Added a notice about a (not yet fixed) dcache bug.

[betaftpd] / dcache.c

diff --git a/dcache.c b/dcache.c
index ddf5cab37a30662e043695e2c15e35cf7fd6fa61..5827bc54e78f94fd1b1e384fec252ac2924fbfab 100644 (file)
--- a/dcache.c
+++ b/dcache.c
@@ -63,6 +63,25 @@ struct dcache *alloc_new_dcache()
        return d;
 }
 
+/*
+ * destroy_dcache():
+ *             Destroy a directory listing cache entry, remove it from the
+ *             linked list, and clean up after it.
+ *
+ *             If you free a cache entry that is in use (use_count > 0),
+ *             BetaFTPD will most likely crash (later). The thing you're supposed
+ *             to do when you're done with a dcache entry, is to decrement
+ *             its use_count, and let the timeout functions do the destroying
+ *             when it's time to do so.
+ */
+void destroy_dcache(struct dcache * const d)
+{
+       if (d == NULL) return;
+
+       if (d->dir_data != NULL) free(d->dir_data);
+       remove_from_linked_list((struct list_element *)d);
+}
+
 /*
  * time_out_dcache():
  *             Time out expired directory listing cache entries.
@@ -108,4 +127,32 @@ void populate_dcache(struct ftran * const f, const char * const cwd,
                d->lo = *lo;
        }
 }
+
+/*
+ * find_dcache():
+ *             Check if there is an existing dcache object matching our
+ *             criteria.
+ */
+struct dcache *find_dcache(const char * const cwd, const char * const pattern,
+                           const struct list_options * const lo)
+{
+       struct dcache *d = NULL, *next = first_dcache->next_dcache;
+       struct stat buf;
+
+       if (stat(cwd, &buf) > -1) {
+               /* run through the linked list */
+               while (next != NULL) {
+                       d = next;
+                       next = d->next_dcache;
+
+                       if (buf.st_mtime <= d->generated &&
+                           strcmp(d->dir_name, cwd) == 0 &&
+                           strcmp(d->pattern, pattern) == 0 &&
+                           memcmp(&(d->lo), lo, sizeof(struct list_options)) == 0) {
+                               return d;
+                       }
+               }
+       }
+       return NULL;
+}
 #endif /* WANT_DCACHE */