+
−/* Non-blocking I/O for pipe or socket descriptors.
+
−   Copyright (C) 2011-2013 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 of the License, 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 <http://www.gnu.org/licenses/>.  */
+
−
+
−#include <config.h>
+
−
+
−/* Specification.  */
+
−#include "nonblocking.h"
+
−
+
−#include <errno.h>
+
−
+
−#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+
−/* Native Windows API.  */
+
−
+
−# include <sys/ioctl.h>
+
−# include <sys/socket.h>
+
−# include <unistd.h>
+
−
+
−/* Get declarations of the native Windows API functions.  */
+
−# define WIN32_LEAN_AND_MEAN
+
−# include <windows.h>
+
−
+
−# include "msvc-nothrow.h"
+
−
+
−int
+
−get_nonblocking_flag (int desc)
+
−{
+
−  HANDLE h = (HANDLE) _get_osfhandle (desc);
+
−  if (h == INVALID_HANDLE_VALUE)
+
−    {
+
−      errno = EBADF;
+
−      return -1;
+
−    }
+
−  if (GetFileType (h) == FILE_TYPE_PIPE)
+
−    {
+
−      /* h is a pipe or socket.  */
+
−      DWORD state;
+
−      if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0))
+
−        /* h is a pipe.  */
+
−        return (state & PIPE_NOWAIT) != 0;
+
−      else
+
−        /* h is a socket.  */
+
−        errno = ENOSYS;
+
−        return -1;
+
−    }
+
−  else
+
−    /* The native Windows API does not support non-blocking on regular
+
−       files.  */
+
−    return 0;
+
−}
+
−
+
−int
+
−set_nonblocking_flag (int desc, bool value)
+
−{
+
−  HANDLE h = (HANDLE) _get_osfhandle (desc);
+
−  if (h == INVALID_HANDLE_VALUE)
+
−    {
+
−      errno = EBADF;
+
−      return -1;
+
−    }
+
−  if (GetFileType (h) == FILE_TYPE_PIPE)
+
−    {
+
−      /* h is a pipe or socket.  */
+
−      DWORD state;
+
−      if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0))
+
−        {
+
−          /* h is a pipe.  */
+
−          if ((state & PIPE_NOWAIT) != 0)
+
−            {
+
−              if (value)
+
−                return 0;
+
−              state &= ~PIPE_NOWAIT;
+
−            }
+
−          else
+
−            {
+
−              if (!value)
+
−                return 0;
+
−              state |= PIPE_NOWAIT;
+
−            }
+
−          if (SetNamedPipeHandleState (h, &state, NULL, NULL))
+
−            return 0;
+
−          errno = EINVAL;
+
−          return -1;
+
−        }
+
−      else
+
−        {
+
−          /* h is a socket.  */
+
−          int v = value;
+
−          return ioctl (desc, FIONBIO, &v);
+
−        }
+
−    }
+
−  else
+
−    {
+
−      /* The native Windows API does not support non-blocking on regular
+
−         files.  */
+
−      if (!value)
+
−        return 0;
+
−      errno = ENOTSUP;
+
−      return -1;
+
−    }
+
−}
+
−
+
−#else
+
−/* Unix API.  */
+
−
+
−# include <fcntl.h>
+
−
+
−# if GNULIB_defined_O_NONBLOCK
+
−#  error Please port nonblocking to your platform
+
−# endif
+
−
+
−/* We don't need the gnulib replacement of fcntl() here.  */
+
−# undef fcntl
+
−
+
−int
+
−get_nonblocking_flag (int desc)
+
−{
+
−  int fcntl_flags;
+
−
+
−  fcntl_flags = fcntl (desc, F_GETFL, 0);
+
−  if (fcntl_flags < 0)
+
−    return -1;
+
−  return (fcntl_flags & O_NONBLOCK) != 0;
+
−}
+
−
+
−int
+
−set_nonblocking_flag (int desc, bool value)
+
−{
+
−  int fcntl_flags;
+
−
+
−  fcntl_flags = fcntl (desc, F_GETFL, 0);
+
−  if (fcntl_flags < 0)
+
−    return -1;
+
−  if (((fcntl_flags & O_NONBLOCK) != 0) == value)
+
−    return 0;
+
−  if (value)
+
−    fcntl_flags |= O_NONBLOCK;
+
−  else
+
−    fcntl_flags &= ~O_NONBLOCK;
+
−  return fcntl (desc, F_SETFL, fcntl_flags);
+
−}
+
−
+
−#endif