Method Fuse.Operations()->open()

Method open: int open(string path, int mode)
Description: Open path . mode is as for the system call open. (mode & O_ACCMODE) is one of O_RDONLY, O_WRONLY and O_RDWR. The mode can also contain other flags, most notably O_APPEND.
Note: You do not really have to implement this function. It's useful to start prefetch and to cache open files, and check that the user has permission to read/write the file.
Returns: errno or 0