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1 | /* sockets.c --- wrappers for Windows socket functions |
2 | ||
49114fd4 | 3 | Copyright (C) 2008-2011 Free Software Foundation, Inc. |
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4 | |
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU Lesser 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 Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | /* Written by Simon Josefsson */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | /* Specification. */ | |
23 | #include "sockets.h" | |
24 | ||
25 | #if WINDOWS_SOCKETS | |
26 | ||
27 | /* This includes winsock2.h on MinGW. */ | |
28 | # include <sys/socket.h> | |
29 | ||
dd7d0148 | 30 | # include "fd-hook.h" |
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31 | |
32 | /* Get set_winsock_errno, FD_TO_SOCKET etc. */ | |
33 | # include "w32sock.h" | |
34 | ||
35 | static int | |
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36 | close_fd_maybe_socket (const struct fd_hook *remaining_list, |
37 | gl_close_fn primary, | |
38 | int fd) | |
0f00f2c3 | 39 | { |
3d458a81 AW |
40 | /* Note about multithread-safety: There is a race condition where, between |
41 | our calls to closesocket() and the primary close(), some other thread | |
42 | could make system calls that allocate precisely the same HANDLE value | |
43 | as sock; then the primary close() would call CloseHandle() on it. */ | |
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44 | SOCKET sock; |
45 | WSANETWORKEVENTS ev; | |
46 | ||
47 | /* Test whether fd refers to a socket. */ | |
48 | sock = FD_TO_SOCKET (fd); | |
49 | ev.lNetworkEvents = 0xDEADBEEF; | |
50 | WSAEnumNetworkEvents (sock, NULL, &ev); | |
51 | if (ev.lNetworkEvents != 0xDEADBEEF) | |
52 | { | |
53 | /* fd refers to a socket. */ | |
54 | /* FIXME: other applications, like squid, use an undocumented | |
55 | _free_osfhnd free function. But this is not enough: The 'osfile' | |
56 | flags for fd also needs to be cleared, but it is hard to access it. | |
57 | Instead, here we just close twice the file descriptor. */ | |
58 | if (closesocket (sock)) | |
59 | { | |
60 | set_winsock_errno (); | |
61 | return -1; | |
62 | } | |
63 | else | |
64 | { | |
65 | /* This call frees the file descriptor and does a | |
66 | CloseHandle ((HANDLE) _get_osfhandle (fd)), which fails. */ | |
67 | _close (fd); | |
68 | return 0; | |
69 | } | |
70 | } | |
71 | else | |
72 | /* Some other type of file descriptor. */ | |
dd7d0148 | 73 | return execute_close_hooks (remaining_list, primary, fd); |
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74 | } |
75 | ||
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76 | static int |
77 | ioctl_fd_maybe_socket (const struct fd_hook *remaining_list, | |
78 | gl_ioctl_fn primary, | |
79 | int fd, int request, void *arg) | |
80 | { | |
81 | SOCKET sock; | |
82 | WSANETWORKEVENTS ev; | |
83 | ||
84 | /* Test whether fd refers to a socket. */ | |
85 | sock = FD_TO_SOCKET (fd); | |
86 | ev.lNetworkEvents = 0xDEADBEEF; | |
87 | WSAEnumNetworkEvents (sock, NULL, &ev); | |
88 | if (ev.lNetworkEvents != 0xDEADBEEF) | |
89 | { | |
90 | /* fd refers to a socket. */ | |
91 | if (ioctlsocket (sock, request, arg) < 0) | |
92 | { | |
93 | set_winsock_errno (); | |
94 | return -1; | |
95 | } | |
96 | else | |
97 | return 0; | |
98 | } | |
99 | else | |
100 | /* Some other type of file descriptor. */ | |
101 | return execute_ioctl_hooks (remaining_list, primary, fd, request, arg); | |
102 | } | |
103 | ||
104 | static struct fd_hook fd_sockets_hook; | |
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105 | |
106 | static int initialized_sockets_version /* = 0 */; | |
107 | ||
108 | #endif /* WINDOWS_SOCKETS */ | |
109 | ||
110 | int | |
111 | gl_sockets_startup (int version _GL_UNUSED) | |
112 | { | |
113 | #if WINDOWS_SOCKETS | |
114 | if (version > initialized_sockets_version) | |
115 | { | |
116 | WSADATA data; | |
117 | int err; | |
118 | ||
119 | err = WSAStartup (version, &data); | |
120 | if (err != 0) | |
121 | return 1; | |
122 | ||
123 | if (data.wVersion < version) | |
124 | return 2; | |
125 | ||
126 | if (initialized_sockets_version == 0) | |
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127 | register_fd_hook (close_fd_maybe_socket, ioctl_fd_maybe_socket, |
128 | &fd_sockets_hook); | |
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129 | |
130 | initialized_sockets_version = version; | |
131 | } | |
132 | #endif | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | int | |
138 | gl_sockets_cleanup (void) | |
139 | { | |
140 | #if WINDOWS_SOCKETS | |
141 | int err; | |
142 | ||
143 | initialized_sockets_version = 0; | |
144 | ||
dd7d0148 | 145 | unregister_fd_hook (&fd_sockets_hook); |
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146 | |
147 | err = WSACleanup (); | |
148 | if (err != 0) | |
149 | return 1; | |
150 | #endif | |
151 | ||
152 | return 0; | |
153 | } |