include/ust/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
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; only version 2
   8  * of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18  */
  19
  20 #ifndef _LTTNG_UST_CTL_H
  21 #define _LTTNG_UST_CTL_H
  22
  23 #include <ust/lttng-ust-abi.h>
  24
  25 /*
  26  * Tracer channel attributes.
  27  */
  28 struct lttng_ust_channel_attr {
  29         int overwrite;                          /* 1: overwrite, 0: discard */
  30         uint64_t subbuf_size;                   /* bytes */
  31         uint64_t num_subbuf;                    /* power of 2 */
  32         unsigned int switch_timer_interval;     /* usec */
  33         unsigned int read_timer_interval;       /* usec */
  34         enum lttng_ust_output output;           /* splice, mmap */
  35 };
  36
  37 struct object_data {
  38         int handle;
  39         int shm_fd;
  40         int wait_fd;
  41         uint64_t memory_map_size;
  42 };
  43
  44 int ustctl_create_session(int sock);
  45 int ustctl_open_metadata(int sock, int session_handle,
  46                 struct lttng_ust_channel_attr *chops,
  47                 struct object_data **metadata_data);
  48 int ustctl_create_channel(int sock, int session_handle,
  49                 struct lttng_ust_channel_attr *chops,
  50                 struct object_data **channel_data);
  51 int ustctl_create_stream(int sock, struct object_data *channel_data,
  52                 struct object_data **stream_data);
  53 int ustctl_create_event(int sock, struct lttng_ust_event *ev,
  54                 struct object_data *channel_data,
  55                 struct object_data **event_data);
  56 int ustctl_add_context(int sock, struct lttng_ust_context *ctx,
  57                 struct object_data *channel_data,
  58                 struct object_data **context_data);
  59
  60 int ustctl_enable(int sock, struct object_data *object);
  61 int ustctl_disable(int sock, struct object_data *object);
  62 int ustctl_start_session(int sock, struct object_data *object);
  63 int ustctl_stop_session(int sock, struct object_data *object);
  64
  65 int ustctl_tracepoint_list(int sock);   /* not implemented yet */
  66 int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v);
  67 int ustctl_wait_quiescent(int sock);
  68
  69 /* not implemented yet */
  70 struct lttng_ust_calibrate;
  71 int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate);
  72
  73 /*
  74  * Map channel shm_handle and add streams. Typically performed by the
  75  * consumer to map the objects into its memory space.
  76  */
  77 struct shm_handle *ustctl_map_channel(struct object_data *chan_data);
  78 int ustctl_add_stream(struct shm_handle *shm_handle,
  79                 struct object_data *stream_data);
  80 /*
  81  * Note: the object_data from which the shm_handle is derived can only
  82  * be released after unmapping the handle.
  83  */
  84 void ustctl_unmap_channel(struct shm_handle *shm_handle);
  85
  86 /* Buffer operations */
  87
  88 struct shm_handle;
  89 struct lib_ring_buffer;
  90
  91 void *ustctl_get_mmap_base(struct shm_handle *handle,
  92                 struct lib_ring_buffer *buf);
  93
  94 /* Open/close stream buffers for read */
  95 struct lib_ring_buffer *ustctl_open_stream_read(struct shm_handle *handle,
  96                 int cpu);
  97 void ustctl_close_stream_read(struct shm_handle *handle,
  98                 struct lib_ring_buffer *buf);
  99
 100 /* For mmap mode, readable without "get" operation */
 101 int ustctl_get_mmap_len(struct shm_handle *handle,
 102                 struct lib_ring_buffer *buf,
 103                 unsigned long *len);
 104 int ustctl_get_max_subbuf_size(struct shm_handle *handle,
 105                 struct lib_ring_buffer *buf,
 106                 unsigned long *len);
 107
 108 /*
 109  * For mmap mode, operate on the current packet (between get/put or
 110  * get_next/put_next).
 111  */
 112 void *ustctl_get_mmap_base(struct shm_handle *handle,
 113                 struct lib_ring_buffer *buf);
 114 int ustctl_get_mmap_read_offset(struct shm_handle *handle,
 115                 struct lib_ring_buffer *buf, unsigned long *off);
 116 int ustctl_get_subbuf_size(struct shm_handle *handle,
 117                 struct lib_ring_buffer *buf, unsigned long *len);
 118 int ustctl_get_padded_subbuf_size(struct shm_handle *handle,
 119                 struct lib_ring_buffer *buf, unsigned long *len);
 120 int ustctl_get_next_subbuf(struct shm_handle *handle,
 121                 struct lib_ring_buffer *buf);
 122 int ustctl_put_next_subbuf(struct shm_handle *handle,
 123                 struct lib_ring_buffer *buf);
 124
 125 /* snapshot */
 126
 127 int ustctl_snapshot(struct shm_handle *handle,
 128                 struct lib_ring_buffer *buf);
 129 int ustctl_snapshot_get_consumed(struct shm_handle *handle,
 130                 struct lib_ring_buffer *buf, unsigned long *pos);
 131 int ustctl_snapshot_get_produced(struct shm_handle *handle,
 132                 struct lib_ring_buffer *buf, unsigned long *pos);
 133 int ustctl_get_subbuf(struct shm_handle *handle,
 134                 struct lib_ring_buffer *buf, unsigned long *pos);
 135 int ustctl_put_subbuf(struct shm_handle *handle,
 136                 struct lib_ring_buffer *buf);
 137
 138 /* Release object created by members of this API */
 139 void release_object(int sock, struct object_data *data);
 140
 141 #endif /* _LTTNG_UST_CTL_H */