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