src/bin/lttng-relayd/connection.c

   1 /*
   2  * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
   3  *                      David Goulet <dgoulet@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License, version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 51
  16  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <common/common.h>
  21
  22 #include "connection.h"
  23 #include "stream.h"
  24
  25 static void rcu_free_connection(struct rcu_head *head)
  26 {
  27         struct relay_connection *conn =
  28                 caa_container_of(head, struct relay_connection, rcu_node);
  29
  30         lttcomm_destroy_sock(conn->sock);
  31         connection_free(conn);
  32 }
  33
  34 struct relay_connection *connection_find_by_sock(struct lttng_ht *ht, int sock)
  35 {
  36         struct lttng_ht_node_ulong *node;
  37         struct lttng_ht_iter iter;
  38         struct relay_connection *conn = NULL;
  39
  40         assert(ht);
  41         assert(sock >= 0);
  42
  43         lttng_ht_lookup(ht, (void *)((unsigned long) sock), &iter);
  44         node = lttng_ht_iter_get_node_ulong(&iter);
  45         if (!node) {
  46                 DBG2("Relay connection by sock %d not found", sock);
  47                 goto end;
  48         }
  49         conn = caa_container_of(node, struct relay_connection, sock_n);
  50
  51 end:
  52         return conn;
  53 }
  54
  55 void connection_delete(struct lttng_ht *ht, struct relay_connection *conn)
  56 {
  57         int ret;
  58         struct lttng_ht_iter iter;
  59
  60         assert(ht);
  61         assert(conn);
  62
  63         iter.iter.node = &conn->sock_n.node;
  64         ret = lttng_ht_del(ht, &iter);
  65         assert(!ret);
  66 }
  67
  68 void connection_destroy(struct relay_connection *conn)
  69 {
  70         struct relay_stream *stream, *tmp_stream;
  71
  72         assert(conn);
  73
  74         /* Clean up recv list of this connection if any. */
  75         cds_list_for_each_entry_safe(stream, tmp_stream, &conn->recv_head,
  76                         recv_list) {
  77                 cds_list_del(&stream->recv_list);
  78         }
  79
  80         call_rcu(&conn->rcu_node, rcu_free_connection);
  81 }
  82
  83 struct relay_connection *connection_create(void)
  84 {
  85         struct relay_connection *conn;
  86
  87         conn = zmalloc(sizeof(*conn));
  88         if (!conn) {
  89                 PERROR("zmalloc relay connection");
  90                 goto error;
  91         }
  92
  93 error:
  94         return conn;
  95 }
  96
  97 void connection_init(struct relay_connection *conn)
  98 {
  99         assert(conn);
 100         assert(conn->sock);
 101
 102         CDS_INIT_LIST_HEAD(&conn->recv_head);
 103         lttng_ht_node_init_ulong(&conn->sock_n, (unsigned long) conn->sock->fd);
 104 }
 105
 106 void connection_free(struct relay_connection *conn)
 107 {
 108         assert(conn);
 109
 110         free(conn->viewer_session);
 111         free(conn);
 112 }