@c Create a directory
This is the usual UNIX mkdir function. The difference is that the access code is always 0777 on UNIX which means that the user, group and others can read, write and execute the directory. If the permission needed is different from that you have to call the file_chmod function as soon as it becomes available.
The argument of the function is the name of the desired directory.
int file_mkdir(char *pszDirectoryName
){