X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-filter-interpreter.c;h=4b75f0bcd01854b4de53e1877ce05603919d2aa4;hb=e33f3265dfdcf38d91b10083afb1ea44c8e58732;hp=e6e96dbff9a9bf53cdb346b68cd63a9b4728d457;hpb=9b33aac411033000adafce04f947c7aca892c342;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-filter-interpreter.c b/liblttng-ust/lttng-filter-interpreter.c
index e6e96dbf..4b75f0bc 100644
--- a/liblttng-ust/lttng-filter-interpreter.c
+++ b/liblttng-ust/lttng-filter-interpreter.c
@@ -105,7 +105,7 @@ int stack_strcmp(struct estack *stack, int top, const char *cmp_type)
 	return diff;
 }
 
-int lttng_filter_false(void *filter_data,
+uint64_t lttng_filter_false(void *filter_data,
 		const char *filter_stack_data)
 {
 	return 0;
@@ -157,13 +157,18 @@ LABEL_##name
 
 #endif
 
-int lttng_filter_interpret_bytecode(void *filter_data,
+/*
+ * Return 0 (discard), or raise the 0x1 flag (log event).
+ * Currently, other flags are kept for future extensions and have no
+ * effect.
+ */
+uint64_t lttng_filter_interpret_bytecode(void *filter_data,
 		const char *filter_stack_data)
 {
 	struct bytecode_runtime *bytecode = filter_data;
 	void *pc, *next_pc, *start_pc;
 	int ret = -EINVAL;
-	int retval = 0;
+	uint64_t retval = 0;
 	struct estack _stack;
 	struct estack *stack = &_stack;
 	register int64_t ax = 0, bx = 0;
@@ -279,6 +284,7 @@ int lttng_filter_interpret_bytecode(void *filter_data,
 			goto end;
 
 		OP(FILTER_OP_RETURN):
+			/* LTTNG_FILTER_DISCARD  or LTTNG_FILTER_RECORD_FLAG */
 			retval = !!estack_ax_v;
 			ret = 0;
 			goto end;