ocr: The first argument to open() IS a file name, the second argument specifies how the file is tol be opened. If there are no errors, the function returns a file descriptor; otherwise, the value -1 IS returned. The identifier in fd is mnemonic for "in file descriptor. H On our system, the symbolic constant 0 RDONLY is given in fcntl.h. It is mnemonic for "open for reading only.'
