include/lttng/ust-ctl.h

   1 /*
   2  * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License only.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef _LTTNG_UST_CTL_H
  20 #define _LTTNG_UST_CTL_H
  21
  22 #include <lttng/ust-abi.h>
  23
  24 /*
  25  * Error values: all the following functions return:
  26  * >= 0: Success (LTTNG_UST_OK)
  27  * < 0: error code.
  28  */
  29 int ustctl_register_done(int sock);
  30 int ustctl_create_session(int sock);
  31 int ustctl_open_metadata(int sock, int session_handle,
  32                 struct lttng_ust_channel_attr *chops,
  33                 struct lttng_ust_object_data **metadata_data);
  34 int ustctl_create_channel(int sock, int session_handle,
  35                 struct lttng_ust_channel_attr *chops,
  36                 struct lttng_ust_object_data **channel_data);
  37 int ustctl_create_event(int sock, struct lttng_ust_event *ev,
  38                 struct lttng_ust_object_data *channel_data,
  39                 struct lttng_ust_object_data **event_data);
  40 int ustctl_add_context(int sock, struct lttng_ust_context *ctx,
  41                 struct lttng_ust_object_data *obj_data,
  42                 struct lttng_ust_object_data **context_data);
  43 int ustctl_set_filter(int sock, struct lttng_ust_filter_bytecode *bytecode,
  44                 struct lttng_ust_object_data *obj_data);
  45
  46 int ustctl_enable(int sock, struct lttng_ust_object_data *object);
  47 int ustctl_disable(int sock, struct lttng_ust_object_data *object);
  48 int ustctl_start_session(int sock, int handle);
  49 int ustctl_stop_session(int sock, int handle);
  50
  51 /*
  52  * Return -ENOENT if no more stream is available for creation.
  53  * Return 0 on success.
  54  * Return negative error value on system error.
  55  * Return positive error value on UST error.
  56  */
  57 int ustctl_create_stream(int sock, struct lttng_ust_object_data *channel_data,
  58                 struct lttng_ust_object_data **stream_data);
  59
  60 /*
  61  * ustctl_tracepoint_list returns a tracepoint list handle, or negative
  62  * error value.
  63  */
  64 int ustctl_tracepoint_list(int sock);
  65 /*
  66  * ustctl_tracepoint_list_get is used to iterate on the tp list
  67  * handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
  68  * returned.
  69  */
  70 int ustctl_tracepoint_list_get(int sock, int tp_list_handle,
  71                 struct lttng_ust_tracepoint_iter *iter);
  72
  73 /*
  74  * ustctl_tracepoint_field_list returns a tracepoint field list handle,
  75  * or negative error value.
  76  */
  77 int ustctl_tracepoint_field_list(int sock);
  78
  79 /*
  80  * ustctl_tracepoint_field_list_get is used to iterate on the tp field
  81  * list handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
  82  * returned.
  83  */
  84 int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
  85                 struct lttng_ust_field_iter *iter);
  86
  87 int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v);
  88 int ustctl_wait_quiescent(int sock);
  89
  90 int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object);
  91
  92 int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate);
  93
  94 /*
  95  * Map channel lttng_ust_shm_handle and add streams. Typically performed by the
  96  * consumer to map the objects into its memory space.
  97  */
  98 struct lttng_ust_shm_handle *ustctl_map_channel(struct lttng_ust_object_data *chan_data);
  99 int ustctl_add_stream(struct lttng_ust_shm_handle *lttng_ust_shm_handle,
 100                 struct lttng_ust_object_data *stream_data);
 101 /*
 102  * Note: the lttng_ust_object_data from which the lttng_ust_shm_handle is derived can only
 103  * be released after unmapping the handle.
 104  */
 105 void ustctl_unmap_channel(struct lttng_ust_shm_handle *lttng_ust_shm_handle);
 106
 107 /* Buffer operations */
 108
 109 struct lttng_ust_shm_handle;
 110 struct lttng_ust_lib_ring_buffer;
 111
 112 /* Open/close stream buffers for read */
 113 struct lttng_ust_lib_ring_buffer *ustctl_open_stream_read(struct lttng_ust_shm_handle *handle,
 114                 int cpu);
 115 void ustctl_close_stream_read(struct lttng_ust_shm_handle *handle,
 116                 struct lttng_ust_lib_ring_buffer *buf);
 117
 118 /* For mmap mode, readable without "get" operation */
 119 int ustctl_get_mmap_len(struct lttng_ust_shm_handle *handle,
 120                 struct lttng_ust_lib_ring_buffer *buf,
 121                 unsigned long *len);
 122 int ustctl_get_max_subbuf_size(struct lttng_ust_shm_handle *handle,
 123                 struct lttng_ust_lib_ring_buffer *buf,
 124                 unsigned long *len);
 125
 126 /*
 127  * For mmap mode, operate on the current packet (between get/put or
 128  * get_next/put_next).
 129  */
 130 void *ustctl_get_mmap_base(struct lttng_ust_shm_handle *handle,
 131                 struct lttng_ust_lib_ring_buffer *buf);
 132 int ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle *handle,
 133                 struct lttng_ust_lib_ring_buffer *buf, unsigned long *off);
 134 int ustctl_get_subbuf_size(struct lttng_ust_shm_handle *handle,
 135                 struct lttng_ust_lib_ring_buffer *buf, unsigned long *len);
 136 int ustctl_get_padded_subbuf_size(struct lttng_ust_shm_handle *handle,
 137                 struct lttng_ust_lib_ring_buffer *buf, unsigned long *len);
 138 int ustctl_get_next_subbuf(struct lttng_ust_shm_handle *handle,
 139                 struct lttng_ust_lib_ring_buffer *buf);
 140 int ustctl_put_next_subbuf(struct lttng_ust_shm_handle *handle,
 141                 struct lttng_ust_lib_ring_buffer *buf);
 142
 143 /* snapshot */
 144
 145 int ustctl_snapshot(struct lttng_ust_shm_handle *handle,
 146                 struct lttng_ust_lib_ring_buffer *buf);
 147 int ustctl_snapshot_get_consumed(struct lttng_ust_shm_handle *handle,
 148                 struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos);
 149 int ustctl_snapshot_get_produced(struct lttng_ust_shm_handle *handle,
 150                 struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos);
 151 int ustctl_get_subbuf(struct lttng_ust_shm_handle *handle,
 152                 struct lttng_ust_lib_ring_buffer *buf, unsigned long *pos);
 153 int ustctl_put_subbuf(struct lttng_ust_shm_handle *handle,
 154                 struct lttng_ust_lib_ring_buffer *buf);
 155
 156 void ustctl_flush_buffer(struct lttng_ust_shm_handle *handle,
 157                 struct lttng_ust_lib_ring_buffer *buf,
 158                 int producer_active);
 159
 160 /* Release object created by members of this API. */
 161 int ustctl_release_object(int sock, struct lttng_ust_object_data *data);
 162 /* Release handle returned by create session. */
 163 int ustctl_release_handle(int sock, int handle);
 164
 165 #endif /* _LTTNG_UST_CTL_H */