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 #include "qemu/osdep.h" 25 #include "qemu/sockets.h" 26 #include "qapi/error.h" 27 #include "qemu-common.h" 28 #include "sysemu/char.h" 29 30 #ifdef _WIN32 31 #include "char-win.h" 32 #include "char-win-stdio.h" 33 #else 34 #include <termios.h> 35 #include "char-fd.h" 36 #endif 37 38 #ifndef _WIN32 39 /* init terminal so that we can grab keys */ 40 static struct termios oldtty; 41 static int old_fd0_flags; 42 static bool stdio_in_use; 43 static bool stdio_allow_signal; 44 static bool stdio_echo_state; 45 46 static void term_exit(void) 47 { 48 tcsetattr(0, TCSANOW, &oldtty); 49 fcntl(0, F_SETFL, old_fd0_flags); 50 } 51 52 static void qemu_chr_set_echo_stdio(Chardev *chr, bool echo) 53 { 54 struct termios tty; 55 56 stdio_echo_state = echo; 57 tty = oldtty; 58 if (!echo) { 59 tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP 60 | INLCR | IGNCR | ICRNL | IXON); 61 tty.c_oflag |= OPOST; 62 tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN); 63 tty.c_cflag &= ~(CSIZE | PARENB); 64 tty.c_cflag |= CS8; 65 tty.c_cc[VMIN] = 1; 66 tty.c_cc[VTIME] = 0; 67 } 68 if (!stdio_allow_signal) { 69 tty.c_lflag &= ~ISIG; 70 } 71 72 tcsetattr(0, TCSANOW, &tty); 73 } 74 75 static void term_stdio_handler(int sig) 76 { 77 /* restore echo after resume from suspend. */ 78 qemu_chr_set_echo_stdio(NULL, stdio_echo_state); 79 } 80 81 static void qemu_chr_open_stdio(Chardev *chr, 82 ChardevBackend *backend, 83 bool *be_opened, 84 Error **errp) 85 { 86 ChardevStdio *opts = backend->u.stdio.data; 87 struct sigaction act; 88 89 if (is_daemonized()) { 90 error_setg(errp, "cannot use stdio with -daemonize"); 91 return; 92 } 93 94 if (stdio_in_use) { 95 error_setg(errp, "cannot use stdio by multiple character devices"); 96 return; 97 } 98 99 stdio_in_use = true; 100 old_fd0_flags = fcntl(0, F_GETFL); 101 tcgetattr(0, &oldtty); 102 qemu_set_nonblock(0); 103 atexit(term_exit); 104 105 memset(&act, 0, sizeof(act)); 106 act.sa_handler = term_stdio_handler; 107 sigaction(SIGCONT, &act, NULL); 108 109 qemu_chr_open_fd(chr, 0, 1); 110 111 if (opts->has_signal) { 112 stdio_allow_signal = opts->signal; 113 } 114 qemu_chr_set_echo_stdio(chr, false); 115 } 116 #endif 117 118 static void qemu_chr_parse_stdio(QemuOpts *opts, ChardevBackend *backend, 119 Error **errp) 120 { 121 ChardevStdio *stdio; 122 123 backend->type = CHARDEV_BACKEND_KIND_STDIO; 124 stdio = backend->u.stdio.data = g_new0(ChardevStdio, 1); 125 qemu_chr_parse_common(opts, qapi_ChardevStdio_base(stdio)); 126 stdio->has_signal = true; 127 stdio->signal = qemu_opt_get_bool(opts, "signal", true); 128 } 129 130 static void char_stdio_class_init(ObjectClass *oc, void *data) 131 { 132 ChardevClass *cc = CHARDEV_CLASS(oc); 133 134 cc->parse = qemu_chr_parse_stdio; 135 #ifndef _WIN32 136 cc->open = qemu_chr_open_stdio; 137 cc->chr_set_echo = qemu_chr_set_echo_stdio; 138 #endif 139 } 140 141 static void char_stdio_finalize(Object *obj) 142 { 143 #ifndef _WIN32 144 term_exit(); 145 #endif 146 } 147 148 static const TypeInfo char_stdio_type_info = { 149 .name = TYPE_CHARDEV_STDIO, 150 #ifdef _WIN32 151 .parent = TYPE_CHARDEV_WIN_STDIO, 152 #else 153 .parent = TYPE_CHARDEV_FD, 154 #endif 155 .instance_finalize = char_stdio_finalize, 156 .class_init = char_stdio_class_init, 157 }; 158 159 static void register_types(void) 160 { 161 type_register_static(&char_stdio_type_info); 162 } 163 164 type_init(register_types); 165