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/* Non-blocking I/O for pipe or socket descriptors.
Copyright (C) 2011-2024 Free Software Foundation, Inc.
This file 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 file 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 program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "nonblocking.h"
#include <errno.h>
#if 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>
# if GNULIB_MSVC_NOTHROW
# include "msvc-nothrow.h"
# else
# include <io.h>
# endif
/* Don't assume that UNICODE is not defined. */
# undef GetNamedPipeHandleState
# define GetNamedPipeHandleState GetNamedPipeHandleStateA
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
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