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 *
shovel(void * arg)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
main(int argc,char * argv[])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