shm-path: remove directory hierarchy on destroy

[lttng-tools.git] / src / bin / lttng-sessiond / consumer.c

diff --git a/src/bin/lttng-sessiond/consumer.c b/src/bin/lttng-sessiond/consumer.c
index 8806e9c322bef43b818975bee8f44bc520e3aa53..87d5f34387befba860e31feefe0059a9c8c12f9b 100644 (file)
--- a/src/bin/lttng-sessiond/consumer.c
+++ b/src/bin/lttng-sessiond/consumer.c
@@ -16,6 +16,7 @@
  */
 
 #define _GNU_SOURCE
+#define _LGPL_SOURCE
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -207,6 +208,7 @@ int consumer_send_destroy_relayd(struct consumer_socket *sock,
 
        DBG2("Sending destroy relayd command to consumer sock %d", *sock->fd_ptr);
 
+       memset(&msg, 0, sizeof(msg));
        msg.cmd_type = LTTNG_CONSUMER_DESTROY_RELAYD;
        msg.u.destroy_relayd.net_seq_idx = consumer->net_seq_index;
 
@@ -799,7 +801,9 @@ void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
                uint64_t tracefile_count,
                uint64_t session_id_per_pid,
                unsigned int monitor,
-               uint32_t ust_app_uid)
+               uint32_t ust_app_uid,
+               const char *root_shm_path,
+               const char *shm_path)
 {
        assert(msg);
 
@@ -837,6 +841,17 @@ void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 
        strncpy(msg->u.ask_channel.name, name, sizeof(msg->u.ask_channel.name));
        msg->u.ask_channel.name[sizeof(msg->u.ask_channel.name) - 1] = '\0';
+
+       if (root_shm_path) {
+               strncpy(msg->u.ask_channel.root_shm_path, root_shm_path,
+                       sizeof(msg->u.ask_channel.root_shm_path));
+               msg->u.ask_channel.root_shm_path[sizeof(msg->u.ask_channel.root_shm_path) - 1] = '\0';
+       }
+       if (shm_path) {
+               strncpy(msg->u.ask_channel.shm_path, shm_path,
+                       sizeof(msg->u.ask_channel.shm_path));
+               msg->u.ask_channel.shm_path[sizeof(msg->u.ask_channel.shm_path) - 1] = '\0';
+       }
 }
 
 /*
@@ -965,6 +980,7 @@ int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
        assert(consumer);
        assert(consumer_sock);
 
+       memset(&msg, 0, sizeof(msg));
        /* Bail out if consumer is disabled */
        if (!consumer->enabled) {
                ret = LTTNG_OK;
@@ -1078,12 +1094,12 @@ int consumer_is_data_pending(uint64_t session_id,
 
        assert(consumer);
 
-       msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING;
+       DBG3("Consumer data pending for id %" PRIu64, session_id);
 
+       memset(&msg, 0, sizeof(msg));
+       msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING;
        msg.u.data_pending.session_id = session_id;
 
-       DBG3("Consumer data pending for id %" PRIu64, session_id);
-
        /* Send command for each consumer */
        rcu_read_lock();
        cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
@@ -1136,6 +1152,7 @@ int consumer_flush_channel(struct consumer_socket *socket, uint64_t key)
 
        DBG2("Consumer flush channel key %" PRIu64, key);
 
+       memset(&msg, 0, sizeof(msg));
        msg.cmd_type = LTTNG_CONSUMER_FLUSH_CHANNEL;
        msg.u.flush_channel.key = key;
 
@@ -1154,7 +1171,8 @@ end:
 }
 
 /*
- * Send a close metdata command to consumer using the given channel key.
+ * Send a close metadata command to consumer using the given channel key.
+ * Called with registry lock held.
  *
  * Return 0 on success else a negative value.
  */
@@ -1168,6 +1186,7 @@ int consumer_close_metadata(struct consumer_socket *socket,
 
        DBG2("Consumer close metadata channel key %" PRIu64, metadata_key);
 
+       memset(&msg, 0, sizeof(msg));
        msg.cmd_type = LTTNG_CONSUMER_CLOSE_METADATA;
        msg.u.close_metadata.key = metadata_key;
 
@@ -1200,6 +1219,7 @@ int consumer_setup_metadata(struct consumer_socket *socket,
 
        DBG2("Consumer setup metadata channel key %" PRIu64, metadata_key);
 
+       memset(&msg, 0, sizeof(msg));
        msg.cmd_type = LTTNG_CONSUMER_SETUP_METADATA;
        msg.u.setup_metadata.key = metadata_key;
 
@@ -1218,7 +1238,8 @@ end:
 }
 
 /*
- * Send metadata string to consumer. Socket lock MUST be acquired.
+ * Send metadata string to consumer.
+ * RCU read-side lock must be held to guarantee existence of socket.
  *
  * Return 0 on success else a negative value.
  */
@@ -1233,6 +1254,9 @@ int consumer_push_metadata(struct consumer_socket *socket,
 
        DBG2("Consumer push metadata to consumer socket %d", *socket->fd_ptr);
 
+       pthread_mutex_lock(socket->lock);
+
+       memset(&msg, 0, sizeof(msg));
        msg.cmd_type = LTTNG_CONSUMER_PUSH_METADATA;
        msg.u.push_metadata.key = metadata_key;
        msg.u.push_metadata.target_offset = target_offset;
@@ -1259,6 +1283,7 @@ int consumer_push_metadata(struct consumer_socket *socket,
        }
 
 end:
+       pthread_mutex_unlock(socket->lock);
        health_code_update();
        return ret;
 }
@@ -1270,7 +1295,7 @@ end:
  */
 int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
                struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
-               const char *session_path, int wait, int max_stream_size)
+               const char *session_path, int wait, uint64_t nb_packets_per_stream)
 {
        int ret;
        struct lttcomm_consumer_msg msg;
@@ -1284,7 +1309,7 @@ int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
        memset(&msg, 0, sizeof(msg));
        msg.cmd_type = LTTNG_CONSUMER_SNAPSHOT_CHANNEL;
        msg.u.snapshot_channel.key = key;
-       msg.u.snapshot_channel.max_stream_size = max_stream_size;
+       msg.u.snapshot_channel.nb_packets_per_stream = nb_packets_per_stream;
        msg.u.snapshot_channel.metadata = metadata;
 
        if (output->consumer->type == CONSUMER_DST_NET) {