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+     * our entries are not outdated.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;
+}