| 1 | /* |
| 2 | * event.c |
| 3 | * |
| 4 | * Linux Trace Toolkit Control Library |
| 5 | * |
| 6 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 7 | * |
| 8 | * This library is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, |
| 10 | * as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public License |
| 18 | * along with this library; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #define _LGPL_SOURCE |
| 23 | #include <lttng/event.h> |
| 24 | #include <lttng/lttng-error.h> |
| 25 | #include <stddef.h> |
| 26 | #include <common/sessiond-comm/sessiond-comm.h> |
| 27 | |
| 28 | int lttng_event_get_filter_expression(struct lttng_event *event, |
| 29 | const char **filter_expression) |
| 30 | { |
| 31 | int ret = 0; |
| 32 | struct lttcomm_event_extended_header *ext_header; |
| 33 | |
| 34 | if (!event || !filter_expression) { |
| 35 | ret = -LTTNG_ERR_INVALID; |
| 36 | goto end; |
| 37 | } |
| 38 | |
| 39 | ext_header = event->extended.ptr; |
| 40 | |
| 41 | if (!ext_header) { |
| 42 | /* |
| 43 | * This can happen since the lttng_event structure is |
| 44 | * used for other tasks where this pointer is never set. |
| 45 | */ |
| 46 | *filter_expression = NULL; |
| 47 | goto end; |
| 48 | } |
| 49 | |
| 50 | if (ext_header->filter_len) { |
| 51 | *filter_expression = ((const char *) (ext_header)) + |
| 52 | sizeof(*ext_header); |
| 53 | } else { |
| 54 | *filter_expression = NULL; |
| 55 | } |
| 56 | |
| 57 | end: |
| 58 | return ret; |
| 59 | } |
| 60 | |
| 61 | int lttng_event_get_exclusion_name_count(struct lttng_event *event) |
| 62 | { |
| 63 | int ret; |
| 64 | struct lttcomm_event_extended_header *ext_header; |
| 65 | |
| 66 | if (!event) { |
| 67 | ret = -LTTNG_ERR_INVALID; |
| 68 | goto end; |
| 69 | } |
| 70 | |
| 71 | ext_header = event->extended.ptr; |
| 72 | if (!ext_header) { |
| 73 | /* |
| 74 | * This can happen since the lttng_event structure is |
| 75 | * used for other tasks where this pointer is never set. |
| 76 | */ |
| 77 | ret = 0; |
| 78 | goto end; |
| 79 | } |
| 80 | |
| 81 | if (ext_header->nb_exclusions > INT_MAX) { |
| 82 | ret = -LTTNG_ERR_OVERFLOW; |
| 83 | goto end; |
| 84 | } |
| 85 | ret = (int) ext_header->nb_exclusions; |
| 86 | end: |
| 87 | return ret; |
| 88 | } |
| 89 | |
| 90 | int lttng_event_get_exclusion_name(struct lttng_event *event, |
| 91 | size_t index, const char **exclusion_name) |
| 92 | { |
| 93 | int ret = 0; |
| 94 | struct lttcomm_event_extended_header *ext_header; |
| 95 | void *at; |
| 96 | |
| 97 | if (!event || !exclusion_name) { |
| 98 | ret = -LTTNG_ERR_INVALID; |
| 99 | goto end; |
| 100 | } |
| 101 | |
| 102 | ext_header = event->extended.ptr; |
| 103 | if (!ext_header) { |
| 104 | ret = -LTTNG_ERR_INVALID; |
| 105 | goto end; |
| 106 | } |
| 107 | |
| 108 | if (index >= ext_header->nb_exclusions) { |
| 109 | ret = -LTTNG_ERR_INVALID; |
| 110 | goto end; |
| 111 | } |
| 112 | |
| 113 | at = (void *) ext_header + sizeof(*ext_header); |
| 114 | at += ext_header->filter_len; |
| 115 | at += index * LTTNG_SYMBOL_NAME_LEN; |
| 116 | *exclusion_name = at; |
| 117 | |
| 118 | end: |
| 119 | return ret; |
| 120 | } |