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A high-level overview of the Linux kernel's system call interface, which handles communication between its various components and the userspace. In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the operating system [a] on which it is executed.
sysctl is a software mechanism in some Unix-like operating systems that reads and modifies the attributes of the system kernel such as its version number, maximum limits, and security settings. [1] It is available both as a system call for compiled programs, and an administrator command for interactive use and scripting.
The section System Calls [2] of the Newlib documentation describes how it can be used with many operating systems.Its primary use is on embedded systems that lack any kind of operating system; in that case it calls a board support package that can do things like write a byte of output on a serial port, or read a sector from a disk or other memory device.
It was started in the 1980s by the Free Software Foundation (FSF) for the GNU operating system. glibc is free software released under the GNU Lesser General Public License. [3] The GNU C Library project provides the core libraries for the GNU system, as well as many systems that use Linux as the kernel.
Advanced Linux Sound Architecture could set system calls, which are not part of the POSIX specifications; The system calls futex (fast userspace mutex), epoll, splice, dnotify, fanotify, and inotify have been exclusive to the Linux kernel so far. The system call getrandom was introduced in version 3.17 of the Linux kernel mainline [12]
epoll is a Linux kernel system call for a scalable I/O event notification mechanism, first introduced in version 2.5.45 of the Linux kernel. [1] Its function is to monitor multiple file descriptors to see whether I/O is possible on any of them.
select is a system call and application programming interface (API) in Unix-like and POSIX-compliant operating systems for examining the status of file descriptors of open input/output channels. [1] The select system call is similar to the poll facility introduced in UNIX System V and later operating systems.
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