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flock-copyup.c

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

int main(int argc, char *argv[]) {
      int fd;
      struct flock lock;

      if (argc != 2) {
            fprintf(stderr, "%s file\n", argv[0]);
            exit(1);
      }

      fd = open(argv[1], O_RDWR);
      if (fd == -1) {
            perror("open");
            exit(1);
      }

      lock.l_type = F_WRLCK;
      lock.l_whence = SEEK_SET;
      lock.l_start = 0;
      lock.l_len = 0;

      if (fcntl(fd, F_SETLK, &lock) == -1) {
            perror("fcntl");
            exit(1);
      }

      exit(0);
}

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