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1 | /* sockets.c --- wrappers for Windows socket functions |
2 | ||
3 | Copyright (C) 2008-2010 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 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 | ||
30 | # include "close-hook.h" | |
31 | ||
32 | /* Get set_winsock_errno, FD_TO_SOCKET etc. */ | |
33 | # include "w32sock.h" | |
34 | ||
35 | static int | |
36 | close_fd_maybe_socket (int fd, const struct close_hook *remaining_list) | |
37 | { | |
38 | SOCKET sock; | |
39 | WSANETWORKEVENTS ev; | |
40 | ||
41 | /* Test whether fd refers to a socket. */ | |
42 | sock = FD_TO_SOCKET (fd); | |
43 | ev.lNetworkEvents = 0xDEADBEEF; | |
44 | WSAEnumNetworkEvents (sock, NULL, &ev); | |
45 | if (ev.lNetworkEvents != 0xDEADBEEF) | |
46 | { | |
47 | /* fd refers to a socket. */ | |
48 | /* FIXME: other applications, like squid, use an undocumented | |
49 | _free_osfhnd free function. But this is not enough: The 'osfile' | |
50 | flags for fd also needs to be cleared, but it is hard to access it. | |
51 | Instead, here we just close twice the file descriptor. */ | |
52 | if (closesocket (sock)) | |
53 | { | |
54 | set_winsock_errno (); | |
55 | return -1; | |
56 | } | |
57 | else | |
58 | { | |
59 | /* This call frees the file descriptor and does a | |
60 | CloseHandle ((HANDLE) _get_osfhandle (fd)), which fails. */ | |
61 | _close (fd); | |
62 | return 0; | |
63 | } | |
64 | } | |
65 | else | |
66 | /* Some other type of file descriptor. */ | |
67 | return execute_close_hooks (fd, remaining_list); | |
68 | } | |
69 | ||
70 | static struct close_hook close_sockets_hook; | |
71 | ||
72 | static int initialized_sockets_version /* = 0 */; | |
73 | ||
74 | #endif /* WINDOWS_SOCKETS */ | |
75 | ||
76 | int | |
77 | gl_sockets_startup (int version _GL_UNUSED) | |
78 | { | |
79 | #if WINDOWS_SOCKETS | |
80 | if (version > initialized_sockets_version) | |
81 | { | |
82 | WSADATA data; | |
83 | int err; | |
84 | ||
85 | err = WSAStartup (version, &data); | |
86 | if (err != 0) | |
87 | return 1; | |
88 | ||
89 | if (data.wVersion < version) | |
90 | return 2; | |
91 | ||
92 | if (initialized_sockets_version == 0) | |
93 | register_close_hook (close_fd_maybe_socket, &close_sockets_hook); | |
94 | ||
95 | initialized_sockets_version = version; | |
96 | } | |
97 | #endif | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | int | |
103 | gl_sockets_cleanup (void) | |
104 | { | |
105 | #if WINDOWS_SOCKETS | |
106 | int err; | |
107 | ||
108 | initialized_sockets_version = 0; | |
109 | ||
110 | unregister_close_hook (&close_sockets_hook); | |
111 | ||
112 | err = WSACleanup (); | |
113 | if (err != 0) | |
114 | return 1; | |
115 | #endif | |
116 | ||
117 | return 0; | |
118 | } |