#include <stdlib.h>  /* for NULL            */
#include <stdio.h>   /* for fprintf         */
#include <string.h>  /* for memset          */

#include "fileLock.h" /* includes <fcntl.h> */

fileLock_p makeLock(void){
  fileLock_p retval = (fileLock_p)calloc(1, sizeof(fileLock_t));
  if(retval == NULL){
    perror("makeLock: calloc failed!");
  }
  return retval;
}

int getLock(fileLock_p lock, int fd){
  memset(lock, 0, sizeof(fileLock_t));
  lock->l_type = F_WRLCK;
  return fcntl(fd, F_SETLKW, lock);
}

int unLock(fileLock_p lock, int fd){
  lock->l_type = F_UNLCK;
  return fcntl(fd, F_SETLKW, lock);
}

void freeLock(fileLock_p lock){
  free(lock);
}