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.\"
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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\"
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.\" $FreeBSD$
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.\"
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2001-07-13 18:35:48 +00:00
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.Dd July 10, 2001
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.Dt UIDINFO 9
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.Os
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.Sh NAME
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.Nm uidinfo ,
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.Nm uihashinit ,
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.Nm uifind ,
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.Nm uihold ,
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.Nm uifree
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.Nd "functions for managing UID information"
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/proc.h
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.In sys/resourcevar.h
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.Ft void
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.Fn uihashinit void
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.Ft "struct uidinfo *"
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.Fn uifind "uid_t uid"
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.Ft void
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.Fn uihold "struct uidinfo *uip"
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.Ft void
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.Fn uifree "struct uidinfo *uip"
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.Sh DESCRIPTION
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The
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.Nm
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family of functions
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is used to manage
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.Vt uidinfo
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structures.
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Each
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.Vt uidinfo
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structure maintains per uid resource consumption counts, including the
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process count and socket buffer space usage.
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.Pp
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The
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.Fn uihashinit
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function initializes the
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.Vt uidinfo
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hash table and its mutex.
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This function should only be called during system initialization.
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.Pp
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The
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.Fn uifind
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function looks up and returns the
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.Vt uidinfo
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structure for
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.Fa uid .
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If no
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.Vt uidinfo
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structure exists for
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.Fa uid ,
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a new structure will be allocated and initialized.
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The
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.Nm
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hash mutex is acquired and released.
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.Pp
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The
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.Fn uihold
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function increases the reference count on
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.Fa uip .
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.Fa uip Ns 's
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lock is acquired and released.
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.Pp
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The
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.Fn uifree
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function decreases the reference count on
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.Fa uip ,
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and if the count reaches 0
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.Fa uip
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is freed.
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.Fa uip Ns 's
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lock is acquired and release and the uidinfo hash mutex may be
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acquired and released.
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.Sh RETURN VALUES
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.Fn uifind
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returns a pointer to an initialized
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.Vt uidinfo
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structure, and should not fail.
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.Sh AUTHORS
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2005-06-28 20:15:19 +00:00
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This manual page was written by
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2001-07-13 18:35:48 +00:00
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.An Chad David Aq davidc@acns.ab.ca .
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