CS465 Slides - Regis University: Academic Web Server for Faculty
... • UNIX is an Operating System (OS). • An operating system is a control program that allocates the computer's resources, schedules tasks, and helps the user communicate with the computer. • Most popular PC operating systems: Windows 95/98/2000/XP -- proprietary, single-user OS • UNIX was developed lo ...
... • UNIX is an Operating System (OS). • An operating system is a control program that allocates the computer's resources, schedules tasks, and helps the user communicate with the computer. • Most popular PC operating systems: Windows 95/98/2000/XP -- proprietary, single-user OS • UNIX was developed lo ...
History of Unix OS - Seneca
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space wars” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do one ...
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space wars” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do one ...
View File
... • File management - Create, delete, copy, rename, print, dump, list, and generally manipulate files and directories • Status information – Some ask the system for info - date, time, amount of available memory, disk space, number of users – Others provide detailed performance, logging, and debugging ...
... • File management - Create, delete, copy, rename, print, dump, list, and generally manipulate files and directories • Status information – Some ask the system for info - date, time, amount of available memory, disk space, number of users – Others provide detailed performance, logging, and debugging ...
Why Study OS?
... Examples that are not provided at user level System calls: file open, close, read and write l Control the CPU so that users won’t stuck by running l ...
... Examples that are not provided at user level System calls: file open, close, read and write l Control the CPU so that users won’t stuck by running l ...
2.01 - Fordham University
... Apple Mac OS X as “Aqua” GUI interface with UNIX kernel underneath and shells available Solaris is CLI with optional GUI interfaces (Java Desktop, KDE) ...
... Apple Mac OS X as “Aqua” GUI interface with UNIX kernel underneath and shells available Solaris is CLI with optional GUI interfaces (Java Desktop, KDE) ...
PPT
... • There must be a system call instruction that: – causes an exception, which vectors to a kernel handler – passes a parameter, saying which system routine to call – saves caller’s state (PC, mode bit) so it can be restored – arch must permit os to verify caller’s parameters – must provide a way to r ...
... • There must be a system call instruction that: – causes an exception, which vectors to a kernel handler – passes a parameter, saying which system routine to call – saves caller’s state (PC, mode bit) so it can be restored – arch must permit os to verify caller’s parameters – must provide a way to r ...
Solution to assignment 2(B)
... Ques4: Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: The data required by the operating system ...
... Ques4: Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: The data required by the operating system ...
COS 318: Operating Systems Overview
... Examples that are not provided at user level System calls: file open, close, read and write l Control the CPU so that users won’t cause problems by running: l ...
... Examples that are not provided at user level System calls: file open, close, read and write l Control the CPU so that users won’t cause problems by running: l ...
資工系網媒所NEWS實驗室Chapter 2
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. File-system manipulation - The file system is of particular interest. Obviously, programs need to read and write files and directories, create and delete them, search them, list file Information, permissio ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. File-system manipulation - The file system is of particular interest. Obviously, programs need to read and write files and directories, create and delete them, search them, list file Information, permissio ...
Slides. - Department of Computer Science and Information Systems
... File system for a university department ...
... File system for a university department ...
csc1 intro
... 2. File Allocation Table (FAT)…. (list of file locations: starting position/cluster number on the disk) ...
... 2. File Allocation Table (FAT)…. (list of file locations: starting position/cluster number on the disk) ...
the user program.
... • This instruction switches the processor into a privileged operating mode (kernel mode) and jumps into the kernel through a well-defined trap address. • Parameters passed with the trap instruction tell the kernel what service is requested. • When the function is completed, the processor flips back ...
... • This instruction switches the processor into a privileged operating mode (kernel mode) and jumps into the kernel through a well-defined trap address. • Parameters passed with the trap instruction tell the kernel what service is requested. • When the function is completed, the processor flips back ...
Limited Direct Execution
... and returns control to the program that issued the system call. Thus, the parts of the C library that make system calls are hand-coded in assembly, as they need to carefully follow convention in order to process arguments and return values correctly, as well as execute the hardware-specific trap ins ...
... and returns control to the program that issued the system call. Thus, the parts of the C library that make system calls are hand-coded in assembly, as they need to carefully follow convention in order to process arguments and return values correctly, as well as execute the hardware-specific trap ins ...
Intro to UNIX - Regis University: Academic Web Server for Faculty
... • More than one user can run at the same time and each user can run more than one task at the same time • In Unix, each program is started as a process. – A process is a program in execution. • Usually only one copy of a program, but there may be many processes running the same program. • Each inter ...
... • More than one user can run at the same time and each user can run more than one task at the same time • In Unix, each program is started as a process. – A process is a program in execution. • Usually only one copy of a program, but there may be many processes running the same program. • Each inter ...
Principles of Operating System
... • Executes the instructions in the user program until it encounters an ending or error condition • “control is passed to a job” means processor is fetching and executing instructions in a user program • “control is returned to the monitor” means that the processor is fetching and executing instructi ...
... • Executes the instructions in the user program until it encounters an ending or error condition • “control is passed to a job” means processor is fetching and executing instructions in a user program • “control is returned to the monitor” means that the processor is fetching and executing instructi ...
History of Unix OS
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space travel” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do on ...
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space travel” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do on ...
chapter 1: operating system fundamentals
... • Service autonomy - owners control logic encapsulated by services offered • Service optimization - clients can ”shop” for the ”best” service • Service discoverability - meaningful descriptions available through discovery mechanisms • Service relevance - granularity is right for meaningful service ...
... • Service autonomy - owners control logic encapsulated by services offered • Service optimization - clients can ”shop” for the ”best” service • Service discoverability - meaningful descriptions available through discovery mechanisms • Service relevance - granularity is right for meaningful service ...
COS 318: Operating Systems Overview Prof. Margaret Martonosi Computer Science Department
... Change in control flow caused by something other than a jump or branch instruction Interrupt is external event ...
... Change in control flow caused by something other than a jump or branch instruction Interrupt is external event ...
Tutorail-two-with
... kept only where it is needed and is accessible only within a defined and restricted area, so any bugs affecting that data must be limited to a specific module or layer. ...
... kept only where it is needed and is accessible only within a defined and restricted area, so any bugs affecting that data must be limited to a specific module or layer. ...
OS Services System calls and their types
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them • Many types of resources - Some (such as CPU cycles, main ...
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing – Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them • Many types of resources - Some (such as CPU cycles, main ...
System Call - KOVAN Research Lab
... System-call interface maintains a table indexed according to these numbers The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values The caller need know nothing about how the system call is implemented Just needs to obey API and ...
... System-call interface maintains a table indexed according to these numbers The system call interface invokes intended system call in OS kernel and returns status of the system call and any return values The caller need know nothing about how the system call is implemented Just needs to obey API and ...
document
... designed for Intel’s new 16 bit microprocessor the 8086. While similar to CP/M it added features such as: – memory and timer management, – interrupt support, and a more sophisticated file system including a FAT table. – With more available memory, more commands could be built in to the command line ...
... designed for Intel’s new 16 bit microprocessor the 8086. While similar to CP/M it added features such as: – memory and timer management, – interrupt support, and a more sophisticated file system including a FAT table. – With more available memory, more commands could be built in to the command line ...