#define _GNU_SOURCE

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

int main(
   const int                  argc,
   const char * const * const argv,
   const char * const * const envp
)
{
   int fd;
   int result;
   fd = open(argv[1], O_RDWR, 0);
   if (fd < 0) {
      perror("open");
      exit(1);
   }

   result = fcntl(fd, F_SETLEASE, F_WRLCK);
   if (result != 0) {
      perror("setlease wrlck");
      exit(1);
   }

   usleep(10000000);

   result = fcntl(fd, F_SETLEASE, F_UNLCK);
   if (result != 0) {
      perror("setlease unlck");
      exit(1);
   }

   result = close(fd);
   if (result != 0) {
      perror("close");
      exit(1);
   }

   return 0;
}