System calls: Difference between revisions
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[[file:resource.png|right|frame|Resource Management<ref>http://www.flaticon.com/</ref>]] | [[file:resource.png|right|frame|Resource Management<ref>http://www.flaticon.com/</ref>]] | ||
[[File:Operating system placement.svg.png|frame|System calls happen between the application and operating system layer part of this diagram.|right]] | |||
[[File:System call.png|500px|frame|This diagram shows a simplified representation of a system call<ref>https://www.guru99.com/system-call-operating-system.html</ref>.|right]] | |||
In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the kernel of the operating system on which it is executed. This may include hardware-related services (for example, accessing a hard disk drive), creation and execution of new processes, and communication with integral kernel services such as process scheduling. System calls provide an essential interface between a process and the operating system.<ref>https://en.wikipedia.org/wiki/System_call</ref> | In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the kernel of the operating system on which it is executed. This may include hardware-related services (for example, accessing a hard disk drive), creation and execution of new processes, and communication with integral kernel services such as process scheduling. System calls provide an essential interface between a process and the operating system.<ref>https://en.wikipedia.org/wiki/System_call</ref> | ||
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#*get/set file permissions | #*get/set file permissions | ||
== Video == | |||
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<iframe width="560" height="315" src="https://www.youtube.com/embed/xHu7qI1gDPA" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> | |||
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Latest revision as of 09:53, 24 November 2020
Resource Management[1]
System calls happen between the application and operating system layer part of this diagram.
This diagram shows a simplified representation of a system call[2].
In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the kernel of the operating system on which it is executed. This may include hardware-related services (for example, accessing a hard disk drive), creation and execution of new processes, and communication with integral kernel services such as process scheduling. System calls provide an essential interface between a process and the operating system.[3]
Categories of system calls can be grouped as noted below[4]:
- Process control
- create process (for example,
fork (operating system)|forkon Unix-like systems, orNtCreateProcessin the Windows NT, Native API) - Kill (command)|terminate process
- Loader (computing)|load, Exec (operating system)|execute
- get/set process attributes
- Wait (operating system)|wait for time, wait event, Signal (computing)|signal event
- Dynamic memory allocation|allocate and Garbage collection (computer science)|free memory
- create process (for example,
- File management
- create file, delete file
- open, close
- read, write, reposition
- get/set file attributes
- Device management
- request device, release device
- read, write, reposition
- get/set device attributes
- logically attach or detach devices
- Information maintenance
- get/set time or date
- get/set system data
- get/set process, file, or device attributes
- Communication
- create, delete communication connection
- send, receive messages
- transfer status information
- attach or detach remote devices
- Protection
- get/set file permissions
Video