| 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_TRACE_KERNEL_H |
| 19 | #define _LTT_TRACE_KERNEL_H |
| 20 | |
| 21 | #include <urcu/list.h> |
| 22 | |
| 23 | #include <lttng/lttng.h> |
| 24 | #include <common/lttng-kernel.h> |
| 25 | |
| 26 | #include "consumer.h" |
| 27 | |
| 28 | /* Kernel event list */ |
| 29 | struct ltt_kernel_event_list { |
| 30 | struct cds_list_head head; |
| 31 | }; |
| 32 | |
| 33 | /* Channel stream list */ |
| 34 | struct ltt_kernel_stream_list { |
| 35 | struct cds_list_head head; |
| 36 | }; |
| 37 | |
| 38 | /* Channel list */ |
| 39 | struct ltt_kernel_channel_list { |
| 40 | struct cds_list_head head; |
| 41 | }; |
| 42 | |
| 43 | /* Kernel event */ |
| 44 | struct ltt_kernel_event { |
| 45 | int fd; |
| 46 | int enabled; |
| 47 | /* |
| 48 | * TODO: need internal representation to support more than a |
| 49 | * single context. |
| 50 | */ |
| 51 | struct lttng_kernel_context *ctx; |
| 52 | struct lttng_kernel_event *event; |
| 53 | struct cds_list_head list; |
| 54 | }; |
| 55 | |
| 56 | /* Kernel channel */ |
| 57 | struct ltt_kernel_channel { |
| 58 | int fd; |
| 59 | int enabled; |
| 60 | unsigned int stream_count; |
| 61 | unsigned int event_count; |
| 62 | /* |
| 63 | * TODO: need internal representation to support more than a |
| 64 | * single context. |
| 65 | */ |
| 66 | struct lttng_kernel_context *ctx; |
| 67 | struct lttng_channel *channel; |
| 68 | struct ltt_kernel_event_list events_list; |
| 69 | struct ltt_kernel_stream_list stream_list; |
| 70 | struct cds_list_head list; |
| 71 | }; |
| 72 | |
| 73 | /* Metadata */ |
| 74 | struct ltt_kernel_metadata { |
| 75 | int fd; |
| 76 | struct lttng_channel *conf; |
| 77 | }; |
| 78 | |
| 79 | /* Channel stream */ |
| 80 | struct ltt_kernel_stream { |
| 81 | int fd; |
| 82 | int state; |
| 83 | /* Format is %s_%d respectively channel name and CPU number. */ |
| 84 | char name[LTTNG_SYMBOL_NAME_LEN]; |
| 85 | struct cds_list_head list; |
| 86 | }; |
| 87 | |
| 88 | /* Kernel session */ |
| 89 | struct ltt_kernel_session { |
| 90 | int fd; |
| 91 | int metadata_stream_fd; |
| 92 | int consumer_fds_sent; |
| 93 | unsigned int channel_count; |
| 94 | unsigned int stream_count_global; |
| 95 | char *trace_path; |
| 96 | struct ltt_kernel_metadata *metadata; |
| 97 | struct ltt_kernel_channel_list channel_list; |
| 98 | /* UID/GID of the user owning the session */ |
| 99 | uid_t uid; |
| 100 | gid_t gid; |
| 101 | /* |
| 102 | * Two consumer_output object are needed where one is needed for the |
| 103 | * current output object and the second one is the temporary object used to |
| 104 | * store URI being set by the lttng_set_consumer_uri call. Once |
| 105 | * lttng_enable_consumer is called, the two pointers are swapped. |
| 106 | */ |
| 107 | struct consumer_output *consumer; |
| 108 | struct consumer_output *tmp_consumer; |
| 109 | }; |
| 110 | |
| 111 | /* |
| 112 | * Lookup functions. NULL is returned if not found. |
| 113 | */ |
| 114 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
| 115 | char *name, struct ltt_kernel_channel *channel); |
| 116 | struct ltt_kernel_channel *trace_kernel_get_channel_by_name( |
| 117 | char *name, struct ltt_kernel_session *session); |
| 118 | |
| 119 | /* |
| 120 | * Create functions malloc() the data structure. |
| 121 | */ |
| 122 | struct ltt_kernel_session *trace_kernel_create_session(char *path); |
| 123 | struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path); |
| 124 | struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev); |
| 125 | struct ltt_kernel_metadata *trace_kernel_create_metadata(void); |
| 126 | struct ltt_kernel_stream *trace_kernel_create_stream(const char *name, |
| 127 | unsigned int count); |
| 128 | |
| 129 | /* |
| 130 | * Destroy functions free() the data structure and remove from linked list if |
| 131 | * it's applies. |
| 132 | */ |
| 133 | void trace_kernel_destroy_session(struct ltt_kernel_session *session); |
| 134 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata); |
| 135 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel); |
| 136 | void trace_kernel_destroy_event(struct ltt_kernel_event *event); |
| 137 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream); |
| 138 | |
| 139 | #endif /* _LTT_TRACE_KERNEL_H */ |