76 lines
3.3 KiB
C
76 lines
3.3 KiB
C
/*-
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* Copyright (c) 1992 Keith Muller.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego.
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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, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)cache.h 8.1 (Berkeley) 5/31/93
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* $FreeBSD$
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*/
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/*
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* Constants and data structures used to implement group and password file
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* caches. Traditional passwd/group cache routines perform quite poorly with
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* archives. The chances of hitting a valid lookup with an archive is quite a
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* bit worse than with files already resident on the filesystem. These misses
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* create a MAJOR performance cost. To address this problem, these routines
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* cache both hits and misses.
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*
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* NOTE: name lengths must be as large as those stored in ANY PROTOCOL and
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* as stored in the passwd and group files. CACHE SIZES MUST BE PRIME
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*/
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#define UNMLEN 32 /* >= user name found in any protocol */
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#define GNMLEN 32 /* >= group name found in any protocol */
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#define UID_SZ 317 /* size of user_name/uid cache */
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#define UNM_SZ 317 /* size of user_name/uid cache */
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#define GID_SZ 251 /* size of gid cache */
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#define GNM_SZ 317 /* size of group name cache */
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#define VALID 1 /* entry and name are valid */
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#define INVALID 2 /* entry valid, name NOT valid */
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/*
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* Node structures used in the user, group, uid, and gid caches.
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*/
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typedef struct uidc {
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int valid; /* is this a valid or a miss entry */
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char name[UNMLEN]; /* uid name */
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uid_t uid; /* cached uid */
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} UIDC;
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typedef struct gidc {
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int valid; /* is this a valid or a miss entry */
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char name[GNMLEN]; /* gid name */
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gid_t gid; /* cached gid */
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} GIDC;
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