Merge remote-tracking branch 'remotes/vivier2/tags/trivial-branch-for-6.2-pull-reques...
[qemu.git] / chardev / char-stdio.c
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 stdio_allow_signal = !opts->has_signal || opts->signal;
116 qemu_chr_set_echo_stdio(chr, false);
117 }
118 #endif
119
120 static void qemu_chr_parse_stdio(QemuOpts *opts, ChardevBackend *backend,
121 Error **errp)
122 {
123 ChardevStdio *stdio;
124
125 backend->type = CHARDEV_BACKEND_KIND_STDIO;
126 stdio = backend->u.stdio.data = g_new0(ChardevStdio, 1);
127 qemu_chr_parse_common(opts, qapi_ChardevStdio_base(stdio));
128 stdio->has_signal = true;
129 stdio->signal = qemu_opt_get_bool(opts, "signal", true);
130 }
131
132 static void char_stdio_class_init(ObjectClass *oc, void *data)
133 {
134 ChardevClass *cc = CHARDEV_CLASS(oc);
135
136 cc->parse = qemu_chr_parse_stdio;
137 #ifndef _WIN32
138 cc->open = qemu_chr_open_stdio;
139 cc->chr_set_echo = qemu_chr_set_echo_stdio;
140 #endif
141 }
142
143 static void char_stdio_finalize(Object *obj)
144 {
145 #ifndef _WIN32
146 term_exit();
147 #endif
148 }
149
150 static const TypeInfo char_stdio_type_info = {
151 .name = TYPE_CHARDEV_STDIO,
152 #ifdef _WIN32
153 .parent = TYPE_CHARDEV_WIN_STDIO,
154 #else
155 .parent = TYPE_CHARDEV_FD,
156 #endif
157 .instance_finalize = char_stdio_finalize,
158 .class_init = char_stdio_class_init,
159 };
160
161 static void register_types(void)
162 {
163 type_register_static(&char_stdio_type_info);
164 }
165
166 type_init(register_types);