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); 167