// Copyright (c) 2009-2010 Satoshi Nakamoto

// Copyright (c) 2009-2022 The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_COMPAT_COMPAT_H

#define BITCOIN_COMPAT_COMPAT_H

// Windows defines FD_SETSIZE to 64 (see _fd_types.h in mingw-w64),

// which is too small for our usage, but allows us to redefine it safely.

// We redefine it to be 1024, to match glibc, see typesizes.h.

#ifdef WIN32

#ifdef FD_SETSIZE

#undef FD_SETSIZE

#endif

#define FD_SETSIZE 1024

#include <winsock2.h>

#include <ws2tcpip.h>

#include <cstdint>

#else

#include <arpa/inet.h>   // IWYU pragma: export

#include <fcntl.h>       // IWYU pragma: export

#include <net/if.h>      // IWYU pragma: export

#include <netdb.h>       // IWYU pragma: export

#include <netinet/in.h>  // IWYU pragma: export

#include <netinet/tcp.h> // IWYU pragma: export

#include <sys/mman.h>    // IWYU pragma: export

#include <sys/select.h>  // IWYU pragma: export

#include <sys/socket.h>  // IWYU pragma: export

#include <sys/types.h>   // IWYU pragma: export

#include <unistd.h>      // IWYU pragma: export

#endif

// Windows does not have `sa_family_t` - it defines `sockaddr::sa_family` as `u_short`.

// Thus define `sa_family_t` on Windows too so that the rest of the code can use `sa_family_t`.

// See https://learn.microsoft.com/en-us/windows/win32/api/winsock/ns-winsock-sockaddr#syntax

#ifdef WIN32

typedef u_short sa_family_t;

#endif

// We map Linux / BSD error functions and codes, to the equivalent

// Windows definitions, and use the WSA* names throughout our code.

// Note that glibc defines EWOULDBLOCK as EAGAIN (see errno.h).

#ifndef WIN32

typedef unsigned int SOCKET;

#include <cerrno>

#define WSAGetLastError()   errno

#define WSAEINVAL           EINVAL

#define WSAEWOULDBLOCK      EWOULDBLOCK

#define WSAEAGAIN           EAGAIN

#define WSAEMSGSIZE         EMSGSIZE

#define WSAEINTR            EINTR

#define WSAEINPROGRESS      EINPROGRESS

#define WSAEADDRINUSE       EADDRINUSE

#define INVALID_SOCKET      (SOCKET)(~0)

#define SOCKET_ERROR        -1

#else

// WSAEAGAIN doesn't exist on Windows

#ifdef EAGAIN

#define WSAEAGAIN EAGAIN

#else

#define WSAEAGAIN WSAEWOULDBLOCK

#endif

#endif

// Windows defines MAX_PATH as it's maximum path length.

// We define MAX_PATH for use on non-Windows systems.

#ifndef WIN32

#define MAX_PATH            1024

#endif

// ssize_t is POSIX, and not present when using MSVC.

#ifdef _MSC_VER

#include <BaseTsd.h>

typedef SSIZE_T ssize_t;

#endif

// The type of the option value passed to getsockopt & setsockopt

// differs between Windows and non-Windows.

#ifndef WIN32

typedef void* sockopt_arg_type;

#else

typedef char* sockopt_arg_type;

#endif

#ifdef WIN32

// Export main() and ensure working ASLR when using mingw-w64.

// Exporting a symbol will prevent the linker from stripping

// the .reloc section from the binary, which is a requirement

// for ASLR. While release builds are not affected, anyone

// building with a binutils < 2.36 is subject to this ld bug.

#define MAIN_FUNCTION __declspec(dllexport) int main(int argc, char* argv[])

#else

#define MAIN_FUNCTION int main(int argc, char* argv[])

#endif

// Note these both should work with the current usage of poll, but best to be safe

// WIN32 poll is broken https://daniel.haxx.se/blog/2012/10/10/wsapoll-is-broken/

// __APPLE__ poll is broke https://github.com/bitcoin/bitcoin/pull/14336#issuecomment-437384408

#if defined(__linux__)

#define USE_POLL

#endif

// MSG_NOSIGNAL is not available on some platforms, if it doesn't exist define it as 0

#if !defined(MSG_NOSIGNAL)

#define MSG_NOSIGNAL 0

#endif

// MSG_DONTWAIT is not available on some platforms, if it doesn't exist define it as 0

#if !defined(MSG_DONTWAIT)

#define MSG_DONTWAIT 0

#endif

#endif // BITCOIN_COMPAT_COMPAT_H