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Diffstat (limited to 'src/shared/macro.h')
| -rw-r--r-- | src/shared/macro.h | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/src/shared/macro.h b/src/shared/macro.h new file mode 100644 index 0000000000..2deaf04092 --- /dev/null +++ b/src/shared/macro.h @@ -0,0 +1,201 @@ +/*-*- 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 _pure_ __attribute__ ((pure)) +#define _const_ __attribute__ ((const)) +#define _packed_ __attribute__ ((packed)) +#define _malloc_ __attribute__ ((malloc)) +#define _likely_(x) (__builtin_expect(!!(x),1)) +#define _unlikely_(x) (__builtin_expect(!!(x),0)) +#define _public_ __attribute__ ((visibility("default"))) +#define _cleanup_(x) __attribute__((cleanup(x))) + + +#define DISABLE_WARNING_FORMAT_NONLITERAL \ + _Pragma("GCC diagnostic push"); \ + _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"") + +#define REENABLE_WARNING \ + _Pragma("GCC diagnostic pop") + +/* 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 + +static inline size_t ALIGN_TO(size_t l, size_t ali) { + return ((l + ali - 1) & ~(ali - 1)); +} + + +#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) \ + __extension__ ({ \ + const typeof( ((type *)0)->member ) *__mptr = (ptr); \ + (type *)( (char *)__mptr - offsetof(type,member) ); \ + }) + +#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) + +#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 memzero(x,l) (memset((x), 0, (l))) + +#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; +} + + /* Because statfs.t_type can be int on some architecures, 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. */ +#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 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 + +#include "log.h" |