qemu

char-stdio.c (4709B)

---

 /*
  * QEMU System Emulator
  *
  * Copyright (c) 2003-2008 Fabrice Bellard
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 
 #include "qemu/osdep.h"
 #include "qemu/module.h"
 #include "qemu/option.h"
 #include "qemu/sockets.h"
 #include "qapi/error.h"
 #include "chardev/char.h"
 
 #ifdef _WIN32
 #include "chardev/char-win.h"
 #include "chardev/char-win-stdio.h"
 #else
 #include <termios.h>
 #include "chardev/char-fd.h"
 #endif
 
 #ifndef _WIN32
 /* init terminal so that we can grab keys */
 static struct termios oldtty;
 static int old_fd0_flags;
 static bool stdio_in_use;
 static bool stdio_allow_signal;
 static bool stdio_echo_state;
 
 static void term_exit(void)
 {
     if (stdio_in_use) {
         tcsetattr(0, TCSANOW, &oldtty);
         fcntl(0, F_SETFL, old_fd0_flags);
     }
 }
 
 static void qemu_chr_set_echo_stdio(Chardev *chr, bool echo)
 {
     struct termios tty;
 
     stdio_echo_state = echo;
     tty = oldtty;
     if (!echo) {
         tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
                          | INLCR | IGNCR | ICRNL | IXON);
         tty.c_oflag |= OPOST;
         tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN);
         tty.c_cflag &= ~(CSIZE | PARENB);
         tty.c_cflag |= CS8;
         tty.c_cc[VMIN] = 1;
         tty.c_cc[VTIME] = 0;
     }
     if (!stdio_allow_signal) {
         tty.c_lflag &= ~ISIG;
     }
 
     tcsetattr(0, TCSANOW, &tty);
 }
 
 static void term_stdio_handler(int sig)
 {
     /* restore echo after resume from suspend. */
     qemu_chr_set_echo_stdio(NULL, stdio_echo_state);
 }
 
 static void qemu_chr_open_stdio(Chardev *chr,
                                 ChardevBackend *backend,
                                 bool *be_opened,
                                 Error **errp)
 {
     ChardevStdio *opts = backend->u.stdio.data;
     struct sigaction act;
 
     if (is_daemonized()) {
         error_setg(errp, "cannot use stdio with -daemonize");
         return;
     }
 
     if (stdio_in_use) {
         error_setg(errp, "cannot use stdio by multiple character devices");
         return;
     }
 
     stdio_in_use = true;
     old_fd0_flags = fcntl(0, F_GETFL);
     tcgetattr(0, &oldtty);
     if (!g_unix_set_fd_nonblocking(0, true, NULL)) {
         error_setg_errno(errp, errno, "Failed to set FD nonblocking");
         return;
     }
     atexit(term_exit);
 
     memset(&act, 0, sizeof(act));
     act.sa_handler = term_stdio_handler;
     sigaction(SIGCONT, &act, NULL);
 
     qemu_chr_open_fd(chr, 0, 1);
 
     stdio_allow_signal = !opts->has_signal || opts->signal;
     qemu_chr_set_echo_stdio(chr, false);
 }
 #endif
 
 static void qemu_chr_parse_stdio(QemuOpts *opts, ChardevBackend *backend,
                                  Error **errp)
 {
     ChardevStdio *stdio;
 
     backend->type = CHARDEV_BACKEND_KIND_STDIO;
     stdio = backend->u.stdio.data = g_new0(ChardevStdio, 1);
     qemu_chr_parse_common(opts, qapi_ChardevStdio_base(stdio));
     stdio->has_signal = true;
     stdio->signal = qemu_opt_get_bool(opts, "signal", true);
 }
 
 static void char_stdio_class_init(ObjectClass *oc, void *data)
 {
     ChardevClass *cc = CHARDEV_CLASS(oc);
 
     cc->parse = qemu_chr_parse_stdio;
 #ifndef _WIN32
     cc->open = qemu_chr_open_stdio;
     cc->chr_set_echo = qemu_chr_set_echo_stdio;
 #endif
 }
 
 static void char_stdio_finalize(Object *obj)
 {
 #ifndef _WIN32
     term_exit();
 #endif
 }
 
 static const TypeInfo char_stdio_type_info = {
     .name = TYPE_CHARDEV_STDIO,
 #ifdef _WIN32
     .parent = TYPE_CHARDEV_WIN_STDIO,
 #else
     .parent = TYPE_CHARDEV_FD,
 #endif
     .instance_finalize = char_stdio_finalize,
     .class_init = char_stdio_class_init,
 };
 
 static void register_types(void)
 {
     type_register_static(&char_stdio_type_info);
 }
 
 type_init(register_types);