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