Virtual device


Virtual device

A virtual device in Unix is a file such as :/dev/null or :/dev/urandom, that is treated as a device, as far as user level software is concerned, but is generated by the kernel without reference to hardware.

For instance when /dev/null is written to, the kernel tells the program it wrote everything to it (without actually writing it anywhere), and when read from, the reading program is told that it has reached the end of the file. It is a device file (it can be made with mknod for instance), but does not reference any hardware.

DOS-, Windows- and OS/2-like operating systems define the NUL device that performs a similar function (but is implemented as part of the file name processing – no actual file exists by that name).

ru:/dev


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Virtual Device —   [engl.], virtuelles Gerät …   Universal-Lexikon

  • virtual device — virtualusis įrenginys statusas T sritis automatika atitikmenys: angl. virtual device vok. virtuelle Einheit, f rus. виртуальное устройство, n pranc. dispositif virtuel, m …   Automatikos terminų žodynas

  • virtual device — virtualusis įrenginys statusas T sritis informatika apibrėžtis Darbui tinkamas fizinio įrenginio modelis. Pavyzdžiui, ↑virtualusis serveris, ↑virtualusis diskas, ↑virtualioji mašina. atitikmenys: angl. virtual device ryšiai: dar žiūrėk –… …   Enciklopedinis kompiuterijos žodynas

  • Virtual Device Driver — Virtual Device Driver,   virtueller Gerätetreiber …   Universal-Lexikon

  • virtual device driver — virtualioji įtaisų tvarkyklė statusas T sritis informatika apibrėžtis Įtaisų tvarkyklės komponentas, palaikantis tiesioginį ryšį su aparatūros komponentais žemo lygio komandomis ir signalais. Naudojama „Windows“ operacinėje sistemoje. Žymima VxD… …   Enciklopedinis kompiuterijos žodynas

  • Virtual device driver — VxD Pour les articles homonymes, voir VXD (homonymie). Pour les utilisateurs de Microsoft Windows, un VxD est un virtual device driver (pilote de périphérique virtuel). Un VxD s exécute sous les systèmes d exploitation Windows 3.x, Microsoft… …   Wikipédia en Français

  • Virtual DOS machine — (VDM) is Microsoft s technology that allows running legacy DOS and 16 bit Windows programs on Intel 80386 or higher computers when there is already another operating system running and controlling the hardware. Contents 1 Overview 2 NTVDM 3… …   Wikipedia

  • Device driver — Operating systems Common features …   Wikipedia

  • Virtual DOS — Machine DOS virtuelle Virtual DOS machine (Machine DOS virtuelle) (VDM) est le nom des technologies de Microsoft permettant d exécuter des programmes MS DOS sur les ordinateurs équipés de processeurs Intel 80386 ou plus récents quand il y a un… …   Wikipédia en Français

  • Virtual DOS Machine — Machine DOS virtuelle Virtual DOS machine (Machine DOS virtuelle) (VDM) est le nom des technologies de Microsoft permettant d exécuter des programmes MS DOS sur les ordinateurs équipés de processeurs Intel 80386 ou plus récents quand il y a un… …   Wikipédia en Français


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.