Fix some spacing nits, an Xref section, and a long line.
Bump date for previous.
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wiz
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@ -1,4 +1,4 @@
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.\" $NetBSD: intro.2,v 1.37 2004/01/07 16:26:23 christos Exp $
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.\" $NetBSD: intro.2,v 1.38 2004/01/08 09:12:57 wiz Exp $
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.\"
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.\" Copyright (c) 1980, 1983, 1986, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -29,7 +29,7 @@
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.\"
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.\" @(#)intro.2 8.5 (Berkeley) 2/27/95
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.\"
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.Dd November 25, 2003
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.Dd January 7, 2004
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.Dt INTRO 2
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.Os
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.Sh NAME
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@ -474,18 +474,18 @@ operation has expired.
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.El
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.Sh DEFINITIONS
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.Bl -tag -width Ds
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.It Process ID .
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.It Process ID .
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Each active process in the system is uniquely identified by a non-negative
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integer called a process ID.
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The range of this ID is from 0 to 30000.
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.It Parent process ID
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.It Parent process ID
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A new process is created by a currently active process; (see
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.Xr fork 2 ) .
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The parent process ID of a process is initially the process ID of its creator.
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If the creating process exits,
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the parent process ID of each child is set to the ID of a system process,
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.Xr init 8 .
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.It Process Group
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.It Process Group
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Each active process is a member of a process group that is identified by
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a non-negative integer called the process group ID.
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This is the process ID of the group leader.
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@ -510,7 +510,7 @@ A session leader with a controlling terminal is a controlling process.
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.It Controlling terminal
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A terminal that is associated with a session is known as the controlling
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terminal for that session and its members.
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.It "Terminal Process Group ID"
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.It "Terminal Process Group ID"
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A terminal may be acquired by a session leader as its controlling terminal.
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Once a terminal is associated with a session, any of the process groups
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within the session may be placed into the foreground by setting
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@ -522,7 +522,7 @@ to arbitrate between multiple jobs contending for the same terminal.
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and
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.Xr tty 4
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for more information on job control.)
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.It "Orphaned Process Group"
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.It "Orphaned Process Group"
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A process group is considered to be
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.Em orphaned
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if it is not under the control of a job control shell.
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@ -572,7 +572,7 @@ The group access list is a set of group IDs
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used only in determining resource accessibility.
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Access checks are performed as described below in
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.Qq File Access Permissions .
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.It "Saved Set User ID and Saved Set Group ID"
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.It "Saved Set User ID and Saved Set Group ID"
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When a process executes a new file, the effective user ID is set
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to the owner of the file if the file is set-user-ID, and the effective
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group ID (first element of the group access list) is set to the group
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@ -585,11 +585,11 @@ or group ID after reverting to the real ID (see
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(In POSIX.1, the saved set-user-ID and saved set-group-ID are optional,
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and are used in setuid and setgid, but this does not work as desired
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for the super-user.)
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.It Super-user
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.It Super-user
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A process is recognized as a
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.Em super-user
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process and is granted special privileges if its effective user ID is 0.
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.It Special Processes
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.It Special Processes
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The processes with process IDs of 0 and 1 are special.
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Process 0 is the scheduler.
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Process 1 is the initialization process
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@ -602,7 +602,7 @@ periodic tasks or device related tasks, such as:
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.It Sy acctwatch
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System accounting disk watcher, see
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.Xr acct 2 ,
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.Xr acct 4 .
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.Xr acct 5 .
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.It Sy aiodoned
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Asynchronous I/O done handler, see
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.Xr uvm 9 .
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@ -619,22 +619,22 @@ File system snapshot thread, see
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.Xr fss 4 .
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.It Sy ioflush
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The in-kernel periodic flush the buffer cache to disk task,
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which replaces the old
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which replaces the old
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.Sy update
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program.
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.It Sy nfsio, nfskqpoll
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.It Sy nfsio , nfskqpoll
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NFS handing daemons.
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.It Sy lfs_writer
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Log filesystem writer.
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.It Sy pagedaemon
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The page daemon.
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.It Sy raidX, raidioX, raid_parity, raid_recon, raid_reconip, raid_copyback
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.It Sy raidX , raidioX , raid_parity , raid_recon , raid_reconip , raid_copyback
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Raid framework related threads, see
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.Xr raid 4 .
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.It Sy scsibusX
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SCSI bus handler, see
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.Xr scsi 4 .
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.It Sy smbiodX, smbkq
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.It Sy smbiodX , smbkq
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SMBFS handling daemon, see
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.Xr netsmb 4 .
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.It Sy swdmover
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@ -642,14 +642,15 @@ The software data mover I/O thread, see
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.Xr dmoverio 4 .
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.It Sy sysmon
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The systems monitoring framework daemon.
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.It Sy usbX, usbtask
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.It Sy usbX , usbtask
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USB bus handler, see
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.Xr usb 4 .
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.El
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.Pp
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There are more machine-dependent kernel threads allocated by different drivers.
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There are more machine-dependent kernel threads allocated by
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different drivers.
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See the specific driver manual pages for more information.
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.It Descriptor
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.It Descriptor
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An integer assigned by the system when a file is referenced
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by
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.Xr open 2
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@ -662,7 +663,7 @@ or
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.Xr socketpair 2 ,
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which uniquely identifies an access path to that file or socket from
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a given process or any of its children.
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.It File Name
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.It File Name
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Names consisting of up to 255
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.Pq Dv MAXNAMELEN
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characters may be used to name
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@ -687,7 +688,7 @@ or
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as part of
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file names because of the special meaning attached to these characters
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by the shell.
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.It Pathname
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.It Pathname
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A path name is a
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.Tn NUL Ns -terminated
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character string starting with an
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@ -705,7 +706,7 @@ directory.
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Otherwise, the search begins from the current working directory.
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A slash by itself names the root directory.
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An empty string is not a valid pathname.
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.It Directory
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.It Directory
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A directory is a special type of file that contains entries
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that are references to other files.
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Directory entries are called links.
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@ -725,7 +726,7 @@ and a current working directory for the purpose of resolving path
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name searches.
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A process's root directory need not be the root
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directory of the root file system.
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.It File Access Permissions
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.It File Access Permissions
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Every file in the file system has a set of access permissions.
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These permissions are used in determining whether a process
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may perform a requested operation on the file (such as opening
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@ -770,7 +771,7 @@ match the corresponding user ID and group ID of the file,
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but the permissions for ``other users'' allow access.
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.Pp
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Otherwise, permission is denied.
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.It Sockets and Address Families
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.It Sockets and Address Families
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A socket is an endpoint for communication between processes.
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Each socket has queues for sending and receiving data.
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.Pp
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