6 * slcan_attach.c - userspace tool for serial line CAN interface driver SLCAN
8 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of Volkswagen nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * Alternatively, provided that this notice is retained in full, this
24 * software may be distributed under the terms of the GNU General
25 * Public License ("GPL") version 2, in which case the provisions of the
26 * GPL apply INSTEAD OF those given above.
28 * The provided data structures and external interfaces from this code
29 * are not restricted to be used by modules with a GPL compatible license.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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44 * Send feedback to <linux-can@vger.kernel.org>
54 #include <sys/socket.h>
55 #include <sys/ioctl.h>
59 #define LDISC_N_SLCAN 17 /* default slcan line discipline since Kernel 2.6.25 */
61 void print_usage(char *prg)
63 fprintf(stderr, "\nUsage: %s [options] tty\n\n", prg);
64 fprintf(stderr, "Options: -o (send open command 'O\\r')\n");
65 fprintf(stderr, " -c (send close command 'C\\r')\n");
66 fprintf(stderr, " -f (read status flags with 'F\\r' to reset error states)\n");
67 fprintf(stderr, " -s <speed> (set CAN speed 0..8)\n");
68 fprintf(stderr, " -b <btr> (set bit time register value)\n");
69 fprintf(stderr, " -d (only detach line discipline)\n");
70 fprintf(stderr, " -w (attach - wait for keypess - detach)\n");
71 fprintf(stderr, " -n <name> (assign created netdevice name)\n");
72 fprintf(stderr, "\nExamples:\n");
73 fprintf(stderr, "slcan_attach -w -o -f -s6 -c /dev/ttyS1\n");
74 fprintf(stderr, "slcan_attach /dev/ttyS1\n");
75 fprintf(stderr, "slcan_attach -d /dev/ttyS1\n");
76 fprintf(stderr, "slcan_attach -w -n can15 /dev/ttyS1\n");
77 fprintf(stderr, "\n");
81 int main(int argc, char **argv)
84 int ldisc = LDISC_N_SLCAN;
89 int send_read_status_flags = 0;
97 while ((opt = getopt(argc, argv, "l:dwocfs:b:n:?")) != -1) {
100 fprintf(stderr, "Ignored option '-l'\n");
120 send_read_status_flags = 1;
125 if (strlen(speed) > 1)
126 print_usage(argv[0]);
132 print_usage(argv[0]);
137 if (strlen(name) > IFNAMSIZ-1)
138 print_usage(argv[0]);
143 print_usage(argv[0]);
148 if (argc - optind != 1)
149 print_usage(argv[0]);
153 if ((fd = open (tty, O_WRONLY | O_NOCTTY)) < 0) {
158 if (waitkey || !detach) {
161 sprintf(buf, "C\rS%s\r", speed);
162 write(fd, buf, strlen(buf));
166 sprintf(buf, "C\rs%s\r", btr);
167 write(fd, buf, strlen(buf));
170 if (send_read_status_flags) {
172 write(fd, buf, strlen(buf));
177 write(fd, buf, strlen(buf));
180 /* set slcan line discipline on given tty */
181 if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
182 perror("ioctl TIOCSETD");
186 /* retrieve the name of the created CAN netdevice */
187 if (ioctl (fd, SIOCGIFNAME, buf) < 0) {
188 perror("ioctl SIOCGIFNAME");
192 printf("attached tty %s to netdevice %s\n", tty, buf);
194 /* try to rename the created device if requested */
197 int s = socket(PF_INET, SOCK_DGRAM, 0);
199 printf("rename netdevice %s to %s ... ", buf, name);
202 perror("socket for interface rename");
204 strncpy (ifr.ifr_name, buf, IFNAMSIZ);
205 strncpy (ifr.ifr_newname, name, IFNAMSIZ);
207 if (ioctl(s, SIOCSIFNAME, &ifr) < 0)
218 printf("Press any key to detach %s ...\n", tty);
222 if (waitkey || detach) {
224 if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
231 write(fd, buf, strlen(buf));