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115 lines
2.7 KiB
115 lines
2.7 KiB
/*
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KSysGuard, the KDE System Guard
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Copyright (c) 2000 Chris Schlaeger <cs@kde.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of version 2 of the GNU General Public
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License as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <time.h>
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#include "ccont.h"
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#include "PWUIDCache.h"
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/* Cached values become invalid after 5 minutes */
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#define TIMEOUT 300
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typedef struct {
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uid_t uid;
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char* uName;
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time_t tStamp;
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} CachedPWUID;
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static CONTAINER UIDCache = 0;
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static time_t lastCleanup = 0;
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void PWUIDCache_cleanup( void* c );
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static int uidCmp( void* p1, void* p2 )
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{
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return ( ((CachedPWUID*)p1)->uid - ((CachedPWUID*)p2)->uid );
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}
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void PWUIDCache_cleanup( void* c )
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{
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if ( c ) {
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if ( ((CachedPWUID*)c)->uName )
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free ( ((CachedPWUID*)c)->uName );
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free ( c );
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}
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}
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void initPWUIDCache()
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{
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UIDCache = new_ctnr();
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}
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void exitPWUIDCache()
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{
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destr_ctnr( UIDCache, PWUIDCache_cleanup );
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}
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const char* getCachedPWUID( uid_t uid )
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{
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CachedPWUID key;
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CachedPWUID* entry = 0;
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long idx;
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time_t stamp;
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stamp = time( 0 );
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if ( stamp - lastCleanup > TIMEOUT ) {
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/* Cleanup cache entries every TIMEOUT seconds so that we
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* don't pile tons of unused entries, and to make sure that
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* our entries are not outdated. */
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for ( entry = first_ctnr( UIDCache ); entry; entry = next_ctnr( UIDCache ) ) {
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/* If a cache entry has not been updated for TIMEOUT
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* seconds the entry is removed. */
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if ( stamp - entry->tStamp > TIMEOUT )
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PWUIDCache_cleanup( remove_ctnr( UIDCache ) );
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}
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lastCleanup = stamp;
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}
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key.uid = uid;
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if ( ( idx = search_ctnr( UIDCache, uidCmp, &key ) ) < 0 ) {
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struct passwd* pwent;
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/* User id is not yet known */
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entry = (CachedPWUID*)malloc( sizeof( CachedPWUID ) );
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entry->tStamp = stamp;
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entry->uid = uid;
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pwent = getpwuid( uid );
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if ( pwent )
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entry->uName = strdup( pwent->pw_name );
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else
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entry->uName = strdup( "?" );
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push_ctnr( UIDCache, entry );
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bsort_ctnr( UIDCache, uidCmp );
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} else {
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/* User is is already known */
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entry = get_ctnr( UIDCache, idx );
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}
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return entry->uName;
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}
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