ocr: The symbolic constants in fent.h that are used to open a file can be combined with the bitwise OR operator. Here, we are specilying that the file is tol be opened for writing only, that the file is to be opened exclusively, and that the file is to be created ifit doess not exist. 0 EXCL gets used only with ) - - CREAT. Ifthe file is created, then the third argument sets the file permissions; otherwise, the argument has no effect. We will explain about file permissions later on.
