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 <stdint.h>
  30 #include <limits.h>
  31 #include <unistd.h>
  32 #include <lttng/ust-abi.h>
  33 #include <lttng/ust-error.h>
  34 #include <lttng/ust-compiler.h>
  35 #include <lttng/ust-ctl.h>
  36 #include <config.h>
  37
  38 #ifndef LTTNG_PACKED
  39 #error "LTTNG_PACKED should be defined"
  40 #endif
  41
  42 /*
  43  * Default timeout the application waits for the sessiond to send its
  44  * "register done" command. Can be overridden with the environment
  45  * variable "LTTNG_UST_REGISTER_TIMEOUT". Note that if the sessiond is not
  46  * found, the application proceeds directly without any delay.
  47  */
  48 #define LTTNG_UST_DEFAULT_CONSTRUCTOR_TIMEOUT_MS        CONFIG_LTTNG_UST_DEFAULT_CONSTRUCTOR_TIMEOUT_MS
  49
  50 #define LTTNG_DEFAULT_RUNDIR                            LTTNG_SYSTEM_RUNDIR
  51 #define LTTNG_DEFAULT_HOME_RUNDIR                       ".lttng"
  52
  53 /* Queue size of listen(2) */
  54 #define LTTNG_UST_COMM_MAX_LISTEN                       10
  55 #define LTTNG_UST_COMM_REG_MSG_PADDING                  64
  56
  57 struct lttng_event_field;
  58 struct lttng_ctx_field;
  59 struct lttng_enum_entry;
  60 struct lttng_integer_type;
  61 struct lttng_session;
  62
  63 struct ustctl_reg_msg {
  64         uint32_t magic;
  65         uint32_t major;
  66         uint32_t minor;
  67         uint32_t pid;
  68         uint32_t ppid;
  69         uint32_t uid;
  70         uint32_t gid;
  71         uint32_t bits_per_long;
  72         uint32_t uint8_t_alignment;
  73         uint32_t uint16_t_alignment;
  74         uint32_t uint32_t_alignment;
  75         uint32_t uint64_t_alignment;
  76         uint32_t long_alignment;
  77         uint32_t socket_type;                   /* enum ustctl_socket_type */
  78         char name[LTTNG_UST_ABI_PROCNAME_LEN];  /* process name */
  79         char padding[LTTNG_UST_COMM_REG_MSG_PADDING];
  80 } LTTNG_PACKED;
  81
  82 /*
  83  * Data structure for the commands sent from sessiond to UST.
  84  */
  85 #define USTCOMM_MSG_PADDING1            32
  86 #define USTCOMM_MSG_PADDING2            32
  87 struct ustcomm_ust_msg {
  88         uint32_t handle;
  89         uint32_t cmd;
  90         char padding[USTCOMM_MSG_PADDING1];
  91         union {
  92                 struct lttng_ust_trigger trigger;
  93                 struct lttng_ust_channel channel;
  94                 struct lttng_ust_stream stream;
  95                 struct lttng_ust_event event;
  96                 struct lttng_ust_context context;
  97                 struct lttng_ust_tracer_version version;
  98                 struct lttng_ust_tracepoint_iter tracepoint;
  99                 struct {
 100                         uint32_t data_size;     /* following filter data */
 101                         uint32_t reloc_offset;
 102                         uint64_t seqnum;
 103                 } LTTNG_PACKED filter;
 104                 struct {
 105                         uint32_t count; /* how many names follow */
 106                 } LTTNG_PACKED exclusion;
 107                 struct {
 108                         uint32_t data_size;     /* following capture data */
 109                         uint32_t reloc_offset;
 110                         uint64_t seqnum;
 111                 } LTTNG_PACKED capture;
 112                 char padding[USTCOMM_MSG_PADDING2];
 113         } u;
 114 } LTTNG_PACKED;
 115
 116 /*
 117  * Data structure for the response from UST to the session daemon.
 118  * cmd_type is sent back in the reply for validation.
 119  */
 120 #define USTCOMM_REPLY_PADDING1          32
 121 #define USTCOMM_REPLY_PADDING2          32
 122 struct ustcomm_ust_reply {
 123         uint32_t handle;
 124         uint32_t cmd;
 125         int32_t ret_code;       /* enum ustcomm_return_code */
 126         uint32_t ret_val;       /* return value */
 127         char padding[USTCOMM_REPLY_PADDING1];
 128         union {
 129                 struct {
 130                         uint64_t memory_map_size;
 131                 } LTTNG_PACKED channel;
 132                 struct {
 133                         uint64_t memory_map_size;
 134                 } LTTNG_PACKED stream;
 135                 struct lttng_ust_tracer_version version;
 136                 struct lttng_ust_tracepoint_iter tracepoint;
 137                 char padding[USTCOMM_REPLY_PADDING2];
 138         } u;
 139 } LTTNG_PACKED;
 140
 141 struct ustcomm_notify_hdr {
 142         uint32_t notify_cmd;
 143 } LTTNG_PACKED;
 144
 145 #define USTCOMM_NOTIFY_EVENT_MSG_PADDING        32
 146 struct ustcomm_notify_event_msg {
 147         uint32_t session_objd;
 148         uint32_t channel_objd;
 149         char event_name[LTTNG_UST_SYM_NAME_LEN];
 150         int32_t loglevel;
 151         uint32_t signature_len;
 152         uint32_t fields_len;
 153         uint32_t model_emf_uri_len;
 154         char padding[USTCOMM_NOTIFY_EVENT_MSG_PADDING];
 155         /* followed by signature, fields, and model_emf_uri */
 156 } LTTNG_PACKED;
 157
 158 #define USTCOMM_NOTIFY_EVENT_REPLY_PADDING      32
 159 struct ustcomm_notify_event_reply {
 160         int32_t ret_code;       /* 0: ok, negative: error code */
 161         uint32_t event_id;
 162         char padding[USTCOMM_NOTIFY_EVENT_REPLY_PADDING];
 163 } LTTNG_PACKED;
 164
 165 #define USTCOMM_NOTIFY_ENUM_MSG_PADDING         32
 166 struct ustcomm_notify_enum_msg {
 167         uint32_t session_objd;
 168         char enum_name[LTTNG_UST_SYM_NAME_LEN];
 169         uint32_t entries_len;
 170         char padding[USTCOMM_NOTIFY_ENUM_MSG_PADDING];
 171         /* followed by enum entries */
 172 } LTTNG_PACKED;
 173
 174 #define USTCOMM_NOTIFY_EVENT_REPLY_PADDING      32
 175 struct ustcomm_notify_enum_reply {
 176         int32_t ret_code;       /* 0: ok, negative: error code */
 177         uint64_t enum_id;
 178         char padding[USTCOMM_NOTIFY_EVENT_REPLY_PADDING];
 179 } LTTNG_PACKED;
 180
 181 #define USTCOMM_NOTIFY_CHANNEL_MSG_PADDING      32
 182 struct ustcomm_notify_channel_msg {
 183         uint32_t session_objd;
 184         uint32_t channel_objd;
 185         uint32_t ctx_fields_len;
 186         char padding[USTCOMM_NOTIFY_CHANNEL_MSG_PADDING];
 187         /* followed by context fields */
 188 } LTTNG_PACKED;
 189
 190 #define USTCOMM_NOTIFY_CHANNEL_REPLY_PADDING    32
 191 struct ustcomm_notify_channel_reply {
 192         int32_t ret_code;       /* 0: ok, negative: error code */
 193         uint32_t chan_id;
 194         uint32_t header_type;   /* enum ustctl_channel_header */
 195         char padding[USTCOMM_NOTIFY_CHANNEL_REPLY_PADDING];
 196 } LTTNG_PACKED;
 197
 198 /*
 199  * LTTNG_UST_TRACEPOINT_FIELD_LIST reply is followed by a
 200  * struct lttng_ust_field_iter field.
 201  */
 202
 203 extern int ustcomm_create_unix_sock(const char *pathname);
 204 extern int ustcomm_connect_unix_sock(const char *pathname,
 205                 long timeout);
 206 extern int ustcomm_accept_unix_sock(int sock);
 207 extern int ustcomm_listen_unix_sock(int sock);
 208 extern int ustcomm_close_unix_sock(int sock);
 209
 210 extern ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len);
 211 extern ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len);
 212 extern ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd);
 213 extern ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd);
 214
 215 extern const char *ustcomm_get_readable_code(int code);
 216 extern int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum);
 217 extern int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur,
 218                 uint32_t expected_handle, uint32_t expected_cmd);
 219 extern int ustcomm_send_app_cmd(int sock,
 220                 struct ustcomm_ust_msg *lum,
 221                 struct ustcomm_ust_reply *lur);
 222 int ustcomm_recv_fd(int sock);
 223
 224 ssize_t ustcomm_recv_channel_from_sessiond(int sock,
 225                 void **chan_data, uint64_t len, int *wakeup_fd);
 226 int ustcomm_recv_stream_from_sessiond(int sock,
 227                 uint64_t *memory_map_size,
 228                 int *shm_fd, int *wakeup_fd);
 229 ssize_t ustcomm_recv_trigger_notif_fd_from_sessiond(int sock,
 230                 int *trigger_notif_fd);
 231
 232 /*
 233  * Returns 0 on success, negative error value on error.
 234  * Returns -EPIPE or -ECONNRESET if other end has hung up.
 235  */
 236 int ustcomm_send_reg_msg(int sock,
 237                 enum ustctl_socket_type type,
 238                 uint32_t bits_per_long,
 239                 uint32_t uint8_t_alignment,
 240                 uint32_t uint16_t_alignment,
 241                 uint32_t uint32_t_alignment,
 242                 uint32_t uint64_t_alignment,
 243                 uint32_t long_alignment);
 244
 245 /*
 246  * Returns 0 on success, negative error value on error.
 247  * Returns -EPIPE or -ECONNRESET if other end has hung up.
 248  */
 249 int ustcomm_register_event(int sock,
 250         struct lttng_session *session,
 251         int session_objd,               /* session descriptor */
 252         int channel_objd,               /* channel descriptor */
 253         const char *event_name,         /* event name (input) */
 254         int loglevel,
 255         const char *signature,          /* event signature (input) */
 256         size_t nr_fields,               /* fields */
 257         const struct lttng_event_field *fields,
 258         const char *model_emf_uri,
 259         uint32_t *id);                  /* event id (output) */
 260
 261 /*
 262  * Returns 0 on success, negative error value on error.
 263  * Returns -EPIPE or -ECONNRESET if other end has hung up.
 264  */
 265 int ustcomm_register_enum(int sock,
 266         int session_objd,               /* session descriptor */
 267         const char *enum_name,          /* enum name (input) */
 268         size_t nr_entries,              /* entries */
 269         const struct lttng_enum_entry *entries,
 270         uint64_t *id);                  /* enum id (output) */
 271
 272 /*
 273  * Returns 0 on success, negative error value on error.
 274  * Returns -EPIPE or -ECONNRESET if other end has hung up.
 275  */
 276 int ustcomm_register_channel(int sock,
 277         struct lttng_session *session,
 278         int session_objd,               /* session descriptor */
 279         int channel_objd,               /* channel descriptor */
 280         size_t nr_ctx_fields,
 281         const struct lttng_ctx_field *ctx_fields,
 282         uint32_t *chan_id,              /* channel id (output) */
 283         int *header_type);              /* header type (output) */
 284
 285 int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec);
 286 int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec);
 287
 288 #endif  /* _LTTNG_UST_COMM_H */