| 1 | /* |
| 2 | * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #ifndef SESSIOND_TRACE_CHUNK_REGISTRY_H |
| 9 | #define SESSIOND_TRACE_CHUNK_REGISTRY_H |
| 10 | |
| 11 | #include <common/uuid.h> |
| 12 | #include <common/trace-chunk.h> |
| 13 | #include <stdint.h> |
| 14 | |
| 15 | /* |
| 16 | * A session trace chunk registry allows the relay daemon to share trace chunks |
| 17 | * used by different "relay sessions" when they were created for the same |
| 18 | * user-visible session daemon session. Tracing multiple domains (e.g. ust and |
| 19 | * kernel) results in per-domain relay sessions being created. |
| 20 | * |
| 21 | * Sharing trace chunks, and their output directory more specifically, is |
| 22 | * essential to properly implement session rotations. The sharing of output |
| 23 | * directory handles allows directory renames to be performed once and without |
| 24 | * races that would stem from from multiple renames. |
| 25 | */ |
| 26 | struct sessiond_trace_chunk_registry; |
| 27 | |
| 28 | struct sessiond_trace_chunk_registry * |
| 29 | sessiond_trace_chunk_registry_create(void); |
| 30 | |
| 31 | void sessiond_trace_chunk_registry_destroy( |
| 32 | struct sessiond_trace_chunk_registry *sessiond_registry); |
| 33 | |
| 34 | int sessiond_trace_chunk_registry_session_created( |
| 35 | struct sessiond_trace_chunk_registry *sessiond_registry, |
| 36 | const lttng_uuid sessiond_uuid); |
| 37 | |
| 38 | int sessiond_trace_chunk_registry_session_destroyed( |
| 39 | struct sessiond_trace_chunk_registry *sessiond_registry, |
| 40 | const lttng_uuid sessiond_uuid); |
| 41 | |
| 42 | struct lttng_trace_chunk *sessiond_trace_chunk_registry_publish_chunk( |
| 43 | struct sessiond_trace_chunk_registry *sessiond_registry, |
| 44 | const lttng_uuid sessiond_uuid, uint64_t session_id, |
| 45 | struct lttng_trace_chunk *chunk); |
| 46 | |
| 47 | struct lttng_trace_chunk * |
| 48 | sessiond_trace_chunk_registry_get_anonymous_chunk( |
| 49 | struct sessiond_trace_chunk_registry *sessiond_registry, |
| 50 | const lttng_uuid sessiond_uuid, |
| 51 | uint64_t session_id); |
| 52 | |
| 53 | struct lttng_trace_chunk * |
| 54 | sessiond_trace_chunk_registry_get_chunk( |
| 55 | struct sessiond_trace_chunk_registry *sessiond_registry, |
| 56 | const lttng_uuid sessiond_uuid, |
| 57 | uint64_t session_id, uint64_t chunk_id); |
| 58 | |
| 59 | int sessiond_trace_chunk_registry_chunk_exists( |
| 60 | struct sessiond_trace_chunk_registry *sessiond_registry, |
| 61 | const lttng_uuid sessiond_uuid, |
| 62 | uint64_t session_id, uint64_t chunk_id, bool *chunk_exists); |
| 63 | |
| 64 | #endif /* SESSIOND_TRACE_CHUNK_REGISTRY_H */ |