| 1 | /* |
| 2 | * Copyright (C) 2020 Philippe Proulx <pproulx@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #ifndef LTTNG_EVENT_FIELD_VALUE_H |
| 9 | #define LTTNG_EVENT_FIELD_VALUE_H |
| 10 | |
| 11 | #include <stdint.h> |
| 12 | |
| 13 | struct lttng_event_field_value; |
| 14 | |
| 15 | #ifdef __cplusplus |
| 16 | extern "C" { |
| 17 | #endif |
| 18 | |
| 19 | /* |
| 20 | * Types of a event field value expression. |
| 21 | */ |
| 22 | enum lttng_event_field_value_type { |
| 23 | /* |
| 24 | * Unknown. |
| 25 | */ |
| 26 | LTTNG_EVENT_FIELD_VALUE_TYPE_UNKNOWN = -2, |
| 27 | |
| 28 | /* |
| 29 | * Returned by lttng_event_field_value_get_type() with an |
| 30 | * invalid parameter. |
| 31 | */ |
| 32 | LTTNG_EVENT_FIELD_VALUE_TYPE_INVALID = -1, |
| 33 | |
| 34 | /* |
| 35 | * Unsigned integer event field value. |
| 36 | */ |
| 37 | LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_INT = 0, |
| 38 | |
| 39 | /* |
| 40 | * Signed integer event field value. |
| 41 | */ |
| 42 | LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_INT = 1, |
| 43 | |
| 44 | /* |
| 45 | * Unsigned enumeration event field value. |
| 46 | * |
| 47 | * This type conceptually inherits |
| 48 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_INT`. |
| 49 | */ |
| 50 | LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_ENUM = 2, |
| 51 | |
| 52 | /* |
| 53 | * Signed enumeration event field value. |
| 54 | * |
| 55 | * This type conceptually inherits |
| 56 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_INT`. |
| 57 | */ |
| 58 | LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_ENUM = 3, |
| 59 | |
| 60 | /* |
| 61 | * Real event field value. |
| 62 | */ |
| 63 | LTTNG_EVENT_FIELD_VALUE_TYPE_REAL = 4, |
| 64 | |
| 65 | /* |
| 66 | * String event field value. |
| 67 | */ |
| 68 | LTTNG_EVENT_FIELD_VALUE_TYPE_STRING = 5, |
| 69 | |
| 70 | /* |
| 71 | * Array event field value. |
| 72 | */ |
| 73 | LTTNG_EVENT_FIELD_VALUE_TYPE_ARRAY = 6, |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * Event field value API status codes. |
| 78 | */ |
| 79 | enum lttng_event_field_value_status { |
| 80 | /* |
| 81 | * Event field value is not available. |
| 82 | */ |
| 83 | LTTNG_EVENT_FIELD_VALUE_STATUS_UNAVAILABLE = -2, |
| 84 | |
| 85 | /* |
| 86 | * Invalid parameter. |
| 87 | */ |
| 88 | LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID = -1, |
| 89 | |
| 90 | /* |
| 91 | * Success. |
| 92 | */ |
| 93 | LTTNG_EVENT_FIELD_VALUE_STATUS_OK = 0, |
| 94 | }; |
| 95 | |
| 96 | /* |
| 97 | * Returns the type of the event field value `field_val`, or: |
| 98 | * |
| 99 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_UNKNOWN`: |
| 100 | * The type of `field_val` is unknown as of this version of the |
| 101 | * LTTng control library. |
| 102 | * |
| 103 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_INVALID`: |
| 104 | * `field_val` is `NULL`. |
| 105 | */ |
| 106 | extern enum lttng_event_field_value_type lttng_event_field_value_get_type( |
| 107 | const struct lttng_event_field_value *field_val); |
| 108 | |
| 109 | /* |
| 110 | * Sets `*val` to the raw value of the unsigned integer/enumeration |
| 111 | * event field value `field_val`. |
| 112 | * |
| 113 | * Returns: |
| 114 | * |
| 115 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_OK`: |
| 116 | * Success. |
| 117 | * |
| 118 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID`: |
| 119 | * * `field_val` is `NULL`. |
| 120 | * * The type of `field_val` is not |
| 121 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_INT` or |
| 122 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_ENUM`. |
| 123 | * * `val` is `NULL`. |
| 124 | */ |
| 125 | extern enum lttng_event_field_value_status |
| 126 | lttng_event_field_value_unsigned_int_get_value( |
| 127 | const struct lttng_event_field_value *field_val, uint64_t *val); |
| 128 | |
| 129 | /* |
| 130 | * Sets `*val` to the raw value of the signed integer/enumeration event |
| 131 | * field value `field_val`. |
| 132 | * |
| 133 | * Returns: |
| 134 | * |
| 135 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_OK`: |
| 136 | * Success. |
| 137 | * |
| 138 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID`: |
| 139 | * * `field_val` is `NULL`. |
| 140 | * * The type of `field_val` is not |
| 141 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_INT` or |
| 142 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_ENUM`. |
| 143 | * * `val` is `NULL`. |
| 144 | */ |
| 145 | extern enum lttng_event_field_value_status |
| 146 | lttng_event_field_value_signed_int_get_value( |
| 147 | const struct lttng_event_field_value *field_val, int64_t *val); |
| 148 | |
| 149 | /* |
| 150 | * Sets `*val` to the raw value of the real event field value |
| 151 | * `field_val`. |
| 152 | * |
| 153 | * Returns: |
| 154 | * |
| 155 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_OK`: |
| 156 | * Success. |
| 157 | * |
| 158 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID`: |
| 159 | * * `field_val` is `NULL`. |
| 160 | * * The type of `field_val` is not |
| 161 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_REAL`. |
| 162 | * * `val` is `NULL`. |
| 163 | */ |
| 164 | extern enum lttng_event_field_value_status |
| 165 | lttng_event_field_value_real_get_value( |
| 166 | const struct lttng_event_field_value *field_val, double *val); |
| 167 | |
| 168 | /* |
| 169 | * Returns the raw value (an UTF-8 C string) of the string event field |
| 170 | * value `field_val`, or `NULL` if: |
| 171 | * |
| 172 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_OK`: |
| 173 | * Success. |
| 174 | * |
| 175 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID`: |
| 176 | * * `field_val` is `NULL`. |
| 177 | * * The type of `field_val` is not |
| 178 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_STRING`. |
| 179 | */ |
| 180 | extern enum lttng_event_field_value_status |
| 181 | lttng_event_field_value_string_get_value( |
| 182 | const struct lttng_event_field_value *field_val, |
| 183 | const char **value); |
| 184 | |
| 185 | /* |
| 186 | * Sets `*length` to the length (the number of contained elements) of |
| 187 | * the array event field value `field_val`. |
| 188 | * |
| 189 | * Returns: |
| 190 | * |
| 191 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_OK`: |
| 192 | * Success. |
| 193 | * |
| 194 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID`: |
| 195 | * * `field_val` is `NULL`. |
| 196 | * * The type of `field_val` is not |
| 197 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_ARRAY`. |
| 198 | * * `length` is `NULL`. |
| 199 | */ |
| 200 | extern enum lttng_event_field_value_status |
| 201 | lttng_event_field_value_array_get_length( |
| 202 | const struct lttng_event_field_value *field_val, |
| 203 | unsigned int *length); |
| 204 | |
| 205 | /* |
| 206 | * Sets `*elem_field_val` to the event field value at index `index` in |
| 207 | * the array event field value `field_val`. |
| 208 | * |
| 209 | * Returns: |
| 210 | * |
| 211 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_OK`: |
| 212 | * Success. |
| 213 | * |
| 214 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID`: |
| 215 | * * `field_val` is `NULL`. |
| 216 | * * The type of `field_val` is not |
| 217 | * `LTTNG_EVENT_FIELD_VALUE_TYPE_ARRAY`. |
| 218 | * * `index` is greater than or equal to the length of `field_val`, |
| 219 | * as returned by lttng_event_field_value_array_get_length(). |
| 220 | * |
| 221 | * `LTTNG_EVENT_FIELD_VALUE_STATUS_UNAVAILABLE`: |
| 222 | * * No event field value exists at index `index` within |
| 223 | * `field_val`. |
| 224 | */ |
| 225 | extern enum lttng_event_field_value_status |
| 226 | lttng_event_field_value_array_get_element_at_index( |
| 227 | const struct lttng_event_field_value *field_val, |
| 228 | unsigned int index, |
| 229 | const struct lttng_event_field_value **elem_field_val); |
| 230 | |
| 231 | #ifdef __cplusplus |
| 232 | } |
| 233 | #endif |
| 234 | |
| 235 | #endif /* LTTNG_EVENT_FIELD_VALUE_H */ |