/* Test of pipe.

   Copyright (C) 2009-2019 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

#include <unistd.h>

#include "signature.h"

SIGNATURE_CHECK (pipe, int, (int[2]));

#include <fcntl.h>

#include <stdbool.h>

#if defined _WIN32 && ! defined __CYGWIN__

/* Get declarations of the native Windows API functions.  */

# define WIN32_LEAN_AND_MEAN

# include <windows.h>

/* Get _get_osfhandle.  */

# if GNULIB_MSVC_NOTHROW

#  include "msvc-nothrow.h"

# else

#  include <io.h>

# endif

#endif

#include "binary-io.h"

#include "macros.h"

/* Return true if FD is open.  */

static bool

is_open (int fd)

{

#if defined _WIN32 && ! defined __CYGWIN__

  /* On native Windows, the initial state of unassigned standard file

     descriptors is that they are open but point to an

     INVALID_HANDLE_VALUE, and there is no fcntl.  */

  return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;

#else

# ifndef F_GETFL

#  error Please port fcntl to your platform

# endif

  return 0 <= fcntl (fd, F_GETFL);

#endif

}

/* Return true if FD is not inherited to child processes.  */

static bool

is_cloexec (int fd)

{

#if defined _WIN32 && ! defined __CYGWIN__

  HANDLE h = (HANDLE) _get_osfhandle (fd);

  DWORD flags;

  ASSERT (GetHandleInformation (h, &flags));

  return (flags & HANDLE_FLAG_INHERIT) == 0;

#else

  int flags;

  ASSERT ((flags = fcntl (fd, F_GETFD)) >= 0);

  return (flags & FD_CLOEXEC) != 0;

#endif

}

/* Return true if FD is in non-blocking mode.  */

static bool

is_nonblocking (int fd)

{

#if defined _WIN32 && ! defined __CYGWIN__

  /* We don't use the non-blocking mode for sockets here.  */

  return 0;

#else

  int flags;

  ASSERT ((flags = fcntl (fd, F_GETFL)) >= 0);

  return (flags & O_NONBLOCK) != 0;

#endif

}

int

main ()

{

  int fd[2];

  fd[0] = -1;

  fd[1] = -1;

  ASSERT (pipe (fd) >= 0);

  ASSERT (fd[0] >= 0);

  ASSERT (fd[1] >= 0);

  ASSERT (fd[0] != fd[1]);

  ASSERT (is_open (fd[0]));

  ASSERT (is_open (fd[1]));

  ASSERT (!is_cloexec (fd[0]));

  ASSERT (!is_cloexec (fd[1]));

  ASSERT (!is_nonblocking (fd[0]));

  ASSERT (!is_nonblocking (fd[1]));

  return 0;

}