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 int old_fd1_flags; 45 static bool stdio_in_use; 46 static bool stdio_allow_signal; 47 static bool stdio_echo_state; 48 49 static void term_exit(void) 50 { 51 if (stdio_in_use) { 52 tcsetattr(0, TCSANOW, &oldtty); 53 fcntl(0, F_SETFL, old_fd0_flags); 54 fcntl(1, F_SETFL, old_fd1_flags); 55 stdio_in_use = false; 56 } 57 } 58 59 static void qemu_chr_set_echo_stdio(Chardev *chr, bool echo) 60 { 61 struct termios tty; 62 63 stdio_echo_state = echo; 64 tty = oldtty; 65 if (!echo) { 66 tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP 67 | INLCR | IGNCR | ICRNL | IXON); 68 tty.c_oflag |= OPOST; 69 tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN); 70 tty.c_cflag &= ~(CSIZE | PARENB); 71 tty.c_cflag |= CS8; 72 tty.c_cc[VMIN] = 1; 73 tty.c_cc[VTIME] = 0; 74 } 75 if (!stdio_allow_signal) { 76 tty.c_lflag &= ~ISIG; 77 } 78 79 tcsetattr(0, TCSANOW, &tty); 80 } 81 82 static void term_stdio_handler(int sig) 83 { 84 /* restore echo after resume from suspend. */ 85 qemu_chr_set_echo_stdio(NULL, stdio_echo_state); 86 } 87 88 static void qemu_chr_open_stdio(Chardev *chr, 89 ChardevBackend *backend, 90 bool *be_opened, 91 Error **errp) 92 { 93 ChardevStdio *opts = backend->u.stdio.data; 94 struct sigaction act; 95 96 if (is_daemonized()) { 97 error_setg(errp, "cannot use stdio with -daemonize"); 98 return; 99 } 100 101 if (stdio_in_use) { 102 error_setg(errp, "cannot use stdio by multiple character devices"); 103 return; 104 } 105 106 stdio_in_use = true; 107 old_fd0_flags = fcntl(0, F_GETFL); 108 old_fd1_flags = fcntl(1, F_GETFL); 109 tcgetattr(0, &oldtty); 110 if (!g_unix_set_fd_nonblocking(0, true, NULL)) { 111 error_setg_errno(errp, errno, "Failed to set FD nonblocking"); 112 return; 113 } 114 atexit(term_exit); 115 116 memset(&act, 0, sizeof(act)); 117 act.sa_handler = term_stdio_handler; 118 sigaction(SIGCONT, &act, NULL); 119 120 qemu_chr_open_fd(chr, 0, 1); 121 122 stdio_allow_signal = !opts->has_signal || opts->signal; 123 qemu_chr_set_echo_stdio(chr, false); 124 } 125 #endif 126 127 static void qemu_chr_parse_stdio(QemuOpts *opts, ChardevBackend *backend, 128 Error **errp) 129 { 130 ChardevStdio *stdio; 131 132 backend->type = CHARDEV_BACKEND_KIND_STDIO; 133 stdio = backend->u.stdio.data = g_new0(ChardevStdio, 1); 134 qemu_chr_parse_common(opts, qapi_ChardevStdio_base(stdio)); 135 stdio->has_signal = true; 136 stdio->signal = qemu_opt_get_bool(opts, "signal", true); 137 } 138 139 static void char_stdio_class_init(ObjectClass *oc, void *data) 140 { 141 ChardevClass *cc = CHARDEV_CLASS(oc); 142 143 cc->parse = qemu_chr_parse_stdio; 144 #ifndef _WIN32 145 cc->open = qemu_chr_open_stdio; 146 cc->chr_set_echo = qemu_chr_set_echo_stdio; 147 #endif 148 } 149 150 static void char_stdio_finalize(Object *obj) 151 { 152 #ifndef _WIN32 153 term_exit(); 154 #endif 155 } 156 157 static const TypeInfo char_stdio_type_info = { 158 .name = TYPE_CHARDEV_STDIO, 159 #ifdef _WIN32 160 .parent = TYPE_CHARDEV_WIN_STDIO, 161 #else 162 .parent = TYPE_CHARDEV_FD, 163 #endif 164 .instance_finalize = char_stdio_finalize, 165 .class_init = char_stdio_class_init, 166 }; 167 168 static void register_types(void) 169 { 170 type_register_static(&char_stdio_type_info); 171 } 172 173 type_init(register_types); 174