usbreset.c for restart USB port

/* usbreset -- send a USB port reset to a USB device

You invoke it as either:
  usbreset /proc/bus/usb/BBB/DDD
or
  usbreset /dev/usbB.D
*/

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>

int main(int argc, char **argv)
{
      const char *filename;
      int fd;
      int rc;

      if (argc != 2) {
            fprintf(stderr, "Usage: usbreset device-filename\n");
            return 1;
      }
      filename = argv[1];

      fd = open(filename, O_WRONLY);
      if (fd < 0) {
            perror("Error opening output file");
            return 1;
      }

      printf("Resetting USB device %s\n", filename);
      rc = ioctl(fd, USBDEVFS_RESET, 0);
      if (rc < 0) {
            perror("Error in ioctl");
            return 1;
      }
      printf("Reset successful\n");

      close(fd);
      return 0;
}