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An exit, when applied to computing, is when a process terminates execution. More generally, an exit in a multithreading environment means that a thread of execution has stopped running. The operating system reclaims resources (memory, files, etc.) that were used by the process. The process is said to be a dead process after it terminates. Originally, the word computing was synonymous with counting and calculating, and a science that deals with the original sense of computing mathematical calculations. ...
In computing, a process is, roughly speaking, a task being run by a computer, often simultaneously with many other tasks. ...
Many programming languages, operating systems, and other software development environments support what are called threads of execution. ...
A thread in computer science is short for a thread of execution. ...
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A resource, also referred to as system resource, is any physical or virtual system component of a computer system with limited availability. ...
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A computer file is a collection of information that is stored in a computer system and can be identified by its full path name. ...
In a multitasking computer system, processes may occupy a variety of states. ...
Under Unix and Unix-like operating systems, every process is starting by a parent process, when the parent executes a fork system call. The parent process may then wait for the child process to terminate, or may continue execution (possibly forking off other child processes). When the child process terminates ("dies"), either normally by calling exit or abnormally due to a fatal error or signal (e.g., SIGTERM, SIGINT, SIGKILL), an exit status is returned to the kernel and a SIGCHLD signal is sent to the parent process. The exit status can be retrieved by the parent process. Unix or UNIX is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ...
A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification. ...
In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. ...
A parent process is a computer process that has created one or more child processes. ...
A fork, when applied to computing is when a process creates a copy of itself, which then acts as a child of the original process, now called the parent. More generally, a fork in a multithreading environment means that a thread of execution is duplicated. ...
In computing, a system call is the mechanism used by an application program to request service from the operating system, or more specifically, the operating system kernel. ...
A child process is a computer process created by another process (the parent process). ...
An ABEND (or abnormal end or abend) is an abnormal termination of software, a Crash or lossage. ...
A fatal error is typically related to computers. ...
A signal is an asynchronous event transmitted between one process and another. ...
SIGTERM is the default signal sent to a process by the kill or killall commands. ...
SIGINT stands for SIGnals INTelligence, which is intelligence-gathering by interception of signals, whether by radio interception or other means. ...
In Unix and similar operating systems (such as Linux, BSD, OS-9 and UniFLEX) SIGKILL stands for Signal Kill. ...
The exit status of a process in computer programming is a small number passed from a child process to a parent process when it is done executing a specific task delegated. ...
In UNIX, a process can have children. ...
Most operating systems allow the terminating process to provide a specific exit status to the system, which is made available to the parent process. Typically this is a small integer value, although some operating systems (e.g., Plan 9) allow a character string to be specified. The exit status of a process in computer programming is a small number passed from a child process to a parent process when it is done executing a specific task delegated. ...
Plan 9 is an operating system descended from Unix and developed by Bell Laboratories. ...
In various branches of mathematics and computer science, strings are sequences of various simple objects (symbols, tokens, characters, etc. ...
The exit operation typically performs clean-up operations within the process space before returning control back to the operating system. Some systems and programming languages allow user subroutines to be registered so that they are invoked at program termination before the process actually terminates for good. As the final step of termination, a primitive system exit call is invoked, informing the operation system that the process has terminated and allows it to reclaim the resources used by the process. Other listings of programming languages are: Categorical list of programming languages Generational list of programming languages Chronological list of programming languages Note: Esoteric programming languages have been moved to the separate List of esoteric programming languages. ...
In computer science, a subroutine (function, procedure, or subprogram) is a sequence of code which performs a specific task, as part of a larger program, and is grouped as one, or more, statement blocks; such code is sometimes collected into software libraries. ...
Some operating systems handle a child process whose parent process has terminated in a special manner. Such an orphan process becomes a child of a special root process, which then waits for the child process to terminate. Likewise, a similar strategy is used to deal with a zombie process, which is a child process that has terminated but whose exit status is ignored by its parent process. Such a process becomes the child of a special parent process, which retrieves the child's exit status and allows the operating system to complete the termination of the dead process. Dealing with these special cases keeps the system process table in a consistent state. A orphan process is a computer process whose Parent process has finished or terminated. ...
init (short for initialization) is the program on Unix and Unix-like systems which spawns all other processes. ...
On Unix operating systems, a zombie process or defunct process is a process that has completed execution but still has an entry in the process table, allowing the process that started it to read its exit status. ...
In computing, a process is a running instance of a program, including all variables and other state. ...
Examples
The following programs do nothing but terminate and return a success status to the system.
C: Wikibooks has a book on the topic of C Programming The C programming language (often, just C) is a general-purpose, procedural, imperative computer programming language developed in the early 1970s by Dennis Ritchie for use on the Unix operating system. ...
#include <stdlib.h> int main(void) { exit(EXIT_SUCCESS); } C++: C++ (generally pronounced see plus plus) is a general-purpose programming language. ...
#include <cstdlib> int main(void) { std::exit(EXIT_SUCCESS); } COBOL: COBOL is a third-generation programming language, and one of the oldest programming languages still in active use. ...
IDENTIFICATION DIVISION. PROGRAM-ID. SUCCESS-PROGRAM. PROCEDURE DIVISION. MAIN. MOVE ZERO TO RETURN-CODE. END PROGRAM. Java: Java is an object-oriented programming language developed by James Gosling and colleagues at Sun Microsystems in the early 1990s. ...
import java.lang.System; public class Success { public static void main(String[] args) { System.exit(0); } } Microsoft DOS: The Microsoft Corporation, commonly known as just Microsoft, (NASDAQ: MSFT, HKSE: 4338) is a multinational computer technology corporation with global annual sales of US$44. ...
‹ The template below has been proposed for deletion. ...
set ERRORLEVEL=0 exit Perl: Programming Republic of Perl logo Perl, also Practical Extraction and Report Language (a backronym, see below), is a programming language released by Larry Wall on December 18, 1987 that borrows features from C, sed, awk, shell scripting (sh), and (to a lesser extent) from many other programming languages. ...
#!/bin/perl exit; Unix shell: Unix or UNIX is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ...
The Bourne shell, or sh, was the default Unix shell of Unix Version 7, and replaced the Thompson shell, whose executable file had the same name, sh. ...
#!/bin/sh exit 0
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