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qemu/chardev/char-serial.c
Daniel P. Berrangé 211ef6c4b6 chardev: ensure termios is fully initialized 
valgrind on the test-char.c code reports that 'struct termios' contains
uninitialized memory.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190211182442.8542-17-berrange@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2019-02-12 17:35:56 +01:00

327 lines
8.3 KiB
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/*
* 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/option.h"
#include "qemu/sockets.h"
#include "io/channel-file.h"
#include "qapi/error.h"
#ifdef _WIN32
#include "chardev/char-win.h"
#else
#include <sys/ioctl.h>
#include <termios.h>
#include "chardev/char-fd.h"
#endif
#include "chardev/char-serial.h"
#ifdef _WIN32
static void qmp_chardev_open_serial(Chardev *chr,
ChardevBackend *backend,
bool *be_opened,
Error **errp)
{
ChardevHostdev *serial = backend->u.serial.data;
win_chr_serial_init(chr, serial->device, errp);
}
#elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \
|| defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \
|| defined(__GLIBC__)
static void tty_serial_init(int fd, int speed,
int parity, int data_bits, int stop_bits)
{
struct termios tty = {0};
speed_t spd;
#if 0
printf("tty_serial_init: speed=%d parity=%c data=%d stop=%d\n",
speed, parity, data_bits, stop_bits);
#endif
tcgetattr(fd, &tty);
#define check_speed(val) \
if (speed <= val) { \
spd = B##val; \
goto done; \
}
speed = speed * 10 / 11;
check_speed(50);
check_speed(75);
check_speed(110);
check_speed(134);
check_speed(150);
check_speed(200);
check_speed(300);
check_speed(600);
check_speed(1200);
check_speed(1800);
check_speed(2400);
check_speed(4800);
check_speed(9600);
check_speed(19200);
check_speed(38400);
/* Non-Posix values follow. They may be unsupported on some systems. */
check_speed(57600);
check_speed(115200);
#ifdef B230400
check_speed(230400);
#endif
#ifdef B460800
check_speed(460800);
#endif
#ifdef B500000
check_speed(500000);
#endif
#ifdef B576000
check_speed(576000);
#endif
#ifdef B921600
check_speed(921600);
#endif
#ifdef B1000000
check_speed(1000000);
#endif
#ifdef B1152000
check_speed(1152000);
#endif
#ifdef B1500000
check_speed(1500000);
#endif
#ifdef B2000000
check_speed(2000000);
#endif
#ifdef B2500000
check_speed(2500000);
#endif
#ifdef B3000000
check_speed(3000000);
#endif
#ifdef B3500000
check_speed(3500000);
#endif
#ifdef B4000000
check_speed(4000000);
#endif
spd = B115200;
#undef check_speed
done:
cfsetispeed(&tty, spd);
cfsetospeed(&tty, spd);
tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
| INLCR | IGNCR | ICRNL | IXON);
tty.c_oflag &= ~OPOST;
tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG);
tty.c_cflag &= ~(CSIZE | PARENB | PARODD | CRTSCTS | CSTOPB);
switch (data_bits) {
default:
case 8:
tty.c_cflag |= CS8;
break;
case 7:
tty.c_cflag |= CS7;
break;
case 6:
tty.c_cflag |= CS6;
break;
case 5:
tty.c_cflag |= CS5;
break;
}
switch (parity) {
default:
case 'N':
break;
case 'E':
tty.c_cflag |= PARENB;
break;
case 'O':
tty.c_cflag |= PARENB | PARODD;
break;
}
if (stop_bits == 2) {
tty.c_cflag |= CSTOPB;
}
tcsetattr(fd, TCSANOW, &tty);
}
static int tty_serial_ioctl(Chardev *chr, int cmd, void *arg)
{
FDChardev *s = FD_CHARDEV(chr);
QIOChannelFile *fioc = QIO_CHANNEL_FILE(s->ioc_in);
switch (cmd) {
case CHR_IOCTL_SERIAL_SET_PARAMS:
{
QEMUSerialSetParams *ssp = arg;
tty_serial_init(fioc->fd,
ssp->speed, ssp->parity,
ssp->data_bits, ssp->stop_bits);
}
break;
case CHR_IOCTL_SERIAL_SET_BREAK:
{
int enable = *(int *)arg;
if (enable) {
tcsendbreak(fioc->fd, 1);
}
}
break;
case CHR_IOCTL_SERIAL_GET_TIOCM:
{
int sarg = 0;
int *targ = (int *)arg;
ioctl(fioc->fd, TIOCMGET, &sarg);
*targ = 0;
if (sarg & TIOCM_CTS) {
*targ |= CHR_TIOCM_CTS;
}
if (sarg & TIOCM_CAR) {
*targ |= CHR_TIOCM_CAR;
}
if (sarg & TIOCM_DSR) {
*targ |= CHR_TIOCM_DSR;
}
if (sarg & TIOCM_RI) {
*targ |= CHR_TIOCM_RI;
}
if (sarg & TIOCM_DTR) {
*targ |= CHR_TIOCM_DTR;
}
if (sarg & TIOCM_RTS) {
*targ |= CHR_TIOCM_RTS;
}
}
break;
case CHR_IOCTL_SERIAL_SET_TIOCM:
{
int sarg = *(int *)arg;
int targ = 0;
ioctl(fioc->fd, TIOCMGET, &targ);
targ &= ~(CHR_TIOCM_CTS | CHR_TIOCM_CAR | CHR_TIOCM_DSR
| CHR_TIOCM_RI | CHR_TIOCM_DTR | CHR_TIOCM_RTS);
if (sarg & CHR_TIOCM_CTS) {
targ |= TIOCM_CTS;
}
if (sarg & CHR_TIOCM_CAR) {
targ |= TIOCM_CAR;
}
if (sarg & CHR_TIOCM_DSR) {
targ |= TIOCM_DSR;
}
if (sarg & CHR_TIOCM_RI) {
targ |= TIOCM_RI;
}
if (sarg & CHR_TIOCM_DTR) {
targ |= TIOCM_DTR;
}
if (sarg & CHR_TIOCM_RTS) {
targ |= TIOCM_RTS;
}
ioctl(fioc->fd, TIOCMSET, &targ);
}
break;
default:
return -ENOTSUP;
}
return 0;
}
static void qmp_chardev_open_serial(Chardev *chr,
ChardevBackend *backend,
bool *be_opened,
Error **errp)
{
ChardevHostdev *serial = backend->u.serial.data;
int fd;
fd = qmp_chardev_open_file_source(serial->device, O_RDWR | O_NONBLOCK,
errp);
if (fd < 0) {
return;
}
qemu_set_nonblock(fd);
tty_serial_init(fd, 115200, 'N', 8, 1);
qemu_chr_open_fd(chr, fd, fd);
}
#endif /* __linux__ || __sun__ */
#ifdef HAVE_CHARDEV_SERIAL
static void qemu_chr_parse_serial(QemuOpts *opts, ChardevBackend *backend,
Error **errp)
{
const char *device = qemu_opt_get(opts, "path");
ChardevHostdev *serial;
if (device == NULL) {
error_setg(errp, "chardev: serial/tty: no device path given");
return;
}
backend->type = CHARDEV_BACKEND_KIND_SERIAL;
serial = backend->u.serial.data = g_new0(ChardevHostdev, 1);
qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(serial));
serial->device = g_strdup(device);
}
static void char_serial_class_init(ObjectClass *oc, void *data)
{
ChardevClass *cc = CHARDEV_CLASS(oc);
cc->parse = qemu_chr_parse_serial;
cc->open = qmp_chardev_open_serial;
#ifndef _WIN32
cc->chr_ioctl = tty_serial_ioctl;
#endif
}
static const TypeInfo char_serial_type_info = {
.name = TYPE_CHARDEV_SERIAL,
#ifdef _WIN32
.parent = TYPE_CHARDEV_WIN,
#else
.parent = TYPE_CHARDEV_FD,
#endif
.class_init = char_serial_class_init,
};
static void register_types(void)
{
type_register_static(&char_serial_type_info);
}
type_init(register_types);
#endif
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