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 const typeof(a) _a = (a); \
139 const typeof(b) _b = (b); \
143 /* evaluates to (void) if _A or _B are not constant or of different types */
144 #define CONST_MAX(_A, _B) \
145 __extension__ (__builtin_choose_expr( \
146 __builtin_constant_p(_A) && \
147 __builtin_constant_p(_B) && \
148 __builtin_types_compatible_p(typeof(_A), typeof(_B)), \
149 ((_A) > (_B)) ? (_A) : (_B), \
152 #define MAX3(x,y,z) \
154 const typeof(x) _c = MAX(x,y); \
161 const typeof(a) _a = (a); \
162 const typeof(b) _b = (b); \
166 #define MIN3(x,y,z) \
168 const typeof(x) _c = MIN(x,y); \
172 #define LESS_BY(A,B) \
174 const typeof(A) _A = (A); \
175 const typeof(B) _B = (B); \
176 _A > _B ? _A - _B : 0; \
180 #define CLAMP(x, low, high) \
182 const typeof(x) _x = (x); \
183 const typeof(low) _low = (low); \
184 const typeof(high) _high = (high); \
185 ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \
189 #define assert_se(expr) \
191 if (_unlikely_(!(expr))) \
192 log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
195 /* We override the glibc assert() here. */
198 #define assert(expr) do {} while(false)
200 #define assert(expr) assert_se(expr)
203 #define assert_not_reached(t) \
205 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
208 #if defined(static_assert)
209 /* static_assert() is sometimes defined in a way that trips up
210 * -Wdeclaration-after-statement, hence let's temporarily turn off
211 * this warning around it. */
212 #define assert_cc(expr) \
213 DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
214 static_assert(expr, #expr); \
217 #define assert_cc(expr) \
218 DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
219 struct UNIQUE(_assert_struct_) { \
220 char x[(expr) ? 0 : -1]; \
225 #define assert_return(expr, r) \
227 if (_unlikely_(!(expr))) { \
228 log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
233 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
234 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
235 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
236 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
238 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
239 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
240 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
241 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
243 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
244 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
245 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
246 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
248 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
249 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
250 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
251 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
253 #define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
254 #define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
256 #define memzero(x,l) (memset((x), 0, (l)))
257 #define zero(x) (memzero(&(x), sizeof(x)))
259 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
261 #define char_array_0(x) x[sizeof(x)-1] = 0;
263 #define IOVEC_SET_STRING(i, s) \
265 struct iovec *_i = &(i); \
266 char *_s = (char *)(s); \
268 _i->iov_len = strlen(_s); \
271 static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
275 for (j = 0; j < n; j++)
281 static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
284 for (j = 0; j < n; j++) {
287 if (_unlikely_(k <= 0))
290 sub = MIN(i[j].iov_len, k);
292 i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
299 #define VA_FORMAT_ADVANCE(format, ap) \
301 int _argtypes[128]; \
303 _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
304 assert(_k < ELEMENTSOF(_argtypes)); \
305 for (_i = 0; _i < _k; _i++) { \
306 if (_argtypes[_i] & PA_FLAG_PTR) { \
307 (void) va_arg(ap, void*); \
311 switch (_argtypes[_i]) { \
313 case PA_INT|PA_FLAG_SHORT: \
315 (void) va_arg(ap, int); \
317 case PA_INT|PA_FLAG_LONG: \
318 (void) va_arg(ap, long int); \
320 case PA_INT|PA_FLAG_LONG_LONG: \
321 (void) va_arg(ap, long long int); \
324 (void) va_arg(ap, wchar_t); \
329 (void) va_arg(ap, void*); \
333 (void) va_arg(ap, double); \
335 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
336 (void) va_arg(ap, long double); \
339 assert_not_reached("Unknown format string argument."); \
344 /* Because statfs.t_type can be int on some architectures, we have to cast
345 * the const magic to the type, otherwise the compiler warns about
346 * signed/unsigned comparison, because the magic can be 32 bit unsigned.
348 #define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
350 /* Returns the number of chars needed to format variables of the
351 * specified type as a decimal string. Adds in extra space for a
352 * negative '-' prefix. */
353 #define DECIMAL_STR_MAX(type) \
354 (2+(sizeof(type) <= 1 ? 3 : \
355 sizeof(type) <= 2 ? 5 : \
356 sizeof(type) <= 4 ? 10 : \
357 sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
359 #define SET_FLAG(v, flag, b) \
360 (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
362 #define IN_SET(x, y, ...) \
364 const typeof(y) _y = (y); \
365 const typeof(_y) _x = (x); \
367 bool _found = false; \
368 for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
369 if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
376 /* Define C11 thread_local attribute even on older gcc compiler
380 * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
381 * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
383 #if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
384 #define thread_local _Thread_local
386 #define thread_local __thread
390 /* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
391 * compiler versions */
393 #if __STDC_VERSION__ >= 201112L
394 #define noreturn _Noreturn
396 #define noreturn __attribute__((noreturn))