/* $NetBSD: tipsy.c,v 1.2 2010/02/18 16:14:55 pooka Exp $ */
/*
* Copyright (c) 2009 Antti Kantee. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Experimental proof-of-concept program:
*
* tip-on-booze. Uses rump kernel for ucom driver + underlying
* hardware. Just shovels bits back and forth between the user
* terminal and the ucom device.
*
* Seems to drop an occasional character for output here and there.
* Haven't pinpointed the problem yet. It happens commonly for certain
* patterns such as ctrl-U followed by immediate typing. Tipsy is quite
* sober despite this "feature".
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <rump/rump.h>
#include <rump/rump_syscalls.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <termios.h>
/*
* We use a shovel thread to get the bits from the rump kernel and
* print them on the terminal. The reason for a thread instead of
* polling is that we currently have no way to poll two fd's when
* they are in different kernels (stdin in the host, ucom in rump).
*/
static void *
shovel(void *arg)
{
char buf[64];
ssize_t n;
int fd = (int)(intptr_t)arg;
for (;;) {
n = rump_sys_read(fd, buf, sizeof(buf));
if (__predict_false(n <= 0)) {
if (n == 0)
errx(1, "ucom EOF");
if (n == -1)
err(1, "ucom read");
}
if (write(STDOUT_FILENO, buf, n) != n)
err(1, "write to console");
}
}
int
main(int argc, char *argv[])
{
pthread_t pt;
struct termios tios;
int probeonly = 0;
int com;
if (argc > 1) {
if (argc == 2 && strcmp(argv[1], "probe") == 0) {
probeonly = 1;
} else {
fprintf(stderr, "mind the usage\n");
exit(1);
}
}
if (probeonly)
rump_boot_sethowto(RUMP_AB_VERBOSE);
rump_init();
if (probeonly) {
pause();
exit(0);
}
com = rump_sys_open("/dev/dtyU0", O_RDWR);
if (com == -1)
err(1, "rump ucom open failed");
/*
* Setup the com port. You might need to tweak this.
*/
if (rump_sys_ioctl(com, TIOCGETA, &tios) == -1)
err(1, "rump get term");
tios.c_cflag &= ~(CSIZE|PARENB);
tios.c_cflag |= CS8;
tios.c_cflag |= CLOCAL;
tios.c_iflag &= ~(ISTRIP|ICRNL);
tios.c_oflag &= ~OPOST;
tios.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
if (rump_sys_ioctl(com, TIOCSETA, &tios) == -1)
err(1, "rump set term");
/* setup stdin */
if (tcgetattr(STDIN_FILENO, &tios) == -1)
err(1, "host get term");
tios.c_oflag &= ~OPOST;
tios.c_iflag &= ~(INPCK|ICRNL);
tios.c_lflag &= ~(ICANON|IEXTEN|ECHO);
tios.c_cc[VINTR] = tios.c_cc[VQUIT] = tios.c_cc[VSUSP]
= tios.c_cc[VDSUSP] = tios.c_cc[VDISCARD] = tios.c_cc[VREPRINT]
= tios.c_cc[VLNEXT] = _POSIX_VDISABLE;
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
if (tcsetattr(STDIN_FILENO, TCSADRAIN, &tios) == -1)
err(1, "host set term");
if (pthread_create(&pt, NULL, shovel, (void *)(intptr_t)com) == -1)
err(1, "pthread create");
/* read stdin, feed that into the rump kernel */
for (;;) {
char ch;
ch = getchar();
if (rump_sys_write(com, &ch, 1) != 1)
err(1, "rump write");
}
}