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 #include <lttng-ust.h>
  32
  33 #define LTTNG_RUNDIR                        "/var/run/lttng"
  34
  35 /* Default unix socket path */
  36 #define DEFAULT_GLOBAL_CLIENT_UNIX_SOCK     LTTNG_RUNDIR "/client-ltt-sessiond"
  37 #define DEFAULT_GLOBAL_APPS_UNIX_SOCK       LTTNG_RUNDIR "/apps-ltt-sessiond"
  38 #define DEFAULT_HOME_APPS_UNIX_SOCK         "%s/.apps-ltt-sessiond"
  39 #define DEFAULT_HOME_CLIENT_UNIX_SOCK       "%s/.client-ltt-sessiond"
  40
  41 /* Queue size of listen(2) */
  42 #define MAX_LISTEN 10
  43
  44 /*
  45  * Get the error code index from 0 since LTTCOMM_OK start at 1000
  46  */
  47 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_OK)
  48
  49 enum lttcomm_sessiond_command {
  50         /* Tracer command */
  51         LTTNG_ADD_CONTEXT,
  52         LTTNG_CALIBRATE,
  53         LTTNG_DISABLE_CHANNEL,
  54         LTTNG_DISABLE_EVENT,
  55         LTTNG_DISABLE_ALL_EVENT,
  56         LTTNG_ENABLE_CHANNEL,
  57         LTTNG_ENABLE_EVENT,
  58         LTTNG_ENABLE_ALL_EVENT,
  59         /* Session daemon command */
  60         LTTNG_CREATE_SESSION,
  61         LTTNG_DESTROY_SESSION,
  62         LTTNG_LIST_CHANNELS,
  63         LTTNG_LIST_DOMAINS,
  64         LTTNG_LIST_EVENTS,
  65         LTTNG_LIST_SESSIONS,
  66         LTTNG_LIST_TRACEPOINTS,
  67         LTTNG_REGISTER_CONSUMER,
  68         LTTNG_START_TRACE,
  69         LTTNG_STOP_TRACE,
  70 };
  71
  72 /*
  73  * lttcomm error code.
  74  */
  75 enum lttcomm_return_code {
  76         LTTCOMM_OK = 1000,                              /* Ok */
  77         LTTCOMM_ERR,                                    /* Unknown Error */
  78         LTTCOMM_UND,                                    /* Undefine command */
  79         LTTCOMM_NOT_IMPLEMENTED,        /* Command not implemented */
  80         LTTCOMM_UNKNOWN_DOMAIN,         /* Tracing domain not known */
  81         LTTCOMM_ALLOC_FAIL,                             /* Trace allocation fail */
  82         LTTCOMM_NO_SESSION,                             /* No session found */
  83         LTTCOMM_CREATE_FAIL,                    /* Create trace fail */
  84         LTTCOMM_SESSION_FAIL,                   /* Create session fail */
  85         LTTCOMM_START_FAIL,                             /* Start tracing fail */
  86         LTTCOMM_STOP_FAIL,                              /* Stop tracing fail */
  87         LTTCOMM_LIST_FAIL,                              /* Listing apps fail */
  88         LTTCOMM_NO_APPS,                                /* No traceable application */
  89         LTTCOMM_SESS_NOT_FOUND,                 /* Session name not found */
  90         LTTCOMM_NO_TRACE,                               /* No trace exist */
  91         LTTCOMM_FATAL,                                  /* Session daemon had a fatal error */
  92         LTTCOMM_NO_TRACEABLE,                   /* Error for non traceable app */
  93         LTTCOMM_SELECT_SESS,                    /* Must select a session */
  94         LTTCOMM_EXIST_SESS,                             /* Session name already exist */
  95         LTTCOMM_NO_EVENT,                               /* No event found */
  96         LTTCOMM_CONNECT_FAIL,           /* Unable to connect to unix socket */
  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         KCONSUMERD_COMMAND_SOCK_READY,  /* when kconsumerd command socket ready */
 117         KCONSUMERD_SUCCESS_RECV_FD,             /* success on receiving fds */
 118         KCONSUMERD_ERROR_RECV_FD,               /* error on receiving fds */
 119         KCONSUMERD_POLL_ERROR,                  /* Error in polling thread in kconsumerd */
 120         KCONSUMERD_POLL_NVAL,                   /* Poll on closed fd */
 121         KCONSUMERD_POLL_HUP,                    /* All fds have hungup */
 122         KCONSUMERD_EXIT_SUCCESS,                /* kconsumerd exiting normally */
 123         KCONSUMERD_EXIT_FAILURE,                /* kconsumerd exiting on error */
 124         KCONSUMERD_OUTFD_ERROR,                 /* error opening the tracefile */
 125         KCONSUMERD_SPLICE_EBADF,                /* EBADF from splice(2) */
 126         KCONSUMERD_SPLICE_EINVAL,               /* EINVAL from splice(2) */
 127         KCONSUMERD_SPLICE_ENOMEM,               /* ENOMEM from splice(2) */
 128         KCONSUMERD_SPLICE_ESPIPE,               /* ESPIPE from splice(2) */
 129         /* MUST be last element */
 130         LTTCOMM_NR,                                             /* Last element */
 131 };
 132
 133 /*
 134  * Data structure received from lttng client to session daemon.
 135  */
 136 struct lttcomm_session_msg {
 137         uint32_t cmd_type;    /* enum lttcomm_sessiond_command */
 138         struct lttng_session session;
 139         struct lttng_domain domain;
 140         union {
 141                 struct {
 142                         char channel_name[NAME_MAX];
 143                         char name[NAME_MAX];
 144                 } disable;
 145                 /* Event data */
 146                 struct {
 147                         char channel_name[NAME_MAX];
 148                         struct lttng_event event;
 149                 } enable;
 150                 /* Create channel */
 151                 struct {
 152                         struct lttng_channel chan;
 153                 } channel;
 154                 /* Context */
 155                 struct {
 156                         char channel_name[NAME_MAX];
 157                         char event_name[NAME_MAX];
 158                         struct lttng_event_context ctx;
 159                 } context;
 160                 /* Use by register_consumer */
 161                 struct {
 162                         char path[PATH_MAX];
 163                 } reg;
 164                 /* List */
 165                 struct {
 166                         char channel_name[NAME_MAX];
 167                 } list;
 168                 struct lttng_calibrate calibrate;
 169         } u;
 170 };
 171
 172 /*
 173  * Data structure for the response from sessiond to the lttng client.
 174  */
 175 struct lttcomm_lttng_msg {
 176         uint32_t cmd_type;   /* enum lttcomm_sessiond_command */
 177         uint32_t ret_code;   /* enum lttcomm_return_code */
 178         uint32_t pid;        /* pid_t */
 179         uint32_t data_size;
 180         /* Contains: trace_name + data */
 181         char payload[];
 182 };
 183
 184 /*
 185  * Data structures for the kconsumerd communications
 186  *
 187  * The header structure is sent to the kconsumerd daemon to inform
 188  * how many lttcomm_kconsumerd_msg it is about to receive
 189  */
 190 struct lttcomm_kconsumerd_header {
 191         uint32_t payload_size;
 192         uint32_t cmd_type;      /* enum kconsumerd_command */
 193 };
 194
 195 /* lttcomm_kconsumerd_msg represents a file descriptor to consume the
 196  * data and a path name to write it
 197  */
 198 struct lttcomm_kconsumerd_msg {
 199         char path_name[PATH_MAX];
 200         int fd;
 201         uint32_t state;    /* enum lttcomm_kconsumerd_fd_state */
 202         unsigned long max_sb_size; /* the subbuffer size for this channel */
 203         enum lttng_event_output output; /* use splice or mmap to consume this fd */
 204 };
 205
 206 /*
 207  * Data structure for the commands sent from sessiond to UST.
 208  */
 209 struct lttcomm_ust_msg {
 210         uint32_t cmd_type;    /* enum lttcomm_ust_command */
 211         uint32_t handle;
 212         uint32_t cmd;
 213         union {
 214                 struct lttng_ust_tracer_version version;
 215                 struct lttng_ust_channel channel;
 216                 struct lttng_ust_event event;
 217                 struct lttng_ust_context context;
 218         } u;
 219 };
 220
 221 /*
 222  * Data structure for the response from UST to the session daemon.
 223  * cmd_type is sent back in the reply for validation.
 224  */
 225 struct lttcomm_ust_reply {
 226         uint32_t handle;
 227         uint32_t cmd;
 228         uint32_t ret_code;      /* enum lttcomm_return_code */
 229         uint32_t ret_val;       /* return value */
 230         union {
 231         } u;
 232 };
 233
 234 extern int lttcomm_create_unix_sock(const char *pathname);
 235 extern int lttcomm_connect_unix_sock(const char *pathname);
 236 extern int lttcomm_accept_unix_sock(int sock);
 237 extern int lttcomm_listen_unix_sock(int sock);
 238 extern int lttcomm_close_unix_sock(int sock);
 239 /* Send fd(s) over a unix socket. */
 240 extern ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds,
 241                 size_t nb_fd, size_t len);
 242 extern ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len);
 243 extern ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len);
 244 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
 245
 246 #endif  /* _LTTNG_SESSIOND_COMM_H */