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12fb0ac057
This patch fixes a bug in serial that made it almost impossible for guest to communicate with devices through host's serial. OPOST flag in c_oflag enables output processing letting other flags in c_oflag take effect. Usually in c_oflag ONLCR flag is also set, which causes crlf to be sent in place of lf. This breaks binary transmissions. Unsetting OPOST flag turns off any output processing which fixes the bug. Bug reports related: https://bugs.launchpad.net/qemu/+bug/1772086 https://bugs.launchpad.net/qemu/+bug/1407813 https://bugs.launchpad.net/qemu/+bug/1715296 also https://lists.nongnu.org/archive/html/qemu-devel/2006-06/msg00196.html Signed-off-by: Patryk Olszewski <patryk@fala.ehost.pl> Message-Id: <1527105041-21013-1-git-send-email-patryk@fala.ehost.pl> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
326 lines
8.3 KiB
C
326 lines
8.3 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/option.h"
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#include "qemu/sockets.h"
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#include "io/channel-file.h"
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#include "qapi/error.h"
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#ifdef _WIN32
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#include "chardev/char-win.h"
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#else
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#include <sys/ioctl.h>
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#include <termios.h>
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#include "chardev/char-fd.h"
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#endif
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#include "chardev/char-serial.h"
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#ifdef _WIN32
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static void qmp_chardev_open_serial(Chardev *chr,
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ChardevBackend *backend,
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bool *be_opened,
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Error **errp)
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{
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ChardevHostdev *serial = backend->u.serial.data;
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win_chr_serial_init(chr, serial->device, errp);
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}
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#elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \
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|| defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \
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|| defined(__GLIBC__)
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static void tty_serial_init(int fd, int speed,
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int parity, int data_bits, int stop_bits)
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{
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struct termios tty;
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speed_t spd;
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#if 0
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printf("tty_serial_init: speed=%d parity=%c data=%d stop=%d\n",
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speed, parity, data_bits, stop_bits);
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#endif
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tcgetattr(fd, &tty);
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#define check_speed(val) \
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if (speed <= val) { \
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spd = B##val; \
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goto done; \
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}
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speed = speed * 10 / 11;
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check_speed(50);
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check_speed(75);
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check_speed(110);
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check_speed(134);
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check_speed(150);
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check_speed(200);
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check_speed(300);
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check_speed(600);
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check_speed(1200);
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check_speed(1800);
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check_speed(2400);
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check_speed(4800);
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check_speed(9600);
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check_speed(19200);
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check_speed(38400);
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/* Non-Posix values follow. They may be unsupported on some systems. */
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check_speed(57600);
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check_speed(115200);
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#ifdef B230400
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check_speed(230400);
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#endif
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#ifdef B460800
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check_speed(460800);
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#endif
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#ifdef B500000
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check_speed(500000);
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#endif
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#ifdef B576000
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check_speed(576000);
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#endif
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#ifdef B921600
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check_speed(921600);
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#endif
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#ifdef B1000000
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check_speed(1000000);
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#endif
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#ifdef B1152000
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check_speed(1152000);
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#endif
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#ifdef B1500000
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check_speed(1500000);
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#endif
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#ifdef B2000000
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check_speed(2000000);
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#endif
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#ifdef B2500000
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check_speed(2500000);
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#endif
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#ifdef B3000000
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check_speed(3000000);
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#endif
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#ifdef B3500000
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check_speed(3500000);
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#endif
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#ifdef B4000000
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check_speed(4000000);
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#endif
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spd = B115200;
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#undef check_speed
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done:
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cfsetispeed(&tty, spd);
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cfsetospeed(&tty, spd);
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tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
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| INLCR | IGNCR | ICRNL | IXON);
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tty.c_oflag &= ~OPOST;
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tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG);
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tty.c_cflag &= ~(CSIZE | PARENB | PARODD | CRTSCTS | CSTOPB);
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switch (data_bits) {
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default:
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case 8:
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tty.c_cflag |= CS8;
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break;
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case 7:
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tty.c_cflag |= CS7;
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break;
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case 6:
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tty.c_cflag |= CS6;
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break;
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case 5:
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tty.c_cflag |= CS5;
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break;
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}
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switch (parity) {
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default:
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case 'N':
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break;
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case 'E':
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tty.c_cflag |= PARENB;
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break;
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case 'O':
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tty.c_cflag |= PARENB | PARODD;
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break;
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}
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if (stop_bits == 2) {
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tty.c_cflag |= CSTOPB;
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}
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tcsetattr(fd, TCSANOW, &tty);
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}
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static int tty_serial_ioctl(Chardev *chr, int cmd, void *arg)
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{
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FDChardev *s = FD_CHARDEV(chr);
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(s->ioc_in);
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switch (cmd) {
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case CHR_IOCTL_SERIAL_SET_PARAMS:
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{
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QEMUSerialSetParams *ssp = arg;
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tty_serial_init(fioc->fd,
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ssp->speed, ssp->parity,
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ssp->data_bits, ssp->stop_bits);
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}
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break;
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case CHR_IOCTL_SERIAL_SET_BREAK:
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{
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int enable = *(int *)arg;
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if (enable) {
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tcsendbreak(fioc->fd, 1);
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}
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}
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break;
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case CHR_IOCTL_SERIAL_GET_TIOCM:
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{
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int sarg = 0;
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int *targ = (int *)arg;
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ioctl(fioc->fd, TIOCMGET, &sarg);
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*targ = 0;
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if (sarg & TIOCM_CTS) {
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*targ |= CHR_TIOCM_CTS;
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}
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if (sarg & TIOCM_CAR) {
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*targ |= CHR_TIOCM_CAR;
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}
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if (sarg & TIOCM_DSR) {
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*targ |= CHR_TIOCM_DSR;
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}
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if (sarg & TIOCM_RI) {
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*targ |= CHR_TIOCM_RI;
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}
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if (sarg & TIOCM_DTR) {
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*targ |= CHR_TIOCM_DTR;
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}
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if (sarg & TIOCM_RTS) {
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*targ |= CHR_TIOCM_RTS;
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}
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}
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break;
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case CHR_IOCTL_SERIAL_SET_TIOCM:
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{
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int sarg = *(int *)arg;
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int targ = 0;
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ioctl(fioc->fd, TIOCMGET, &targ);
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targ &= ~(CHR_TIOCM_CTS | CHR_TIOCM_CAR | CHR_TIOCM_DSR
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| CHR_TIOCM_RI | CHR_TIOCM_DTR | CHR_TIOCM_RTS);
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if (sarg & CHR_TIOCM_CTS) {
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targ |= TIOCM_CTS;
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}
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if (sarg & CHR_TIOCM_CAR) {
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targ |= TIOCM_CAR;
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}
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if (sarg & CHR_TIOCM_DSR) {
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targ |= TIOCM_DSR;
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}
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if (sarg & CHR_TIOCM_RI) {
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targ |= TIOCM_RI;
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}
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if (sarg & CHR_TIOCM_DTR) {
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targ |= TIOCM_DTR;
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}
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if (sarg & CHR_TIOCM_RTS) {
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targ |= TIOCM_RTS;
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}
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ioctl(fioc->fd, TIOCMSET, &targ);
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}
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break;
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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static void qmp_chardev_open_serial(Chardev *chr,
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ChardevBackend *backend,
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bool *be_opened,
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Error **errp)
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{
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ChardevHostdev *serial = backend->u.serial.data;
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int fd;
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fd = qmp_chardev_open_file_source(serial->device, O_RDWR, errp);
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if (fd < 0) {
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return;
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}
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qemu_set_nonblock(fd);
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tty_serial_init(fd, 115200, 'N', 8, 1);
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qemu_chr_open_fd(chr, fd, fd);
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}
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#endif /* __linux__ || __sun__ */
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#ifdef HAVE_CHARDEV_SERIAL
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static void qemu_chr_parse_serial(QemuOpts *opts, ChardevBackend *backend,
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Error **errp)
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{
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const char *device = qemu_opt_get(opts, "path");
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ChardevHostdev *serial;
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if (device == NULL) {
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error_setg(errp, "chardev: serial/tty: no device path given");
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return;
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}
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backend->type = CHARDEV_BACKEND_KIND_SERIAL;
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serial = backend->u.serial.data = g_new0(ChardevHostdev, 1);
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qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(serial));
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serial->device = g_strdup(device);
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}
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static void char_serial_class_init(ObjectClass *oc, void *data)
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{
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ChardevClass *cc = CHARDEV_CLASS(oc);
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cc->parse = qemu_chr_parse_serial;
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cc->open = qmp_chardev_open_serial;
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#ifndef _WIN32
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cc->chr_ioctl = tty_serial_ioctl;
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#endif
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}
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static const TypeInfo char_serial_type_info = {
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.name = TYPE_CHARDEV_SERIAL,
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#ifdef _WIN32
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.parent = TYPE_CHARDEV_WIN,
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#else
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.parent = TYPE_CHARDEV_FD,
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#endif
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.class_init = char_serial_class_init,
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};
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static void register_types(void)
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{
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type_register_static(&char_serial_type_info);
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}
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type_init(register_types);
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#endif
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