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      1 /*	$NetBSD: tipsy.c,v 1.2 2010/02/18 16:14:55 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2009 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 /*
     29  * Experimental proof-of-concept program:
     30  *
     31  * tip-on-booze.  Uses rump kernel for ucom driver + underlying
     32  * hardware.  Just shovels bits back and forth between the user
     33  * terminal and the ucom device.
     34  *
     35  * Seems to drop an occasional character for output here and there.
     36  * Haven't pinpointed the problem yet.  It happens commonly for certain
     37  * patterns such as ctrl-U followed by immediate typing.  Tipsy is quite
     38  * sober despite this "feature".
     39  */
     40 
     41 #include <sys/types.h>
     42 #include <sys/ioctl.h>
     43 
     44 #include <rump/rump.h>
     45 #include <rump/rump_syscalls.h>
     46 
     47 #include <err.h>
     48 #include <errno.h>
     49 #include <fcntl.h>
     50 #include <pthread.h>
     51 #include <stdio.h>
     52 #include <stdlib.h>
     53 #include <string.h>
     54 #include <unistd.h>
     55 #include <termios.h>
     56 
     57 /*
     58  * We use a shovel thread to get the bits from the rump kernel and
     59  * print them on the terminal.  The reason for a thread instead of
     60  * polling is that we currently have no way to poll two fd's when
     61  * they are in different kernels (stdin in the host, ucom in rump).
     62  */
     63 static void *
     64 shovel(void *arg)
     65 {
     66 	char buf[64];
     67 	ssize_t n;
     68 	int fd = (int)(intptr_t)arg;
     69 
     70 	for (;;) {
     71 		n = rump_sys_read(fd, buf, sizeof(buf));
     72 		if (__predict_false(n <= 0)) {
     73 			if (n == 0)
     74 				errx(1, "ucom EOF");
     75 			if (n == -1)
     76 				err(1, "ucom read");
     77 		}
     78 		if (write(STDOUT_FILENO, buf, n) != n)
     79 			err(1, "write to console");
     80 	}
     81 }
     82 
     83 int
     84 main(int argc, char *argv[])
     85 {
     86 	pthread_t pt;
     87         struct termios tios;
     88 	int probeonly = 0;
     89 	int com;
     90 
     91 	if (argc > 1) {
     92 		if (argc == 2 && strcmp(argv[1], "probe") == 0) {
     93 			probeonly = 1;
     94 		} else {
     95 			fprintf(stderr, "mind the usage\n");
     96 			exit(1);
     97 		}
     98 	}
     99 
    100 	if (probeonly)
    101 		rump_boot_sethowto(RUMP_AB_VERBOSE);
    102 	rump_init();
    103 	if (probeonly) {
    104 		pause();
    105 		exit(0);
    106 	}
    107 
    108 	com = rump_sys_open("/dev/dtyU0", O_RDWR);
    109 	if (com == -1)
    110 		err(1, "rump ucom open failed");
    111 
    112 	/*
    113 	 * Setup the com port.  You might need to tweak this.
    114 	 */
    115 	if (rump_sys_ioctl(com, TIOCGETA, &tios) == -1)
    116 		err(1, "rump get term");
    117 	tios.c_cflag &= ~(CSIZE|PARENB);
    118 	tios.c_cflag |= CS8;
    119 	tios.c_cflag |= CLOCAL;
    120 	tios.c_iflag &= ~(ISTRIP|ICRNL);
    121 	tios.c_oflag &= ~OPOST;
    122 	tios.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
    123 	tios.c_cc[VMIN] = 1;
    124 	tios.c_cc[VTIME] = 0;
    125 	if (rump_sys_ioctl(com, TIOCSETA, &tios) == -1)
    126 		err(1, "rump set term");
    127 
    128 	/* setup stdin */
    129 	if (tcgetattr(STDIN_FILENO, &tios) == -1)
    130 		err(1, "host get term");
    131 	tios.c_oflag &= ~OPOST;
    132 	tios.c_iflag &= ~(INPCK|ICRNL);
    133 	tios.c_lflag &= ~(ICANON|IEXTEN|ECHO);
    134 	tios.c_cc[VINTR] = tios.c_cc[VQUIT] = tios.c_cc[VSUSP]
    135 	    = tios.c_cc[VDSUSP] = tios.c_cc[VDISCARD] = tios.c_cc[VREPRINT]
    136 	    = tios.c_cc[VLNEXT] = _POSIX_VDISABLE;
    137         tios.c_cc[VMIN] = 1;
    138         tios.c_cc[VTIME] = 0;
    139         if (tcsetattr(STDIN_FILENO, TCSADRAIN, &tios) == -1)
    140 		err(1, "host set term");
    141 
    142 	if (pthread_create(&pt, NULL, shovel, (void *)(intptr_t)com) == -1)
    143 		err(1, "pthread create");
    144 
    145 	/* read stdin, feed that into the rump kernel */
    146 	for (;;) {
    147 		char ch;
    148 
    149 		ch = getchar();
    150 		if (rump_sys_write(com, &ch, 1) != 1)
    151 			err(1, "rump write");
    152 	}
    153 }
    154