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