file management

Slide 38 of 91

Notes:

Fcntl - 4 different functions in 1

1) Duplicate

2) File descriptor flags - only 1 - FD_CLOEXEC - file is closed across an exec

3) File status flags - O_RDONLY, O_WRONLY, O_RDWR, O_APPEND,

O_CREAT, O_TRUNC, O_EXCL, O_NONBLOCK

-set: only O_APPEND and O_NONBLOCK can be changed

4) Record or range locking or byte locking