Chapter 10. Case Study 1: UNIX and LINUX. 10.1 History of unix 10.2 Overview of unix 10.3 Processes in unix 10.4 Memory management in unix 10.5 Input/output in unix 10.6 The unix file system 10.7 Security in unix . UNIX. User Interface. The layers of a UNIX system.
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The layers of a UNIX system.
A few of the more common UNIX utility programs required by POSIX
Approximate structure of generic UNIX kernel
Process creation in UNIX.
The signals required by POSIX.
s is an error code
pid is a process ID
residual is the remaining time from the previous alarm
A highly simplified shell
The principal POSIX thread calls.
Steps in executing the command ls type to the shell
Bits in the sharing_flags bitmap
The UNIX scheduler is based on a multilevel queue structure
The sequences of processes used to boot some systems
Two processes can share a mapped file.
A new file mapped simultaneously into two processes
The core map in 4BSD.
The core map has an entry for each page
Linux uses three-level page tables
Operation of the buddy algorithm.
Use of sockets for networking
The main POSIX calls for managing the terminal
Some of the fields of a typical cdevsw table
The UNIX I/O system in BSD
An example of streams in System V
Some important directories found in most UNIX systems
(a) Before linking. (b) After linking
(a) Before mounting. (b) After mounting
(a) File with one lock
(b) Addition of a second lock
(c) A third lock
Fields returned by the lstat system call.
Disk layout in classical UNIX systems
Directory entry fields.
Structure of the i-node
The relation between the file descriptor table, the open file description
Layout of the Linux Ex2 file system.
The NFS layer structure.
The NFS layer structure
Some examples of file protection modes