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@@ -109,6 +109,14 @@ extern int dmalloc_free(const char *file, const int line, void *pnt,
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void tor_log_mallinfo(int severity);
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+/* Helper macro: free a variable of type 'type' using type_free_, and
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+ * set the variable to NULL. */
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+#define FREE_AND_NULL(type, var) \
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+ do { \
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+ type ## _free_(var); \
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+ (var) = NULL; \
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+ } while (0)
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+
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/** Macro: yield a pointer to the field at position <b>off</b> within the
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* structure <b>st</b>. Example:
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* <pre>
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