projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| 568d7e2d JR |
1 | /* |
| 2 | * lttng-ust-getcpu-override-test.c | |
| 3 | * Based on lttng-getcpu-override-example.c from LTTng-ust exemple | |
| 4 | * | |
| 9d16b343 MJ |
5 | * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 6 | * Copyright (C) 2015 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> | |
| 568d7e2d | 7 | * |
| 9d16b343 | 8 | * SPDX-License-Identifier: MIT |
| 568d7e2d | 9 | * |
| 568d7e2d JR |
10 | */ |
| 11 | ||
| 12 | #include <stdlib.h> | |
| 389fbf04 | 13 | #include <common/compat/time.h> |
| 568d7e2d JR |
14 | #include <string.h> |
| 15 | #include <stdio.h> | |
| 16 | #include <unistd.h> | |
| 17 | #include <lttng/ust-getcpu.h> | |
| 18 | ||
| de76faf8 JG |
19 | static long nprocessors; |
| 20 | ||
| 568d7e2d JR |
21 | int plugin_getcpu(void) |
| 22 | { | |
| 23 | /* Generate a sequence based on the number of configurated processor | |
| 24 | * by using sequence[i] % nb_configured_processors. Where sequence | |
| 25 | * is a static random sequence. | |
| 26 | * The expected cpu_id sequence can be regenerated on the test script | |
| 27 | * side and compared to the extracted cpu sequence for validation. | |
| 28 | * This does no guarantee in absolute the validity of the getcpu | |
| 29 | * plugin but provide a strong argument of it's validity. | |
| 30 | */ | |
| 31 | static int i = 0; | |
| 885fe378 JG |
32 | static int seq_seed[256] = { 100, 57, 232, 236, 42, 193, 224, 184, 216, |
| 33 | 150, 92, 91, 108, 118, 55, 243, 65, 101, 209, 0, 147, 36, 29, | |
| 34 | 34, 49, 188, 174, 105, 253, 245, 227, 238, 112, 20, 222, 201, | |
| 35 | 102, 175, 119, 19, 132, 41, 78, 90, 114, 64, 138, 14, 48, 18, | |
| 36 | 162, 85, 204, 124, 133, 73, 172, 106, 241, 126, 28, 104, 111, | |
| 37 | 21, 127, 219, 9, 244, 237, 189, 59, 214, 52, 141, 107, 26, 25, | |
| 38 | 199, 3, 157, 117, 234, 33, 44, 46, 84, 69, 155, 122, 250, 231, | |
| 39 | 86, 239, 76, 190, 120, 1, 94, 206, 8, 148, 159, 167, 215, 164, | |
| 40 | 31, 217, 61, 71, 125, 68, 109, 195, 177, 95, 82, 142, 182, 129, | |
| 41 | 87, 37, 140, 134, 186, 173, 39, 116, 143, 254, 229, 131, 67, | |
| 42 | 121, 192, 240, 15, 221, 30, 242, 185, 80, 170, 135, 51, 187, | |
| 43 | 194, 246, 12, 225, 181, 137, 211, 228, 88, 218, 27, 233, 161, | |
| 44 | 77, 252, 123, 93, 220, 248, 205, 223, 144, 128, 196, 70, 247, | |
| 45 | 210, 178, 203, 154, 24, 169, 149, 163, 35, 7, 151, 103, 197, | |
| 46 | 139, 165, 158, 207, 72, 113, 145, 45, 183, 11, 198, 43, 81, 230, | |
| 47 | 97, 96, 2, 66, 213, 146, 179, 22, 58, 54, 38, 160, 200, 235, | |
| 48 | 226, 156, 56, 208, 249, 32, 176, 168, 110, 191, 79, 152, 115, | |
| 49 | 10, 74, 60, 251, 17, 83, 180, 171, 202, 40, 166, 255, 53, 212, | |
| 50 | 98, 5, 50, 99, 4, 89, 13, 63, 6, 136, 153, 23, 16, 47, 130, 75, | |
| 51 | 62 }; | |
| 568d7e2d | 52 | int ret; |
| de76faf8 JG |
53 | |
| 54 | ret = seq_seed[i] % nprocessors; | |
| 568d7e2d JR |
55 | i++; |
| 56 | i = i % 256; | |
| 57 | return ret; | |
| 58 | } | |
| 59 | ||
| 60 | void lttng_ust_getcpu_plugin_init(void) | |
| 61 | { | |
| 62 | int ret; | |
| 63 | ||
| de76faf8 JG |
64 | nprocessors = sysconf(_SC_NPROCESSORS_CONF); |
| 65 | if (nprocessors < 0) { | |
| 66 | perror("Failed to get _SC_NPROCESSORS_CONF"); | |
| 67 | goto error; | |
| 68 | } | |
| 69 | ||
| 568d7e2d JR |
70 | ret = lttng_ust_getcpu_override(plugin_getcpu); |
| 71 | if (ret) { | |
| 72 | fprintf(stderr, "Error enabling getcpu override: %s\n", | |
| 73 | strerror(-ret)); | |
| 74 | goto error; | |
| 75 | } | |
| 76 | return; | |
| 77 | ||
| 78 | error: | |
| 79 | exit(EXIT_FAILURE); | |
| 80 | } |