projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| f2c1f0d4 MD |
1 | /* |
| 2 | * Copyright (C) 2019 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
| 3 | * Copyright (C) 2019 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 4 | * | |
| 5 | * This library is free software; you can redistribute it and/or modify it | |
| 6 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
| 7 | * as published by the Free Software Foundation. | |
| 8 | * | |
| 9 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
| 12 | * for more details. | |
| 13 | * | |
| 14 | * You should have received a copy of the GNU Lesser General Public License | |
| 15 | * along with this library; if not, write to the Free Software Foundation, | |
| 16 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 17 | */ | |
| 18 | ||
| 19 | #ifndef LTTNG_CLEAR_H | |
| 20 | #define LTTNG_CLEAR_H | |
| 21 | ||
| 22 | #include <lttng/lttng-error.h> | |
| 23 | ||
| 24 | #ifdef __cplusplus | |
| 25 | extern "C" { | |
| 26 | #endif | |
| 27 | ||
| 28 | struct lttng_clear_handle; | |
| 29 | ||
| 30 | /* | |
| 31 | * Clear a tracing session. | |
| 32 | * | |
| 33 | * Clear the data buffers and trace data. | |
| 34 | * | |
| 35 | * For sessions saving trace data to disk and streaming over the network to a | |
| 36 | * relay daemon, the buffers content and existing stream files are cleared when | |
| 37 | * the clear command is issued. | |
| 38 | * | |
| 39 | * For snapshot sessions (flight recorder), only the buffer content is cleared. | |
| 40 | * Prior snapshots are individually recorded to disk, and are therefore | |
| 41 | * untouched by this "clear" command. | |
| 42 | * | |
| 43 | * For live sessions streaming over network to a relay daemon, the buffers | |
| 44 | * will be cleared and the files on the relay daemon side will be cleared as | |
| 45 | * well. However, any active live trace viewer currently reading an existing | |
| 46 | * trace packet will be able to proceed to read that packet entirely before | |
| 47 | * skipping over cleared stream data. | |
| 48 | * | |
| 49 | * The clear command guarantees that no trace data produced before this function | |
| 50 | * is called will be present in the resulting trace. | |
| 51 | * | |
| 52 | * Trace data produced between the moment this function is called and when it | |
| 53 | * returns might be present in the resulting trace. | |
| 54 | * | |
| 55 | * Provides an lttng_clear_handle which can be used to wait for the completion | |
| 56 | * of the session's clear. | |
| 57 | * | |
| 58 | * Return LTTNG_OK on success else a negative LTTng error code. The returned | |
| 59 | * handle is owned by the caller and must be free'd using | |
| 60 | * lttng_clear_handle_destroy(). | |
| 61 | * | |
| 62 | * Important error codes: | |
| 63 | * LTTNG_ERR_CLEAR_RELAY_DISALLOWED | |
| 64 | * LTTNG_ERR_CLEAR_NOT_AVAILABLE_RELAY | |
| 65 | * LTTNG_ERR_CLEAR_FAIL_CONSUMER | |
| 66 | */ | |
| 67 | extern enum lttng_error_code lttng_clear_session(const char *session_name, | |
| 68 | struct lttng_clear_handle **handle); | |
| 69 | ||
| 70 | #endif /* LTTNG_CLEAR_H */ |