#pragma once /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <assert.h> #include <inttypes.h> #include <stdbool.h> #include <sys/param.h> #include <sys/sysmacros.h> #include <sys/types.h> #define _printf_(a,b) __attribute__ ((format (printf, a, b))) #ifdef __clang__ # define _alloc_(...) #else # define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__))) #endif #define _sentinel_ __attribute__ ((sentinel)) #define _unused_ __attribute__ ((unused)) #define _destructor_ __attribute__ ((destructor)) #define _pure_ __attribute__ ((pure)) #define _const_ __attribute__ ((const)) #define _deprecated_ __attribute__ ((deprecated)) #define _packed_ __attribute__ ((packed)) #define _malloc_ __attribute__ ((malloc)) #define _weak_ __attribute__ ((weak)) #define _likely_(x) (__builtin_expect(!!(x),1)) #define _unlikely_(x) (__builtin_expect(!!(x),0)) #define _public_ __attribute__ ((visibility("default"))) #define _hidden_ __attribute__ ((visibility("hidden"))) #define _weakref_(x) __attribute__((weakref(#x))) #define _alignas_(x) __attribute__((aligned(__alignof(x)))) #define _cleanup_(x) __attribute__((cleanup(x))) /* Temporarily disable some warnings */ #define DISABLE_WARNING_DECLARATION_AFTER_STATEMENT \ _Pragma("GCC diagnostic push"); \ _Pragma("GCC diagnostic ignored \"-Wdeclaration-after-statement\"") #define DISABLE_WARNING_FORMAT_NONLITERAL \ _Pragma("GCC diagnostic push"); \ _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"") #define DISABLE_WARNING_MISSING_PROTOTYPES \ _Pragma("GCC diagnostic push"); \ _Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"") #define DISABLE_WARNING_NONNULL \ _Pragma("GCC diagnostic push"); \ _Pragma("GCC diagnostic ignored \"-Wnonnull\"") #define DISABLE_WARNING_SHADOW \ _Pragma("GCC diagnostic push"); \ _Pragma("GCC diagnostic ignored \"-Wshadow\"") #define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \ _Pragma("GCC diagnostic push"); \ _Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"") #define REENABLE_WARNING \ _Pragma("GCC diagnostic pop") /* automake test harness */ #define EXIT_TEST_SKIP 77 #define XSTRINGIFY(x) #x #define STRINGIFY(x) XSTRINGIFY(x) #define XCONCATENATE(x, y) x ## y #define CONCATENATE(x, y) XCONCATENATE(x, y) #define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq)) #define UNIQ __COUNTER__ /* builtins */ #if __SIZEOF_INT__ == 4 #define BUILTIN_FFS_U32(x) __builtin_ffs(x); #elif __SIZEOF_LONG__ == 4 #define BUILTIN_FFS_U32(x) __builtin_ffsl(x); #else #error "neither int nor long are four bytes long?!?" #endif /* Rounds up */ #define ALIGN4(l) (((l) + 3) & ~3) #define ALIGN8(l) (((l) + 7) & ~7) #if __SIZEOF_POINTER__ == 8 #define ALIGN(l) ALIGN8(l) #elif __SIZEOF_POINTER__ == 4 #define ALIGN(l) ALIGN4(l) #else #error "Wut? Pointers are neither 4 nor 8 bytes long?" #endif #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p))) #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p))) #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p))) static inline size_t ALIGN_TO(size_t l, size_t ali) { return ((l + ali - 1) & ~(ali - 1)); } #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali))) /* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */ static inline unsigned long ALIGN_POWER2(unsigned long u) { /* clz(0) is undefined */ if (u == 1) return 1; /* left-shift overflow is undefined */ if (__builtin_clzl(u - 1UL) < 1) return 0; return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL)); } #define ELEMENTSOF(x) \ __extension__ (__builtin_choose_expr( \ !__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \ sizeof(x)/sizeof((x)[0]), \ (void)0)) /* * container_of - cast a member of a structure out to the containing structure * @ptr: the pointer to the member. * @type: the type of the container struct this is embedded in. * @member: the name of the member within the struct. */ #define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member) #define __container_of(uniq, ptr, type, member) \ __extension__ ({ \ const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \ (type*)( (char *)UNIQ_T(A, uniq) - offsetof(type,member) ); \ }) #undef MAX #define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b)) #define __MAX(aq, a, bq, b) \ __extension__ ({ \ const typeof(a) UNIQ_T(A, aq) = (a); \ const typeof(b) UNIQ_T(B, bq) = (b); \ UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \ }) /* evaluates to (void) if _A or _B are not constant or of different types */ #define CONST_MAX(_A, _B) \ __extension__ (__builtin_choose_expr( \ __builtin_constant_p(_A) && \ __builtin_constant_p(_B) && \ __builtin_types_compatible_p(typeof(_A), typeof(_B)), \ ((_A) > (_B)) ? (_A) : (_B), \ (void)0)) /* takes two types and returns the size of the larger one */ #define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; })) #define MAX3(x,y,z) \ __extension__ ({ \ const typeof(x) _c = MAX(x,y); \ MAX(_c, z); \ }) #undef MIN #define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b)) #define __MIN(aq, a, bq, b) \ __extension__ ({ \ const typeof(a) UNIQ_T(A, aq) = (a); \ const typeof(b) UNIQ_T(B, bq) = (b); \ UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \ }) #define MIN3(x,y,z) \ __extension__ ({ \ const typeof(x) _c = MIN(x,y); \ MIN(_c, z); \ }) #define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b)) #define __LESS_BY(aq, a, bq, b) \ __extension__ ({ \ const typeof(a) UNIQ_T(A, aq) = (a); \ const typeof(b) UNIQ_T(B, bq) = (b); \ UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \ }) #undef CLAMP #define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high)) #define __CLAMP(xq, x, lowq, low, highq, high) \ __extension__ ({ \ const typeof(x) UNIQ_T(X,xq) = (x); \ const typeof(low) UNIQ_T(LOW,lowq) = (low); \ const typeof(high) UNIQ_T(HIGH,highq) = (high); \ UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ? \ UNIQ_T(HIGH,highq) : \ UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ? \ UNIQ_T(LOW,lowq) : \ UNIQ_T(X,xq); \ }) /* [(x + y - 1) / y] suffers from an integer overflow, even though the * computation should be possible in the given type. Therefore, we use * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the * quotient and the remainder, so both should be equally fast. */ #define DIV_ROUND_UP(_x, _y) \ __extension__ ({ \ const typeof(_x) __x = (_x); \ const typeof(_y) __y = (_y); \ (__x / __y + !!(__x % __y)); \ }) #define assert_message_se(expr, message) \ do { \ if (_unlikely_(!(expr))) \ log_assert_failed(message, __FILE__, __LINE__, __PRETTY_FUNCTION__); \ } while (false) #define assert_se(expr) assert_message_se(expr, #expr) /* We override the glibc assert() here. */ #undef assert #ifdef NDEBUG #define assert(expr) do {} while (false) #else #define assert(expr) assert_message_se(expr, #expr) #endif #define assert_not_reached(t) \ do { \ log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \ } while (false) #if defined(static_assert) /* static_assert() is sometimes defined in a way that trips up * -Wdeclaration-after-statement, hence let's temporarily turn off * this warning around it. */ #define assert_cc(expr) \ DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \ static_assert(expr, #expr); \ REENABLE_WARNING #else #define assert_cc(expr) \ DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \ struct CONCATENATE(_assert_struct_, __COUNTER__) { \ char x[(expr) ? 0 : -1]; \ }; \ REENABLE_WARNING #endif #define assert_log(expr, message) ((_likely_(expr)) \ ? (true) \ : (log_assert_failed_return(message, __FILE__, __LINE__, __PRETTY_FUNCTION__), false)) #define assert_return(expr, r) \ do { \ if (!assert_log(expr, #expr)) \ return (r); \ } while (false) #define assert_return_errno(expr, r, err) \ do { \ if (!assert_log(expr, #expr)) { \ errno = err; \ return (r); \ } \ } while (false) #define PTR_TO_INT(p) ((int) ((intptr_t) (p))) #define INT_TO_PTR(u) ((void *) ((intptr_t) (u))) #define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p))) #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u))) #define PTR_TO_LONG(p) ((long) ((intptr_t) (p))) #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u))) #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p))) #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u))) #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p))) #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u))) #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p))) #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u))) #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p))) #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u))) #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p))) #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u))) #define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p))) #define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u))) #define CHAR_TO_STR(x) ((char[2]) { x, 0 }) #define char_array_0(x) x[sizeof(x)-1] = 0; /* Returns the number of chars needed to format variables of the * specified type as a decimal string. Adds in extra space for a * negative '-' prefix (hence works correctly on signed * types). Includes space for the trailing NUL. */ #define DECIMAL_STR_MAX(type) \ (2+(sizeof(type) <= 1 ? 3 : \ sizeof(type) <= 2 ? 5 : \ sizeof(type) <= 4 ? 10 : \ sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)]))) #define DECIMAL_STR_WIDTH(x) \ ({ \ typeof(x) _x_ = (x); \ unsigned ans = 1; \ while (_x_ /= 10) \ ans++; \ ans; \ }) #define SET_FLAG(v, flag, b) \ (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag)) #define CASE_F(X) case X: #define CASE_F_1(CASE, X) CASE_F(X) #define CASE_F_2(CASE, X, ...) CASE(X) CASE_F_1(CASE, __VA_ARGS__) #define CASE_F_3(CASE, X, ...) CASE(X) CASE_F_2(CASE, __VA_ARGS__) #define CASE_F_4(CASE, X, ...) CASE(X) CASE_F_3(CASE, __VA_ARGS__) #define CASE_F_5(CASE, X, ...) CASE(X) CASE_F_4(CASE, __VA_ARGS__) #define CASE_F_6(CASE, X, ...) CASE(X) CASE_F_5(CASE, __VA_ARGS__) #define CASE_F_7(CASE, X, ...) CASE(X) CASE_F_6(CASE, __VA_ARGS__) #define CASE_F_8(CASE, X, ...) CASE(X) CASE_F_7(CASE, __VA_ARGS__) #define CASE_F_9(CASE, X, ...) CASE(X) CASE_F_8(CASE, __VA_ARGS__) #define CASE_F_10(CASE, X, ...) CASE(X) CASE_F_9(CASE, __VA_ARGS__) #define CASE_F_11(CASE, X, ...) CASE(X) CASE_F_10(CASE, __VA_ARGS__) #define CASE_F_12(CASE, X, ...) CASE(X) CASE_F_11(CASE, __VA_ARGS__) #define CASE_F_13(CASE, X, ...) CASE(X) CASE_F_12(CASE, __VA_ARGS__) #define CASE_F_14(CASE, X, ...) CASE(X) CASE_F_13(CASE, __VA_ARGS__) #define CASE_F_15(CASE, X, ...) CASE(X) CASE_F_14(CASE, __VA_ARGS__) #define CASE_F_16(CASE, X, ...) CASE(X) CASE_F_15(CASE, __VA_ARGS__) #define CASE_F_17(CASE, X, ...) CASE(X) CASE_F_16(CASE, __VA_ARGS__) #define CASE_F_18(CASE, X, ...) CASE(X) CASE_F_17(CASE, __VA_ARGS__) #define CASE_F_19(CASE, X, ...) CASE(X) CASE_F_18(CASE, __VA_ARGS__) #define CASE_F_20(CASE, X, ...) CASE(X) CASE_F_19(CASE, __VA_ARGS__) #define GET_CASE_F(_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,NAME,...) NAME #define FOR_EACH_MAKE_CASE(...) \ GET_CASE_F(__VA_ARGS__,CASE_F_20,CASE_F_19,CASE_F_18,CASE_F_17,CASE_F_16,CASE_F_15,CASE_F_14,CASE_F_13,CASE_F_12,CASE_F_11, \ CASE_F_10,CASE_F_9,CASE_F_8,CASE_F_7,CASE_F_6,CASE_F_5,CASE_F_4,CASE_F_3,CASE_F_2,CASE_F_1) \ (CASE_F,__VA_ARGS__) #define IN_SET(x, ...) \ ({ \ bool _found = false; \ /* If the build breaks in the line below, you need to extend the case macros */ \ static _unused_ char _static_assert__macros_need_to_be_extended[20 - sizeof((int[]){__VA_ARGS__})/sizeof(int)]; \ switch(x) { \ FOR_EACH_MAKE_CASE(__VA_ARGS__) \ _found = true; \ break; \ default: \ break; \ } \ _found; \ }) #define SWAP_TWO(x, y) do { \ typeof(x) _t = (x); \ (x) = (y); \ (y) = (_t); \ } while (false) /* Define C11 thread_local attribute even on older gcc compiler * version */ #ifndef thread_local /* * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__ * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769 */ #if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16)) #define thread_local _Thread_local #else #define thread_local __thread #endif #endif /* Define C11 noreturn without <stdnoreturn.h> and even on older gcc * compiler versions */ #ifndef noreturn #if __STDC_VERSION__ >= 201112L #define noreturn _Noreturn #else #define noreturn __attribute__((noreturn)) #endif #endif #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \ static inline void func##p(type *p) { \ if (*p) \ func(*p); \ } \ struct __useless_struct_to_allow_trailing_semicolon__ #include "log.h"