Commit | Line | Data |
---|---|---|
6242251b | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2012 Christian Babeux <christian.babeux@efficios.com> |
6242251b | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
6242251b | 5 | * |
6242251b CB |
6 | */ |
7 | ||
8 | #ifndef NTESTPOINT | |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
6242251b CB |
11 | #include <dlfcn.h> /* for dlsym */ |
12 | #include <stdlib.h> /* for getenv */ | |
13 | #include <string.h> /* for strncmp */ | |
14 | ||
15 | #include "testpoint.h" | |
16 | ||
17 | /* Environment variable used to enable the testpoints facilities. */ | |
18 | static const char *lttng_testpoint_env_var = "LTTNG_TESTPOINT_ENABLE"; | |
19 | ||
20 | /* Testpoint toggle flag */ | |
21 | int lttng_testpoint_activated; | |
22 | ||
23 | /* | |
24 | * Toggle the support for testpoints on the application startup. | |
25 | */ | |
26 | static void __attribute__((constructor)) lttng_testpoint_check(void) | |
27 | { | |
28 | char *testpoint_env_val = NULL; | |
29 | ||
30 | testpoint_env_val = getenv(lttng_testpoint_env_var); | |
31 | if (testpoint_env_val != NULL | |
32 | && (strncmp(testpoint_env_val, "1", 1) == 0)) { | |
33 | lttng_testpoint_activated = 1; | |
34 | } | |
35 | } | |
36 | ||
37 | /* | |
38 | * Lookup a symbol by name. | |
39 | * | |
40 | * Return the address where the symbol is loaded or NULL if the symbol was not | |
41 | * found. | |
42 | */ | |
43 | void *lttng_testpoint_lookup(const char *name) | |
44 | { | |
45 | if (!name) { | |
46 | return NULL; | |
47 | } | |
48 | ||
49 | return dlsym(RTLD_DEFAULT, name); | |
50 | } | |
51 | ||
52 | #endif /* NTESTPOINT */ |