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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef UV_UNIX_INTERNAL_H_
#define UV_UNIX_INTERNAL_H_

#include "uv-common.h"

#include <assert.h>
#include <stdlib.h> /* abort */
#include <string.h> /* strrchr */
#include <fcntl.h>  /* O_CLOEXEC, may be */
#include <stdio.h>
#include <errno.h>

#if defined(__STRICT_ANSI__)
# define inline __inline
#endif

#if defined(__linux__)
# include "linux-syscalls.h"
#endif /* __linux__ */

#if defined(__MVS__)
# include "os390-syscalls.h"
#endif /* __MVS__ */

#if defined(__sun)
# include <sys/port.h>
# include <port.h>
#endif /* __sun */

#if defined(_AIX)
# define reqevents events
# define rtnevents revents
# include <sys/poll.h>
#else
# include <poll.h>
#endif /* _AIX */

#if defined(__APPLE__) && !TARGET_OS_IPHONE
# include <AvailabilityMacros.h>
#endif

#if defined(__ANDROID__)
int uv__pthread_sigmask(int how, const sigset_t* set, sigset_t* oset);
# ifdef pthread_sigmask
# undef pthread_sigmask
# endif
# define pthread_sigmask(how, set, oldset) uv__pthread_sigmask(how, set, oldset)
#endif

#define ACCESS_ONCE(type, var)                                                \
  (*(volatile type*) &(var))

#define ROUND_UP(a, b)                                                        \
  ((a) % (b) ? ((a) + (b)) - ((a) % (b)) : (a))

#define UNREACHABLE()                                                         \
  do {                                                                        \
    assert(0 && "unreachable code");                                          \
    abort();                                                                  \
  }                                                                           \
  while (0)

#define SAVE_ERRNO(block)                                                     \
  do {                                                                        \
    int _saved_errno = errno;                                                 \
    do { block; } while (0);                                                  \
    errno = _saved_errno;                                                     \
  }                                                                           \
  while (0)

/* The __clang__ and __INTEL_COMPILER checks are superfluous because they
 * define __GNUC__. They are here to convey to you, dear reader, that these
 * macros are enabled when compiling with clang or icc.
 */
#if defined(__clang__) ||                                                     \
    defined(__GNUC__) ||                                                      \
    defined(__INTEL_COMPILER)
# define UV_DESTRUCTOR(declaration) __attribute__((destructor)) declaration
# define UV_UNUSED(declaration)     __attribute__((unused)) declaration
#else
# define UV_DESTRUCTOR(declaration) declaration
# define UV_UNUSED(declaration)     declaration
#endif

/* Leans on the fact that, on Linux, POLLRDHUP == EPOLLRDHUP. */
#ifdef POLLRDHUP
# define UV__POLLRDHUP POLLRDHUP
#else
# define UV__POLLRDHUP 0x2000
#endif

#ifdef POLLPRI
# define UV__POLLPRI POLLPRI
#else
# define UV__POLLPRI 0
#endif

#if !defined(O_CLOEXEC) && defined(__FreeBSD__)
/*