Implement error.h

[lttng-ust.git] / liblttng-ust / error.h

diff --git a/liblttng-ust/error.h b/liblttng-ust/error.h
new file mode 100644 (file)
index 0000000..b0afcdb
--- /dev/null
+++ b/liblttng-ust/error.h
@@ -0,0 +1,54 @@
+#ifndef _LTTNG_ERROR_H
+#define _LTTNG_ERROR_H
+
+/*
+ * Copyright (c) 2011 - Mathieu Desnoyers <mathieu.desnoyers@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
+ */
+
+#include <urcu/compiler.h>
+#include <unistd.h>
+
+#define MAX_ERRNO      4095
+
+static inline
+int IS_ERR_VALUE(long value)
+{
+       if (caa_unlikely((unsigned long) value >= (unsigned long) -MAX_ERRNO))
+               return 1;
+       else
+               return 0;
+}
+
+static inline
+void *ERR_PTR(long error)
+{
+       return (void *) error;
+}
+
+static inline
+long PTR_ERR(const void *ptr)
+{
+       return (long) ptr;
+}
+
+static inline
+int IS_ERR(const void *ptr)
+{
+       return IS_ERR_VALUE((long) ptr);
+}
+
+#endif /* _LTTNG_ERROR_H */