lttng-sessiond/ust-app.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #ifndef _LTT_UST_APP_H
  20 #define _LTT_UST_APP_H
  21
  22 #include <stdint.h>
  23 #include <urcu/list.h>
  24
  25 #include "trace-ust.h"
  26
  27 #define UST_APP_EVENT_LIST_SIZE 32
  28
  29 extern int ust_consumer_fd;
  30
  31 /*
  32  * Application registration data structure.
  33  */
  34 struct ust_register_msg {
  35         uint32_t major;
  36         uint32_t minor;
  37         pid_t pid;
  38         pid_t ppid;
  39         uid_t uid;
  40         gid_t gid;
  41         uint32_t bits_per_long;
  42         char name[16];
  43 };
  44
  45 /*
  46  * Global applications HT used by the session daemon.
  47  */
  48 struct cds_lfht *ust_app_ht;
  49
  50 struct cds_lfht *ust_app_sock_key_map;
  51
  52 struct ust_app_key {
  53         pid_t pid;
  54         int sock;
  55         struct cds_lfht_node node;
  56 };
  57
  58 struct ust_app_event {
  59         int enabled;
  60         int handle;
  61         struct lttng_ust_object_data *obj;
  62         struct lttng_ust_event attr;
  63         char name[LTTNG_UST_SYM_NAME_LEN];
  64         struct cds_lfht *ctx;
  65         struct cds_lfht_node node;
  66 };
  67
  68 struct ust_app_channel {
  69         int enabled;
  70         int handle;
  71         char name[LTTNG_UST_SYM_NAME_LEN];
  72         struct lttng_ust_channel attr;
  73         struct lttng_ust_object_data *obj;
  74         struct ltt_ust_stream_list streams;
  75         struct cds_lfht *ctx;
  76         struct cds_lfht *events;
  77         struct cds_lfht_node node;
  78 };
  79
  80 struct ust_app_session {
  81         int enabled;
  82         /* started: has the session been in started state at any time ? */
  83         int started;  /* allows detection of start vs restart. */
  84         int handle;   /* Used has unique identifier */
  85         unsigned int uid;
  86         struct ltt_ust_metadata *metadata;
  87         struct cds_lfht *channels; /* Registered channels */
  88         struct cds_lfht_node node;
  89         char path[PATH_MAX];
  90 };
  91
  92 /*
  93  * Registered traceable applications. Libust registers to the session daemon
  94  * and a linked list is kept of all running traceable app.
  95  */
  96 struct ust_app {
  97         pid_t ppid;
  98         uid_t uid;           /* User ID that owns the apps */
  99         gid_t gid;           /* Group ID that owns the apps */
 100         uint32_t v_major;    /* Verion major number */
 101         uint32_t v_minor;    /* Verion minor number */
 102         char name[17];       /* Process name (short) */
 103         struct cds_lfht *sessions;
 104         struct cds_lfht_node node;
 105         struct ust_app_key key;
 106 };
 107
 108 #ifdef HAVE_LIBLTTNG_UST_CTL
 109
 110 int ust_app_register(struct ust_register_msg *msg, int sock);
 111 void ust_app_unregister(int sock);
 112 int ust_app_create_channel_all(struct ltt_ust_session *usess,
 113                 struct ltt_ust_channel *uchan);
 114 int ust_app_create_event_all(struct ltt_ust_session *usess,
 115                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 116 unsigned long ust_app_list_count(void);
 117 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app);
 118 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app);
 119 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 120 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
 121 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app);
 122 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
 123 int ust_app_list_events(struct lttng_event **events);
 124 void ust_app_global_update(struct ltt_ust_session *usess, int sock);
 125
 126 void ust_app_clean_list(void);
 127 void ust_app_ht_alloc(void);
 128 struct cds_lfht *ust_app_get_ht(void);
 129 struct ust_app *ust_app_find_by_pid(pid_t pid);
 130
 131 #else /* HAVE_LIBLTTNG_UST_CTL */
 132
 133 static inline
 134 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
 135 {
 136         return 0;
 137 }
 138 static inline
 139 int ust_app_start_trace_all(struct ltt_ust_session *usess)
 140 {
 141         return 0;
 142 }
 143 static inline
 144 int ust_app_list_events(struct lttng_event **events)
 145 {
 146         return 0;
 147 }
 148 static inline
 149 int ust_app_register(struct ust_register_msg *msg, int sock)
 150 {
 151         return -ENOSYS;
 152 }
 153 static inline
 154 void ust_app_unregister(int sock)
 155 {
 156 }
 157 static inline
 158 unsigned int ust_app_list_count(void)
 159 {
 160         return 0;
 161 }
 162 static inline
 163 void ust_app_lock_list(void)
 164 {
 165 }
 166 static inline
 167 void ust_app_unlock_list(void)
 168 {
 169 }
 170 static inline
 171 void ust_app_clean_list(void)
 172 {
 173 }
 174 static inline
 175 struct ust_app_list *ust_app_get_list(void)
 176 {
 177         return NULL;
 178 }
 179 static inline
 180 struct ust_app *ust_app_get_by_pid(pid_t pid)
 181 {
 182         return NULL;
 183 }
 184 static inline
 185 int ust_app_add_channel_all(struct ltt_ust_session *usess,
 186                 struct ltt_ust_channel *uchan)
 187 {
 188         return 0;
 189 }
 190 static inline
 191 int ust_app_add_event_all(struct ltt_ust_session *usess,
 192                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
 193 {
 194         return 0;
 195 }
 196 static inline
 197 struct cds_lfht *ust_app_get_ht(void)
 198 {
 199         return NULL;
 200 }
 201 static inline
 202 void ust_app_ht_alloc(void)
 203 {
 204 }
 205 static inline
 206 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
 207 {
 208 }
 209
 210 #endif /* HAVE_LIBLTTNG_UST_CTL */
 211
 212 #endif /* _LTT_UST_APP_H */