1 files changed, 50 insertions, 0 deletions
diff --git a/gnulib-tests/test-fadvise.c b/gnulib-tests/test-fadvise.c
new file mode 100644
index 0000000..a18c928
--- /dev/null
+++ b/gnulib-tests/test-fadvise.c
@@ -0,0 +1,50 @@
+/* Test that fadvise works as advertised.
+   Copyright (C) 2010-2023 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Pádraig Brady.  */
+
+#include <config.h>
+#include <stdio.h>
+
+#include "fadvise.h"
+
+/* We ignore any errors as these hints are only advisory.
+ * There is the chance one can pass invalid ADVICE, which will
+ * not be indicated, but given the simplicity of the interface
+ * this is unlikely.  Also not returning errors allows the
+ * unconditional passing of descriptors to non standard files,
+ * which will just be ignored if unsupported.  */
+
+int
+main (void)
+{
+  /* Valid.  */
+  fadvise (stdin, FADVISE_SEQUENTIAL);
+  fdadvise (fileno (stdin), 0, 0, FADVISE_RANDOM);
+
+  /* Ignored.  */
+  fadvise (nullptr, FADVISE_RANDOM);
+
+  /* Invalid.  */
+  fdadvise (42, 0, 0, FADVISE_RANDOM);
+  /* Unfortunately C enums are not types.
+     One could hack type safety by wrapping in a struct,
+     but it's probably not worth the complexity in this case.  */
+  fadvise (stdin, FADVISE_SEQUENTIAL + FADVISE_RANDOM);
+  fadvise (stdin, 4242);
+
+  return 0;
+}