1 /* Non-blocking I/O for pipe or socket descriptors.
2 Copyright (C) 2011-2012 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "nonblocking.h"
24 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
25 /* Native Windows API. */
27 # include <sys/ioctl.h>
28 # include <sys/socket.h>
31 /* Get declarations of the native Windows API functions. */
32 # define WIN32_LEAN_AND_MEAN
35 # include "msvc-nothrow.h"
38 get_nonblocking_flag (int desc)
40 HANDLE h = (HANDLE) _get_osfhandle (desc);
41 if (h == INVALID_HANDLE_VALUE)
46 if (GetFileType (h) == FILE_TYPE_PIPE)
48 /* h is a pipe or socket. */
50 if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0))
52 return (state & PIPE_NOWAIT) != 0;
59 /* The native Windows API does not support non-blocking on regular
65 set_nonblocking_flag (int desc, bool value)
67 HANDLE h = (HANDLE) _get_osfhandle (desc);
68 if (h == INVALID_HANDLE_VALUE)
73 if (GetFileType (h) == FILE_TYPE_PIPE)
75 /* h is a pipe or socket. */
77 if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0))
80 if ((state & PIPE_NOWAIT) != 0)
84 state &= ~PIPE_NOWAIT;
92 if (SetNamedPipeHandleState (h, &state, NULL, NULL))
101 return ioctl (desc, FIONBIO, &v);
106 /* The native Windows API does not support non-blocking on regular
120 # if GNULIB_defined_O_NONBLOCK
121 # error Please port nonblocking to your platform
124 /* We don't need the gnulib replacement of fcntl() here. */
128 get_nonblocking_flag (int desc)
132 fcntl_flags = fcntl (desc, F_GETFL, 0);
135 return (fcntl_flags & O_NONBLOCK) != 0;
139 set_nonblocking_flag (int desc, bool value)
143 fcntl_flags = fcntl (desc, F_GETFL, 0);
146 if (((fcntl_flags & O_NONBLOCK) != 0) == value)
149 fcntl_flags |= O_NONBLOCK;
151 fcntl_flags &= ~O_NONBLOCK;
152 return fcntl (desc, F_SETFL, fcntl_flags);