/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ #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 <sys/param.h> #include <sys/types.h> #include <sys/uio.h> #include <inttypes.h> #define _printf_(a,b) __attribute__ ((format (printf, a, b))) #define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__))) #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__ /* 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) (sizeof(x)/sizeof((x)[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_se(expr) \ do { \ if (_unlikely_(!(expr))) \ log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \ } while (false) \ /* We override the glibc assert() here. */ #undef assert #ifdef NDEBUG #define assert(expr) do {} while(false) #else #define assert(expr) assert_se(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) ((_likely_(expr)) \ ? (true) \ : (log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__), false)) #define assert_return(expr, r) \ do { \ if (!assert_log(expr)) \ return (r); \ } while (false) #define assert_return_errno(expr, r, err) \ do { \ if (!assert_log(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))) /* 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_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) \ do { \ struct iovec *_i = &(i); \ char *_s = (char *)(s); \ _i->iov_base = _s; \ _i->iov_len = strlen(_s); \ } while(false) static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) { unsigned j; size_t r = 0; for (j = 0; j < n; j++) r += i[j].iov_len; return r; } static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) { unsigned j; for (j = 0; j < n; j++) { size_t sub; if (_unlikely_(k <= 0)) break; sub = MIN(i[j].iov_len, k); i[j].iov_len -= sub; i[j].iov_base = (uint8_t*) i[j].iov_base + sub; k -= sub; } return k; } #define VA_FORMAT_ADVANCE(format, ap) \ do { \ int _argtypes[128]; \ size_t _i, _k; \ _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \ assert(_k < ELEMENTSOF(_argtypes)); \ for (_i = 0; _i < _k; _i++) { \ if (_argtypes[_i] & PA_FLAG_PTR) { \ (void) va_arg(ap, void*); \ continue; \ } \ \ switch (_argtypes[_i]) { \ case PA_INT: \ case PA_INT|PA_FLAG_SHORT: \ case PA_CHAR: \ (void) va_arg(ap, int); \ break; \ case PA_INT|PA_FLAG_LONG: \ (void) va_arg(ap, long int); \ break; \ case PA_INT|PA_FLAG_LONG_LONG: \ (void) va_arg(ap, long long int); \ break; \ case PA_WCHAR: \ (void) va_arg(ap, wchar_t); \ break; \ case PA_WSTRING: \ case PA_STRING: \ case PA_POINTER: \ (void) va_arg(ap, void*); \ break; \ case PA_FLOAT: \ case PA_DOUBLE: \ (void) va_arg(ap, double); \ break; \ case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \ (void) va_arg(ap, long double); \ break; \ default: \ assert_not_reached("Unknown format string argument."); \ } \ } \ } 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, ...) \ ({ \ static const typeof(y) _array[] = { (y), __VA_ARGS__ }; \ const typeof(y) _x = (x); \ unsigned _i; \ bool _found = false; \ for (_i = 0; _i < ELEMENTSOF(_array); _i++) \ if (_array[_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 <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 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__ #define CMSG_FOREACH(cmsg, mh) \ for ((cmsg) = CMSG_FIRSTHDR(mh); (cmsg); (cmsg) = CMSG_NXTHDR((mh), (cmsg))) #include "log.h"