Fix: add missing getenv wrapper
[lttng-ust.git] / liblttng-ust / lttng-getcpu.c
1 /*
2 * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; version 2.1 of
7 * the License.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #define _GNU_SOURCE
20 #include <error.h>
21 #include <dlfcn.h>
22 #include <stdlib.h>
23 #include <usterr-signal-safe.h>
24 #include <lttng/ust-getcpu.h>
25 #include <urcu/system.h>
26 #include <urcu/arch.h>
27
28 #include "getenv.h"
29 #include "../libringbuffer/getcpu.h"
30
31 int (*lttng_get_cpu)(void);
32
33 int lttng_ust_getcpu_override(int (*getcpu)(void))
34 {
35 CMM_STORE_SHARED(lttng_get_cpu, getcpu);
36 return 0;
37 }
38
39 void lttng_ust_getcpu_init(void)
40 {
41 const char *libname;
42 void *handle;
43 void (*libinit)(void);
44
45 libname = lttng_secure_getenv("LTTNG_UST_GETCPU_PLUGIN");
46 if (!libname)
47 return;
48 handle = dlopen(libname, RTLD_NOW);
49 if (!handle) {
50 PERROR("Cannot load LTTng UST getcpu override library %s",
51 libname);
52 return;
53 }
54 dlerror();
55 libinit = (void (*)(void)) dlsym(handle,
56 "lttng_ust_getcpu_plugin_init");
57 if (!libinit) {
58 PERROR("Cannot find LTTng UST getcpu override library %s initialization function lttng_ust_getcpu_plugin_init()",
59 libname);
60 return;
61 }
62 libinit();
63 }
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