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diff --git a/sag-0.6.1-www/Invisible/sag-0.6/node9.html b/sag-0.6.1-www/Invisible/sag-0.6/node9.html new file mode 100644 index 0000000..255e964 --- /dev/null +++ b/sag-0.6.1-www/Invisible/sag-0.6/node9.html @@ -0,0 +1,65 @@ +<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> +<!--Converted with LaTeX2HTML 96.1-h (September 30, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --> +<HTML> +<HEAD> +<TITLE>init</TITLE> +<META NAME="description" CONTENT="init"> +<META NAME="keywords" CONTENT="sag"> +<META NAME="resource-type" CONTENT="document"> +<META NAME="distribution" CONTENT="global"> +<LINK REL=STYLESHEET HREF="sag.css"> +</HEAD> +<BODY LANG="EN" > + <A NAME="tex2html409" HREF="node10.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="./next_motif.gif"></A> <A NAME="tex2html407" HREF="node8.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="./up_motif.gif"></A> <A NAME="tex2html401" HREF="node8.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="./previous_motif.gif"></A> <A NAME="tex2html411" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="./contents_motif.gif"></A> <A NAME="tex2html412" HREF="node114.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="./index_motif.gif"></A> <BR> +<B> Next:</B> <A NAME="tex2html410" HREF="node10.html">Logins from terminals</A> +<B>Up:</B> <A NAME="tex2html408" HREF="node8.html">Major services in a </A> +<B> Previous:</B> <A NAME="tex2html402" HREF="node8.html">Major services in a </A> +<BR> <P> +<A NAME="308"> </A><H2><A NAME="SECTION00331000000000000000"><tt>init</tt></A></H2> +<P> + The single most important service in a UNIX system is provided + by <tt>init</tt><A NAME="310"> </A>. <tt>init</tt><A NAME="312"> </A> is started as the first process of + every UNIX system, as the last thing the kernel does when it + boots. When <tt>init</tt><A NAME="314"> </A> starts, it continues the boot process + by doing various startup chores (checking and mounting filesystems, + starting daemons, etc). +<A NAME="166"> </A> +<A NAME="167"> </A> +<A NAME="168"> </A> +<P> + The exact list of things that <tt>init</tt><A NAME="316"> </A> + does depends on which flavor it is; there are several to choose + from. <tt>init</tt><A NAME="318"> </A> + usually provides the concept of <b>single user mode</b>, in which + no one can log in and <tt>root</tt><A NAME="321"> </A> uses a shell at the console; the usual + mode is called <b>multiuser mode</b>. + Some flavors generalize this as <b>run levels</b>; single and + multiuser modes are considered to be two run levels, and there + can be additional ones as well, for example, to run X on the + console. +<A NAME="175"> </A> +<A NAME="176"> </A> +<A NAME="177"> </A> +<A NAME="178"> </A> +<P> + In normal operation, <tt>init</tt><A NAME="325"> </A> makes sure <tt>getty</tt><A NAME="327"> </A>s are + working (to allow users to log in), and to + adopt orphan processes (processes whose parent has died; in + UNIX <em>all</em> processes <em>must</em> be in a single tree, + so orphans must be adopted). +<P> + When the system is shut down, it is <tt>init</tt><A NAME="329"> </A> that is in charge + of killing all + other processes, unmounting all filesystems and stopping the processor, + along with anything else it has been configured to do. +<A NAME="184"> </A> +<A NAME="185"> </A> +<A NAME="186"> </A> +<P> +<BR> <HR> +<P><ADDRESS> +<I>Lars Wirzenius <BR> +Sat Nov 15 02:32:11 EET 1997</I> +</ADDRESS> +</BODY> +</HTML> |