60 lines
2.6 KiB
Plaintext
Executable File
60 lines
2.6 KiB
Plaintext
Executable File
#ident "@(#)README 1.8 93/03/01 SMI" /* SVr4.0 1.4.1.1 */
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Copyright (c) 1993, by Sun Microsystems, Inc.
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This file describes the general mechanism for installing and executing
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initialization and termination scripts used to implement init state
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changes.
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/etc/init.d contains initialization and termination scripts for
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changing init states. These scripts are linked when appropriate to
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files in the rc?.d directories.
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File names in rc?.d directories are of the form [SK]nn<init.d filename>
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where 'S' means start this job, 'K' means kill this job, and 'nn' is
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the relative sequence number for killing or starting the job. When
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entering a state (init S,0,2,3,etc.) the rc[S0-6] script executes those
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scripts in /etc/rc[S0-6].d that are prefixed with 'K' followed by those
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scripts prefixed with 'S'. When executing each script in one of the
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/etc/rc[S0-6] directories, the /sbin/rc[S0-6] script passes a single
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argument. It passes the argument 'stop' for scripts prefixed with 'K'
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and the argument 'start' for scripts prefixed with 'S'. There is no harm
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in applying the same sequence number to multiple scripts. In this case
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the order of execution is deterministic but unspecified.
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Guidelines for selecting sequence numbers are provided in README files
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located in the directory associated with that target state (i.e.:
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/etc/rc[S0-6].d/README).
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EXAMPLE:
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When changing to init state 2 (multi-user mode, network resources
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not exported), /sbin/rc2 is initiated by the init process. The
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following steps are performed by /sbin/rc2.
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1. In the directory /etc/rc2.d are files used to stop processes
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that should not be running in state 2. The filenames are prefixed
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with 'K'. Each 'K' file in the directory is executed (by /sbin/rc2)
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in alpha-numeric order when the system enters init state 2. (see
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example under next item).
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2. Also in the rc2.d directory are files used to start processes
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that should be running in state 2. As in the step above, each 'S'
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file is executed.
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Example:
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Assume the file /etc/netdaemon is a script that will
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initiate networking daemons when given the argument
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'start', and will terminate the daemons if given the
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argument 'stop'. It is linked to /etc/rc2.d/S68netdaemon,
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and to /etc/rc0.d/K67netdaemon. The file is executed by
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'/etc/rc2.d/S68netdaemon start' when init state 2 is
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entered and by '/etc/rc0.d/S67netdaemon stop' when shutting
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the system down.
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NOTE:
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/sbin/rc2 has references to the obsolescent 'rc.d' directory. These
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references are for compatibility with old INSTALL scripts. New INSTALL
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scripts should use the init.d directory for related executables. The
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same is true for the shutdown.d directory.
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