usr/src/cmd/hal/addons/network-devices/cache.c

   1 /*
   2  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  *
   5  * Licensed under the Academic Free License version 2.1
   6  */
   7
   8 #pragma ident   "%Z%%M% %I%     %E% SMI"
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <string.h>
  14
  15 #include <libhal.h>
  16 #include <logger.h>
  17
  18 #include <glib.h>
  19
  20 #include "network-discovery.h"
  21
  22 /*
  23  * The interfaces in this file comprise a means of keeping track of devices
  24  * that we have already seen and those that have gone missing.  This allows
  25  * us to quickly determine if we need to probe the device and quickly search
  26  * for devices that are no longer available.
  27  */
  28
  29 typedef struct {
  30         LibHalContext *ctx;
  31         time_t timestamp;
  32 } removal_args_t;
  33
  34 static GHashTable *seen = NULL;
  35
  36 static gboolean
  37 device_remove_if_stale(gpointer key, gpointer value, gpointer user_data)
  38 {
  39         gboolean result = FALSE;
  40         removal_args_t *args = user_data;
  41         char *name = key;
  42         time_t *val = value;
  43
  44         HAL_DEBUG(("test stale: %s (%d > %d)", name, args->timestamp, *val));
  45         if (args->timestamp > *val) {
  46                 DBusError error;
  47                 char **udi = NULL;
  48                 int num = 0;
  49
  50                 dbus_error_init(&error);
  51                 udi = libhal_manager_find_device_string_match(args->ctx,
  52                                         "network_device.address", name,
  53                                         &num, &error);
  54
  55                 if (udi != NULL) {
  56                         int i;
  57
  58                         for (i = 0; i < num; i++) {
  59                                 libhal_remove_device(args->ctx, udi[i], &error);
  60                                 HAL_DEBUG(("remove: %s (%s)", name, udi[i]));
  61                         }
  62                         libhal_free_string_array(udi);
  63                         result = TRUE;
  64                 }
  65                 if (dbus_error_is_set(&error))
  66                         dbus_error_free(&error);
  67         }
  68
  69         return (result);
  70 }
  71
  72 void
  73 scan_for_stale_devices(LibHalContext *ctx, time_t timestamp)
  74 {
  75         if (seen != NULL) {
  76                 removal_args_t args[1];
  77
  78                 args->ctx = ctx;
  79                 args->timestamp = timestamp;
  80
  81                 g_hash_table_foreach_remove(seen, device_remove_if_stale, args);
  82         }
  83 }
  84
  85 gboolean
  86 device_seen(char *name)
  87 {
  88         gboolean result;
  89         char *key;
  90         time_t *val;
  91
  92         if (seen == NULL)
  93                 seen = g_hash_table_new_full(g_str_hash, g_str_equal,
  94                                                 free, free);
  95
  96         result = g_hash_table_lookup_extended(seen, name,
  97                                 (gpointer)&key, (gpointer)&val);
  98
  99         if ((result == FALSE) && ((val = calloc(1, sizeof (*val))) != NULL)) {
 100                 g_hash_table_insert(seen, strdup(name), val);
 101         }
 102         (void) time(val);
 103         HAL_DEBUG(("seen: %s (%d)", name, *val));
 104
 105         return (result);
 106 }