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