2 * SPDX-License-Identifier: LGPL-2.1-only
4 * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 #include "common/logging.h"
11 #include <urcu/system.h>
12 #include <urcu/arch.h>
14 #include "common/getenv.h"
15 #include "lib/lttng-ust/getcpu.h"
17 /* Function pointer to the current getcpu callback. */
18 int (*lttng_ust_get_cpu_sym
)(void);
21 void *getcpu_plugin_handle
;
24 * Override the user provided getcpu implementation.
26 int lttng_ust_getcpu_override(int (*getcpu
)(void))
28 CMM_STORE_SHARED(lttng_ust_get_cpu_sym
, getcpu
);
33 * Initialize the getcpu plugin if it's present.
35 void lttng_ust_getcpu_plugin_init(void)
38 void (*getcpu_plugin_init
)(void);
40 /* If a plugin is already loaded, do nothing. */
41 if (getcpu_plugin_handle
)
45 * If the LTTNG_UST_GETCPU_PLUGIN environment variable is undefined, do
48 libname
= lttng_ust_getenv("LTTNG_UST_GETCPU_PLUGIN");
53 * Thy to dlopen the getcpu plugin shared object specified in
54 * LTTNG_UST_GETCPU_PLUGIN.
56 getcpu_plugin_handle
= dlopen(libname
, RTLD_NOW
);
57 if (!getcpu_plugin_handle
) {
58 PERROR("Cannot load LTTng UST getcpu override library %s",
64 /* Locate the getcpu plugin init function in the shared object. */
65 getcpu_plugin_init
= (void (*)(void)) dlsym(getcpu_plugin_handle
,
66 "lttng_ust_getcpu_plugin_init");
67 if (!getcpu_plugin_init
) {
68 PERROR("Cannot find LTTng UST getcpu override library %s initialization function lttng_ust_getcpu_plugin_init()",
73 /* Run the user provided getcpu plugin init function. */
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