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