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 DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \
71 _Pragma("GCC diagnostic push"); \
72 _Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
74 #define REENABLE_WARNING \
75 _Pragma("GCC diagnostic pop")
77 /* automake test harness */
78 #define EXIT_TEST_SKIP 77
80 #define XSTRINGIFY(x) #x
81 #define STRINGIFY(x) XSTRINGIFY(x)
83 #define XCONCATENATE(x, y) x ## y
84 #define CONCATENATE(x, y) XCONCATENATE(x, y)
86 #define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
87 #define UNIQ __COUNTER__
91 #define ALIGN4(l) (((l) + 3) & ~3)
92 #define ALIGN8(l) (((l) + 7) & ~7)
94 #if __SIZEOF_POINTER__ == 8
95 #define ALIGN(l) ALIGN8(l)
96 #elif __SIZEOF_POINTER__ == 4
97 #define ALIGN(l) ALIGN4(l)
99 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
102 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
103 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
104 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
106 static inline size_t ALIGN_TO(size_t l, size_t ali) {
107 return ((l + ali - 1) & ~(ali - 1));
110 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
112 /* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
113 static inline unsigned long ALIGN_POWER2(unsigned long u) {
114 /* clz(0) is undefined */
118 /* left-shift overflow is undefined */
119 if (__builtin_clzl(u - 1UL) < 1)
122 return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
125 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
128 * container_of - cast a member of a structure out to the containing structure
129 * @ptr: the pointer to the member.
130 * @type: the type of the container struct this is embedded in.
131 * @member: the name of the member within the struct.
133 #define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
134 #define __container_of(uniq, ptr, type, member) \
136 const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \
137 (type*)( (char *)UNIQ_T(A, uniq) - offsetof(type,member) ); \
141 #define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
142 #define __MAX(aq, a, bq, b) \
144 const typeof(a) UNIQ_T(A, aq) = (a); \
145 const typeof(b) UNIQ_T(B, bq) = (b); \
146 UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
149 /* evaluates to (void) if _A or _B are not constant or of different types */
150 #define CONST_MAX(_A, _B) \
151 __extension__ (__builtin_choose_expr( \
152 __builtin_constant_p(_A) && \
153 __builtin_constant_p(_B) && \
154 __builtin_types_compatible_p(typeof(_A), typeof(_B)), \
155 ((_A) > (_B)) ? (_A) : (_B), \
158 /* takes two types and returns the size of the larger one */
159 #define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
161 #define MAX3(x,y,z) \
163 const typeof(x) _c = MAX(x,y); \
168 #define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
169 #define __MIN(aq, a, bq, b) \
171 const typeof(a) UNIQ_T(A, aq) = (a); \
172 const typeof(b) UNIQ_T(B, bq) = (b); \
173 UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
176 #define MIN3(x,y,z) \
178 const typeof(x) _c = MIN(x,y); \
182 #define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
183 #define __LESS_BY(aq, a, bq, b) \
185 const typeof(a) UNIQ_T(A, aq) = (a); \
186 const typeof(b) UNIQ_T(B, bq) = (b); \
187 UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
191 #define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
192 #define __CLAMP(xq, x, lowq, low, highq, high) \
194 const typeof(x) UNIQ_T(X,xq) = (x); \
195 const typeof(low) UNIQ_T(LOW,lowq) = (low); \
196 const typeof(high) UNIQ_T(HIGH,highq) = (high); \
197 UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ? \
198 UNIQ_T(HIGH,highq) : \
199 UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ? \
204 /* [(x + y - 1) / y] suffers from an integer overflow, even though the
205 * computation should be possible in the given type. Therefore, we use
206 * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
207 * quotient and the remainder, so both should be equally fast. */
208 #define DIV_ROUND_UP(_x, _y) \
210 const typeof(_x) __x = (_x); \
211 const typeof(_y) __y = (_y); \
212 (__x / __y + !!(__x % __y)); \
215 #define assert_se(expr) \
217 if (_unlikely_(!(expr))) \
218 log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
221 /* We override the glibc assert() here. */
224 #define assert(expr) do {} while(false)
226 #define assert(expr) assert_se(expr)
229 #define assert_not_reached(t) \
231 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
234 #if defined(static_assert)
235 /* static_assert() is sometimes defined in a way that trips up
236 * -Wdeclaration-after-statement, hence let's temporarily turn off
237 * this warning around it. */
238 #define assert_cc(expr) \
239 DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
240 static_assert(expr, #expr); \
243 #define assert_cc(expr) \
244 DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
245 struct CONCATENATE(_assert_struct_, __COUNTER__) { \
246 char x[(expr) ? 0 : -1]; \
251 #define assert_log(expr) ((_likely_(expr)) \
253 : (log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))
255 #define assert_return(expr, r) \
257 if (!assert_log(expr)) \
261 #define assert_return_errno(expr, r, err) \
263 if (!assert_log(expr)) { \
269 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
270 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
271 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
272 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
274 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
275 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
276 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
277 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
279 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
280 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
281 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
282 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
284 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
285 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
286 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
287 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
289 #define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
290 #define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
292 /* The following macros add 1 when converting things, since UID 0 is a
293 * valid UID, while the pointer NULL is special */
294 #define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1))
295 #define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
297 #define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1))
298 #define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
300 #define memzero(x,l) (memset((x), 0, (l)))
301 #define zero(x) (memzero(&(x), sizeof(x)))
303 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
305 #define char_array_0(x) x[sizeof(x)-1] = 0;
307 #define IOVEC_SET_STRING(i, s) \
309 struct iovec *_i = &(i); \
310 char *_s = (char *)(s); \
312 _i->iov_len = strlen(_s); \
315 static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
319 for (j = 0; j < n; j++)
325 static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
328 for (j = 0; j < n; j++) {
331 if (_unlikely_(k <= 0))
334 sub = MIN(i[j].iov_len, k);
336 i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
343 #define VA_FORMAT_ADVANCE(format, ap) \
345 int _argtypes[128]; \
347 _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
348 assert(_k < ELEMENTSOF(_argtypes)); \
349 for (_i = 0; _i < _k; _i++) { \
350 if (_argtypes[_i] & PA_FLAG_PTR) { \
351 (void) va_arg(ap, void*); \
355 switch (_argtypes[_i]) { \
357 case PA_INT|PA_FLAG_SHORT: \
359 (void) va_arg(ap, int); \
361 case PA_INT|PA_FLAG_LONG: \
362 (void) va_arg(ap, long int); \
364 case PA_INT|PA_FLAG_LONG_LONG: \
365 (void) va_arg(ap, long long int); \
368 (void) va_arg(ap, wchar_t); \
373 (void) va_arg(ap, void*); \
377 (void) va_arg(ap, double); \
379 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
380 (void) va_arg(ap, long double); \
383 assert_not_reached("Unknown format string argument."); \
388 /* Because statfs.t_type can be int on some architectures, we have to cast
389 * the const magic to the type, otherwise the compiler warns about
390 * signed/unsigned comparison, because the magic can be 32 bit unsigned.
392 #define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
394 /* Returns the number of chars needed to format variables of the
395 * specified type as a decimal string. Adds in extra space for a
396 * negative '-' prefix (hence works correctly on signed
397 * types). Includes space for the trailing NUL. */
398 #define DECIMAL_STR_MAX(type) \
399 (2+(sizeof(type) <= 1 ? 3 : \
400 sizeof(type) <= 2 ? 5 : \
401 sizeof(type) <= 4 ? 10 : \
402 sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
404 #define SET_FLAG(v, flag, b) \
405 (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
407 #define IN_SET(x, y, ...) \
409 const typeof(y) _y = (y); \
410 const typeof(_y) _x = (x); \
412 bool _found = false; \
413 for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
414 if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
421 /* Return a nulstr for a standard cascade of configuration directories,
422 * suitable to pass to conf_files_list_nulstr or config_parse_many. */
423 #define CONF_DIRS_NULSTR(n) \
426 "/usr/local/lib/" n ".d\0" \
427 "/usr/lib/" n ".d\0" \
428 CONF_DIR_SPLIT_USR(n)
430 #ifdef HAVE_SPLIT_USR
431 #define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0"
433 #define CONF_DIR_SPLIT_USR(n)
436 /* Define C11 thread_local attribute even on older gcc compiler
440 * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
441 * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
443 #if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
444 #define thread_local _Thread_local
446 #define thread_local __thread
450 /* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
451 * compiler versions */
453 #if __STDC_VERSION__ >= 201112L
454 #define noreturn _Noreturn
456 #define noreturn __attribute__((noreturn))
460 #define UID_INVALID ((uid_t) -1)
461 #define GID_INVALID ((gid_t) -1)
462 #define MODE_INVALID ((mode_t) -1)
464 #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \
465 static inline void func##p(type *p) { \
469 struct __useless_struct_to_allow_trailing_semicolon__
471 #define CMSG_FOREACH(cmsg, mh) \
472 for ((cmsg) = CMSG_FIRSTHDR(mh); (cmsg); (cmsg) = CMSG_NXTHDR((mh), (cmsg)))