87 lines
2.8 KiB
Plaintext
87 lines
2.8 KiB
Plaintext
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==== SERVICE LIST ==============================================================
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overlordd root process, manages all system-level services
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launchd launches executables
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nsd manages the system namespace (aka where all filesystems are
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mounted)
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lockdownd implements security and authentication
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sessiond manager and root process for a user session
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airportd manages sockets and network communications.
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emdevd host process for device drivers, one instance per system, hosts
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*all* devices
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seatd Manages and controls access to monitor and peripheral devices.
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fsd host process for filesystem driver, one instance per mounted
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filesystem
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==== TASK HIERARCHY ============================================================
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backboardd
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+--launchd
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+--nsd
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+--lockdownd
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+--deviced
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+--airportd
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+--sysfsd
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+--seatd
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+--sessiond
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| +--window-manager
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| +--file-browser
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| +--web-browser
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+--sessiond
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| +--fbterm
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| +--bshell
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| +--vim
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+--e2fsd
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+--fatfsd
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==== SERVICE DETAILS ===========================================================
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## BACKBOARDD ####
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* Root task (ID 1) created by the kernel during boot
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* manages the startup and lifecycle of all system-level services
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* Every task is provided with a handle to backboardd as part of the initial
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task environment
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* Backboardd can be used to gain access to certain system-level services, such
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as the namespace and task launcher
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## LAUNCHD ####
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* Task creation service
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* Accepts requests from clients to run executable files
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## NSD ####
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* Manages the system namespace
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* Filesystems can be mounted in the system namespace to make them visible to
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clients.
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## LOCKDOWND ####
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* Manages security and authentication
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* Provides security tokens that can be associated with privileges and used
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for authorisation.
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## SESSIOND ####
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* Root process for user login sessions.
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* All child tasks receive a connection to the session controller.
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* Holds session-wide data
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## DEVICED ####
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* Hosts all device drivers.
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* Device drivers are implemented as shared libraries that are loaded into
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the device server at runtime.
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* Also hosts the device filesystem (usually mounted at /dev)
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## SEATD ####
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* Manages 'seats'.
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* A seat is all of the peripherals that a user needs to interact with the
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system. Includes the monitor, keyboard, and mouse.
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* Allows multiple tasks to access a single seat at once. The user can use a
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special keyboard shortcut to switch between tasks.
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## AIRPORTD ####
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* Manages remote communications.
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* All open sockets are represented internally as connections to airportd.
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* Supports loadable modules, which provide support for different network features,
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such as unix sockets, internet sockets, and passing messages between remote machines.
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