Daemon - Revision history

Franks at 01:57, 18 August 2010

2010-08-18T01:57:19Z

← Older revision		Revision as of 18:57, 17 August 2010
Line 6:		Line 6:

	3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.		3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.

			== Example ==

			This example checks if port 22 is listening in netstat, and if not, it runs /etc/rc.d/sshd.

			#!/bin/bash
			chk=`netstat -an \| grep -c :22`
			if [ "$chk" = "0" ]
			then
			echo "sshd is down, start this mofo...";
			/etc/rc.d/sshd restart
			fi

Pbug at 16:19, 6 October 2005

2005-10-06T16:19:32Z

← Older revision		Revision as of 09:19, 6 October 2005
Line 3:		Line 3:
	1. It is the process of daemonizing a program there is a C function for this called daemon(3).		1. It is the process of daemonizing a program there is a C function for this called daemon(3).

	2. A daemon is a program that runs a service on the system, it is not tied to a terminal and may only write reports to [[syslog]] or another logging mechanism. There is [[SMTP]] daemons such as [[sendmail]] that manage all mail operations, or the inetd superserver which manages a number of services such as chargen and ftp. A daemon orphans itself from the parent process and selects [[init]] (process 1) as its parent. [[Stdin]], [[Stdout]] and [[Stderr]] are reattached to /dev/null. A daemon is in it's own [[session]] and is its own [[process group]]. Daemons that needed to run as [[root]] in order to make use of restricted system calls historically stayed running as [[root]]. This has changed in modern implementations where [[privilege ~~escalation~~]] or [[privilege seperation]] is used in order to ensure security.		2. A daemon is a program that runs a service on the system, it is not tied to a terminal and may only write reports to [[syslog]] or another logging mechanism. There is [[SMTP]] daemons such as [[sendmail]] that manage all mail operations, or the inetd superserver which manages a number of services such as chargen and ftp. A daemon orphans itself from the parent process and selects [[init]] (process 1) as its parent. [[Stdin]], [[Stdout]] and [[Stderr]] are reattached to /dev/null. A daemon is in it's own [[session]] and is its own [[process group]]. Daemons that needed to run as [[root]] in order to make use of restricted system calls historically stayed running as [[root]]. This has changed in modern implementations where [[privilege revocation]] or [[privilege seperation]] is used in order to ensure security.

	3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.		3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.

Pbug at 15:43, 6 October 2005

2005-10-06T15:43:09Z

← Older revision		Revision as of 08:43, 6 October 2005
Line 3:		Line 3:
	1. It is the process of daemonizing a program there is a C function for this called daemon(3).		1. It is the process of daemonizing a program there is a C function for this called daemon(3).

	2. A daemon is a program that runs a service on the system, it is not tied to a terminal and may only write reports to [[syslog]] or another logging mechanism. There is SMTP daemons such as sendmail that manage all mail operations, or the inetd superserver which manages a number of services such as chargen and ftp. A daemon orphans itself from the parent process and selects [[init]] (process 1) as its parent.		2. A daemon is a program that runs a service on the system, it is not tied to a terminal and may only write reports to [[syslog]] or another logging mechanism. There is [[SMTP]] daemons such as [[sendmail]] that manage all mail operations, or the inetd superserver which manages a number of services such as chargen and ftp. A daemon orphans itself from the parent process and selects [[init]] (process 1) as its parent. [[Stdin]], [[Stdout]] and [[Stderr]] are reattached to /dev/null. A daemon is in it's own [[session]] and is its own [[process group]]. Daemons that needed to run as [[root]] in order to make use of restricted system calls historically stayed running as [[root]]. This has changed in modern implementations where [[privilege escalation]] or [[privilege seperation]] is used in order to ensure security.

	3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.		3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.

Pbug at 13:16, 6 October 2005

2005-10-06T13:16:25Z

← Older revision		Revision as of 06:16, 6 October 2005
Line 2:		Line 2:

	1. It is the process of daemonizing a program there is a C function for this called daemon(3).		1. It is the process of daemonizing a program there is a C function for this called daemon(3).

	2. A daemon is a program that runs a service on the system, it is not tied to a terminal and may only write reports to [[syslog]] or another logging mechanism. There is SMTP daemons such as sendmail that manage all mail operations, or the inetd superserver which manages a number of services such as chargen and ftp. A daemon orphans itself from the parent process and selects [[init]] (process 1) as its parent.		2. A daemon is a program that runs a service on the system, it is not tied to a terminal and may only write reports to [[syslog]] or another logging mechanism. There is SMTP daemons such as sendmail that manage all mail operations, or the inetd superserver which manages a number of services such as chargen and ftp. A daemon orphans itself from the parent process and selects [[init]] (process 1) as its parent.

	3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.		3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.

Pbug at 13:15, 6 October 2005

2005-10-06T13:15:53Z

New page

A daemon represents three things:

1. It is the process of daemonizing a program there is a C function for this called daemon(3).
2. A daemon is a program that runs a service on the system, it is not tied to a terminal and may only write reports to [[syslog]] or another logging mechanism. There is SMTP daemons such as sendmail that manage all mail operations, or the inetd superserver which manages a number of services such as chargen and ftp. A daemon orphans itself from the parent process and selects [[init]] (process 1) as its parent.
3. BSD's original mascot, looks like a devil and should not be confused with a demon (which is evil). The mascot has horns, holds a trident (or fork) in its hands and has a tail. It wears green sneakers (converse basketball sneakers probably) and is seen in early drawings as chasing a golden orb. [[FreeBSD]] uses this mascot extensively. [[OpenBSD]] has replaced the daemon mascot with [[puffy]] the blowfish. If you look closely on a picture of Puffy though the tail often looks like the silhouette of a daemon's head.