488 lines
21 KiB
C
488 lines
21 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <assert.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <inttypes.h>
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#include <stdbool.h>
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#define _printf_(a,b) __attribute__ ((format (printf, a, b)))
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#define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
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#define _sentinel_ __attribute__ ((sentinel))
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#define _unused_ __attribute__ ((unused))
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#define _destructor_ __attribute__ ((destructor))
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#define _pure_ __attribute__ ((pure))
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#define _const_ __attribute__ ((const))
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#define _deprecated_ __attribute__ ((deprecated))
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#define _packed_ __attribute__ ((packed))
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#define _malloc_ __attribute__ ((malloc))
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#define _weak_ __attribute__ ((weak))
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#define _likely_(x) (__builtin_expect(!!(x),1))
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#define _unlikely_(x) (__builtin_expect(!!(x),0))
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#define _public_ __attribute__ ((visibility("default")))
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#define _hidden_ __attribute__ ((visibility("hidden")))
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#define _weakref_(x) __attribute__((weakref(#x)))
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#define _alignas_(x) __attribute__((aligned(__alignof(x))))
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#define _cleanup_(x) __attribute__((cleanup(x)))
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/* Temporarily disable some warnings */
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#define DISABLE_WARNING_DECLARATION_AFTER_STATEMENT \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Wdeclaration-after-statement\"")
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#define DISABLE_WARNING_FORMAT_NONLITERAL \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
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#define DISABLE_WARNING_MISSING_PROTOTYPES \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")
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#define DISABLE_WARNING_NONNULL \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Wnonnull\"")
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#define DISABLE_WARNING_SHADOW \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Wshadow\"")
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#define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
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#define REENABLE_WARNING \
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_Pragma("GCC diagnostic pop")
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/* automake test harness */
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#define EXIT_TEST_SKIP 77
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#define XSTRINGIFY(x) #x
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#define STRINGIFY(x) XSTRINGIFY(x)
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#define XCONCATENATE(x, y) x ## y
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#define CONCATENATE(x, y) XCONCATENATE(x, y)
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#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
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#define UNIQ __COUNTER__
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/* Rounds up */
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#define ALIGN4(l) (((l) + 3) & ~3)
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#define ALIGN8(l) (((l) + 7) & ~7)
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#if __SIZEOF_POINTER__ == 8
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#define ALIGN(l) ALIGN8(l)
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#elif __SIZEOF_POINTER__ == 4
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#define ALIGN(l) ALIGN4(l)
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#else
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#error "Wut? Pointers are neither 4 nor 8 bytes long?"
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#endif
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#define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
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#define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
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#define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
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static inline size_t ALIGN_TO(size_t l, size_t ali) {
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return ((l + ali - 1) & ~(ali - 1));
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}
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#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
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/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
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static inline unsigned long ALIGN_POWER2(unsigned long u) {
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/* clz(0) is undefined */
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if (u == 1)
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return 1;
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/* left-shift overflow is undefined */
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if (__builtin_clzl(u - 1UL) < 1)
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return 0;
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return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
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}
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#define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
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/*
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* container_of - cast a member of a structure out to the containing structure
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* @ptr: the pointer to the member.
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* @type: the type of the container struct this is embedded in.
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* @member: the name of the member within the struct.
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*/
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#define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
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#define __container_of(uniq, ptr, type, member) \
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__extension__ ({ \
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const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \
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(type*)( (char *)UNIQ_T(A, uniq) - offsetof(type,member) ); \
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})
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#undef MAX
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#define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
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#define __MAX(aq, a, bq, b) \
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__extension__ ({ \
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const typeof(a) UNIQ_T(A, aq) = (a); \
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const typeof(b) UNIQ_T(B, bq) = (b); \
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UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
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})
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/* evaluates to (void) if _A or _B are not constant or of different types */
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#define CONST_MAX(_A, _B) \
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__extension__ (__builtin_choose_expr( \
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__builtin_constant_p(_A) && \
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__builtin_constant_p(_B) && \
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__builtin_types_compatible_p(typeof(_A), typeof(_B)), \
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((_A) > (_B)) ? (_A) : (_B), \
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(void)0))
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/* takes two types and returns the size of the larger one */
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#define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
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#define MAX3(x,y,z) \
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__extension__ ({ \
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const typeof(x) _c = MAX(x,y); \
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MAX(_c, z); \
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})
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#undef MIN
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#define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
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#define __MIN(aq, a, bq, b) \
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__extension__ ({ \
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const typeof(a) UNIQ_T(A, aq) = (a); \
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const typeof(b) UNIQ_T(B, bq) = (b); \
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UNIQ_T(A,aq) < UNIQ_T(B,bq) ? UNIQ_T(A,aq) : UNIQ_T(B,bq); \
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})
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#define MIN3(x,y,z) \
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__extension__ ({ \
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const typeof(x) _c = MIN(x,y); \
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MIN(_c, z); \
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})
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#define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
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#define __LESS_BY(aq, a, bq, b) \
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__extension__ ({ \
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const typeof(a) UNIQ_T(A, aq) = (a); \
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const typeof(b) UNIQ_T(B, bq) = (b); \
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UNIQ_T(A,aq) > UNIQ_T(B,bq) ? UNIQ_T(A,aq) - UNIQ_T(B,bq) : 0; \
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})
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#undef CLAMP
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#define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
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#define __CLAMP(xq, x, lowq, low, highq, high) \
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__extension__ ({ \
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const typeof(x) UNIQ_T(X,xq) = (x); \
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const typeof(low) UNIQ_T(LOW,lowq) = (low); \
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const typeof(high) UNIQ_T(HIGH,highq) = (high); \
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UNIQ_T(X,xq) > UNIQ_T(HIGH,highq) ? \
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UNIQ_T(HIGH,highq) : \
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UNIQ_T(X,xq) < UNIQ_T(LOW,lowq) ? \
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UNIQ_T(LOW,lowq) : \
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UNIQ_T(X,xq); \
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})
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/* [(x + y - 1) / y] suffers from an integer overflow, even though the
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* computation should be possible in the given type. Therefore, we use
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* [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
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* quotient and the remainder, so both should be equally fast. */
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#define DIV_ROUND_UP(_x, _y) \
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__extension__ ({ \
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const typeof(_x) __x = (_x); \
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const typeof(_y) __y = (_y); \
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(__x / __y + !!(__x % __y)); \
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})
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#define assert_se(expr) \
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do { \
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if (_unlikely_(!(expr))) \
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log_assert_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
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} while (false) \
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/* We override the glibc assert() here. */
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#undef assert
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#ifdef NDEBUG
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#define assert(expr) do {} while(false)
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#else
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#define assert(expr) assert_se(expr)
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#endif
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#define assert_not_reached(t) \
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do { \
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log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
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} while (false)
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#if defined(static_assert)
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/* static_assert() is sometimes defined in a way that trips up
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* -Wdeclaration-after-statement, hence let's temporarily turn off
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* this warning around it. */
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#define assert_cc(expr) \
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DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
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static_assert(expr, #expr); \
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REENABLE_WARNING
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#else
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#define assert_cc(expr) \
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DISABLE_WARNING_DECLARATION_AFTER_STATEMENT; \
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struct CONCATENATE(_assert_struct_, __COUNTER__) { \
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char x[(expr) ? 0 : -1]; \
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}; \
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REENABLE_WARNING
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#endif
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#define assert_log(expr) ((_likely_(expr)) \
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? (true) \
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: (log_assert_failed_return(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))
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#define assert_return(expr, r) \
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do { \
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if (!assert_log(expr)) \
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return (r); \
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} while (false)
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#define assert_return_errno(expr, r, err) \
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do { \
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if (!assert_log(expr)) { \
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errno = err; \
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return (r); \
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} \
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} while (false)
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#define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
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#define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
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#define PTR_TO_UINT(p) ((unsigned int) ((uintptr_t) (p)))
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#define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
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#define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
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#define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
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#define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
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#define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
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#define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
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#define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
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#define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
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#define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
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#define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
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#define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
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#define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
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#define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
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#define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
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#define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
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/* The following macros add 1 when converting things, since UID 0 is a
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* valid UID, while the pointer NULL is special */
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#define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1))
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#define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
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#define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1))
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#define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1))
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#define memzero(x,l) (memset((x), 0, (l)))
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#define zero(x) (memzero(&(x), sizeof(x)))
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#define CHAR_TO_STR(x) ((char[2]) { x, 0 })
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#define char_array_0(x) x[sizeof(x)-1] = 0;
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#define IOVEC_SET_STRING(i, s) \
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do { \
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struct iovec *_i = &(i); \
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char *_s = (char *)(s); \
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_i->iov_base = _s; \
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_i->iov_len = strlen(_s); \
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} while(false)
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static inline size_t IOVEC_TOTAL_SIZE(const struct iovec *i, unsigned n) {
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unsigned j;
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size_t r = 0;
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for (j = 0; j < n; j++)
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r += i[j].iov_len;
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return r;
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}
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static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) {
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unsigned j;
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for (j = 0; j < n; j++) {
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size_t sub;
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if (_unlikely_(k <= 0))
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break;
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sub = MIN(i[j].iov_len, k);
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i[j].iov_len -= sub;
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i[j].iov_base = (uint8_t*) i[j].iov_base + sub;
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k -= sub;
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}
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return k;
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}
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#define VA_FORMAT_ADVANCE(format, ap) \
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do { \
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int _argtypes[128]; \
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size_t _i, _k; \
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_k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
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assert(_k < ELEMENTSOF(_argtypes)); \
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for (_i = 0; _i < _k; _i++) { \
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if (_argtypes[_i] & PA_FLAG_PTR) { \
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(void) va_arg(ap, void*); \
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continue; \
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} \
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\
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switch (_argtypes[_i]) { \
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case PA_INT: \
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case PA_INT|PA_FLAG_SHORT: \
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case PA_CHAR: \
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(void) va_arg(ap, int); \
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break; \
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case PA_INT|PA_FLAG_LONG: \
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(void) va_arg(ap, long int); \
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break; \
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case PA_INT|PA_FLAG_LONG_LONG: \
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(void) va_arg(ap, long long int); \
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break; \
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case PA_WCHAR: \
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(void) va_arg(ap, wchar_t); \
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break; \
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case PA_WSTRING: \
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case PA_STRING: \
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case PA_POINTER: \
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(void) va_arg(ap, void*); \
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break; \
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case PA_FLOAT: \
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case PA_DOUBLE: \
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(void) va_arg(ap, double); \
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break; \
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case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
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(void) va_arg(ap, long double); \
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break; \
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default: \
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assert_not_reached("Unknown format string argument."); \
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} \
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} \
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} while(false)
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/* Because statfs.t_type can be int on some architectures, we have to cast
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* the const magic to the type, otherwise the compiler warns about
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* signed/unsigned comparison, because the magic can be 32 bit unsigned.
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*/
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#define F_TYPE_EQUAL(a, b) (a == (typeof(a)) b)
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/* Returns the number of chars needed to format variables of the
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* specified type as a decimal string. Adds in extra space for a
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* negative '-' prefix (hence works correctly on signed
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* types). Includes space for the trailing NUL. */
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#define DECIMAL_STR_MAX(type) \
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(2+(sizeof(type) <= 1 ? 3 : \
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sizeof(type) <= 2 ? 5 : \
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sizeof(type) <= 4 ? 10 : \
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sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
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#define SET_FLAG(v, flag, b) \
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(v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
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#define IN_SET(x, y, ...) \
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({ \
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static const typeof(y) _array[] = { (y), __VA_ARGS__ }; \
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const typeof(y) _x = (x); \
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unsigned _i; \
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bool _found = false; \
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for (_i = 0; _i < ELEMENTSOF(_array); _i++) \
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if (_array[_i] == _x) { \
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_found = true; \
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break; \
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} \
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_found; \
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})
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/* Return a nulstr for a standard cascade of configuration directories,
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* suitable to pass to conf_files_list_nulstr or config_parse_many. */
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#define CONF_DIRS_NULSTR(n) \
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"/etc/" n ".d\0" \
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"/run/" n ".d\0" \
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"/usr/local/lib/" n ".d\0" \
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"/usr/lib/" n ".d\0" \
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CONF_DIR_SPLIT_USR(n)
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#ifdef HAVE_SPLIT_USR
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#define CONF_DIR_SPLIT_USR(n) "/lib/" n ".d\0"
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#else
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#define CONF_DIR_SPLIT_USR(n)
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#endif
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/* Define C11 thread_local attribute even on older gcc compiler
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* version */
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#ifndef thread_local
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/*
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* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
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* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
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*/
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#if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
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#define thread_local _Thread_local
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#else
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#define thread_local __thread
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#endif
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#endif
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|
|
/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
|
|
* compiler versions */
|
|
#ifndef noreturn
|
|
#if __STDC_VERSION__ >= 201112L
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|
#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)
|
|
|
|
static inline bool UID_IS_INVALID(uid_t uid) {
|
|
/* We consider both the old 16bit -1 user and the newer 32bit
|
|
* -1 user invalid, since they are or used to be incompatible
|
|
* with syscalls such as setresuid() or chown(). */
|
|
|
|
return uid == (uid_t) ((uint32_t) -1) || uid == (uid_t) ((uint16_t) -1);
|
|
}
|
|
|
|
static inline bool GID_IS_INVALID(gid_t gid) {
|
|
return gid == (gid_t) ((uint32_t) -1) || gid == (gid_t) ((uint16_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"
|