Creating and releasing a lock file

lock.c

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


#define PACKAGE "crlock"

//create the lock on the postgresql server
int logos_getlock_file()
{
    int fd = 0;
    while(1)
    {
         if((fd = open("/tmp/locked.file", O_RDWR|O_CREAT|O_EXCL, 0444)) == -1) {
         }
         else
             return fd;
    }
}
//release the lock on the postgresql server
void logos_releaselock_file(int fd)
{
     close(fd);
     unlink("/tmp/locked.file");
}