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/*
This file is part of libmicrohttpd
Copyright (C) 2016 Karlson2k (Evgeny Grin)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file microhttpd/mhd_sockets.c
* @brief Header for platform-independent inter-thread communication
* @author Karlson2k (Evgeny Grin)
*
* Provides basic abstraction for inter-thread communication.
* Any functions can be implemented as macro on some platforms
* unless explicitly marked otherwise.
* Any function argument can be skipped in macro, so avoid
* variable modification in function parameters.
*/
#ifndef MHD_ITC_H
#define MHD_ITC_H 1
#include "mhd_options.h"
/* Force don't use pipes on W32 */
#if defined(_WIN32) && !defined(MHD_DONT_USE_PIPES)
#define MHD_DONT_USE_PIPES 1
#endif /* defined(_WIN32) && !defined(MHD_DONT_USE_PIPES) */
#ifndef MHD_DONT_USE_PIPES
# ifdef HAVE_STRING_H
# include <string.h> /* for strerror() */
# endif
#else
# include "mhd_sockets.h"
#endif /* MHD_DONT_USE_PIPES */
/* MHD_pipe is type for pipe FDs*/
#ifndef MHD_DONT_USE_PIPES
typedef int MHD_pipe;
#else /* ! MHD_DONT_USE_PIPES */
typedef MHD_socket MHD_pipe;
#endif /* ! MHD_DONT_USE_PIPES */
/* MHD_pipe_ create pipe (!MHD_DONT_USE_PIPES) /
* create two connected sockets (MHD_DONT_USE_PIPES) */
#ifndef MHD_DONT_USE_PIPES
# define MHD_pipe_(fdarr) pipe((fdarr))
#else /* MHD_DONT_USE_PIPES */
# if !defined(_WIN32) || defined(__CYGWIN__)
# define MHD_pipe_(fdarr) socketpair(AF_LOCAL, SOCK_STREAM, 0, (fdarr))
# else /* !defined(_WIN32) || defined(__CYGWIN__) */
# define MHD_pipe_(fdarr) MHD_W32_pair_of_sockets_((fdarr))
# endif /* !defined(_WIN32) || defined(__CYGWIN__) */
#endif /* MHD_DONT_USE_PIPES */
/* MHD_pipe_last_strerror_ is description string of last errno (!MHD_DONT_USE_PIPES) /
* description string of last pipe error (MHD_DONT_USE_PIPES) */
#ifndef MHD_DONT_USE_PIPES
# define MHD_pipe_last_strerror_() strerror(errno)
#else
# define MHD_pipe_last_strerror_() MHD_socket_last_strerr_()
#endif
/* MHD_pipe_write_ write data to real pipe (!MHD_DONT_USE_PIPES) /
* write data to emulated pipe (MHD_DONT_USE_PIPES) */
#ifndef MHD_DONT_USE_PIPES
# define MHD_pipe_write_(fd, ptr, sz) write((fd), (const void*)(ptr), (sz))
#else
# define MHD_pipe_write_(fd, ptr, sz) send((fd), (const char*)(ptr), (sz), 0)
#endif
/* MHD_pipe_drain_ drain data from real pipe (!MHD_DONT_USE_PIPES) /
* drain data from emulated pipe (MHD_DONT_USE_PIPES) */
#ifndef MHD_DONT_USE_PIPES
# define MHD_pipe_drain_(fd) do { long tmp; while (0 < read((fd), (void*)&tmp, sizeof (tmp))) ; } while (0)
#else
# define MHD_pipe_drain_(fd) do { long tmp; while (0 < recv((fd), (void*)&tmp, sizeof (tmp), 0)) ; } while (0)
#endif
/* MHD_pipe_close_(fd) close any FDs (non-W32) /
* close emulated pipe FDs (W32) */
#ifndef MHD_DONT_USE_PIPES
# define MHD_pipe_close_(fd) close((fd))
#else
# define MHD_pipe_close_(fd) MHD_socket_close_((fd))
#endif
/* MHD_INVALID_PIPE_ is a value of bad pipe FD */
#ifndef MHD_DONT_USE_PIPES
# define MHD_INVALID_PIPE_ (-1)
#else
# define MHD_INVALID_PIPE_ MHD_INVALID_SOCKET
#endif
#if defined(_WIN32) && !defined(__CYGWIN__)
/**
* Create pair of mutually connected TCP/IP sockets on loopback address
* @param sockets_pair array to receive resulted sockets
* @return zero on success, -1 otherwise
*/
int MHD_W32_pair_of_sockets_(SOCKET sockets_pair[2]);
#endif /* _WIN32 && ! __CYGWIN__ */
#endif /* MHD_ITC_H */
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