diff options
Diffstat (limited to 'chardev/char-stdio.c')
| -rw-r--r-- | chardev/char-stdio.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/chardev/char-stdio.c b/chardev/char-stdio.c new file mode 100644 index 0000000000..be4a65962c --- /dev/null +++ b/chardev/char-stdio.c @@ -0,0 +1,164 @@ +/* + * 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/sockets.h" +#include "qapi/error.h" +#include "qemu-common.h" +#include "sysemu/char.h" + +#ifdef _WIN32 +#include "char-win.h" +#include "char-win-stdio.h" +#else +#include <termios.h> +#include "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) +{ + 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); + qemu_set_nonblock(0); + 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); + + if (opts->has_signal) { + stdio_allow_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); |