1 /* Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License, version 2.0,
5 as published by the Free Software Foundation.
6
7 This program is also distributed with certain software (including
8 but not limited to OpenSSL) that is licensed under separate terms,
9 as designated in a particular file or component or in included license
10 documentation. The authors of MySQL hereby grant you an additional
11 permission to link the program and your derivative works with the
12 separately licensed software that they have included with MySQL.
13
14 Without limiting anything contained in the foregoing, this file,
15 which is part of C Driver for MySQL (Connector/C), is also subject to the
16 Universal FOSS Exception, version 1.0, a copy of which can be found at
17 http://oss.oracle.com/licenses/universal-foss-exception.
18
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License, version 2.0, for more details.
23
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
27
28 #include "vio_priv.h"
29
30 #ifdef _WIN32
31
wait_overlapped_result(Vio * vio,int timeout)32 static size_t wait_overlapped_result(Vio *vio, int timeout)
33 {
34 size_t ret= (size_t) -1;
35 DWORD transferred, wait_status, timeout_ms;
36
37 timeout_ms= timeout >= 0 ? timeout : INFINITE;
38
39 /* Wait for the overlapped operation to be completed. */
40 wait_status= WaitForSingleObject(vio->overlapped.hEvent, timeout_ms);
41
42 /* The operation might have completed, attempt to retrieve the result. */
43 if (wait_status == WAIT_OBJECT_0)
44 {
45 /* If retrieval fails, a error code will have been set. */
46 if (GetOverlappedResult(vio->hPipe, &vio->overlapped, &transferred, FALSE))
47 ret= transferred;
48 }
49 else
50 {
51 /* Error or timeout, cancel the pending I/O operation. */
52 CancelIo(vio->hPipe);
53
54 /*
55 If the wait timed out, set error code to indicate a
56 timeout error. Otherwise, wait_status is WAIT_FAILED
57 and extended error information was already set.
58 */
59 if (wait_status == WAIT_TIMEOUT)
60 SetLastError(SOCKET_ETIMEDOUT);
61 }
62
63 return ret;
64 }
65
66
vio_read_pipe(Vio * vio,uchar * buf,size_t count)67 size_t vio_read_pipe(Vio *vio, uchar *buf, size_t count)
68 {
69 DWORD transferred;
70 size_t ret= (size_t) -1;
71 DBUG_ENTER("vio_read_pipe");
72
73 /* Attempt to read from the pipe (overlapped I/O). */
74 if (ReadFile(vio->hPipe, buf, count, &transferred, &vio->overlapped))
75 {
76 /* The operation completed immediately. */
77 ret= transferred;
78 }
79 /* Read operation is pending completion asynchronously? */
80 else if (GetLastError() == ERROR_IO_PENDING)
81 ret= wait_overlapped_result(vio, vio->read_timeout);
82
83 DBUG_RETURN(ret);
84 }
85
86
vio_write_pipe(Vio * vio,const uchar * buf,size_t count)87 size_t vio_write_pipe(Vio *vio, const uchar *buf, size_t count)
88 {
89 DWORD transferred;
90 size_t ret= (size_t) -1;
91 DBUG_ENTER("vio_write_pipe");
92
93 /* Attempt to write to the pipe (overlapped I/O). */
94 if (WriteFile(vio->hPipe, buf, count, &transferred, &vio->overlapped))
95 {
96 /* The operation completed immediately. */
97 ret= transferred;
98 }
99 /* Write operation is pending completion asynchronously? */
100 else if (GetLastError() == ERROR_IO_PENDING)
101 ret= wait_overlapped_result(vio, vio->write_timeout);
102
103 DBUG_RETURN(ret);
104 }
105
106
vio_is_connected_pipe(Vio * vio)107 my_bool vio_is_connected_pipe(Vio *vio)
108 {
109 if (PeekNamedPipe(vio->hPipe, NULL, 0, NULL, NULL, NULL))
110 return TRUE;
111 else
112 return (GetLastError() != ERROR_BROKEN_PIPE);
113 }
114
115
vio_shutdown_pipe(Vio * vio)116 int vio_shutdown_pipe(Vio *vio)
117 {
118 BOOL ret= FALSE;
119 DBUG_ENTER("vio_shutdown_pipe");
120
121 if (vio->inactive == FALSE)
122 {
123 CancelIo(vio->hPipe);
124 CloseHandle(vio->overlapped.hEvent);
125 DisconnectNamedPipe(vio->hPipe);
126 ret= CloseHandle(vio->hPipe);
127 }
128 vio->inactive= TRUE;
129 vio->hPipe= NULL;
130 vio->mysql_socket= MYSQL_INVALID_SOCKET;
131
132 DBUG_RETURN(ret);
133 }
134
135 #endif
136
137