1 /* ioctl.c --- wrappers for Windows ioctl function
2
3 Copyright (C) 2008-2021 Free Software Foundation, Inc.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 /* Written by Paolo Bonzini */
19
20 #include <config.h>
21
22 #include <sys/ioctl.h>
23
24 #include <stdarg.h>
25
26 #if HAVE_IOCTL
27
28 /* Provide a wrapper with the POSIX prototype. */
29 # undef ioctl
30 int
rpl_ioctl(int fd,int request,...)31 rpl_ioctl (int fd, int request, ... /* {void *,char *} arg */)
32 {
33 void *buf;
34 va_list args;
35
36 va_start (args, request);
37 buf = va_arg (args, void *);
38 va_end (args);
39
40 /* Cast 'request' so that when the system's ioctl function takes a 64-bit
41 request argument, the value gets zero-extended, not sign-extended. */
42 return ioctl (fd, (unsigned int) request, buf);
43 }
44
45 #else /* mingw */
46
47 # include <errno.h>
48
49 /* Get HANDLE. */
50 # define WIN32_LEAN_AND_MEAN
51 # include <windows.h>
52
53 # include "fd-hook.h"
54 /* Get _get_osfhandle. */
55 # if GNULIB_MSVC_NOTHROW
56 # include "msvc-nothrow.h"
57 # else
58 # include <io.h>
59 # endif
60
61 static int
primary_ioctl(int fd,int request,void * arg)62 primary_ioctl (int fd, int request, void *arg)
63 {
64 /* We don't support FIONBIO on pipes here. If you want to make pipe
65 fds non-blocking, use the gnulib 'nonblocking' module, until
66 gnulib implements fcntl F_GETFL / F_SETFL with O_NONBLOCK. */
67
68 if ((HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE)
69 errno = ENOSYS;
70 else
71 errno = EBADF;
72 return -1;
73 }
74
75 int
ioctl(int fd,int request,...)76 ioctl (int fd, int request, ... /* {void *,char *} arg */)
77 {
78 void *arg;
79 va_list args;
80
81 va_start (args, request);
82 arg = va_arg (args, void *);
83 va_end (args);
84
85 # if WINDOWS_SOCKETS
86 return execute_all_ioctl_hooks (primary_ioctl, fd, request, arg);
87 # else
88 return primary_ioctl (fd, request, arg);
89 # endif
90 }
91
92 #endif
93