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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commit4aed2c8219774f5d797760606b8489a92ddc5163 (patch)
tree3f8c130f7d269626bf6a9447407ef6c35954426a /ksysguard/ksysguardd/PWUIDCache.c
downloadtdebase-4aed2c8219774f5d797760606b8489a92ddc5163.tar.gz
tdebase-4aed2c8219774f5d797760606b8489a92ddc5163.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
Diffstat (limited to 'ksysguard/ksysguardd/PWUIDCache.c')
-rw-r--r--ksysguard/ksysguardd/PWUIDCache.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/ksysguard/ksysguardd/PWUIDCache.c b/ksysguard/ksysguardd/PWUIDCache.c
new file mode 100644
index 000000000..b0140e0a7
--- /dev/null
+++ b/ksysguard/ksysguardd/PWUIDCache.c
@@ -0,0 +1,114 @@
+/*
+ KSysGuard, the KDE System Guard
+
+ Copyright (c) 2000 Chris Schlaeger <cs@kde.org>
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of version 2 of the GNU General Public
+ License as published by the Free Software Foundation.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+*/
+
+#include <pwd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include "ccont.h"
+
+#include "PWUIDCache.h"
+
+/* Cached values become invalid after 5 minutes */
+#define TIMEOUT 300
+
+typedef struct {
+ uid_t uid;
+ char* uName;
+ time_t tStamp;
+} CachedPWUID;
+
+static CONTAINER UIDCache = 0;
+static time_t lastCleanup = 0;
+
+void PWUIDCache_cleanup( void* c );
+
+static int uidCmp( void* p1, void* p2 )
+{
+ return ( ((CachedPWUID*)p1)->uid - ((CachedPWUID*)p2)->uid );
+}
+
+void PWUIDCache_cleanup( void* c )
+{
+ if ( c ) {
+ if ( ((CachedPWUID*)c)->uName )
+ free ( ((CachedPWUID*)c)->uName );
+ free ( c );
+ }
+}
+
+void initPWUIDCache()
+{
+ UIDCache = new_ctnr();
+}
+
+void exitPWUIDCache()
+{
+ destr_ctnr( UIDCache, PWUIDCache_cleanup );
+}
+
+const char* getCachedPWUID( uid_t uid )
+{
+ CachedPWUID key;
+ CachedPWUID* entry = 0;
+ long idx;
+ time_t stamp;
+
+ stamp = time( 0 );
+ if ( stamp - lastCleanup > TIMEOUT ) {
+ /* Cleanup cache entries every TIMEOUT seconds so that we
+ * don't pile tons of unused entries, and to make sure that
+ * our entries are not outdated. */
+ for ( entry = first_ctnr( UIDCache ); entry; entry = next_ctnr( UIDCache ) ) {
+ /* If a cache entry has not been updated for TIMEOUT
+ * seconds the entry is removed. */
+ if ( stamp - entry->tStamp > TIMEOUT )
+ PWUIDCache_cleanup( remove_ctnr( UIDCache ) );
+ }
+
+ lastCleanup = stamp;
+ }
+
+ key.uid = uid;
+ if ( ( idx = search_ctnr( UIDCache, uidCmp, &key ) ) < 0 ) {
+ struct passwd* pwent;
+
+ /* User id is not yet known */
+ entry = (CachedPWUID*)malloc( sizeof( CachedPWUID ) );
+ entry->tStamp = stamp;
+ entry->uid = uid;
+
+ pwent = getpwuid( uid );
+ if ( pwent )
+ entry->uName = strdup( pwent->pw_name );
+ else
+ entry->uName = strdup( "?" );
+
+ push_ctnr( UIDCache, entry );
+ bsort_ctnr( UIDCache, uidCmp );
+ } else {
+ /* User is is already known */
+ entry = get_ctnr( UIDCache, idx );
+ }
+
+ return entry->uName;
+}