include/ust-comm.h

   1 #ifndef _LTTNG_UST_COMM_H
   2 #define _LTTNG_UST_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 library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library 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 GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 <unistd.h>
  31 #include <lttng/ust-abi.h>
  32 #include <lttng/ust-error.h>
  33 #include <lttng/ust-compiler.h>
  34 #include <lttng/ust-ctl.h>
  35 #include <config.h>
  36
  37 /*
  38  * Default timeout the application waits for the sessiond to send its
  39  * "register done" command. Can be overridden with the environment
  40  * variable "LTTNG_UST_REGISTER_TIMEOUT". Note that if the sessiond is not
  41  * found, the application proceeds directly without any delay.
  42  */
  43 #define LTTNG_UST_DEFAULT_CONSTRUCTOR_TIMEOUT_MS        3000
  44
  45 #define LTTNG_DEFAULT_RUNDIR                            LTTNG_SYSTEM_RUNDIR
  46 #define LTTNG_DEFAULT_HOME_RUNDIR                       ".lttng"
  47
  48 /* Queue size of listen(2) */
  49 #define LTTNG_UST_COMM_MAX_LISTEN                       10
  50 #define LTTNG_UST_COMM_REG_MSG_PADDING                  64
  51
  52 struct lttng_event_field;
  53 struct lttng_ctx_field;
  54 struct lttng_enum_entry;
  55 struct lttng_integer_type;
  56 struct lttng_session;
  57
  58 struct ustctl_reg_msg {
  59         uint32_t magic;
  60         uint32_t major;
  61         uint32_t minor;
  62         uint32_t pid;
  63         uint32_t ppid;
  64         uint32_t uid;
  65         uint32_t gid;
  66         uint32_t bits_per_long;
  67         uint32_t uint8_t_alignment;
  68         uint32_t uint16_t_alignment;
  69         uint32_t uint32_t_alignment;
  70         uint32_t uint64_t_alignment;
  71         uint32_t long_alignment;
  72         uint32_t socket_type;                   /* enum ustctl_socket_type */
  73         char name[LTTNG_UST_ABI_PROCNAME_LEN];  /* process name */
  74         char padding[LTTNG_UST_COMM_REG_MSG_PADDING];
  75 } LTTNG_PACKED;
  76
  77 /*
  78  * Data structure for the commands sent from sessiond to UST.
  79  */
  80 #define USTCOMM_MSG_PADDING1            32
  81 #define USTCOMM_MSG_PADDING2            32
  82 struct ustcomm_ust_msg {
  83         uint32_t handle;
  84         uint32_t cmd;
  85         char padding[USTCOMM_MSG_PADDING1];
  86         union {
  87                 struct lttng_ust_channel channel;
  88                 struct lttng_ust_stream stream;
  89                 struct lttng_ust_event event;
  90                 struct lttng_ust_context context;
  91                 struct lttng_ust_tracer_version version;
  92                 struct lttng_ust_tracepoint_iter tracepoint;
  93                 struct {
  94                         uint32_t data_size;     /* following filter data */
  95                         uint32_t reloc_offset;
  96                         uint64_t seqnum;
  97                 } LTTNG_PACKED filter;
  98                 struct {
  99                         uint32_t count; /* how many names follow */
 100                 } LTTNG_PACKED exclusion;
 101                 char padding[USTCOMM_MSG_PADDING2];
 102         } u;
 103 } LTTNG_PACKED;
 104
 105 /*
 106  * Data structure for the response from UST to the session daemon.
 107  * cmd_type is sent back in the reply for validation.
 108  */
 109 #define USTCOMM_REPLY_PADDING1          32
 110 #define USTCOMM_REPLY_PADDING2          32
 111 struct ustcomm_ust_reply {
 112         uint32_t handle;
 113         uint32_t cmd;
 114         int32_t ret_code;       /* enum ustcomm_return_code */
 115         uint32_t ret_val;       /* return value */
 116         char padding[USTCOMM_REPLY_PADDING1];
 117         union {
 118                 struct {
 119                         uint64_t memory_map_size;
 120                 } LTTNG_PACKED channel;
 121                 struct {
 122                         uint64_t memory_map_size;
 123                 } LTTNG_PACKED stream;
 124                 struct lttng_ust_tracer_version version;
 125                 struct lttng_ust_tracepoint_iter tracepoint;
 126                 char padding[USTCOMM_REPLY_PADDING2];
 127         } u;
 128 } LTTNG_PACKED;
 129
 130 struct ustcomm_notify_hdr {
 131         uint32_t notify_cmd;
 132 } LTTNG_PACKED;
 133
 134 #define USTCOMM_NOTIFY_EVENT_MSG_PADDING        32
 135 struct ustcomm_notify_event_msg {
 136         uint32_t session_objd;
 137         uint32_t channel_objd;
 138         char event_name[LTTNG_UST_SYM_NAME_LEN];
 139         int32_t loglevel;
 140         uint32_t signature_len;
 141         uint32_t fields_len;
 142         uint32_t model_emf_uri_len;
 143         char padding[USTCOMM_NOTIFY_EVENT_MSG_PADDING];
 144         /* followed by signature, fields, and model_emf_uri */
 145 } LTTNG_PACKED;
 146
 147 #define USTCOMM_NOTIFY_EVENT_REPLY_PADDING      32
 148 struct ustcomm_notify_event_reply {
 149         int32_t ret_code;       /* 0: ok, negative: error code */
 150         uint32_t event_id;
 151         char padding[USTCOMM_NOTIFY_EVENT_REPLY_PADDING];
 152 } LTTNG_PACKED;
 153
 154 #define USTCOMM_NOTIFY_ENUM_MSG_PADDING         32
 155 struct ustcomm_notify_enum_msg {
 156         uint32_t session_objd;
 157         char enum_name[LTTNG_UST_SYM_NAME_LEN];
 158         uint32_t entries_len;
 159         char padding[USTCOMM_NOTIFY_ENUM_MSG_PADDING];
 160         /* followed by enum entries */
 161 } LTTNG_PACKED;
 162
 163 #define USTCOMM_NOTIFY_EVENT_REPLY_PADDING      32
 164 struct ustcomm_notify_enum_reply {
 165         int32_t ret_code;       /* 0: ok, negative: error code */
 166         uint64_t enum_id;
 167         char padding[USTCOMM_NOTIFY_EVENT_REPLY_PADDING];
 168 } LTTNG_PACKED;
 169
 170 #define USTCOMM_NOTIFY_CHANNEL_MSG_PADDING      32
 171 struct ustcomm_notify_channel_msg {
 172         uint32_t session_objd;
 173         uint32_t channel_objd;
 174         uint32_t ctx_fields_len;
 175         char padding[USTCOMM_NOTIFY_CHANNEL_MSG_PADDING];
 176         /* followed by context fields */
 177 } LTTNG_PACKED;
 178
 179 #define USTCOMM_NOTIFY_CHANNEL_REPLY_PADDING    32
 180 struct ustcomm_notify_channel_reply {
 181         int32_t ret_code;       /* 0: ok, negative: error code */
 182         uint32_t chan_id;
 183         uint32_t header_type;   /* enum ustctl_channel_header */
 184         char padding[USTCOMM_NOTIFY_CHANNEL_REPLY_PADDING];
 185 } LTTNG_PACKED;
 186
 187 /*
 188  * LTTNG_UST_TRACEPOINT_FIELD_LIST reply is followed by a
 189  * struct lttng_ust_field_iter field.
 190  */
 191
 192 extern int ustcomm_create_unix_sock(const char *pathname);
 193 extern int ustcomm_connect_unix_sock(const char *pathname);
 194 extern int ustcomm_accept_unix_sock(int sock);
 195 extern int ustcomm_listen_unix_sock(int sock);
 196 extern int ustcomm_close_unix_sock(int sock);
 197
 198 extern ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len);
 199 extern ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len);
 200 extern ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd);
 201 extern ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd);
 202
 203 extern const char *ustcomm_get_readable_code(int code);
 204 extern int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum);
 205 extern int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur,
 206                 uint32_t expected_handle, uint32_t expected_cmd);
 207 extern int ustcomm_send_app_cmd(int sock,
 208                 struct ustcomm_ust_msg *lum,
 209                 struct ustcomm_ust_reply *lur);
 210 int ustcomm_recv_fd(int sock);
 211
 212 ssize_t ustcomm_recv_channel_from_sessiond(int sock,
 213                 void **chan_data, uint64_t len, int *wakeup_fd);
 214 int ustcomm_recv_stream_from_sessiond(int sock,
 215                 uint64_t *memory_map_size,
 216                 int *shm_fd, int *wakeup_fd);
 217
 218 /*
 219  * Returns 0 on success, negative error value on error.
 220  * Returns -EPIPE or -ECONNRESET if other end has hung up.
 221  */
 222 int ustcomm_send_reg_msg(int sock,
 223                 enum ustctl_socket_type type,
 224                 uint32_t bits_per_long,
 225                 uint32_t uint8_t_alignment,
 226                 uint32_t uint16_t_alignment,
 227                 uint32_t uint32_t_alignment,
 228                 uint32_t uint64_t_alignment,
 229                 uint32_t long_alignment);
 230
 231 /*
 232  * Returns 0 on success, negative error value on error.
 233  * Returns -EPIPE or -ECONNRESET if other end has hung up.
 234  */
 235 int ustcomm_register_event(int sock,
 236         struct lttng_session *session,
 237         int session_objd,               /* session descriptor */
 238         int channel_objd,               /* channel descriptor */
 239         const char *event_name,         /* event name (input) */
 240         int loglevel,
 241         const char *signature,          /* event signature (input) */
 242         size_t nr_fields,               /* fields */
 243         const struct lttng_event_field *fields,
 244         const char *model_emf_uri,
 245         uint32_t *id);                  /* event id (output) */
 246
 247 /*
 248  * Returns 0 on success, negative error value on error.
 249  * Returns -EPIPE or -ECONNRESET if other end has hung up.
 250  */
 251 int ustcomm_register_enum(int sock,
 252         int session_objd,               /* session descriptor */
 253         const char *enum_name,          /* enum name (input) */
 254         size_t nr_entries,              /* entries */
 255         const struct lttng_enum_entry *entries,
 256         uint64_t *id);                  /* enum id (output) */
 257
 258 /*
 259  * Returns 0 on success, negative error value on error.
 260  * Returns -EPIPE or -ECONNRESET if other end has hung up.
 261  */
 262 int ustcomm_register_channel(int sock,
 263         struct lttng_session *session,
 264         int session_objd,               /* session descriptor */
 265         int channel_objd,               /* channel descriptor */
 266         size_t nr_ctx_fields,
 267         const struct lttng_ctx_field *ctx_fields,
 268         uint32_t *chan_id,              /* channel id (output) */
 269         int *header_type);              /* header type (output) */
 270
 271 int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec);
 272 int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec);
 273
 274 #endif  /* _LTTNG_UST_COMM_H */