daemon

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daemon

[′dē·mən]
(computer science)
In Unix, a program that runs in the background, such as a server.

daemon

(operating system)
/day'mn/ or /dee'mn/ (From the mythological meaning, later rationalised as the acronym "Disk And Execution MONitor") A program that is not invoked explicitly, but lies dormant waiting for some condition(s) to occur. The idea is that the perpetrator of the condition need not be aware that a daemon is lurking (though often a program will commit an action only because it knows that it will implicitly invoke a daemon).

For example, under ITS writing a file on the LPT spooler's directory would invoke the spooling daemon, which would then print the file. The advantage is that programs wanting files printed need neither compete for access to, nor understand any idiosyncrasies of, the LPT. They simply enter their implicit requests and let the daemon decide what to do with them. Daemons are usually spawned automatically by the system, and may either live forever or be regenerated at intervals.

Unix systems run many daemons, chiefly to handle requests for services from other hosts on a network. Most of these are now started as required by a single real daemon, inetd, rather than running continuously. Examples are cron (local timed command execution), rshd (remote command execution), rlogind and telnetd (remote login), ftpd, nfsd (file transfer), lpd (printing).

Daemon and demon are often used interchangeably, but seem to have distinct connotations (see demon). The term "daemon" was introduced to computing by CTSS people (who pronounced it /dee'mon/) and used it to refer to what ITS called a dragon.

daemon

Pronounced "dee-mun" as in the word for devil, as well as "day-mun," a daemon is a Unix/Linux program that executes in the background ready to perform an operation when required. Functioning like an extension to the operating system, a daemon is usually an unattended process that is initiated at startup. Typical daemons are print spoolers and email handlers or a scheduler that starts up another process at a designated time. The term comes from Greek mythology, meaning "guardian spirit." See agent and mailer-daemon.
References in periodicals archive ?
Joint operatives from PS-6 Drug Enforcement Unit, and Philippine Drug Enforcement Agency conducted a drug bust against Daimon near his house along Lower Jasmin Street at around 11:30 p.
After the transaction, Daimon sensed the presence of other policemen and that the buyer was an undercover operative,' Eleazar said.
es el Daimon encarnado en el ganador de la prueba que, en buena medida, representa al objeto de culto de la conmemoracion.
It is with great pleasure that we announce Daimon Hall's new position," said Luis Miguel Sampaio, CEO of MOG.
It also, however, presents a certain difficulty: Apollonius may now be worthy to be called a daimon incarnate, but his previous incarnation appears, for all its Protean attributes, to have been as a thoroughly ordinary human being, whose greatest achievement was merely refusing a bribe (VA 3,24).
By tradition daimons appear in unexpected forms, and that was certainly true of Freud's.
The ur-philosopher, she solemnly informs us, "famously believed that he had a daimon who spoke wisdom to him from afar.
welcome to me for a symbolic reason: I could accept it as if from the ironic ghost of Burns (too long loved and too well known for any misunderstanding) and keep in mind his warning against those who try to court the daimon through scholarship (p.
La intervencion del daimon muestra que ningun hombre puede conocerse a si mismo desde la autosuficiencia de su alma.
Esta nocion rescata el misterium tremendum que significa el daimon de la poesia desde el pensamiento platonico, por cuanto el poeta se abandona al arrebato y a la posesion erotica para vivir su experiencia inaudita y extraordinaria; prueba de ello es la famosa carta de 1965, que ya nos reprodujo Juan Lizcano.
The spiritual dimension celebrates that there is always something more, whether you call this mystery, awe, wonder, God, Higher-Power, or daimon.
Ippei Takahashi, Ayumu Saito, Goro Daimon, Takashi Sasano.