| 1 | /* |
| 2 | * Copyright (C) 2014 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _LGPL_SOURCE |
| 19 | #include <common/error.h> |
| 20 | #include <common/config/session-config.h> |
| 21 | |
| 22 | #include "load-session-thread.h" |
| 23 | #include "lttng-sessiond.h" |
| 24 | |
| 25 | /* |
| 26 | * Destroy the thread data previously created with the init function. |
| 27 | */ |
| 28 | void load_session_destroy_data(struct load_session_thread_data *data) |
| 29 | { |
| 30 | if (!data) { |
| 31 | return; |
| 32 | } |
| 33 | |
| 34 | if (data->sem_initialized) { |
| 35 | int ret; |
| 36 | |
| 37 | ret = sem_destroy(&data->message_thread_ready); |
| 38 | if (ret) { |
| 39 | PERROR("sem_destroy message_thread_ready"); |
| 40 | } |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | /* |
| 45 | * Initialize the thread data. This MUST be called before the thread load |
| 46 | * session is created. |
| 47 | * |
| 48 | * Return 0 on success else a negative value. Note that the destroy function |
| 49 | * can be called with no or partially initialized data. |
| 50 | */ |
| 51 | int load_session_init_data(struct load_session_thread_data **data) |
| 52 | { |
| 53 | int ret; |
| 54 | struct load_session_thread_data *_data = NULL; |
| 55 | |
| 56 | assert(data); |
| 57 | |
| 58 | /* |
| 59 | * Allocate memory here since this function is called from the main thread |
| 60 | * can die *before* the end of the load session thread. |
| 61 | */ |
| 62 | _data = zmalloc(sizeof(*_data)); |
| 63 | if (!_data) { |
| 64 | PERROR("zmalloc load session info"); |
| 65 | goto error; |
| 66 | } |
| 67 | ret = sem_init(&_data->message_thread_ready, 0, 0); |
| 68 | if (ret) { |
| 69 | PERROR("sem_init message_thread_ready"); |
| 70 | goto error; |
| 71 | } |
| 72 | _data->sem_initialized = 1; |
| 73 | |
| 74 | *data = _data; |
| 75 | return 0; |
| 76 | |
| 77 | error: |
| 78 | free(_data); |
| 79 | return -1; |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * This thread loads session configurations once the session daemon is |
| 84 | * ready to process client messages. |
| 85 | */ |
| 86 | void *thread_load_session(void *data) |
| 87 | { |
| 88 | int ret; |
| 89 | struct load_session_thread_data *info = data; |
| 90 | |
| 91 | DBG("[load-session-thread] Load session"); |
| 92 | |
| 93 | ret = sem_wait(&info->message_thread_ready); |
| 94 | if (ret) { |
| 95 | PERROR("sem_wait message_thread_ready"); |
| 96 | goto end; |
| 97 | } |
| 98 | |
| 99 | /* Override existing session and autoload also. */ |
| 100 | ret = config_load_session(info->path, NULL, 1, 1, NULL); |
| 101 | if (ret) { |
| 102 | ERR("Session load failed: %s", error_get_str(ret)); |
| 103 | } |
| 104 | |
| 105 | end: |
| 106 | sessiond_notify_ready(); |
| 107 | return NULL; |
| 108 | } |