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63 lines
2.3 KiB
63 lines
2.3 KiB
/******************************************************************************
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*
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* Copyright 2016 Google, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#define UNUSED_ATTR __attribute__((unused))
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#define INVALID_FD (-1)
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#define CONCAT(a, b) a##b
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// Use during compile time to check conditional values
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// NOTE: The the failures will present as a generic error
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// "error: initialization makes pointer from integer without a cast"
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// but the file and line number will present the condition that
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// failed.
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#define DUMMY_COUNTER(c) CONCAT(__osi_dummy_, c)
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#define DUMMY_PTR DUMMY_COUNTER(__COUNTER__)
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// Macros for safe integer to pointer conversion. In the C language, data is
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// commonly cast to opaque pointer containers and back for generic parameter
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// passing in callbacks. These macros should be used sparingly in new code
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// (never in C++ code). Whenever integers need to be passed as a pointer, use
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// these macros.
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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_INT(p) ((int)((intptr_t)(p)))
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#define INT_TO_PTR(i) ((void*)((intptr_t)(i)))
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// Obtain a random number between 0 and INT_MAX inclusive.
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// Taken from a system random source such as /dev/random.
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// No guarantees of distribution are made.
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// Effort is made for this to come from a real random source.
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int osi_rand(void);
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// Re-run |fn| system call until the system call doesn't cause EINTR.
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#define OSI_NO_INTR(fn) \
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do { \
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} while ((fn) == -1 && errno == EINTR)
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#ifndef FALLTHROUGH_INTENDED
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#define FALLTHROUGH_INTENDED [[clang::fallthrough]] // NOLINT
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#endif
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