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 UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
83 #define UNIQ __COUNTER__
87 #define ALIGN4(l) (((l) + 3) & ~3)
88 #define ALIGN8(l) (((l) + 7) & ~7)
90 #if __SIZEOF_POINTER__ == 8
91 #define ALIGN(l) ALIGN8(l)
92 #elif __SIZEOF_POINTER__ == 4
93 #define ALIGN(l) ALIGN4(l)
95 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
98 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
99 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
100 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
102 static inline size_t ALIGN_TO(size_t l, size_t ali) {
103 return ((l + ali - 1) & ~(ali - 1));
106 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
108 /* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
109 static inline unsigned long ALIGN_POWER2(unsigned long u) {
110 /* clz(0) is undefined */
114 /* left-shift overflow is undefined */
115 if (__builtin_clzl(u - 1UL) < 1)
118 return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
121 #define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
124 * container_of - cast a member of a structure out to the containing structure
125 * @ptr: the pointer to the member.
126 * @type: the type of the container struct this is embedded in.
127 * @member: the name of the member within the struct.
129 #define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
130 #define __container_of(uniq, ptr, type, member) \
132 const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \
133 (type*)( (char *)UNIQ_T(A, uniq) - offsetof(type,member) ); \
137 #define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
138 #define __MAX(aq, a, bq, b) \
140 const typeof(a) UNIQ_T(A, aq) = (a); \
141 const typeof(b) UNIQ_T(B, bq) = (b); \
142 UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
145 /* evaluates to (void) if _A or _B are not constant or of different types */
146 #define CONST_MAX(_A, _B) \
147 __extension__ (__builtin_choose_expr( \
148 __builtin_constant_p(_A) && \
149 __builtin_constant_p(_B) && \
150 __builtin_types_compatible_p(typeof(_A), typeof(_B)), \
151 ((_A) > (_B)) ? (_A) : (_B), \
154 /* takes two types and returns the size of the larger one */
155 #define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
157 #define MAX3(x,y,z) \
159 const typeof(x) _c = MAX(x,y); \
164 #define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
165 #define __MIN(aq, a, bq, b) \
167 const typeof(a) UNIQ_T(A, aq) = (a); \
168 const typeof(b) UNIQ_T(B, bq) = (b); \
169 UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
172 #define MIN3(x,y,z) \
174 const typeof(x) _c = MIN(x,y); \
178 #define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
179 #define __LESS_BY(aq, a, bq, b) \
181 const typeof(a) UNIQ_T(A, aq) = (a); \
182 const typeof(b) UNIQ_T(B, bq) = (b); \
183 UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
187 #define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
188 #define __CLAMP(xq, x, lowq, low, highq, high) \
190 const typeof(x) UNIQ_T(X,xq) = (x); \
191 const typeof(low) UNIQ_T(LOW,lowq) = (low); \
192 const typeof(high) UNIQ_T(HIGH,highq) = (high); \
193 UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ? \
194 UNIQ_T(HIGH,highq) : \
195 UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ? \
200 /* [(x + y - 1) / y] suffers from an integer overflow, even though the
201 * computation should be possible in the given type. Therefore, we use
202 * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
203 * quotient and the remainder, so both should be equally fast. */
204 #define DIV_ROUND_UP(_x, _y) \
206 const typeof(_x) __x = (_x); \
207 const typeof(_y) __y = (_y); \
208 (__x / __y + !!(__x % __y)); \
211 #define assert_se(expr) \
213 if (_unlikely_(!(expr))) \
214 log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
217 /* We override the glibc assert() here. */
220 #define assert(expr) do {} while(false)
222 #define assert(expr) assert_se(expr)
225 #define assert_not_reached(t) \
227 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
230 #if defined(static_assert)
231 /* static_assert() is sometimes defined in a way that trips up
232 * -Wdeclaration-after-statement, hence let's temporarily turn off
233 * this warning around it. */
234 #define assert_cc(expr) \
235 DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
236 static_assert(expr, #expr); \
239 #define assert_cc(expr) \
240 DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
241 struct CONCATENATE(_assert_struct_, __LINE__) { \
242 char x[(expr) ? 0 : -1]; \
247 #define assert_return(expr, r) \
249 if (_unlikely_(!(expr))) { \
250 log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
255 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
256 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
257 #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
258 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
260 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
261 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
262 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
263 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
265 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
266 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
267 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
268 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
270 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
271 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
272 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
273 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
275 #define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
276 #define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
278 /* The following macros add 1 when converting things, since UID 0 is a
279 * valid UID, while the pointer NULL is special */
280 #define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1))
281 #define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
283 #define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1))
284 #define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
286 #define memzero(x,l) (memset((x), 0, (l)))
287 #define zero(x) (memzero(&(x), sizeof(x)))
289 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
291 #define char_array_0(x) x[sizeof(x)-1] = 0;
293 #define IOVEC_SET_STRING(i, s) \
295 struct iovec *_i = &(i); \
296 char *_s = (char *)(s); \
298 _i->iov_len = strlen(_s); \
301 static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
305 for (j = 0; j < n; j++)
311 static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
314 for (j = 0; j < n; j++) {
317 if (_unlikely_(k <= 0))
320 sub = MIN(i[j].iov_len, k);
322 i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
329 #define VA_FORMAT_ADVANCE(format, ap) \
331 int _argtypes[128]; \
333 _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
334 assert(_k < ELEMENTSOF(_argtypes)); \
335 for (_i = 0; _i < _k; _i++) { \
336 if (_argtypes[_i] & PA_FLAG_PTR) { \
337 (void) va_arg(ap, void*); \
341 switch (_argtypes[_i]) { \
343 case PA_INT|PA_FLAG_SHORT: \
345 (void) va_arg(ap, int); \
347 case PA_INT|PA_FLAG_LONG: \
348 (void) va_arg(ap, long int); \
350 case PA_INT|PA_FLAG_LONG_LONG: \
351 (void) va_arg(ap, long long int); \
354 (void) va_arg(ap, wchar_t); \
359 (void) va_arg(ap, void*); \
363 (void) va_arg(ap, double); \
365 case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
366 (void) va_arg(ap, long double); \
369 assert_not_reached("Unknown format string argument."); \
374 /* Because statfs.t_type can be int on some architectures, we have to cast
375 * the const magic to the type, otherwise the compiler warns about
376 * signed/unsigned comparison, because the magic can be 32 bit unsigned.
378 #define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
380 /* Returns the number of chars needed to format variables of the
381 * specified type as a decimal string. Adds in extra space for a
382 * negative '-' prefix. */
383 #define DECIMAL_STR_MAX(type) \
384 (2+(sizeof(type) <= 1 ? 3 : \
385 sizeof(type) <= 2 ? 5 : \
386 sizeof(type) <= 4 ? 10 : \
387 sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
389 #define SET_FLAG(v, flag, b) \
390 (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
392 #define IN_SET(x, y, ...) \
394 const typeof(y) _y = (y); \
395 const typeof(_y) _x = (x); \
397 bool _found = false; \
398 for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \
399 if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \
406 /* Return a nulstr for a standard cascade of configuration directories,
407 * suitable to pass to conf_files_list_nulstr or config_parse_many. */
408 #define CONF_DIRS_NULSTR(n) \
411 "/usr/local/lib/" n ".d\0" \
412 "/usr/lib/" n ".d\0" \
413 CONF_DIR_SPLIT_USR(n)
415 #ifdef HAVE_SPLIT_USR
416 #define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0"
418 #define CONF_DIR_SPLIT_USR(n)
421 /* Define C11 thread_local attribute even on older gcc compiler
425 * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
426 * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
428 #if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
429 #define thread_local _Thread_local
431 #define thread_local __thread
435 /* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
436 * compiler versions */
438 #if __STDC_VERSION__ >= 201112L
439 #define noreturn _Noreturn
441 #define noreturn __attribute__((noreturn))
445 #define UID_INVALID ((uid_t) -1)
446 #define GID_INVALID ((gid_t) -1)
447 #define MODE_INVALID ((mode_t) -1)
449 #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \
450 static inline void func##p(type *p) { \
454 struct __useless_struct_to_allow_trailing_semicolon__