X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fust-app.cpp;fp=src%2Fbin%2Flttng-sessiond%2Fust-app.cpp;h=11d604ea9a463e7c32126b5189e46707e74f7ce1;hp=8addb5edacabb5bd9ed2397ab81f276cf5b078fb;hb=b6bbb1d666531bf061f29884da1b0d7c10f59aa0;hpb=88277a52069ed0135254ce29da617ebb6ecddbb8

diff --git a/src/bin/lttng-sessiond/ust-app.cpp b/src/bin/lttng-sessiond/ust-app.cpp
index 8addb5eda..11d604ea9 100644
--- a/src/bin/lttng-sessiond/ust-app.cpp
+++ b/src/bin/lttng-sessiond/ust-app.cpp
@@ -7895,3 +7895,30 @@ error:
 	rcu_read_unlock();
 	return ret;
 }
+
+lsu::ctl_field_quirks ust_app::ctl_field_quirks() const
+{
+	/*
+	 * Application contexts are expressed as variants. LTTng-UST announces
+	 * those by registering an enumeration named `..._tag`. It then registers a
+	 * variant as part of the event context that contains the various possible
+	 * types.
+	 *
+	 * Unfortunately, the names used in the enumeration and variant don't
+	 * match: the enumeration names are all prefixed with an underscore while
+	 * the variant type tag fields aren't.
+	 *
+	 * While the CTF 1.8.3 specification mentions that
+	 * underscores *should* (not *must*) be removed by CTF readers. Babeltrace
+	 * 1.x (and possibly others) expect a perfect match between the names used
+	 * by tags and variants.
+	 *
+	 * When the UNDERSCORE_PREFIXED_VARIANT_TAG_MAPPINGS quirk is enabled,
+	 * the variant's fields are modified to match the mappings of its tag.
+	 *
+	 * From ABI version >= 10.x, the variant fields and tag mapping names
+	 * correctly match, making this quirk unnecessary.
+	 */
+	return v_major <= 9 ? lsu::ctl_field_quirks::UNDERSCORE_PREFIXED_VARIANT_TAG_MAPPINGS :
+		lsu::ctl_field_quirks::NONE;
+}
\ No newline at end of file