2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * SPDX-License-Identifier: GPL-2.0-only
15 #include <common/compat/string.h>
18 * Takes a pointer x and transform it so we can use it to access members
19 * without a function call. Here an example:
21 * #define GET_SIZE(x) LTTNG_REF(x)->size
23 * struct { int size; } s;
25 * printf("size : %d\n", GET_SIZE(&s));
27 * For this example we can't use something like this for compatibility purpose
28 * since this will fail:
30 * #define GET_SIZE(x) x->size;
32 * This is mostly use for the compatibility layer of lttng-tools. See
33 * poll/epoll for a good example. Since x can be on the stack or allocated
34 * memory using malloc(), we must use generic accessors for compat in order to
35 * *not* use a function to access members and not the variable name.
37 #define LTTNG_REF(x) ((typeof(*x) *)(x))
40 * Memory allocation zeroed
43 void *zmalloc(size_t len
)
45 return calloc(1, len
);
49 #define ARRAY_SIZE(array) (sizeof(array) / (sizeof((array)[0])))
53 #define container_of(ptr, type, member) \
55 const typeof(((type *)NULL)->member) * __ptr = (ptr); \
56 (type *)((char *)__ptr - offsetof(type, member)); \
61 #define LTTNG_PACKED __attribute__((__packed__))
64 #ifndef LTTNG_NO_SANITIZE_ADDRESS
65 #if defined(__clang__) || defined (__GNUC__)
66 #define LTTNG_NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
68 #define LTTNG_NO_SANITIZE_ADDRESS
72 #define is_signed(type) (((type) -1) < (type) 1)
74 #define member_sizeof(type, field) sizeof(((type *) 0)->field)
76 #define ASSERT_LOCKED(lock) LTTNG_ASSERT(pthread_mutex_trylock(&lock))
78 /* Attribute suitable to tag functions as having printf()-like arguments. */
79 #define ATTR_FORMAT_PRINTF(_string_index, _first_to_check) \
80 __attribute__((format(printf, _string_index, _first_to_check)))
82 /* Attribute suitable to tag functions as having strftime()-like arguments. */
83 #define ATTR_FORMAT_STRFTIME(_string_index) \
84 __attribute__((format(strftime, _string_index, 0)))
86 /* Macros used to ignore specific compiler diagnostics. */
88 #define DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push")
89 #define DIAGNOSTIC_POP _Pragma("GCC diagnostic pop")
91 #if defined(__clang__)
93 # define DIAGNOSTIC_IGNORE_SUGGEST_ATTRIBUTE_FORMAT
94 # define DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL \
95 _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
98 # define DIAGNOSTIC_IGNORE_SUGGEST_ATTRIBUTE_FORMAT \
99 _Pragma("GCC diagnostic ignored \"-Wsuggest-attribute=format\"")
100 # define DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL \
101 _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
104 /* Used to make specific C++ functions to C code. */
106 #define C_LINKAGE extern "C"
112 * lttng_strncpy returns 0 on success, or nonzero on failure.
113 * It checks that the @src string fits into @dst_len before performing
114 * the copy. On failure, no copy has been performed.
116 * dst_len includes the string's trailing NULL.
119 int lttng_strncpy(char *dst
, const char *src
, size_t dst_len
)
121 if (lttng_strnlen(src
, dst_len
) >= dst_len
) {
122 /* Fail since copying would result in truncation. */
131 * Force usage of the assertion condition to prevent unused variable warnings
132 * when `assert()` are disabled by the `NDEBUG` definition.
134 # define LTTNG_ASSERT(_cond) ((void) sizeof((void) (_cond), 0))
137 # define LTTNG_ASSERT(_cond) assert(_cond)
140 #endif /* _MACROS_H */
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