1.\" 2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as 9.\" the first lines of this file unmodified other than the possible 10.\" addition of one or more copyright notices. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice(s), this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 16.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY 19.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 25.\" DAMAGE. 26.\" 27.\" $FreeBSD$ 28.\" 29.Dd July 10, 2001 30.Dt UIDINFO 9 31.Os 32.Sh NAME 33.Nm uidinfo , 34.Nm uihashinit , 35.Nm uifind , 36.Nm uihold , 37.Nm uifree 38.Nd "functions for managing UID information" 39.Sh SYNOPSIS 40.In sys/param.h 41.In sys/proc.h 42.In sys/resourcevar.h 43.Ft void 44.Fn uihashinit void 45.Ft "struct uidinfo *" 46.Fn uifind "uid_t uid" 47.Ft void 48.Fn uihold "struct uidinfo *uip" 49.Ft void 50.Fn uifree "struct uidinfo *uip" 51.Sh DESCRIPTION 52The 53.Nm 54family of functions 55is used to manage 56.Vt uidinfo 57structures. 58Each 59.Vt uidinfo 60structure maintains per uid resource consumption counts, including the 61process count and socket buffer space usage. 62.Pp 63The 64.Fn uihashinit 65function initializes the 66.Vt uidinfo 67hash table and its mutex. 68This function should only be called during system initialization. 69.Pp 70The 71.Fn uifind 72function looks up and returns the 73.Vt uidinfo 74structure for 75.Fa uid . 76If no 77.Vt uidinfo 78structure exists for 79.Fa uid , 80a new structure will be allocated and initialized. 81The 82.Nm 83hash mutex is acquired and released. 84.Pp 85The 86.Fn uihold 87function increases the reference count on 88.Fa uip . 89.Fa uip Ns 's 90lock is acquired and released. 91.Pp 92The 93.Fn uifree 94function decreases the reference count on 95.Fa uip , 96and if the count reaches 0 97.Fa uip 98is freed. 99.Fa uip Ns 's 100lock is acquired and release and the uidinfo hash mutex may be 101acquired and released. 102.Sh RETURN VALUES 103.Fn uifind 104returns a pointer to an initialized 105.Vt uidinfo 106structure, and should not fail. 107.Sh AUTHORS 108This manual page was written by 109.An Chad David Aq Mt davidc@acns.ab.ca . 110