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 #define _LGPL_SOURCE
  21 #include <common/common.h>
  22
  23 #include "connection.h"
  24 #include "stream.h"
  25
  26 static void rcu_free_connection(struct rcu_head *head)
  27 {
  28         struct relay_connection *conn =
  29                 caa_container_of(head, struct relay_connection, rcu_node);
  30
  31         lttcomm_destroy_sock(conn->sock);
  32         connection_free(conn);
  33 }
  34
  35 /*
  36  * Must be called with a read side lock held. The read side lock must be
  37  * kept until the returned relay_connection is no longer in use.
  38  */
  39 struct relay_connection *connection_find_by_sock(struct lttng_ht *ht, int sock)
  40 {
  41         struct lttng_ht_node_ulong *node;
  42         struct lttng_ht_iter iter;
  43         struct relay_connection *conn = NULL;
  44
  45         assert(ht);
  46         assert(sock >= 0);
  47
  48         lttng_ht_lookup(ht, (void *)((unsigned long) sock), &iter);
  49         node = lttng_ht_iter_get_node_ulong(&iter);
  50         if (!node) {
  51                 DBG2("Relay connection by sock %d not found", sock);
  52                 goto end;
  53         }
  54         conn = caa_container_of(node, struct relay_connection, sock_n);
  55
  56 end:
  57         return conn;
  58 }
  59
  60 void connection_delete(struct lttng_ht *ht, struct relay_connection *conn)
  61 {
  62         int ret;
  63         struct lttng_ht_iter iter;
  64
  65         assert(ht);
  66         assert(conn);
  67
  68         iter.iter.node = &conn->sock_n.node;
  69         ret = lttng_ht_del(ht, &iter);
  70         assert(!ret);
  71 }
  72
  73 void connection_destroy(struct relay_connection *conn)
  74 {
  75         assert(conn);
  76
  77         call_rcu(&conn->rcu_node, rcu_free_connection);
  78 }
  79
  80 struct relay_connection *connection_create(void)
  81 {
  82         struct relay_connection *conn;
  83
  84         conn = zmalloc(sizeof(*conn));
  85         if (!conn) {
  86                 PERROR("zmalloc relay connection");
  87                 goto error;
  88         }
  89
  90 error:
  91         return conn;
  92 }
  93
  94 void connection_init(struct relay_connection *conn)
  95 {
  96         assert(conn);
  97         assert(conn->sock);
  98
  99         CDS_INIT_LIST_HEAD(&conn->recv_head);
 100         lttng_ht_node_init_ulong(&conn->sock_n, (unsigned long) conn->sock->fd);
 101 }
 102
 103 void connection_free(struct relay_connection *conn)
 104 {
 105         assert(conn);
 106
 107         free(conn->viewer_session);
 108         free(conn);
 109 }