1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
10 systemd is free software; you can redistribute it and/or modify it
11 under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
15 systemd is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/param.h>
26 #include <sys/types.h>
30 #define _printf_(a,b) __attribute__ ((format (printf, a, b)))
31 #define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
32 #define _sentinel_ __attribute__ ((sentinel))
33 #define _unused_ __attribute__ ((unused))
34 #define _destructor_ __attribute__ ((destructor))
35 #define _pure_ __attribute__ ((pure))
36 #define _const_ __attribute__ ((const))
37 #define _deprecated_ __attribute__ ((deprecated))
38 #define _packed_ __attribute__ ((packed))
39 #define _malloc_ __attribute__ ((malloc))
40 #define _weak_ __attribute__ ((weak))
41 #define _likely_(x) (__builtin_expect(!!(x),1))
42 #define _unlikely_(x) (__builtin_expect(!!(x),0))
43 #define _public_ __attribute__ ((visibility("default")))
44 #define _hidden_ __attribute__ ((visibility("hidden")))
45 #define _weakref_(x) __attribute__((weakref(#x)))
46 #define _alignas_(x) __attribute__((aligned(__alignof(x))))
47 #define _cleanup_(x) __attribute__((cleanup(x)))
49 /* Temporarily disable some warnings */
50 #define DISABLE_WARNING_DECLARATION_AFTER_STATEMENT \
51 _Pragma("GCC diagnostic push"); \
52 _Pragma("GCC diagnostic ignored \"-Wdeclaration-after-statement\"")
54 #define DISABLE_WARNING_FORMAT_NONLITERAL \
55 _Pragma("GCC diagnostic push"); \
56 _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
58 #define DISABLE_WARNING_MISSING_PROTOTYPES \
59 _Pragma("GCC diagnostic push"); \
60 _Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")
62 #define DISABLE_WARNING_NONNULL \
63 _Pragma("GCC diagnostic push"); \
64 _Pragma("GCC diagnostic ignored \"-Wnonnull\"")
66 #define DISABLE_WARNING_SHADOW \
67 _Pragma("GCC diagnostic push"); \
68 _Pragma("GCC diagnostic ignored \"-Wshadow\"")
70 #define REENABLE_WARNING \
71 _Pragma("GCC diagnostic pop")
73 /* automake test harness */
74 #define EXIT_TEST_SKIP 77
76 #define XSTRINGIFY(x) #x
77 #define STRINGIFY(x) XSTRINGIFY(x)
79 #define XCONCATENATE(x, y) x ## y
80 #define CONCATENATE(x, y) XCONCATENATE(x, y)
82 #define UNIQUE(prefix) CONCATENATE(prefix, __LINE__)
86 #define ALIGN4(l) (((l) + 3) & ~3)
87 #define ALIGN8(l) (((l) + 7) & ~7)
89 #if __SIZEOF_POINTER__ == 8
90 #define ALIGN(l) ALIGN8(l)
91 #elif __SIZEOF_POINTER__ == 4
92 #define ALIGN(l) ALIGN4(l)
94 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
97 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) p))
98 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) p))
99 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) p))
101 static inline size_t ALIGN_TO(size_t l, size_t ali) {
102 return ((l + ali - 1) & ~(ali - 1));
105 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p, ali))
107 /* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
108 static inline unsigned long ALIGN_POWER2(unsigned long u) {
109 /* clz(0) is undefined */
113 /* left-shift overflow is undefined */
114 if (__builtin_clzl(u - 1UL) < 1)
117 return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
120 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
123 * container_of - cast a member of a structure out to the containing structure
124 * @ptr: the pointer to the member.
125 * @type: the type of the container struct this is embedded in.
126 * @member: the name of the member within the struct.
129 #define container_of(ptr, type, member) \
131 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
132 (type *)( (char *)__mptr - offsetof(type,member) ); \
138 typeof(a) _a = (a); \
139 typeof(b) _b = (b); \
143 #define MAX3(x,y,z) \
145 typeof(x) _c = MAX(x,y); \
152 typeof(a) _a = (a); \
153 typeof(b) _b = (b); \
157 #define LESS_BY(A,B) \
159 typeof(A) _A = (A); \
160 typeof(B) _B = (B); \
161 _A > _B ? _A - _B : 0; \
165 #define CLAMP(x, low, high) \
167 typeof(x) _x = (x); \
168 typeof(low) _low = (low); \
169 typeof(high) _high = (high); \
170 ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
174 #define assert_se(expr) \
176 if (_unlikely_(!(expr))) \
177 log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
180 /* We override the glibc assert() here. */
183 #define assert(expr) do {} while(false)
185 #define assert(expr) assert_se(expr)
188 #define assert_not_reached(t) \
190 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
193 #if defined(static_assert)
194 /* static_assert() is sometimes defined in a way that trips up
195 * -Wdeclaration-after-statement, hence let's temporarily turn off
196 * this warning around it. */
197 #define assert_cc(expr) \
198 DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
199 static_assert(expr, #expr); \
202 #define assert_cc(expr) \
203 DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
204 struct UNIQUE(_assert_struct_) { \
205 char x[(expr) ? 0 : -1]; \
210 #define assert_return(expr, r) \
212 if (_unlikely_(!(expr))) { \
213 log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
218 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
219 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
220 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
221 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
223 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
224 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
225 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
226 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
228 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
229 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
230 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
231 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
233 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
234 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
235 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
236 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
238 #define memzero(x,l) (memset((x), 0, (l)))
239 #define zero(x) (memzero(&(x), sizeof(x)))
241 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
243 #define char_array_0(x) x[sizeof(x)-1] = 0;
245 #define IOVEC_SET_STRING(i, s) \
247 struct iovec *_i = &(i); \
248 char *_s = (char *)(s); \
250 _i->iov_len = strlen(_s); \
253 static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
257 for (j = 0; j < n; j++)
263 static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
266 for (j = 0; j < n; j++) {
269 if (_unlikely_(k <= 0))
272 sub = MIN(i[j].iov_len, k);
274 i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
281 #define VA_FORMAT_ADVANCE(format, ap) \
283 int _argtypes[128]; \
285 _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
286 assert(_k < ELEMENTSOF(_argtypes)); \
287 for (_i = 0; _i < _k; _i++) { \
288 if (_argtypes[_i] & PA_FLAG_PTR) { \
289 (void) va_arg(ap, void*); \
293 switch (_argtypes[_i]) { \
295 case PA_INT|PA_FLAG_SHORT: \
297 (void) va_arg(ap, int); \
299 case PA_INT|PA_FLAG_LONG: \
300 (void) va_arg(ap, long int); \
302 case PA_INT|PA_FLAG_LONG_LONG: \
303 (void) va_arg(ap, long long int); \
306 (void) va_arg(ap, wchar_t); \
311 (void) va_arg(ap, void*); \
315 (void) va_arg(ap, double); \
317 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
318 (void) va_arg(ap, long double); \
321 assert_not_reached("Unknown format string argument."); \
326 /* Because statfs.t_type can be int on some architectures, we have to cast
327 * the const magic to the type, otherwise the compiler warns about
328 * signed/unsigned comparison, because the magic can be 32 bit unsigned.
330 #define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
332 /* Returns the number of chars needed to format variables of the
333 * specified type as a decimal string. Adds in extra space for a
334 * negative '-' prefix. */
335 #define DECIMAL_STR_MAX(type) \
336 (2+(sizeof(type) <= 1 ? 3 : \
337 sizeof(type) <= 2 ? 5 : \
338 sizeof(type) <= 4 ? 10 : \
339 sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
341 #define SET_FLAG(v, flag, b) \
342 (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
344 #define IN_SET(x, y, ...) \
346 const typeof(y) _y = (y); \
347 const typeof(_y) _x = (x); \
349 bool _found = false; \
350 for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
351 if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
358 /* Define C11 thread_local attribute even on older gcc compiler
362 * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
363 * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
365 #if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
366 #define thread_local _Thread_local
368 #define thread_local __thread
372 /* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
373 * compiler versions */
375 #if __STDC_VERSION__ >= 201112L
376 #define noreturn _Noreturn
378 #define noreturn __attribute__((noreturn))