X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Fdynamic-array.h;h=be27cc4958d51a2f2b42320044e371a0e664b492;hb=a0377dfefe40662ba7d68617bce6ff467114136c;hp=208dd1956b41263df7f8336605f22e082bff21ac;hpb=ab5be9fa2eb5ba9600a82cd18fd3cfcbac69169a;p=lttng-tools.git

diff --git a/src/common/dynamic-array.h b/src/common/dynamic-array.h
index 208dd1956..be27cc495 100644
--- a/src/common/dynamic-array.h
+++ b/src/common/dynamic-array.h
@@ -9,7 +9,6 @@
 #define LTTNG_DYNAMIC_ARRAY_H
 
 #include <common/dynamic-buffer.h>
-#include <assert.h>
 
 typedef void (*lttng_dynamic_array_element_destructor)(void *element);
 typedef void (*lttng_dynamic_pointer_array_destructor)(void *ptr);
@@ -52,10 +51,29 @@ static inline
 void *lttng_dynamic_array_get_element(const struct lttng_dynamic_array *array,
 		size_t element_index)
 {
-	assert(element_index < array->size);
+	LTTNG_ASSERT(element_index < array->size);
 	return array->buffer.data + (element_index * array->element_size);
 }
 
+/*
+ * Set the array's element count to new_element_count. Any added element will
+ * be zeroed.
+ *
+ * Be careful to expand the array's element count _before_ calling out external
+ * APIs (e.g. read(3)) which may populate the buffer as setting the element
+ * count after will zero-out the result of the operation.
+ *
+ * Shrinking an array does not zero the old content. If the buffer may contain
+ * sensititve information, it must be cleared manually _before_ changing the
+ * size.
+ *
+ * NOTE: It is striclty _invalid_ to access memory after _size_, regardless
+ *       of prior calls to set_capacity().
+ */
+LTTNG_HIDDEN
+int lttng_dynamic_array_set_count(struct lttng_dynamic_array *array,
+		size_t new_element_count);
+
 /*
  * Add an element to the end of a dynamic array. The array's element count is
  * increased by one and its underlying capacity is adjusted automatically.
@@ -121,6 +139,23 @@ void *lttng_dynamic_pointer_array_get_pointer(
 	return *element;
 }
 
+/*
+ * Returns the pointer at index `index`, sets the array slot to NULL. Does not
+ * run the destructor.
+ */
+
+static inline
+void *lttng_dynamic_pointer_array_steal_pointer(
+		struct lttng_dynamic_pointer_array *array, size_t index)
+{
+	void **p_element = lttng_dynamic_array_get_element(&array->array, index);
+	void *element = *p_element;
+
+	*p_element = NULL;
+
+	return element;
+}
+
 /*
  * Add a pointer to the end of a dynamic pointer array. The array's element
  * count is increased by one and its underlying capacity is adjusted