Fix: cmd_rotate_session() returns unexpected error codes
[lttng-tools.git] / 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 enum lttng_error_code kernel_rotate_session(struct ltt_session *session);
67
68 int init_kernel_workarounds(void);
69 ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session,
70 int **_pids);
71 int kernel_supports_ring_buffer_snapshot_sample_positions(int tracer_fd);
72
73 #endif /* _LTT_KERNEL_CTL_H */
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