About: Exec (system call)

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In computing, exec is a functionality of an operating system that runs an executable file in the context of an already existing process, replacing the previous executable. This act is also referred to as an overlay. It is especially important in Unix-like systems, although it exists elsewhere. As no new process is created, the process identifier (PID) does not change, but the machine code, data, heap, and stack of the process are replaced by those of the new program.

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rdf:type	software yago:WikicatUnixSUS2008Utilities yago:Abstraction100002137 yago:Company108058098 yago:Group100031264 yago:Institution108053576 yago:Organization108008335 yago:YagoLegalActor yago:YagoLegalActorGeo yago:YagoPermanentlyLocatedEntity yago:Service108186047 yago:SocialGroup107950920 yago:Utility108185758
rdfs:label	Exec (systémové volání) (cs) Exec (Unix) (de) Exec (system call) (en) Exec (Unix) (it) Exec (ja) Exec (informatica) (nl)
rdfs:comment	exec je v informatice speciální systémové volání poskytované unixovým jádrem operačního systému. Jeho vyvoláním je kód běžícího procesu kompletně nahrazen programem, který je předán jako parametr. Zachováno zůstane PID a prostředí procesu (otevřené soubory, PCB apod.), avšak před jeho voláním je pro otevřené soubory nutné vyprázdnit buffery a cache. Volání exec je typicky využíváno po volání fork při vytváření nových procesů. (cs) exec はUnix系オペレーティングシステムにおける関数群で、関数の引数として渡されたプログラムで動作中の当該プロセスを完全に置換する機能を有する。新たなプロセスを生成するわけではないので、プロセス識別子 (PID) は変化しないが、プロセスの仮想空間上のスタック、ヒープ、データなどは全て新たなものに置換される。 (ja) Exec è una funzione di sistema presente nella libreria standard del C del progetto GNU, la GNU C Library. (it) Exec (van execute, "voer uit!") concept uit de informatica en is (onder de naam execve) deel van de POSIX API en vervangt het programma dat het huidige proces uitvoert. Er wordt dus geen nieuw proces gestart, maar het huidige proces start een ander programma. Om een ander programma te starten in een apart proces wordt dan ook een combinatie fork/exec gebruikt. (nl) In computing, exec is a functionality of an operating system that runs an executable file in the context of an already existing process, replacing the previous executable. This act is also referred to as an overlay. It is especially important in Unix-like systems, although it exists elsewhere. As no new process is created, the process identifier (PID) does not change, but the machine code, data, heap, and stack of the process are replaced by those of the new program. (en) exec* ist eine Gruppe von Systemcalls unter Unix und unixähnlichen Betriebssystemen. Ihnen allen ist gemeinsam, einen neuen Prozess in dem Environment eines bestehenden Prozesses zu starten und damit diesen zu ersetzen. (Dieser Vorgang wird auch Overlay genannt.) Im POSIX-Standard werden dazu folgende Funktionsprototypen in der Headerdatei unistd.h definiert: Dabei bedeuten: Beide beteiligten Arrays, envp[] und argv[] enthalten Pointer auf nullterminierte Strings. Das letzte Element des Arrays ist konventionell ein Nullpointer, womit das Ende des Arrays angezeigt wird. (de)
dct:subject	Process.h System calls Process (computing) Unix SUS2008 utilities POSIX
Wikipage page ID	4634262 (xsd:integer)
Wikipage revision ID	1104687209 (xsd:integer)
Link from a Wikipage to another Wikipage	Process.h Primary memory Null-terminated string Memory address Process.h Process identifier Unix Unix-like Unix shell Interpreter (computing) Command-line interface Compiler Computer multitasking Null pointer Shell builtin Environment variable Linux kernel MS-DOS Computing PATH (variable) Pointer (computer programming) Spawn (computing) Standard streams C (programming language) Unistd.h DOS DOS MZ executable Data (computing) POSIX Parent process System calls Fork (system call) Fork–exec Machine code Process (computing) Heap (programming) Process (computing) Unix SUS2008 utilities High-level programming language Wrapper function Wrapper library POSIX File descriptor OS/360 and successors Operating system Operating system shell Redirection (computing) Chain loading Shared memory (interprocess communication) System call Virtual machine Scripting language Virtual memory Programming language Exit (system call) Exit status Fcntl Run-time stack Function (programming) Vfork Errno Executable file
sameAs	Exec (system call) Exec (system call) Exec (system call) Exec (system call) Exec (system call) Exec (system call)

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