Move all sources to 'src/'
[lttng-ust.git] / src / liblttng-ust / compat.h
1 /*
2 * SPDX-License-Identifier: LGPL-2.1-only
3 *
4 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * Copyright (C) 2016 Raphaƫl Beamonte <raphael.beamonte@gmail.com>
6 * Copyright (C) 2020 Michael Jeanson <mjeanson@efficios.com>
7 */
8
9 #ifndef _UST_COMPAT_H
10 #define _UST_COMPAT_H
11
12 #include <pthread.h>
13 #include <errno.h>
14 #include <string.h>
15
16 #ifdef __FreeBSD__
17 #include <pthread_np.h>
18 #endif
19
20 #include <lttng/ust-abi.h>
21
22 #define LTTNG_UST_PROCNAME_SUFFIX "-ust"
23
24
25 #if defined(HAVE_PTHREAD_SETNAME_NP_WITH_TID)
26 static inline
27 int lttng_pthread_setname_np(const char *name)
28 {
29 /*
30 * Some implementations don't error out, replicate this behavior for
31 * consistency.
32 */
33 if (strnlen(name, LTTNG_UST_ABI_PROCNAME_LEN) >= LTTNG_UST_ABI_PROCNAME_LEN) {
34 return ERANGE;
35 }
36
37 return pthread_setname_np(pthread_self(), name);
38 }
39 #elif defined(HAVE_PTHREAD_SETNAME_NP_WITHOUT_TID)
40 static inline
41 int lttng_pthread_setname_np(const char *name)
42 {
43 return pthread_setname_np(name);
44 }
45 #elif defined(HAVE_PTHREAD_SET_NAME_NP_WITH_TID)
46
47 static inline
48 int lttng_pthread_setname_np(const char *name)
49 {
50 /* Replicate pthread_setname_np's behavior */
51 if (strnlen(name, LTTNG_UST_ABI_PROCNAME_LEN) >= LTTNG_UST_ABI_PROCNAME_LEN) {
52 return ERANGE;
53 }
54
55 pthread_set_name_np(pthread_self(), name);
56 return 0;
57 }
58 #elif defined(__linux__)
59
60 /* Fallback on prtctl on Linux */
61 #include <sys/prctl.h>
62
63 static inline
64 int lttng_pthread_setname_np(const char *name)
65 {
66 /* Replicate pthread_setname_np's behavior */
67 if (strnlen(name, LTTNG_UST_ABI_PROCNAME_LEN) >= LTTNG_UST_ABI_PROCNAME_LEN) {
68 return ERANGE;
69 }
70 return prctl(PR_SET_NAME, name, 0, 0, 0);
71 }
72 #else
73 #error "Please add pthread set name support for your OS."
74 #endif
75
76
77 #if defined(HAVE_PTHREAD_GETNAME_NP_WITH_TID)
78 static inline
79 int lttng_pthread_getname_np(char *name, size_t len)
80 {
81 return pthread_getname_np(pthread_self(), name, len);
82 }
83 #elif defined(HAVE_PTHREAD_GETNAME_NP_WITHOUT_TID)
84 static inline
85 int lttng_pthread_getname_np(char *name, size_t len)
86 {
87 return pthread_getname_np(name, len);
88 }
89 #elif defined(HAVE_PTHREAD_GET_NAME_NP_WITH_TID)
90
91 static inline
92 int lttng_pthread_getname_np(char *name, size_t len)
93 {
94 pthread_get_name_np(pthread_self(), name, len);
95 return 0;
96 }
97 #elif defined(__linux__)
98
99 /* Fallback on prtctl on Linux */
100 #include <sys/prctl.h>
101
102 static inline
103 int lttng_pthread_getname_np(char *name, size_t len)
104 {
105 return prctl(PR_GET_NAME, name, 0, 0, 0);
106 }
107
108 #else
109 #error "Please add pthread get name support for your OS."
110 #endif
111
112 /*
113 * If a pthread setname/set_name function is available, declare
114 * the setustprocname() function that will add '-ust' to the end
115 * of the current process name, while truncating it if needed.
116 */
117 static inline
118 int lttng_ust_setustprocname(void)
119 {
120 int ret = 0, len;
121 char name[LTTNG_UST_ABI_PROCNAME_LEN];
122 int limit = LTTNG_UST_ABI_PROCNAME_LEN - strlen(LTTNG_UST_PROCNAME_SUFFIX) - 1;
123
124 /*
125 * Get the current thread name.
126 */
127 ret = lttng_pthread_getname_np(name, LTTNG_UST_ABI_PROCNAME_LEN);
128 if (ret) {
129 goto error;
130 }
131
132 len = strlen(name);
133 if (len > limit) {
134 len = limit;
135 }
136
137 ret = sprintf(name + len, LTTNG_UST_PROCNAME_SUFFIX);
138 if (ret != strlen(LTTNG_UST_PROCNAME_SUFFIX)) {
139 goto error;
140 }
141
142 ret = lttng_pthread_setname_np(name);
143
144 error:
145 return ret;
146 }
147
148 #include <errno.h>
149
150 #ifndef ENODATA
151 #define ENODATA ENOMSG
152 #endif
153
154 #endif /* _UST_COMPAT_H */
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