1 /* Non-blocking I/O for pipe or socket descriptors.
2 Copyright (C) 2011 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 Woe32 API. */
27 # include <sys/ioctl.h>
28 # include <sys/socket.h>
31 /* Get declarations of the Win32 API functions. */
32 # define WIN32_LEAN_AND_MEAN
36 get_nonblocking_flag (int desc)
38 HANDLE h = (HANDLE) _get_osfhandle (desc);
39 if (h == INVALID_HANDLE_VALUE)
44 if (GetFileType (h) == FILE_TYPE_PIPE)
46 /* h is a pipe or socket. */
48 if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0))
50 return (state & PIPE_NOWAIT) != 0;
57 /* Win32 does not support non-blocking on regular files. */
62 set_nonblocking_flag (int desc, bool value)
64 HANDLE h = (HANDLE) _get_osfhandle (desc);
65 if (h == INVALID_HANDLE_VALUE)
70 if (GetFileType (h) == FILE_TYPE_PIPE)
72 /* h is a pipe or socket. */
74 if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0))
77 if ((state & PIPE_NOWAIT) != 0)
81 state &= ~PIPE_NOWAIT;
89 if (SetNamedPipeHandleState (h, &state, NULL, NULL))
98 return ioctl (desc, FIONBIO, &v);
103 /* Win32 does not support non-blocking on regular files. */
116 # if GNULIB_defined_O_NONBLOCK
117 # error Please port nonblocking to your platform
120 /* We don't need the gnulib replacement of fcntl() here. */
124 get_nonblocking_flag (int desc)
128 fcntl_flags = fcntl (desc, F_GETFL, 0);
131 return (fcntl_flags & O_NONBLOCK) != 0;
135 set_nonblocking_flag (int desc, bool value)
139 fcntl_flags = fcntl (desc, F_GETFL, 0);
142 if (((fcntl_flags & O_NONBLOCK) != 0) == value)
145 fcntl_flags |= O_NONBLOCK;
147 fcntl_flags &= ~O_NONBLOCK;
148 return fcntl (desc, F_SETFL, fcntl_flags);