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 "qemu/module.h" |
27 | #include "qemu/option.h" |
28 | #include "qemu/sockets.h" |
29 | #include "qapi/error.h" |
30 | #include "chardev/char.h" |
31 | |
32 | #ifdef _WIN32 |
33 | #include "chardev/char-win.h" |
34 | #include "chardev/char-win-stdio.h" |
35 | #else |
36 | #include <termios.h> |
37 | #include "chardev/char-fd.h" |
38 | #endif |
39 | |
40 | #ifndef _WIN32 |
41 | /* init terminal so that we can grab keys */ |
42 | static struct termios oldtty; |
43 | static int old_fd0_flags; |
44 | static bool stdio_in_use; |
45 | static bool stdio_allow_signal; |
46 | static bool stdio_echo_state; |
47 | |
48 | static void term_exit(void) |
49 | { |
50 | if (stdio_in_use) { |
51 | tcsetattr(0, TCSANOW, &oldtty); |
52 | fcntl(0, F_SETFL, old_fd0_flags); |
53 | } |
54 | } |
55 | |
56 | static void qemu_chr_set_echo_stdio(Chardev *chr, bool echo) |
57 | { |
58 | struct termios tty; |
59 | |
60 | stdio_echo_state = echo; |
61 | tty = oldtty; |
62 | if (!echo) { |
63 | tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP |
64 | | INLCR | IGNCR | ICRNL | IXON); |
65 | tty.c_oflag |= OPOST; |
66 | tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN); |
67 | tty.c_cflag &= ~(CSIZE | PARENB); |
68 | tty.c_cflag |= CS8; |
69 | tty.c_cc[VMIN] = 1; |
70 | tty.c_cc[VTIME] = 0; |
71 | } |
72 | if (!stdio_allow_signal) { |
73 | tty.c_lflag &= ~ISIG; |
74 | } |
75 | |
76 | tcsetattr(0, TCSANOW, &tty); |
77 | } |
78 | |
79 | static void term_stdio_handler(int sig) |
80 | { |
81 | /* restore echo after resume from suspend. */ |
82 | qemu_chr_set_echo_stdio(NULL, stdio_echo_state); |
83 | } |
84 | |
85 | static void qemu_chr_open_stdio(Chardev *chr, |
86 | ChardevBackend *backend, |
87 | bool *be_opened, |
88 | Error **errp) |
89 | { |
90 | ChardevStdio *opts = backend->u.stdio.data; |
91 | struct sigaction act; |
92 | |
93 | if (is_daemonized()) { |
94 | error_setg(errp, "cannot use stdio with -daemonize" ); |
95 | return; |
96 | } |
97 | |
98 | if (stdio_in_use) { |
99 | error_setg(errp, "cannot use stdio by multiple character devices" ); |
100 | return; |
101 | } |
102 | |
103 | stdio_in_use = true; |
104 | old_fd0_flags = fcntl(0, F_GETFL); |
105 | tcgetattr(0, &oldtty); |
106 | qemu_set_nonblock(0); |
107 | atexit(term_exit); |
108 | |
109 | memset(&act, 0, sizeof(act)); |
110 | act.sa_handler = term_stdio_handler; |
111 | sigaction(SIGCONT, &act, NULL); |
112 | |
113 | qemu_chr_open_fd(chr, 0, 1); |
114 | |
115 | if (opts->has_signal) { |
116 | stdio_allow_signal = opts->signal; |
117 | } |
118 | qemu_chr_set_echo_stdio(chr, false); |
119 | } |
120 | #endif |
121 | |
122 | static void qemu_chr_parse_stdio(QemuOpts *opts, ChardevBackend *backend, |
123 | Error **errp) |
124 | { |
125 | ChardevStdio *stdio; |
126 | |
127 | backend->type = CHARDEV_BACKEND_KIND_STDIO; |
128 | stdio = backend->u.stdio.data = g_new0(ChardevStdio, 1); |
129 | qemu_chr_parse_common(opts, qapi_ChardevStdio_base(stdio)); |
130 | stdio->has_signal = true; |
131 | stdio->signal = qemu_opt_get_bool(opts, "signal" , true); |
132 | } |
133 | |
134 | static void char_stdio_class_init(ObjectClass *oc, void *data) |
135 | { |
136 | ChardevClass *cc = CHARDEV_CLASS(oc); |
137 | |
138 | cc->parse = qemu_chr_parse_stdio; |
139 | #ifndef _WIN32 |
140 | cc->open = qemu_chr_open_stdio; |
141 | cc->chr_set_echo = qemu_chr_set_echo_stdio; |
142 | #endif |
143 | } |
144 | |
145 | static void char_stdio_finalize(Object *obj) |
146 | { |
147 | #ifndef _WIN32 |
148 | term_exit(); |
149 | #endif |
150 | } |
151 | |
152 | static const TypeInfo char_stdio_type_info = { |
153 | .name = TYPE_CHARDEV_STDIO, |
154 | #ifdef _WIN32 |
155 | .parent = TYPE_CHARDEV_WIN_STDIO, |
156 | #else |
157 | .parent = TYPE_CHARDEV_FD, |
158 | #endif |
159 | .instance_finalize = char_stdio_finalize, |
160 | .class_init = char_stdio_class_init, |
161 | }; |
162 | |
163 | static void register_types(void) |
164 | { |
165 | type_register_static(&char_stdio_type_info); |
166 | } |
167 | |
168 | type_init(register_types); |
169 | |