include/lttng-sessiond-comm.h

   1 #ifndef _LTTNG_SESSIOND_COMM_H
   2 #define _LTTNG_SESSIOND_COMM_H
   3
   4 /*
   5  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   6  *                      Julien Desfossez <julien.desfossez@polymtl.ca>
   7  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; only version 2
  12  * of the License.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  */
  23
  24 /*
  25  * This header is meant for liblttng and libust internal use ONLY.
  26  * These declarations should NOT be considered stable API.
  27  */
  28
  29 #include <limits.h>
  30 #include <lttng/lttng.h>
  31
  32 #define LTTNG_RUNDIR                        "/var/run/lttng"
  33
  34 /* Default unix socket path */
  35 #define DEFAULT_GLOBAL_CLIENT_UNIX_SOCK     LTTNG_RUNDIR "/client-ltt-sessiond"
  36 #define DEFAULT_GLOBAL_APPS_UNIX_SOCK       LTTNG_RUNDIR "/apps-ltt-sessiond"
  37 #define DEFAULT_HOME_APPS_UNIX_SOCK         "%s/.apps-ltt-sessiond"
  38 #define DEFAULT_HOME_CLIENT_UNIX_SOCK       "%s/.client-ltt-sessiond"
  39
  40 /* Queue size of listen(2) */
  41 #define MAX_LISTEN 64
  42
  43 /*
  44  * Get the error code index from 0 since LTTCOMM_OK start at 1000
  45  */
  46 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_OK)
  47
  48 enum lttcomm_sessiond_command {
  49         /* Tracer command */
  50         LTTNG_ADD_CONTEXT,
  51         LTTNG_CALIBRATE,
  52         LTTNG_DISABLE_CHANNEL,
  53         LTTNG_DISABLE_EVENT,
  54         LTTNG_DISABLE_ALL_EVENT,
  55         LTTNG_ENABLE_CHANNEL,
  56         LTTNG_ENABLE_EVENT,
  57         LTTNG_ENABLE_ALL_EVENT,
  58         /* Session daemon command */
  59         LTTNG_CREATE_SESSION,
  60         LTTNG_DESTROY_SESSION,
  61         LTTNG_LIST_CHANNELS,
  62         LTTNG_LIST_DOMAINS,
  63         LTTNG_LIST_EVENTS,
  64         LTTNG_LIST_SESSIONS,
  65         LTTNG_LIST_TRACEPOINTS,
  66         LTTNG_REGISTER_CONSUMER,
  67         LTTNG_START_TRACE,
  68         LTTNG_STOP_TRACE,
  69 };
  70
  71 /*
  72  * lttcomm error code.
  73  */
  74 enum lttcomm_return_code {
  75         LTTCOMM_OK = 1000,                              /* Ok */
  76         LTTCOMM_ERR,                                    /* Unknown Error */
  77         LTTCOMM_UND,                                    /* Undefine command */
  78         LTTCOMM_NOT_IMPLEMENTED,        /* Command not implemented */
  79         LTTCOMM_UNKNOWN_DOMAIN,         /* Tracing domain not known */
  80         LTTCOMM_ALLOC_FAIL,                             /* Trace allocation fail */
  81         LTTCOMM_NO_SESSION,                             /* No session found */
  82         LTTCOMM_CREATE_FAIL,                    /* Create trace fail */
  83         LTTCOMM_SESSION_FAIL,                   /* Create session fail */
  84         LTTCOMM_START_FAIL,                             /* Start tracing fail */
  85         LTTCOMM_STOP_FAIL,                              /* Stop tracing fail */
  86         LTTCOMM_LIST_FAIL,                              /* Listing apps fail */
  87         LTTCOMM_NO_APPS,                                /* No traceable application */
  88         LTTCOMM_SESS_NOT_FOUND,                 /* Session name not found */
  89         LTTCOMM_NO_TRACE,                               /* No trace exist */
  90         LTTCOMM_FATAL,                                  /* Session daemon had a fatal error */
  91         LTTCOMM_NO_TRACEABLE,                   /* Error for non traceable app */
  92         LTTCOMM_SELECT_SESS,                    /* Must select a session */
  93         LTTCOMM_EXIST_SESS,                             /* Session name already exist */
  94         LTTCOMM_NO_EVENT,                               /* No event found */
  95         LTTCOMM_CONNECT_FAIL,           /* Unable to connect to unix socket */
  96         LTTCOMM_APP_NOT_FOUND,          /* App not found in traceable app list */
  97         LTTCOMM_KERN_NA,                                /* Kernel tracer unavalable */
  98         LTTCOMM_KERN_EVENT_EXIST,       /* Kernel event already exists */
  99         LTTCOMM_KERN_SESS_FAIL,                 /* Kernel create session failed */
 100         LTTCOMM_KERN_CHAN_FAIL,                 /* Kernel create channel failed */
 101         LTTCOMM_KERN_CHAN_NOT_FOUND,    /* Kernel channel not found */
 102         LTTCOMM_KERN_CHAN_DISABLE_FAIL, /* Kernel disable channel failed */
 103         LTTCOMM_KERN_CHAN_ENABLE_FAIL,  /* Kernel enable channel failed */
 104         LTTCOMM_KERN_CONTEXT_FAIL,      /* Kernel add context failed */
 105         LTTCOMM_KERN_ENABLE_FAIL,               /* Kernel enable event failed */
 106         LTTCOMM_KERN_DISABLE_FAIL,              /* Kernel disable event failed */
 107         LTTCOMM_KERN_META_FAIL,                 /* Kernel open metadata failed */
 108         LTTCOMM_KERN_START_FAIL,                /* Kernel start trace failed */
 109         LTTCOMM_KERN_STOP_FAIL,                 /* Kernel stop trace failed */
 110         LTTCOMM_KERN_CONSUMER_FAIL,             /* Kernel consumer start failed */
 111         LTTCOMM_KERN_STREAM_FAIL,               /* Kernel create stream failed */
 112         LTTCOMM_KERN_DIR_FAIL,                  /* Kernel trace directory creation failed */
 113         LTTCOMM_KERN_DIR_EXIST,                 /* Kernel trace directory exist */
 114         LTTCOMM_KERN_NO_SESSION,                /* No kernel session found */
 115         LTTCOMM_KERN_LIST_FAIL,                 /* Kernel listing events failed */
 116         LTTCOMM_UST_SESS_FAIL,                  /* UST create session failed */
 117         LTTCOMM_UST_CHAN_NOT_FOUND,     /* UST channel not found */
 118         LTTCOMM_UST_CHAN_FAIL,          /* UST create channel failed */
 119         CONSUMERD_COMMAND_SOCK_READY,           /* when consumerd command socket ready */
 120         CONSUMERD_SUCCESS_RECV_FD,              /* success on receiving fds */
 121         CONSUMERD_ERROR_RECV_FD,                /* error on receiving fds */
 122         CONSUMERD_POLL_ERROR,                   /* Error in polling thread in kconsumerd */
 123         CONSUMERD_POLL_NVAL,                    /* Poll on closed fd */
 124         CONSUMERD_POLL_HUP,                     /* All fds have hungup */
 125         CONSUMERD_EXIT_SUCCESS,                 /* kconsumerd exiting normally */
 126         CONSUMERD_EXIT_FAILURE,                 /* kconsumerd exiting on error */
 127         CONSUMERD_OUTFD_ERROR,                  /* error opening the tracefile */
 128         CONSUMERD_SPLICE_EBADF,                 /* EBADF from splice(2) */
 129         CONSUMERD_SPLICE_EINVAL,                /* EINVAL from splice(2) */
 130         CONSUMERD_SPLICE_ENOMEM,                /* ENOMEM from splice(2) */
 131         CONSUMERD_SPLICE_ESPIPE,                /* ESPIPE from splice(2) */
 132         /* MUST be last element */
 133         LTTCOMM_NR,                                             /* Last element */
 134 };
 135
 136 /*
 137  * Data structure received from lttng client to session daemon.
 138  */
 139 struct lttcomm_session_msg {
 140         uint32_t cmd_type;    /* enum lttcomm_sessiond_command */
 141         struct lttng_session session;
 142         struct lttng_domain domain;
 143         union {
 144                 struct {
 145                         char channel_name[NAME_MAX];
 146                         char name[NAME_MAX];
 147                 } disable;
 148                 /* Event data */
 149                 struct {
 150                         char channel_name[NAME_MAX];
 151                         struct lttng_event event;
 152                 } enable;
 153                 /* Create channel */
 154                 struct {
 155                         struct lttng_channel chan;
 156                 } channel;
 157                 /* Context */
 158                 struct {
 159                         char channel_name[NAME_MAX];
 160                         char event_name[NAME_MAX];
 161                         struct lttng_event_context ctx;
 162                 } context;
 163                 /* Use by register_consumer */
 164                 struct {
 165                         char path[PATH_MAX];
 166                 } reg;
 167                 /* List */
 168                 struct {
 169                         char channel_name[NAME_MAX];
 170                 } list;
 171                 struct lttng_calibrate calibrate;
 172         } u;
 173 };
 174
 175 /*
 176  * Data structure for the response from sessiond to the lttng client.
 177  */
 178 struct lttcomm_lttng_msg {
 179         uint32_t cmd_type;   /* enum lttcomm_sessiond_command */
 180         uint32_t ret_code;   /* enum lttcomm_return_code */
 181         uint32_t pid;        /* pid_t */
 182         uint32_t data_size;
 183         /* Contains: trace_name + data */
 184         char payload[];
 185 };
 186
 187 /*
 188  * lttcomm_consumer_msg is the message sent from sessiond to consumerd
 189  * to either add a channel, add a stream, update a stream, or stop
 190  * operation.
 191  */
 192 struct lttcomm_consumer_msg {
 193         uint32_t cmd_type;      /* enum consumerd_command */
 194         union {
 195                 struct {
 196                         int channel_key;
 197                         uint64_t max_sb_size; /* the subbuffer size for this channel */
 198                         /* shm_fd and wait_fd are sent as ancillary data */
 199                         uint64_t mmap_len;
 200                 } channel;
 201                 struct {
 202                         int channel_key;
 203                         int stream_key;
 204                         /* shm_fd and wait_fd are sent as ancillary data */
 205                         uint32_t state;    /* enum lttcomm_consumer_fd_state */
 206                         enum lttng_event_output output; /* use splice or mmap to consume this fd */
 207                         uint64_t mmap_len;
 208                         char path_name[PATH_MAX];
 209                 } stream;
 210         } u;
 211 };
 212
 213 #ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
 214
 215 #include <ust/lttng-ust-abi.h>
 216
 217 /*
 218  * Data structure for the commands sent from sessiond to UST.
 219  */
 220 struct lttcomm_ust_msg {
 221         uint32_t handle;
 222         uint32_t cmd;
 223         union {
 224                 struct lttng_ust_tracer_version version;
 225                 struct lttng_ust_channel channel;
 226                 struct lttng_ust_event event;
 227                 struct lttng_ust_context context;
 228         } u;
 229 };
 230
 231 /*
 232  * Data structure for the response from UST to the session daemon.
 233  * cmd_type is sent back in the reply for validation.
 234  */
 235 struct lttcomm_ust_reply {
 236         uint32_t handle;
 237         uint32_t cmd;
 238         uint32_t ret_code;      /* enum lttcomm_return_code */
 239         uint32_t ret_val;       /* return value */
 240         union {
 241                 struct {
 242                         uint64_t memory_map_size;
 243                 } channel;
 244                 struct {
 245                         uint64_t memory_map_size;
 246                 } stream;
 247         } u;
 248 };
 249
 250 #endif /* CONFIG_LTTNG_TOOLS_HAVE_UST */
 251
 252 extern int lttcomm_create_unix_sock(const char *pathname);
 253 extern int lttcomm_connect_unix_sock(const char *pathname);
 254 extern int lttcomm_accept_unix_sock(int sock);
 255 extern int lttcomm_listen_unix_sock(int sock);
 256 extern int lttcomm_close_unix_sock(int sock);
 257
 258 #define LTTCOMM_MAX_SEND_FDS    4
 259 /* Send a message accompanied by fd(s) over a unix socket. */
 260 extern ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd);
 261 /* Recv a message accompanied by fd(s) from a unix socket */
 262 extern ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd);
 263
 264 extern ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len);
 265 extern ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len);
 266 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
 267
 268 #endif  /* _LTTNG_SESSIOND_COMM_H */