System
... – User ID then associated with all files, processes of that user to determine access control – Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with each process, file – Privilege escalation allows user to change to effective ID with more right ...
... – User ID then associated with all files, processes of that user to determine access control – Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with each process, file – Privilege escalation allows user to change to effective ID with more right ...
virtual machine
... and the operating system kernel as though they were all hardware • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory ...
... and the operating system kernel as though they were all hardware • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory ...
Operating System
... • Operating System - software that manages resources of a computer & provides interfaces to them. • Device - piece of hardware connected to the main computer hardware. • Device controller - electronic interface which controls devices connected to the computer. ...
... • Operating System - software that manages resources of a computer & provides interfaces to them. • Device - piece of hardware connected to the main computer hardware. • Device controller - electronic interface which controls devices connected to the computer. ...
Presentation
... OS must be in sync with the CPU Applications must be compiled to run in either real or protected mode Hybrid of real and protected mode used by older software written for Windows 3.x ...
... OS must be in sync with the CPU Applications must be compiled to run in either real or protected mode Hybrid of real and protected mode used by older software written for Windows 3.x ...
Slides. - Department of Computer Science and Information Systems
... 5. Input/output 6. File systems 7. Multimedia operating systems 8. Multiple processor systems 9. Security UNIX and Windows are to be used as running case studies. ...
... 5. Input/output 6. File systems 7. Multimedia operating systems 8. Multiple processor systems 9. Security UNIX and Windows are to be used as running case studies. ...
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 ...
Lec1
... is no way for a program to even talk about other program’s addresses; no way for it to touch operating system code or data. Translation also helps with the issue of how to stuff multiple programs into memory. Translation is implemented using some form of table lookup (we’ll discuss various optio ...
... is no way for a program to even talk about other program’s addresses; no way for it to touch operating system code or data. Translation also helps with the issue of how to stuff multiple programs into memory. Translation is implemented using some form of table lookup (we’ll discuss various optio ...
Enhanced Guide to Managing & Maintaining Your PC, 3e
... depend on low-level software to manage the hardware for it Applications software depends on the OS to interface with hardware • Instructs hardware directly • Uses BIOS to provide the instructions • Uses device drivers ...
... depend on low-level software to manage the hardware for it Applications software depends on the OS to interface with hardware • Instructs hardware directly • Uses BIOS to provide the instructions • Uses device drivers ...
Operating Systems CS208
... OS must manage process scheduling and provide memory protection to keep one program from crashing the system or corrupting other programs. ...
... OS must manage process scheduling and provide memory protection to keep one program from crashing the system or corrupting other programs. ...
Operating System
... • OS code executes in the Kernel mode – Called via interrupts and system calls • Only the OS code is allowed to be executed in the Kernel mode • The user code must never be executed in the ...
... • OS code executes in the Kernel mode – Called via interrupts and system calls • Only the OS code is allowed to be executed in the Kernel mode • The user code must never be executed in the ...
CS 111
... then if this memory for the BIOS is read-only, that means if we ever want to change the software (as if there were any other need besides printing "111" to a screen) we would have to scrap the entire computer and build a new one with different code written on that read-only BIOS memory. (If we're lu ...
... then if this memory for the BIOS is read-only, that means if we ever want to change the software (as if there were any other need besides printing "111" to a screen) we would have to scrap the entire computer and build a new one with different code written on that read-only BIOS memory. (If we're lu ...
Replication, Load-balancing, and QoS
... printf ("Error in openning the output file\n"); return; ...
... printf ("Error in openning the output file\n"); return; ...
Operating System Services
... into memory and to run that program, end execution, either normally or abnormally (indicating error) 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 a ...
... into memory and to run that program, end execution, either normally or abnormally (indicating error) 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 a ...
Solution
... from one user to another. Instead of having a job defined by spooled card images, each program reads its next control card from the terminal, and output is normally printed immediately to the screen. d. Real time. Often used in a dedicated application, this system reads information from sensors and ...
... from one user to another. Instead of having a job defined by spooled card images, each program reads its next control card from the terminal, and output is normally printed immediately to the screen. d. Real time. Often used in a dedicated application, this system reads information from sensors and ...
System Calls
... System calls: The mechanism used by an application program to request service from the operating system. System calls often use a special machine code instruction which causes the processor to change mode (e.g. to "supervisor mode" or "protected mode"). This allows the OS to perform restricted actio ...
... System calls: The mechanism used by an application program to request service from the operating system. System calls often use a special machine code instruction which causes the processor to change mode (e.g. to "supervisor mode" or "protected mode"). This allows the OS to perform restricted actio ...
Document
... As RAM capacity increases (doubles every 1.5 years approximately), so too, does program size, including the size of the operating system. A simple solution to this problem is to use disk storage to store portions of programs not currently required by the processor and to swap information between dis ...
... As RAM capacity increases (doubles every 1.5 years approximately), so too, does program size, including the size of the operating system. A simple solution to this problem is to use disk storage to store portions of programs not currently required by the processor and to swap information between dis ...
I. Course code and Title OPERATING SYSTEM CONCEPTS II
... This course covers the basic concepts of Operating Systems. It includes the following topics Overview: Operating System Role, Purpose and Functionality; Computing Environments: Single User, Multi User, Multiple Simultaneous Computations; Goals of Parallelism (e.g., Throughput) versus Concurrency (e. ...
... This course covers the basic concepts of Operating Systems. It includes the following topics Overview: Operating System Role, Purpose and Functionality; Computing Environments: Single User, Multi User, Multiple Simultaneous Computations; Goals of Parallelism (e.g., Throughput) versus Concurrency (e. ...
now
... Often, more information is required than simply identity of desired system call ◦ Exact type and amount of information vary according to OS and call ...
... Often, more information is required than simply identity of desired system call ◦ Exact type and amount of information vary according to OS and call ...
Operating-System Structures - Stanford Computer Graphics
... memory and to run it. I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between pro ...
... memory and to run it. I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between pro ...
virtual machine
... and the operating system kernel as though they were all hardware • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory ...
... and the operating system kernel as though they were all hardware • A virtual machine provides an interface identical to the underlying bare hardware • The operating system creates the illusion of multiple processes, each executing on its own processor with its own (virtual) memory ...
Slide 1
... Components of an operating system Another component of the kernel consists of a collection of device driver, which are the software that communicate the controllers to carry out operations on the peripheral devices attached to the machine. Each device driver is uniquely assigned for its particula ...
... Components of an operating system Another component of the kernel consists of a collection of device driver, which are the software that communicate the controllers to carry out operations on the peripheral devices attached to the machine. Each device driver is uniquely assigned for its particula ...
No Slide Title
... Network operating systems Virtual environment treats resources physically residing on the computer in the same way as resources available through ...
... Network operating systems Virtual environment treats resources physically residing on the computer in the same way as resources available through ...
Introduction
... • Data is for memory that is “static”, like global variables, etc. • Text (code) is program machine code. • How about threads? • Is it all writable? Executable? Readable? ...
... • Data is for memory that is “static”, like global variables, etc. • Text (code) is program machine code. • How about threads? • Is it all writable? Executable? Readable? ...
Operating Systems Security
... Linux, DOS, OS X • 32-bit Linux: Lower 3GB for user code/data, top 1GB for kernel • Corresponds to x86 privilege ring transitions • Windows and OS X similar • DOS had no such fence, any process could alter DOS and viruses could spread by hooking DOS interrupt handlers via kernel changes ...
... Linux, DOS, OS X • 32-bit Linux: Lower 3GB for user code/data, top 1GB for kernel • Corresponds to x86 privilege ring transitions • Windows and OS X similar • DOS had no such fence, any process could alter DOS and viruses could spread by hooking DOS interrupt handlers via kernel changes ...
Acorn MOS
Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non-reentrant.Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range.The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS.Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space.Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.