
+  if (shmem_hdr->client_rings == 0)
+    {
+      clib_warning ("client_rings NULL");
+      ASSERT (0);
+      abort ();
+    }
+
+  ap = pool ? shmem_hdr->vl_rings : shmem_hdr->client_rings;
+  for (i = 0; i < vec_len (ap); i++)
+    {
+      /* Too big? */
+      if (nbytes > ap[i].size)
+	{
+	  continue;
+	}
+
+      q = ap[i].rp;
+      if (pool == 0)
+	{
+	  pthread_mutex_lock (&q->mutex);
+	}
+      rv = (msgbuf_t *) (&q->data[0] + q->head * q->elsize);
+      /*
+       * Is this item still in use?
+       */
+      if (rv->q)
+	{
+	  /* yes, loser; try next larger pool */
+	  ap[i].misses++;
+	  if (pool == 0)
+	    pthread_mutex_unlock (&q->mutex);
+	  continue;
+	}
+      /* OK, we have a winner */
+      ap[i].hits++;
+      /*
+       * Remember the source queue, although we
+       * don't need to know the queue to free the item.
+       */
+      rv->q = q;
+      q->head++;
+      if (q->head == q->maxsize)
+	q->head = 0;
+
+      if (pool == 0)
+	pthread_mutex_unlock (&q->mutex);
+      goto out;
+    }
+
+  /*
+   * Request too big, or head element of all size-compatible rings
+   * still in use. Fall back to shared-memory malloc.
+   */
+  am->ring_misses++;
+
+  pthread_mutex_lock (&am->vlib_rp->mutex);
+  oldheap = svm_push_data_heap (am->vlib_rp);
+  if (may_return_null)
+    {
+      rv = clib_mem_alloc_or_null (nbytes);
+      if (PREDICT_FALSE (rv == 0))
+	{
+	  svm_pop_heap (oldheap);
+	  pthread_mutex_unlock (&am->vlib_rp->mutex);
+	  return 0;
+	}
+    }
+  else
+    rv = clib_mem_alloc (nbytes);
+
+  rv->q = 0;
+  svm_pop_heap (oldheap);
+  pthread_mutex_unlock (&am->vlib_rp->mutex);
+
+out:
+  rv->data_len = htonl (nbytes - sizeof (msgbuf_t));
+  return (rv->data);
+}
+
+void *
+vl_msg_api_alloc (int nbytes)
+{
+  int pool;
+  api_main_t *am = &api_main;
+  vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
+
+  /*
+   * Clients use pool-0, vlib proc uses pool 1
+   */
+  pool = (am->our_pid == shmem_hdr->vl_pid);
+  return vl_msg_api_alloc_internal (nbytes, pool, 0 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_or_null (int nbytes)
+{
+  int pool;
+  api_main_t *am = &api_main;
+  vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
+
+  pool = (am->our_pid == shmem_hdr->vl_pid);
+  return vl_msg_api_alloc_internal (nbytes, pool, 1 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_as_if_client (int nbytes)
+{
+  return vl_msg_api_alloc_internal (nbytes, 0, 0 /* may_return_null */ );
+}
+
+void *
+vl_msg_api_alloc_as_if_client_or_null (int nbytes)
+{
+  return vl_msg_api_alloc_internal (nbytes, 0, 1 /* may_return_null */ );
+}
+
+void
+vl_msg_api_free (void *a)
+{
+  msgbuf_t *rv;
+  void *oldheap;
+  api_main_t *am = &api_main;
+
+  rv = (msgbuf_t *) (((u8 *) a) - offsetof (msgbuf_t, data));
+
+  /*
+   * Here's the beauty of the scheme.  Only one proc/thread has
+   * control of a given message buffer. To free a buffer, we just clear the
+   * queue field, and leave. No locks, no hits, no errors...
+   */
+  if (rv->q)
+    {
+      rv->q = 0;
+      return;
+    }
+
+  pthread_mutex_lock (&am->vlib_rp->mutex);
+  oldheap = svm_push_data_heap (am->vlib_rp);
+  clib_mem_free (rv);
+  svm_pop_heap (oldheap);
+  pthread_mutex_unlock (&am->vlib_rp->mutex);
+}
+
+static void
+vl_msg_api_free_nolock (void *a)
+{
+  msgbuf_t *rv;
+  void *oldheap;
+  api_main_t *am = &api_main;
+
+  rv = (msgbuf_t *) (((u8 *) a) - offsetof (msgbuf_t, data));
+  /*
+   * Here's the beauty of the scheme.  Only one proc/thread has
+   * control of a given message buffer. To free a buffer, we just clear the
+   * queue field, and leave. No locks, no hits, no errors...
+   */
+  if (rv->q)
+    {
+      rv->q = 0;
+      return;
+    }
+
+  oldheap = svm_push_data_heap (am->vlib_rp);
+  clib_mem_free (rv);
+  svm_pop_heap (oldheap);
+}
+
+void
+vl_set_memory_root_path (char *name)
+{
+  api_main_t *am = &api_main;
+
+  am->root_path = name;
+}
+
+void
+vl_set_memory_uid (int uid)
+{
+  api_main_t *am = &api_main;
+
+  am->api_uid = uid;
+}
+
+void
+vl_set_memory_gid (int gid)
+{
+  api_main_t *am = &api_main;
+
+  am->api_gid = gid;
+}
+
+void
+vl_set_global_memory_baseva (u64 baseva)
+{
+  api_main_t *am = &api_main;
+
+  am->global_baseva = baseva;
+}
+
+void
+vl_set_global_memory_size (u64 size)
+{
+  api_main_t *am = &api_main;
+
+  am->global_size = size;
+}
+
+void
+vl_set_api_memory_size (u64 size)
+{
+  api_main_t *am = &api_main;
+
+  am->api_size = size;
+}
+
+void
+vl_set_global_pvt_heap_size (u64 size)
+{
+  api_main_t *am = &api_main;
+
+  am->global_pvt_heap_size = size;
+}
+
+void
+vl_set_api_pvt_heap_size (u64 size)
+{
+  api_main_t *am = &api_main;
+
+  am->api_pvt_heap_size = size;
+}
+
+int
+vl_map_shmem (char *region_name, int is_vlib)
+{
+  svm_map_region_args_t _a, *a = &_a;
+  svm_region_t *vlib_rp, *root_rp;
+  void *oldheap;
+  vl_shmem_hdr_t *shmem_hdr = 0;
+  api_main_t *am = &api_main;
+  int i;
+  struct timespec ts, tsrem;
+
+  if (is_vlib == 0)
+    svm_region_init_chroot (am->root_path);
+
+  memset (a, 0, sizeof (*a));
+
+  a->name = region_name;
+  a->size = am->api_size ? am->api_size : (16 << 20);
+  a->flags = SVM_FLAGS_MHEAP;
+  a->uid = am->api_uid;
+  a->gid = am->api_gid;
+  a->pvt_heap_size = am->api_pvt_heap_size;
+
+  vlib_rp = svm_region_find_or_create (a);
+
+  if (vlib_rp == 0)
+    return (-2);
+
+  pthread_mutex_lock (&vlib_rp->mutex);
+  /* Has someone else set up the shared-memory variable table? */
+  if (vlib_rp->user_ctx)
+    {
+      am->shmem_hdr = (void *) vlib_rp->user_ctx;
+      am->our_pid = getpid ();
+      if (is_vlib)
+	{
+	  unix_shared_memory_queue_t *q;
+	  uword old_msg;
+	  /*
+	   * application restart. Reset cached pids, API message
+	   * rings, list of clients; otherwise, various things
+	   * fail. (e.g. queue non-empty notification)
+	   */
+
+	  /* ghosts keep the region from disappearing properly */
+	  svm_client_scan_this_region_nolock (vlib_rp);
+	  am->shmem_hdr->application_restarts++;
+	  q = am->shmem_hdr->vl_input_queue;
+	  am->shmem_hdr->vl_pid = getpid ();
+	  q->consumer_pid = am->shmem_hdr->vl_pid;
+	  /* Drain the input queue, freeing msgs */
+	  for (i = 0; i < 10; i++)
+	    {
+	      if (pthread_mutex_trylock (&q->mutex) == 0)
+		{
+		  pthread_mutex_unlock (&q->mutex);
+		  goto mutex_ok;
+		}
+	      ts.tv_sec = 0;
+	      ts.tv_nsec = 10000 * 1000;	/* 10 ms */
+	      while (nanosleep (&ts, &tsrem) < 0)
+		ts = tsrem;
+	    }
+	  /* Mutex buggered, "fix" it */
+	  memset (&q->mutex, 0, sizeof (q->mutex));
+	  clib_warning ("forcibly release main input queue mutex");
+
+	mutex_ok:
+	  am->vlib_rp = vlib_rp;
+	  while (unix_shared_memory_queue_sub (q,
+					       (u8 *) & old_msg,
+					       1 /* nowait */ )
+		 != -2 /* queue underflow */ )
+	    {
+	      vl_msg_api_free_nolock ((void *) old_msg);
+	      am->shmem_hdr->restart_reclaims++;
+	    }
+	  pthread_mutex_unlock (&vlib_rp->mutex);
+	  root_rp = svm_get_root_rp ();
+	  ASSERT (root_rp);
+	  /* Clean up the root region client list */
+	  pthread_mutex_lock (&root_rp->mutex);
+	  svm_client_scan_this_region_nolock (root_rp);
+	  pthread_mutex_unlock (&root_rp->mutex);
+	}
+      else
+	{
+	  pthread_mutex_unlock (&vlib_rp->mutex);
+	}
+      am->vlib_rp = vlib_rp;
+      vec_add1 (am->mapped_shmem_regions, vlib_rp);
+      return 0;
+    }
+  /* Clients simply have to wait... */
+  if (!is_vlib)
+    {
+      pthread_mutex_unlock (&vlib_rp->mutex);
+
+      /* Wait up to 100 seconds... */
+      for (i = 0; i < 10000; i++)
+	{
+	  ts.tv_sec = 0;
+	  ts.tv_nsec = 10000 * 1000;	/* 10 ms */
+	  while (nanosleep (&ts, &tsrem) < 0)
+	    ts = tsrem;
+	  if (vlib_rp->user_ctx)
+	    goto ready;
+	}
+      /* Clean up and leave... */
+      svm_region_unmap (vlib_rp);
+      clib_warning ("region init fail");
+      return (-2);
+
+    ready:
+      am->shmem_hdr = (void *) vlib_rp->user_ctx;
+      am->our_pid = getpid ();
+      am->vlib_rp = vlib_rp;
+      vec_add1 (am->mapped_shmem_regions, vlib_rp);
+      return 0;
+    }
+
+  /* Nope, it's our problem... */
+
+  oldheap = svm_push_data_heap (vlib_rp);
+
+  vec_validate (shmem_hdr, 0);
+  shmem_hdr->version = VL_SHM_VERSION;
+
+  /* vlib main input queue */
+  shmem_hdr->vl_input_queue =
+    unix_shared_memory_queue_init (1024, sizeof (uword), getpid (),
+				   am->vlib_signal);
+
+  /* Set up the msg ring allocator */
+#define _(sz,n)                                                 \
+    do {                                                        \
+        ring_alloc_t _rp;                                       \
+        _rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 0); \
+        _rp.size = (sz);                                        \
+        _rp.nitems = n;                                         \
+        _rp.hits = 0;                                           \
+        _rp.misses = 0;                                         \
+        vec_add1(shmem_hdr->vl_rings, _rp);                     \
+    } while (0);
+
+  foreach_vl_aring_size;
+#undef _
+
+#define _(sz,n)                                                 \
+    do {                                                        \
+        ring_alloc_t _rp;                                       \
+        _rp.rp = unix_shared_memory_queue_init ((n), (sz), 0, 0); \
+        _rp.size = (sz);                                        \
+        _rp.nitems = n;                                         \
+        _rp.hits = 0;                                           \
+        _rp.misses = 0;                                         \
+        vec_add1(shmem_hdr->client_rings, _rp);                 \
+    } while (0);
+
+  foreach_clnt_aring_size;
+#undef _
+
+  am->shmem_hdr = shmem_hdr;
+  am->vlib_rp = vlib_rp;
+  am->our_pid = getpid ();
+  if (is_vlib)
+    am->shmem_hdr->vl_pid = am->our_pid;
+
+  svm_pop_heap (oldheap);
+
+  /*
+   * After absolutely everything that a client might see is set up,
+   * declare the shmem region valid
+   */
+  vlib_rp->user_ctx = shmem_hdr;
+
+  pthread_mutex_unlock (&vlib_rp->mutex);
+  vec_add1 (am->mapped_shmem_regions, vlib_rp);
+  return 0;
+}
+
+void
+vl_register_mapped_shmem_region (svm_region_t * rp)
+{
+  api_main_t *am = &api_main;
+
+  vec_add1 (am->mapped_shmem_regions, rp);
+}
+
+void
+vl_unmap_shmem (void)
+{
+  svm_region_t *rp;
+  int i;
+  api_main_t *am = &api_main;
+
+  if (!svm_get_root_rp ())
+    return;
+
+  for (i = 0; i < vec_len (am->mapped_shmem_regions); i++)
+    {
+      rp = am->mapped_shmem_regions[i];
+      svm_region_unmap (rp);
+    }
+
+  vec_free (am->mapped_shmem_regions);
+  am->shmem_hdr = 0;
+
+  svm_region_exit ();
+  /* $$$ more careful cleanup, valgrind run... */
+  vec_free (am->msg_handlers);
+  vec_free (am->msg_endian_handlers);
+  vec_free (am->msg_print_handlers);
+}
+
+void
+vl_msg_api_send_shmem (unix_shared_memory_queue_t * q, u8 * elem)
+{
+  api_main_t *am = &api_main;
+  uword *trace = (uword *) elem;
+
+  if (am->tx_trace && am->tx_trace->enabled)
+    vl_msg_api_trace (am, am->tx_trace, (void *) trace[0]);
+
+  (void) unix_shared_memory_queue_add (q, elem, 0 /* nowait */ );
+}
+
+void
+vl_msg_api_send_shmem_nolock (unix_shared_memory_queue_t * q, u8 * elem)
+{
+  api_main_t *am = &api_main;
+  uword *trace = (uword *) elem;
+
+  if (am->tx_trace && am->tx_trace->enabled)
+    vl_msg_api_trace (am, am->tx_trace, (void *) trace[0]);
+
+  (void) unix_shared_memory_queue_add_nolock (q, elem);
+}
+
+static void
+vl_api_memclnt_create_reply_t_handler (vl_api_memclnt_create_reply_t * mp)
+{
+  serialize_main_t _sm, *sm = &_sm;
+  api_main_t *am = &api_main;
+  u8 *tblv;
+  u32 nmsgs;
+  int i;
+  u8 *name_and_crc;
+  u32 msg_index;
+
+  am->my_client_index = mp->index;
+  am->my_registration = (vl_api_registration_t *) (uword) mp->handle;
+
+  /* Clean out any previous hash table (unlikely) */
+  if (am->msg_index_by_name_and_crc)
+    {
+      int i;
+      u8 **keys = 0;
+      hash_pair_t *hp;
+      /* *INDENT-OFF* */
+      hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
+      ({
+        vec_add1 (keys, (u8 *) hp->key);
+      }));
+      /* *INDENT-ON* */
+      for (i = 0; i < vec_len (keys); i++)
+	vec_free (keys[i]);
+      vec_free (keys);
+    }
+
+  am->msg_index_by_name_and_crc = hash_create_string (0, sizeof (uword));
+
+  /* Recreate the vnet-side API message handler table */
+  tblv = (u8 *) mp->message_table;
+  serialize_open_vector (sm, tblv);
+  unserialize_integer (sm, &nmsgs, sizeof (u32));
+
+  for (i = 0; i < nmsgs; i++)
+    {
+      msg_index = unserialize_likely_small_unsigned_integer (sm);
+      unserialize_cstring (sm, (char **) &name_and_crc);
+      hash_set_mem (am->msg_index_by_name_and_crc, name_and_crc, msg_index);
+    }
+}
+
+u32
+vl_api_get_msg_index (u8 * name_and_crc)
+{
+  api_main_t *am = &api_main;
+  uword *p;
+
+  if (am->msg_index_by_name_and_crc)
+    {
+      p = hash_get_mem (am->msg_index_by_name_and_crc, name_and_crc);
+      if (p)
+	return p[0];
+    }
+  return ~0;
+}
+
+int
+vl_client_connect (char *name, int ctx_quota, int input_queue_size)
+{
+  svm_region_t *svm;
+  vl_api_memclnt_create_t *mp;
+  vl_api_memclnt_create_reply_t *rp;
+  unix_shared_memory_queue_t *vl_input_queue;
+  vl_shmem_hdr_t *shmem_hdr;
+  int rv = 0;
+  void *oldheap;
+  api_main_t *am = &api_main;
+
+  if (am->my_registration)
+    {
+      clib_warning ("client %s already connected...", name);
+      return -1;
+    }
+
+  if (am->vlib_rp == 0)
+    {
+      clib_warning ("am->vlib_rp NULL");
+      return -1;
+    }
+
+  svm = am->vlib_rp;
+  shmem_hdr = am->shmem_hdr;
+
+  if (shmem_hdr == 0 || shmem_hdr->vl_input_queue == 0)
+    {
+      clib_warning ("shmem_hdr / input queue NULL");
+      return -1;
+    }
+
+  pthread_mutex_lock (&svm->mutex);
+  oldheap = svm_push_data_heap (svm);
+  vl_input_queue =
+    unix_shared_memory_queue_init (input_queue_size, sizeof (uword),
+				   getpid (), 0);
+  pthread_mutex_unlock (&svm->mutex);
+  svm_pop_heap (oldheap);
+
+  am->my_client_index = ~0;
+  am->my_registration = 0;
+  am->vl_input_queue = vl_input_queue;
+
+  mp = vl_msg_api_alloc (sizeof (vl_api_memclnt_create_t));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_CREATE);
+  mp->ctx_quota = ctx_quota;
+  mp->input_queue = (uword) vl_input_queue;
+  strncpy ((char *) mp->name, name, sizeof (mp->name) - 1);
+
+  vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);
+
+  while (1)
+    {
+      int qstatus;
+      struct timespec ts, tsrem;
+      int i;
+
+      /* Wait up to 10 seconds */
+      for (i = 0; i < 1000; i++)
+	{
+	  qstatus = unix_shared_memory_queue_sub (vl_input_queue, (u8 *) & rp,
+						  1 /* nowait */ );
+	  if (qstatus == 0)
+	    goto read_one_msg;
+	  ts.tv_sec = 0;
+	  ts.tv_nsec = 10000 * 1000;	/* 10 ms */
+	  while (nanosleep (&ts, &tsrem) < 0)
+	    ts = tsrem;
+	}
+      /* Timeout... */
+      clib_warning ("memclnt_create_reply timeout");
+      return -1;
+
+    read_one_msg:
+      if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_CREATE_REPLY)
+	{
+	  clib_warning ("unexpected reply: id %d", ntohs (rp->_vl_msg_id));
+	  continue;
+	}
+      rv = clib_net_to_host_u32 (rp->response);
+
+      vl_msg_api_handler ((void *) rp);
+      break;
+    }
+  return (rv);
+}
+
+static void
+vl_api_memclnt_delete_reply_t_handler (vl_api_memclnt_delete_reply_t * mp)
+{
+  void *oldheap;
+  api_main_t *am = &api_main;
+
+  pthread_mutex_lock (&am->vlib_rp->mutex);
+  oldheap = svm_push_data_heap (am->vlib_rp);
+  unix_shared_memory_queue_free (am->vl_input_queue);
+  pthread_mutex_unlock (&am->vlib_rp->mutex);
+  svm_pop_heap (oldheap);
+
+  am->my_client_index = ~0;
+  am->my_registration = 0;
+  am->vl_input_queue = 0;
+}
+
+void
+vl_client_disconnect (void)
+{
+  vl_api_memclnt_delete_t *mp;
+  vl_api_memclnt_delete_reply_t *rp;
+  unix_shared_memory_queue_t *vl_input_queue;
+  vl_shmem_hdr_t *shmem_hdr;
+  time_t begin;
+  api_main_t *am = &api_main;
+
+  ASSERT (am->vlib_rp);
+  shmem_hdr = am->shmem_hdr;
+  ASSERT (shmem_hdr && shmem_hdr->vl_input_queue);
+
+  vl_input_queue = am->vl_input_queue;
+
+  mp = vl_msg_api_alloc (sizeof (vl_api_memclnt_delete_t));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (VL_API_MEMCLNT_DELETE);
+  mp->index = am->my_client_index;
+  mp->handle = (uword) am->my_registration;
+
+  vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);
+
+  /*
+   * Have to be careful here, in case the client is disconnecting
+   * because e.g. the vlib process died, or is unresponsive.
+   */
+
+  begin = time (0);
+  while (1)
+    {
+      time_t now;
+
+      now = time (0);
+
+      if (now >= (begin + 2))
+	{
+	  clib_warning ("peer unresponsive, give up");
+	  am->my_client_index = ~0;
+	  am->my_registration = 0;
+	  am->shmem_hdr = 0;
+	  break;
+	}
+      if (unix_shared_memory_queue_sub (vl_input_queue, (u8 *) & rp, 1) < 0)
+	continue;
+
+      /* drain the queue */
+      if (ntohs (rp->_vl_msg_id) != VL_API_MEMCLNT_DELETE_REPLY)
+	{
+	  vl_msg_api_handler ((void *) rp);
+	  continue;
+	}
+      vl_msg_api_handler ((void *) rp);
+      break;
+    }
+}
+
+static inline vl_api_registration_t *
+vl_api_client_index_to_registration_internal (u32 handle)
+{
+  vl_api_registration_t **regpp;
+  vl_api_registration_t *regp;
+  api_main_t *am = &api_main;
+  u32 index;
+
+  index = vl_msg_api_handle_get_index (handle);
+  if ((am->shmem_hdr->application_restarts & VL_API_EPOCH_MASK)
+      != vl_msg_api_handle_get_epoch (handle))
+    {
+      vl_msg_api_increment_missing_client_counter ();
+      return 0;
+    }
+
+  regpp = am->vl_clients + index;
+
+  if (pool_is_free (am->vl_clients, regpp))
+    {
+      vl_msg_api_increment_missing_client_counter ();
+      return 0;
+    }
+  regp = *regpp;
+  return (regp);
+}
+
+vl_api_registration_t *
+vl_api_client_index_to_registration (u32 index)
+{
+  return (vl_api_client_index_to_registration_internal (index));
+}
+
+unix_shared_memory_queue_t *
+vl_api_client_index_to_input_queue (u32 index)
+{
+  vl_api_registration_t *regp;
+  api_main_t *am = &api_main;
+
+  /* Special case: vlib trying to send itself a message */
+  if (index == (u32) ~ 0)
+    return (am->shmem_hdr->vl_input_queue);
+
+  regp = vl_api_client_index_to_registration_internal (index);
+  if (!regp)
+    return 0;
+  return (regp->vl_input_queue);
+}
+
+#define foreach_api_client_msg                  \
+_(MEMCLNT_CREATE_REPLY, memclnt_create_reply)   \
+_(MEMCLNT_DELETE_REPLY, memclnt_delete_reply)
+
+int
+vl_client_api_map (char *region_name)
+{
+  int rv;
+
+  if ((rv = vl_map_shmem (region_name, 0 /* is_vlib */ )) < 0)
+    {
+      return rv;
+    }
+
+#define _(N,n)                                                          \
+    vl_msg_api_set_handlers(VL_API_##N, 0 /* name */,                   \
+                           vl_api_##n##_t_handler,                      \
+                           0/* cleanup */, 0/* endian */, 0/* print */, \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_api_client_msg;
+#undef _
+  return 0;
+}
+
+void
+vl_client_api_unmap (void)
+{
+  vl_unmap_shmem ();
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */