share/examples/rump/tipsy/tipsy.c

   1 /*      $NetBSD$        */
   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                 exit(0);
 105
 106         com = rump_sys_open("/dev/dtyU0", O_RDWR);
 107         if (com == -1)
 108                 err(1, "rump ucom open failed");
 109
 110         /*
 111          * Setup the com port.  You might need to tweak this.
 112          */
 113         if (rump_sys_ioctl(com, TIOCGETA, &tios) == -1)
 114                 err(1, "rump get term");
 115         tios.c_cflag &= ~(CSIZE|PARENB);
 116         tios.c_cflag |= CS8;
 117         tios.c_cflag |= CLOCAL;
 118         tios.c_iflag &= ~(ISTRIP|ICRNL);
 119         tios.c_oflag &= ~OPOST;
 120         tios.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
 121         tios.c_cc[VMIN] = 1;
 122         tios.c_cc[VTIME] = 0;
 123         if (rump_sys_ioctl(com, TIOCSETA, &tios) == -1)
 124                 err(1, "rump set term");
 125
 126         /* setup stdin */
 127         if (tcgetattr(STDIN_FILENO, &tios) == -1)
 128                 err(1, "host get term");
 129         tios.c_oflag &= ~OPOST;
 130         tios.c_iflag &= ~(INPCK|ICRNL);
 131         tios.c_lflag &= ~(ICANON|IEXTEN|ECHO);
 132         tios.c_cc[VINTR] = tios.c_cc[VQUIT] = tios.c_cc[VSUSP]
 133             = tios.c_cc[VDSUSP] = tios.c_cc[VDISCARD] = tios.c_cc[VREPRINT]
 134             = tios.c_cc[VLNEXT] = _POSIX_VDISABLE;
 135         tios.c_cc[VMIN] = 1;
 136         tios.c_cc[VTIME] = 0;
 137         if (tcsetattr(STDIN_FILENO, TCSADRAIN, &tios) == -1)
 138                 err(1, "host set term");
 139
 140         if (pthread_create(&pt, NULL, shovel, (void *)(intptr_t)com) == -1)
 141                 err(1, "pthread create");
 142
 143         /* read stdin, feed that into the rump kernel */
 144         for (;;) {
 145                 char ch;
 146
 147                 ch = getchar();
 148                 if (rump_sys_write(com, &ch, 1) != 1)
 149                         err(1, "rump write");
 150         }
 151 }