/* root-side sequence demonstrating the ungated register/clear path */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/diskslice.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
int main(int argc, char **argv){
  int fd = open(argv[1], O_RDONLY); u_int u = 0; int r;
  r = ioctl(fd, DIOCGKERNELDUMP, &u);
  printf("disable  -> %d errno=%d (%s)\n", r, errno, r?strerror(errno):"OK");
  u = 1;
  r = ioctl(fd, DIOCGKERNELDUMP, &u);
  printf("enable   -> %d errno=%d (%s)\n", r, errno, r?strerror(errno):"OK");
  r = ioctl(fd, DIOCGKERNELDUMP, &u);
  printf("enable2  -> %d errno=%d (%s)  (EBUSY==dumper registered)\n", r, errno, r?strerror(errno):"OK");
  return 0;
}