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systemd/src/shared/macro.h
Lennart Poettering 5f86c1f4c4 sd-bus: rework ELF error mapping table magic 
The ELF magic cannot work for consumers of our shard library, since they
are in a different module. Hence make all the ELF magic private, and
instead introduce a public function to register additional static
mapping table.
2014-12-08 14:55:22 +01:00

431 lines
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C
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/*-*- 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 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); \
})
#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_, __LINE__) { \
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 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 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. */
#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 <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)
#include "log.h"
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