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It also includes the programs such as update-alternatives and start-stop-daemon. The install-info program used to be included as well, but was later removed [7] as it is now developed and distributed separately. [8] The Debian package "dpkg-dev" includes the numerous build tools described below.
By default, OpenRC uses a modified version of start-stop-daemon for daemon management. [10] Init scripts share similarities with scripts used in sysvinit, but offer several features to simplify their creation. Scripts are assumed to have start(), stop() and status(); and the system uses variables already declared to create the default functions ...
opcontrol is used to start and stop the daemon, which collects profiling data. This data is periodically saved to the /var/lib/oprofile/samples directory. opreport shows basic profiling data. opannotate can produce annotated sources or assembly. opgprof converts from oprofile data into gprof-compatible format. [4] Example:
The term was coined by the programmers at MIT's Project MAC.According to Fernando J. Corbató, who worked on Project MAC around 1963, his team was the first to use the term daemon, inspired by Maxwell's demon, an imaginary agent in physics and thermodynamics that helped to sort molecules, stating, "We fancifully began to use the word daemon to describe background processes that worked ...
Once the kernel has started, it starts the init process, [20] a daemon which then bootstraps the user space, for example by checking and mounting file systems, and starting up other processes. The init system is the first daemon to start (during booting) and the last daemon to terminate (during shutdown).
A daemon is a type of background process designed to run continually in the background, waiting for event(s) to occur or condition(s) to be met. [9] When launched with the daemon function, daemons are disassociated from their parent terminal.
launchd has two main tasks. The first is to boot the system, and the second is to load and maintain services.. Here is a simplified view of the Mac OS X Tiger system startup on a PowerPC Mac (on an Intel Mac, EFI replaces Open Firmware and boot.efi replaces BootX):
The line printer daemon that manages printer spooling. nfsd [3] Processes NFS operation requests from client systems. Historically each nfsd daemon handled one request at a time, so it was normal to start multiple copies. ntpd Network Time Protocol daemon that manages clock synchronization across the network. xntpd implements the version 3 ...