X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fmacro.h;h=7f89951d62e00ee5f68809e017c2572f1e174770;hp=29d91392f8abc3848a3f454307ea9560f36a3a73;hb=b7ce6b592d8908d378904323a4a6670bfe0b7ab1;hpb=bac3c8eefe23a820caac930d41629cebafbfc7b2 diff --git a/src/shared/macro.h b/src/shared/macro.h index 29d91392f..7f89951d6 100644 --- a/src/shared/macro.h +++ b/src/shared/macro.h @@ -27,9 +27,9 @@ #include #include -#define _printf_attr_(a,b) __attribute__ ((format (printf, a, b))) +#define _printf_(a,b) __attribute__ ((format (printf, a, b))) +#define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__))) #define _sentinel_ __attribute__ ((sentinel)) -#define _noreturn_ __attribute__((noreturn)) #define _unused_ __attribute__ ((unused)) #define _destructor_ __attribute__ ((destructor)) #define _pure_ __attribute__ ((pure)) @@ -43,18 +43,85 @@ #define _public_ __attribute__ ((visibility("default"))) #define _hidden_ __attribute__ ((visibility("hidden"))) #define _weakref_(x) __attribute__((weakref(#x))) -#define _introspect_(x) __attribute__((section("introspect." 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__ + /* Rounds up */ -#define ALIGN(l) ALIGN_TO((l), sizeof(void*)) + +#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) (sizeof(x)/sizeof((x)[0])) /* @@ -62,43 +129,88 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) { * @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) ({ \ - const typeof( ((type *)0)->member ) *__mptr = (ptr); \ - (type *)( (char *)__mptr - offsetof(type,member) );}) - -#ifndef MAX -#define MAX(a,b) \ - __extension__ ({ \ - typeof(a) _a = (a); \ - typeof(b) _b = (b); \ - _a > _b ? _a : _b; \ +#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); \ }) -#endif - -#define MAX3(a,b,c) \ - MAX(MAX(a,b),c) -#ifndef MIN -#define MIN(a,b) \ - __extension__ ({ \ - typeof(a) _a = (a); \ - typeof(b) _b = (b); \ - _a < _b ? _a : _b; \ +#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); \ }) -#endif - -#define MIN3(a,b,c) \ - MIN(MIN(a,b),c) -#define CLAMP(x, low, high) \ +#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__ ({ \ - typeof(x) _x = (x); \ - typeof(low) _low = (low); \ - typeof(high) _high = (high); \ - ((_x > _high) ? _high : ((_x < _low) ? _low : _x)); \ - }) + 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_se(expr) \ do { \ @@ -120,42 +232,66 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) { } while (false) #if defined(static_assert) -#define assert_cc(expr) \ - do { \ - static_assert(expr, #expr); \ - } while (false) +/* 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) \ - do { \ - switch (0) { \ - case 0: \ - case !!(expr): \ - ; \ - } \ - } while (false) +#define assert_cc(expr) \ + DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \ + struct CONCATENATE(_assert_struct_, __COUNTER__) { \ + char x[(expr) ? 0 : -1]; \ + }; \ + REENABLE_WARNING #endif +#define assert_return(expr, r) \ + do { \ + if (_unlikely_(!(expr))) { \ + log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \ + 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 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 UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u))) -#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p))) -#define ULONG_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_INT(p) ((int) ((intptr_t) (p))) -#define INT_TO_PTR(u) ((void*) ((intptr_t) (u))) +#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p))) +#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u))) -#define TO_INT32(p) ((int32_t) ((intptr_t) (p))) -#define INT32_TO_PTR(u) ((void*) ((intptr_t) (u))) +/* The following macros add 1 when converting things, since UID 0 is a + * valid UID, while the pointer NULL is special */ +#define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1)) +#define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1)) -#define PTR_TO_LONG(p) ((long) ((intptr_t) (p))) -#define LONG_TO_PTR(u) ((void*) ((intptr_t) (u))) +#define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1)) +#define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1)) #define memzero(x,l) (memset((x), 0, (l))) #define zero(x) (memzero(&(x), sizeof(x))) +#define CHAR_TO_STR(x) ((char[2]) { x, 0 }) + #define char_array_0(x) x[sizeof(x)-1] = 0; #define IOVEC_SET_STRING(i, s) \ @@ -194,14 +330,6 @@ static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) { return k; } -#define _cleanup_free_ __attribute__((cleanup(freep))) -#define _cleanup_fclose_ __attribute__((cleanup(fclosep))) -#define _cleanup_close_ __attribute__((cleanup(closep))) -#define _cleanup_closedir_ __attribute__((cleanup(closedirp))) -#define _cleanup_umask_ __attribute__((cleanup(umaskp))) -#define _cleanup_set_free_ __attribute__((cleanup(set_freep))) -#define _cleanup_strv_free_ __attribute__((cleanup(strv_freep))) - #define VA_FORMAT_ADVANCE(format, ap) \ do { \ int _argtypes[128]; \ @@ -247,4 +375,87 @@ do { \ } \ } while(false) + /* Because statfs.t_type can be int on some architectures, we have to cast + * the const magic to the type, otherwise the compiler warns about + * signed/unsigned comparison, because the magic can be 32 bit unsigned. + */ +#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b) + +/* 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 SET_FLAG(v, flag, b) \ + (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag)) + +#define IN_SET(x, y, ...) \ + ({ \ + const typeof(y) _y = (y); \ + const typeof(_y) _x = (x); \ + unsigned _i; \ + bool _found = false; \ + for (_i = 0; _i < 1 + sizeof((const typeof(_x)[]) { __VA_ARGS__ })/sizeof(const typeof(_x)); _i++) \ + if (((const typeof(_x)[]) { _y, __VA_ARGS__ })[_i] == _x) { \ + _found = true; \ + break; \ + } \ + _found; \ + }) + +/* Return a nulstr for a standard cascade of configuration directories, + * suitable to pass to conf_files_list_nulstr or config_parse_many. */ +#define CONF_DIRS_NULSTR(n) \ + "/etc/" n ".d\0" \ + "/run/" n ".d\0" \ + "/usr/local/lib/" n ".d\0" \ + "/usr/lib/" n ".d\0" \ + CONF_DIR_SPLIT_USR(n) + +#ifdef HAVE_SPLIT_USR +#define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0" +#else +#define CONF_DIR_SPLIT_USR(n) +#endif + +/* 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 and even on older gcc + * compiler versions */ +#ifndef noreturn +#if __STDC_VERSION__ >= 201112L +#define noreturn _Noreturn +#else +#define noreturn __attribute__((noreturn)) +#endif +#endif + +#define UID_INVALID ((uid_t) -1) +#define GID_INVALID ((gid_t) -1) +#define MODE_INVALID ((mode_t) -1) + +#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"