xref: /openbmc/qemu/chardev/char-win-stdio.c (revision e818c01a) 
1 /*
2  * QEMU System Emulator
3  *
4  * Copyright (c) 2003-2008 Fabrice Bellard
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 
25 #include "qemu/osdep.h"
26 #include "qapi/error.h"
27 #include "qemu/main-loop.h"
28 #include "qemu/module.h"
29 #include "chardev/char-win.h"
30 #include "chardev/char-win-stdio.h"
31 #include "qom/object.h"
32 
33 struct WinStdioChardev {
34     Chardev parent;
35     HANDLE  hStdIn;
36     DWORD   dwOldMode;
37     HANDLE  hInputReadyEvent;
38     HANDLE  hInputDoneEvent;
39     HANDLE  hInputThread;
40     uint8_t win_stdio_buf;
41 };
42 typedef struct WinStdioChardev WinStdioChardev;
43 
44 DECLARE_INSTANCE_CHECKER(WinStdioChardev, WIN_STDIO_CHARDEV,
45                          TYPE_CHARDEV_WIN_STDIO)
46 
47 static void win_stdio_wait_func(void *opaque)
48 {
49     Chardev *chr = CHARDEV(opaque);
50     WinStdioChardev *stdio = WIN_STDIO_CHARDEV(opaque);
51     INPUT_RECORD       buf[4];
52     int                ret;
53     DWORD              dwSize;
54     int                i;
55 
56     ret = ReadConsoleInput(stdio->hStdIn, buf, ARRAY_SIZE(buf), &dwSize);
57 
58     if (!ret) {
59         /* Avoid error storm */
60         qemu_del_wait_object(stdio->hStdIn, NULL, NULL);
61         return;
62     }
63 
64     for (i = 0; i < dwSize; i++) {
65         KEY_EVENT_RECORD *kev = &buf[i].Event.KeyEvent;
66 
67         if (buf[i].EventType == KEY_EVENT && kev->bKeyDown) {
68             int j;
69             if (kev->uChar.AsciiChar != 0) {
70                 for (j = 0; j < kev->wRepeatCount; j++) {
71                     if (qemu_chr_be_can_write(chr)) {
72                         uint8_t c = kev->uChar.AsciiChar;
73                         qemu_chr_be_write(chr, &c, 1);
74                     }
75                 }
76             }
77         }
78     }
79 }
80 
81 static DWORD WINAPI win_stdio_thread(LPVOID param)
82 {
83     WinStdioChardev *stdio = WIN_STDIO_CHARDEV(param);
84     int                ret;
85     DWORD              dwSize;
86 
87     while (1) {
88 
89         /* Wait for one byte */
90         ret = ReadFile(stdio->hStdIn, &stdio->win_stdio_buf, 1, &dwSize, NULL);
91 
92         /* Exit in case of error, continue if nothing read */
93         if (!ret) {
94             break;
95         }
96         if (!dwSize) {
97             continue;
98         }
99 
100         /* Some terminal emulator returns \r\n for Enter, just pass \n */
101         if (stdio->win_stdio_buf == '\r') {
102             continue;
103         }
104 
105         /* Signal the main thread and wait until the byte was eaten */
106         if (!SetEvent(stdio->hInputReadyEvent)) {
107             break;
108         }
109         if (WaitForSingleObject(stdio->hInputDoneEvent, INFINITE)
110             != WAIT_OBJECT_0) {
111             break;
112         }
113     }
114 
115     qemu_del_wait_object(stdio->hInputReadyEvent, NULL, NULL);
116     return 0;
117 }
118 
119 static void win_stdio_thread_wait_func(void *opaque)
120 {
121     Chardev *chr = CHARDEV(opaque);
122     WinStdioChardev *stdio = WIN_STDIO_CHARDEV(opaque);
123 
124     if (qemu_chr_be_can_write(chr)) {
125         qemu_chr_be_write(chr, &stdio->win_stdio_buf, 1);
126     }
127 
128     SetEvent(stdio->hInputDoneEvent);
129 }
130 
131 static void qemu_chr_set_echo_win_stdio(Chardev *chr, bool echo)
132 {
133     WinStdioChardev *stdio = WIN_STDIO_CHARDEV(chr);
134     DWORD              dwMode = 0;
135 
136     GetConsoleMode(stdio->hStdIn, &dwMode);
137 
138     if (echo) {
139         SetConsoleMode(stdio->hStdIn, dwMode | ENABLE_ECHO_INPUT);
140     } else {
141         SetConsoleMode(stdio->hStdIn, dwMode & ~ENABLE_ECHO_INPUT);
142     }
143 }
144 
145 static void qemu_chr_open_stdio(Chardev *chr,
146                                 ChardevBackend *backend,
147                                 bool *be_opened,
148                                 Error **errp)
149 {
150     ChardevStdio *opts = backend->u.stdio.data;
151     bool stdio_allow_signal = !opts->has_signal || opts->signal;
152     WinStdioChardev *stdio = WIN_STDIO_CHARDEV(chr);
153     DWORD              dwMode;
154     int                is_console = 0;
155 
156     stdio->hStdIn = GetStdHandle(STD_INPUT_HANDLE);
157     if (stdio->hStdIn == INVALID_HANDLE_VALUE) {
158         error_setg(errp, "cannot open stdio: invalid handle");
159         return;
160     }
161 
162     is_console = GetConsoleMode(stdio->hStdIn, &dwMode) != 0;
163     stdio->dwOldMode = dwMode;
164 
165     if (is_console) {
166         if (qemu_add_wait_object(stdio->hStdIn,
167                                  win_stdio_wait_func, chr)) {
168             error_setg(errp, "qemu_add_wait_object: failed");
169             goto err1;
170         }
171     } else {
172         DWORD   dwId;
173 
174         stdio->hInputReadyEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
175         stdio->hInputDoneEvent  = CreateEvent(NULL, FALSE, FALSE, NULL);
176         if (stdio->hInputReadyEvent == INVALID_HANDLE_VALUE
177             || stdio->hInputDoneEvent == INVALID_HANDLE_VALUE) {
178             error_setg(errp, "cannot create event");
179             goto err2;
180         }
181         if (qemu_add_wait_object(stdio->hInputReadyEvent,
182                                  win_stdio_thread_wait_func, chr)) {
183             error_setg(errp, "qemu_add_wait_object: failed");
184             goto err2;
185         }
186         stdio->hInputThread     = CreateThread(NULL, 0, win_stdio_thread,
187                                                chr, 0, &dwId);
188 
189         if (stdio->hInputThread == INVALID_HANDLE_VALUE) {
190             error_setg(errp, "cannot create stdio thread");
191             goto err3;
192         }
193     }
194 
195     dwMode |= ENABLE_LINE_INPUT | ENABLE_VIRTUAL_TERMINAL_INPUT;
196 
197     if (is_console) {
198         /* set the terminal in raw mode */
199         /* ENABLE_QUICK_EDIT_MODE | ENABLE_EXTENDED_FLAGS */
200         if (stdio_allow_signal) {
201             dwMode |= ENABLE_PROCESSED_INPUT;
202         } else {
203             dwMode &= ~ENABLE_PROCESSED_INPUT;
204         }
205     }
206 
207     SetConsoleMode(stdio->hStdIn, dwMode);
208 
209     qemu_chr_set_echo_win_stdio(chr, false);
210 
211     return;
212 
213 err3:
214     qemu_del_wait_object(stdio->hInputReadyEvent, NULL, NULL);
215 err2:
216     CloseHandle(stdio->hInputReadyEvent);
217     CloseHandle(stdio->hInputDoneEvent);
218 err1:
219     qemu_del_wait_object(stdio->hStdIn, NULL, NULL);
220 }
221 
222 static void char_win_stdio_finalize(Object *obj)
223 {
224     WinStdioChardev *stdio = WIN_STDIO_CHARDEV(obj);
225 
226     if (stdio->hStdIn != INVALID_HANDLE_VALUE) {
227         SetConsoleMode(stdio->hStdIn, stdio->dwOldMode);
228     }
229     if (stdio->hInputReadyEvent != INVALID_HANDLE_VALUE) {
230         CloseHandle(stdio->hInputReadyEvent);
231     }
232     if (stdio->hInputDoneEvent != INVALID_HANDLE_VALUE) {
233         CloseHandle(stdio->hInputDoneEvent);
234     }
235     if (stdio->hInputThread != INVALID_HANDLE_VALUE) {
236         TerminateThread(stdio->hInputThread, 0);
237     }
238 }
239 
240 static int win_stdio_write(Chardev *chr, const uint8_t *buf, int len)
241 {
242     HANDLE  hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
243     DWORD   dwSize;
244     int     len1;
245 
246     len1 = len;
247 
248     while (len1 > 0) {
249         if (!WriteFile(hStdOut, buf, len1, &dwSize, NULL)) {
250             break;
251         }
252         buf  += dwSize;
253         len1 -= dwSize;
254     }
255 
256     return len - len1;
257 }
258 
259 static void char_win_stdio_class_init(ObjectClass *oc, void *data)
260 {
261     ChardevClass *cc = CHARDEV_CLASS(oc);
262 
263     cc->open = qemu_chr_open_stdio;
264     cc->chr_write = win_stdio_write;
265     cc->chr_set_echo = qemu_chr_set_echo_win_stdio;
266 }
267 
268 static const TypeInfo char_win_stdio_type_info = {
269     .name = TYPE_CHARDEV_WIN_STDIO,
270     .parent = TYPE_CHARDEV,
271     .instance_size = sizeof(WinStdioChardev),
272     .instance_finalize = char_win_stdio_finalize,
273     .class_init = char_win_stdio_class_init,
274     .abstract = true,
275 };
276 
277 static void register_types(void)
278 {
279     type_register_static(&char_win_stdio_type_info);
280 }
281 
282 type_init(register_types);
283