6 * slcan_attach.c - userspace tool for serial line CAN interface driver SLCAN
8 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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20 * may be used to endorse or promote products derived from this software
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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
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44 * Send feedback to <socketcan-users@lists.berlios.de>
54 #include <sys/ioctl.h>
56 #define LDISC_N_SLCAN 17 /* default slcan line discipline since Kernel 2.6.25 */
58 void print_usage(char *prg)
60 fprintf(stderr, "\nUsage: %s [options] tty\n\n", prg);
61 fprintf(stderr, "Options: -o (send open command 'O\\r')\n");
62 fprintf(stderr, " -c (send close command 'C\\r')\n");
63 fprintf(stderr, " -s <speed> (set CAN speed 0..8)\n");
64 fprintf(stderr, " -b <btr> (set bit time register value)\n");
65 fprintf(stderr, " -d (only detach line discipline)\n");
66 fprintf(stderr, " -w (attach - wait for keypess - detach)\n");
67 fprintf(stderr, "\nExamples:\n");
68 fprintf(stderr, "slcan_attach -w -o -s6 -c /dev/ttyS1\n");
69 fprintf(stderr, "slcan_attach /dev/ttyS1\n");
70 fprintf(stderr, "slcan_attach -d /dev/ttyS1\n");
71 fprintf(stderr, "\n");
75 int main(int argc, char **argv)
78 int ldisc = LDISC_N_SLCAN;
89 while ((opt = getopt(argc, argv, "l:dwocs:b:")) != -1) {
92 fprintf(stderr, "Ignored option '-l'\n");
113 if (strlen(speed) > 1)
114 print_usage(argv[0]);
120 print_usage(argv[0]);
124 print_usage(argv[0]);
129 if (argc - optind != 1)
130 print_usage(argv[0]);
134 if ((fd = open (tty, O_WRONLY | O_NOCTTY)) < 0) {
139 if (waitkey || !detach) {
142 sprintf(buf, "S%s\r", speed);
143 write(fd, buf, strlen(buf));
147 sprintf(buf, "s%s\r", btr);
148 write(fd, buf, strlen(buf));
153 write(fd, buf, strlen(buf));
156 if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
163 printf("Press any key to detach %s ...\n", tty);
167 if (waitkey || detach) {
169 if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
176 write(fd, buf, strlen(buf));