Lecture "Operating system - Chapter 10: Case study 1 - Unix and Linux" has contents: History of unix, overview of unix, processes in unix, memory management in unix, input/output in unix, the unix file system, security in unix. | Case Study 1: UNIX and LINUX Chapter 10 History of unix Overview of unix Processes in unix Memory management in unix Input/output in unix The unix file system Security in unix UNIX The layers of a UNIX system. User Interface UNIX Utility Programs A few of the more common UNIX utility programs required by POSIX UNIX Kernel Approximate structure of generic UNIX kernel Processes in UNIX Process creation in UNIX. POSIX The signals required by POSIX. System Calls for Process Management s is an error code pid is a process ID residual is the remaining time from the previous alarm POSIX Shell A highly simplified shell Threads in POSIX The principal POSIX thread calls. The ls Command Steps in executing the command ls type to the shell Flags for Linux clone Bits in the sharing_flags bitmap UNIX Scheduler The UNIX scheduler is based on a multilevel queue structure Booting UNIX The sequences of processes used to . | Case Study 1: UNIX and LINUX Chapter 10 History of unix Overview of unix Processes in unix Memory management in unix Input/output in unix The unix file system Security in unix UNIX The layers of a UNIX system. User Interface UNIX Utility Programs A few of the more common UNIX utility programs required by POSIX UNIX Kernel Approximate structure of generic UNIX kernel Processes in UNIX Process creation in UNIX. POSIX The signals required by POSIX. System Calls for Process Management s is an error code pid is a process ID residual is the remaining time from the previous alarm POSIX Shell A highly simplified shell Threads in POSIX The principal POSIX thread calls. The ls Command Steps in executing the command ls type to the shell Flags for Linux clone Bits in the sharing_flags bitmap UNIX Scheduler The UNIX scheduler is based on a multilevel queue structure Booting UNIX The sequences of processes used to boot some systems cp Handling Memory Process A's virtual address space Physical memory Process B's virtual address space Process A Process B Sharing Files Two processes can share a mapped file. A new file mapped simultaneously into two processes System Calls for Memory Management s is an error code b and addr are memory addresses len is a length prot controls protection flags are miscellaneous bits fd is a file descriptor offset is a file offset Paging in UNIX The core map in 4BSD. The core map has an entry for each page Paging in Linux (1) Linux uses three-level page tables Paging in Linux (2) Operation of the buddy algorithm. Buddy algorithm Networking Use of sockets for networking Terminal Management The main POSIX calls for managing the terminal UNIX I/O (1) Some of the fields of a typical cdevsw table UNIX I/O (2) The UNIX I/O system in BSD Streams An example of streams in System V The UNIX File System (1) Some important directories .
