#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
#include <fcntl.h>
#include <syslog.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
-#include <sys/socket.h>
#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/stat.h>
#include <net/if.h>
+#include <termios.h>
/* default slcan line discipline since Kernel 2.6.25 */
#define LDISC_N_SLCAN 17
void print_usage(char *prg)
{
- fprintf(stderr, "\nUsage: %s tty [name]\n\n", prg);
- fprintf(stderr, "Example:\n");
- fprintf(stderr, "%s ttyUSB1\n", prg);
- fprintf(stderr, "%s ttyS0 can0\n", prg);
+ fprintf(stderr, "\nUsage: %s [options] <tty> [canif-name]\n\n", prg);
+ fprintf(stderr, "Options: -o (send open command 'O\\r')\n");
+ fprintf(stderr, " -c (send close command 'C\\r')\n");
+ fprintf(stderr, " -f (read status flags with 'F\\r' to reset error states)\n");
+ fprintf(stderr, " -s <speed> (set CAN speed 0..8)\n");
+ fprintf(stderr, " -S <speed> (set UART speed in baud)\n");
+ fprintf(stderr, " -b <btr> (set bit time register value)\n");
+ fprintf(stderr, " -F (stay in foreground; no daemonize)\n");
+ fprintf(stderr, " -h (show this help page)\n");
+ fprintf(stderr, "\nExamples:\n");
+ fprintf(stderr, "slcand -o -c -f -s6 ttyslcan0\n");
+ fprintf(stderr, "slcand -o -c -f -s6 ttyslcan0 can0\n");
fprintf(stderr, "\n");
exit(EXIT_FAILURE);
}
+static int slcand_running = 0;
+static int exit_code = 0;
+static char ttypath[TTYPATH_LENGTH];
+static char pidfile[PIDFILE_LENGTH];
+
static void child_handler (int signum)
{
- switch (signum)
- {
- case SIGALRM:
- exit (EXIT_FAILURE);
- break;
+ switch (signum) {
case SIGUSR1:
- exit (EXIT_SUCCESS);
+ /* exit parent */
+ exit(EXIT_SUCCESS);
break;
+ case SIGALRM:
case SIGCHLD:
- exit (EXIT_FAILURE);
+ syslog (LOG_NOTICE, "received signal %i on %s", signum, ttypath);
+ exit_code = EXIT_FAILURE;
+ slcand_running = 0;
+ break;
+ case SIGINT:
+ case SIGTERM:
+ syslog (LOG_NOTICE, "received signal %i on %s", signum, ttypath);
+ exit_code = EXIT_SUCCESS;
+ slcand_running = 0;
break;
}
}
-static void daemonize (const char *lockfile, char *tty)
+static int look_up_uart_speed(long int s)
+{
+ switch (s) {
+ case 9600:
+ return B9600;
+ case 19200:
+ return B19200;
+ case 38400:
+ return B38400;
+ case 57600:
+ return B57600;
+ case 115200:
+ return B115200;
+ case 230400:
+ return B230400;
+ case 460800:
+ return B460800;
+ case 500000:
+ return B500000;
+ case 576000:
+ return B576000;
+ case 921600:
+ return B921600;
+ case 1000000:
+ return B1000000;
+ case 1152000:
+ return B1152000;
+ case 1500000:
+ return B1500000;
+ case 2000000:
+ return B2000000;
+#ifdef B2500000
+ case 2500000:
+ return B2500000;
+#endif
+#ifdef B3000000
+ case 3000000:
+ return B3000000;
+#endif
+#ifdef B3500000
+ case 3500000:
+ return B3500000;
+#endif
+#ifdef B3710000
+ case 3710000
+ return B3710000;
+#endif
+#ifdef B4000000
+ case 4000000:
+ return B4000000;
+#endif
+ default:
+ return -1;
+ }
+}
+
+static pid_t daemonize (const char *lockfile, char *tty, char *name)
{
pid_t pid, sid, parent;
int lfp = -1;
FILE * pFile;
+ FILE * dummyFile;
char const *pidprefix = "/var/run/";
char const *pidsuffix = ".pid";
- char pidfile[PIDFILE_LENGTH];
snprintf(pidfile, PIDFILE_LENGTH, "%s%s-%s%s", pidprefix, DAEMON_NAME, tty, pidsuffix);
/* already a daemon */
if (getppid () == 1)
- return;
+ return 0;
/* Create the lock file as the current user */
if (lockfile && lockfile[0])
}
/* Trap signals that we expect to receive */
+ signal (SIGINT, child_handler);
+ signal (SIGTERM, child_handler);
signal (SIGCHLD, child_handler);
signal (SIGUSR1, child_handler);
signal (SIGALRM, child_handler);
{
/* Wait for confirmation from the child via SIGTERM or SIGCHLD, or
- for two seconds to elapse (SIGALRM). pause() should not return. */
- alarm (2);
+ for five seconds to elapse (SIGALRM). pause() should not return. */
+ alarm (5);
pause ();
-
exit (EXIT_FAILURE);
}
signal (SIGTTOU, SIG_IGN);
signal (SIGTTIN, SIG_IGN);
signal (SIGHUP, SIG_IGN); /* Ignore hangup signal */
- signal (SIGTERM, SIG_DFL); /* Die on SIGTERM */
+ signal (SIGINT, child_handler);
+ signal (SIGTERM, child_handler);
/* Change the file mode mask */
umask (0);
}
pFile = fopen (pidfile,"w");
- if (pFile == NULL)
+ if (NULL == pFile)
{
syslog (LOG_ERR, "unable to create pid file %s, code=%d (%s)",
pidfile, errno, strerror (errno));
}
/* Redirect standard files to /dev/null */
- freopen ("/dev/null", "r", stdin);
- freopen ("/dev/null", "w", stdout);
- freopen ("/dev/null", "w", stderr);
+ dummyFile = freopen ("/dev/null", "r", stdin);
+ dummyFile = freopen ("/dev/null", "w", stdout);
+ dummyFile = freopen ("/dev/null", "w", stderr);
/* Tell the parent process that we are A-okay */
- kill (parent, SIGUSR1);
+ //kill (parent, SIGUSR1);
+ return parent;
}
int main (int argc, char *argv[])
{
char *tty = NULL;
- char ttypath[TTYPATH_LENGTH];
char const *devprefix = "/dev/";
char *name = NULL;
char buf[IFNAMSIZ+1];
+ struct termios tios;
+ speed_t old_ispeed;
+ speed_t old_ospeed;
+
+ int opt;
+ int send_open = 0;
+ int send_close = 0;
+ int send_read_status_flags = 0;
+ char *speed = NULL;
+ char *uart_speed_str = NULL;
+ long int uart_speed = 0;
+ char *btr = NULL;
+ int run_as_daemon = 1;
+ pid_t parent_pid = 0;
+
+ ttypath[0] = '\0';
+
+ while ((opt = getopt(argc, argv, "ocfs:S:b:?hF")) != -1) {
+ switch (opt) {
+ case 'o':
+ send_open = 1;
+ break;
+ case 'c':
+ send_close = 1;
+ break;
+ case 'f':
+ send_read_status_flags = 1;
+ break;
+ case 's':
+ speed = optarg;
+ if (strlen(speed) > 1)
+ print_usage(argv[0]);
+ break;
+ case 'S':
+ uart_speed_str = optarg;
+ errno = 0;
+ uart_speed = strtol(uart_speed_str, NULL, 10);
+ if (errno)
+ print_usage(argv[0]);
+ if (look_up_uart_speed(uart_speed) == -1) {
+ fprintf(stderr, "Unsupported UART speed (%lu)\n", uart_speed);
+ exit(EXIT_FAILURE);
+ }
+ break;
+ case 'b':
+ btr = optarg;
+ if (strlen(btr) > 6)
+ print_usage(argv[0]);
+ break;
+ case 'F':
+ run_as_daemon = 0;
+ break;
+ case 'h':
+ case '?':
+ default:
+ print_usage(argv[0]);
+ break;
+ }
+ }
/* Initialize the logging interface */
openlog (DAEMON_NAME, LOG_PID, LOG_LOCAL5);
- /* See how we're called */
- if (argc == 2) {
- tty = argv[1];
- } else if (argc == 3) {
- tty = argv[1];
- name = argv[2];
- if (strlen(name) > IFNAMSIZ-1)
- print_usage(argv[0]);
- } else {
+ /* Parse serial device name and optional can interface name */
+ tty = argv[optind];
+ if(NULL == tty) {
print_usage(argv[0]);
}
+ name = argv[optind + 1];
/* Prepare the tty device name string */
char * pch;
syslog (LOG_INFO, "starting on TTY device %s", ttypath);
/* Daemonize */
- daemonize ("/var/lock/" DAEMON_NAME, tty);
+ if(run_as_daemon) {
+ parent_pid = daemonize ("/var/lock/" DAEMON_NAME, tty, name);
+ }
+ else {
+ /* Trap signals that we expect to receive */
+ signal (SIGINT, child_handler);
+ signal (SIGTERM, child_handler);
+ }
+
+ /* */
+ slcand_running = 1;
/* Now we are a daemon -- do the work for which we were paid */
int fd;
int ldisc = LDISC_N_SLCAN;
- if ((fd = open (ttypath, O_WRONLY | O_NOCTTY )) < 0) {
+ if ((fd = open (ttypath, O_RDWR | O_NONBLOCK | O_NOCTTY )) < 0) {
syslog (LOG_NOTICE, "failed to open TTY device %s\n", ttypath);
perror(ttypath);
- exit(1);
+ exit(EXIT_FAILURE);
+ }
+
+ /* Configure baud rate */
+ memset(&tios, 0, sizeof(struct termios));
+ if(tcgetattr(fd, &tios) < 0) {
+ syslog (LOG_NOTICE, "failed to get attributes for TTY device %s: %s\n", ttypath, strerror(errno));
+ exit (EXIT_FAILURE);
+ }
+
+ /* Get old values for later restore */
+ old_ispeed = cfgetispeed(&tios);
+ old_ospeed = cfgetospeed(&tios);
+
+ /* Baud Rate */
+ cfsetispeed(&tios, look_up_uart_speed(uart_speed));
+ cfsetospeed(&tios, look_up_uart_speed(uart_speed));
+
+ /* apply changes */
+ if(tcsetattr(fd, TCSADRAIN, &tios) < 0) {
+ syslog(LOG_NOTICE, "Cannot set attributes for device \"%s\": %s!\n", ttypath, strerror(errno));
+ }
+
+ if (speed) {
+ sprintf(buf, "C\rS%s\r", speed);
+ if(write(fd, buf, strlen(buf)) < 0) {
+ //syslog (LO, "failed to get attributes for TTY device %s: %s\n", ttypath, strerror(errno));
+ }
+ }
+
+ if (btr) {
+ sprintf(buf, "C\rs%s\r", btr);
+ write(fd, buf, strlen(buf));
+ }
+
+ if (send_read_status_flags) {
+ sprintf(buf, "F\r");
+ write(fd, buf, strlen(buf));
+ }
+
+ if (send_open) {
+ sprintf(buf, "O\r");
+ write(fd, buf, strlen(buf));
}
/* set slcan like discipline on given tty */
close(s);
}
}
+ if(parent_pid > 0) {
+ kill(parent_pid, SIGUSR1);
+ }
/* The Big Loop */
- while (1) {
- sleep(60); /* wait 60 seconds */
+ while (slcand_running) {
+ sleep(1); /* wait 1 second */
+ }
+
+ /* Reset line discipline */
+ syslog (LOG_INFO, "stopping on TTY device %s", ttypath);
+ ldisc = N_TTY;
+ if (ioctl (fd, TIOCSETD, &ldisc) < 0) {
+ perror("ioctl TIOCSETD");
+ exit(EXIT_FAILURE);
+ }
+
+ if (send_close) {
+ sprintf(buf, "C\r");
+ write(fd, buf, strlen(buf));
+ }
+
+ /* Reset old rates */
+ cfsetispeed(&tios, old_ispeed);
+ cfsetospeed(&tios, old_ospeed);
+
+ /* apply changes */
+ if(tcsetattr(fd, TCSADRAIN, &tios) < 0) {
+ syslog(LOG_NOTICE, "Cannot set attributes for device \"%s\": %s!\n", ttypath, strerror(errno));
+ }
+
+ /* Remove pidfile */
+ if(run_as_daemon) {
+ unlink(pidfile);
}
/* Finish up */
syslog (LOG_NOTICE, "terminated on %s", ttypath);
closelog ();
- return 0;
+ return exit_code;
}
projects / can-utils.git / commitdiff