src/bin/lttng-sessiond/kernel.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #ifndef _LTT_KERNEL_CTL_H
  19 #define _LTT_KERNEL_CTL_H
  20
  21 #include "session.h"
  22 #include "snapshot.h"
  23 #include "trace-kernel.h"
  24
  25 /*
  26  * Default size for the event list when kernel_list_events is called. This size
  27  * value is based on the initial LTTng 2.0 version set of tracepoints.
  28  *
  29  * This is NOT an upper bound because if the real event list size is bigger,
  30  * dynamic reallocation is performed.
  31  */
  32 #define KERNEL_EVENT_INIT_LIST_SIZE 64
  33 #define KERNEL_TRACKER_PIDS_INIT_LIST_SIZE 64
  34
  35 int kernel_add_channel_context(struct ltt_kernel_channel *chan,
  36                 struct ltt_kernel_context *ctx);
  37 int kernel_create_session(struct ltt_session *session, int tracer_fd);
  38 int kernel_create_channel(struct ltt_kernel_session *session,
  39                 struct lttng_channel *chan);
  40 int kernel_create_event(struct lttng_event *ev, struct ltt_kernel_channel *channel,
  41                 char *filter_expression, struct lttng_filter_bytecode *filter);
  42 int kernel_disable_channel(struct ltt_kernel_channel *chan);
  43 int kernel_disable_event(struct ltt_kernel_event *event);
  44 int kernel_enable_event(struct ltt_kernel_event *event);
  45 int kernel_enable_channel(struct ltt_kernel_channel *chan);
  46 int kernel_track_pid(struct ltt_kernel_session *session, int pid);
  47 int kernel_untrack_pid(struct ltt_kernel_session *session, int pid);
  48 int kernel_open_metadata(struct ltt_kernel_session *session);
  49 int kernel_open_metadata_stream(struct ltt_kernel_session *session);
  50 int kernel_open_channel_stream(struct ltt_kernel_channel *channel);
  51 int kernel_flush_buffer(struct ltt_kernel_channel *channel);
  52 int kernel_metadata_flush_buffer(int fd);
  53 int kernel_start_session(struct ltt_kernel_session *session);
  54 int kernel_stop_session(struct ltt_kernel_session *session);
  55 ssize_t kernel_list_events(int tracer_fd, struct lttng_event **event_list);
  56 void kernel_wait_quiescent(int fd);
  57 int kernel_validate_version(int tracer_fd,
  58                 struct lttng_kernel_tracer_version *kernel_tracer_version,
  59                 struct lttng_kernel_tracer_abi_version *kernel_tracer_abi_version);
  60 void kernel_destroy_session(struct ltt_kernel_session *ksess);
  61 void kernel_destroy_channel(struct ltt_kernel_channel *kchan);
  62 int kernel_snapshot_record(struct ltt_kernel_session *ksess,
  63                 struct snapshot_output *output, int wait,
  64                 uint64_t nb_packets_per_stream);
  65 int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits);
  66
  67 int init_kernel_workarounds(void);
  68 ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session,
  69                 int **_pids);
  70 int kernel_supports_ring_buffer_snapshot_sample_positions(int tracer_fd);
  71
  72 #endif /* _LTT_KERNEL_CTL_H */