Add userspace namespace contexts

[deliverable/lttng-ust.git] / liblttng-ust / ns.h

diff --git a/liblttng-ust/ns.h b/liblttng-ust/ns.h
new file mode 100644 (file)
index 0000000..4793f3e
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+++ b/liblttng-ust/ns.h
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+#ifndef _LTTNG_NS_H
+#define _LTTNG_NS_H
+
+/*
+ * Copyright (c) 2019 - Michael Jeanson <mjeanson@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+/*
+ * The lowest valid inode number that can be allocated in the proc filesystem
+ * is 0xF0000000. Any number below can be used internally as an error code.
+ *
+ * Zero is used in the kernel as an error code, it's the value we will return
+ * when we fail to read the proper inode number.
+ *
+ * One is used internally to identify an uninitialized cache entry, it should
+ * never be returned.
+ */
+
+enum ns_ino_state {
+       NS_INO_UNAVAILABLE      = 0x0,
+       NS_INO_UNINITIALIZED    = 0x1,
+       NS_INO_MIN              = 0xF0000000,
+};
+
+#endif /* _LTTNG_NS_H */