1 files changed, 49 insertions, 0 deletions
diff --git a/src/gl/tests/test-fdopen.c b/src/gl/tests/test-fdopen.c
new file mode 100644
index 0000000..86793bc
--- /dev/null
+++ b/src/gl/tests/test-fdopen.c
@@ -0,0 +1,49 @@
+/* Test opening a stream with a file descriptor.
+   Copyright (C) 2011-2021 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/>.  */
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (fdopen, FILE *, (int, const char *));
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+  /* Test behavior on failure.  POSIX makes it hard to check for
+     failure, since the behavior is not well-defined on invalid file
+     descriptors, so try fdopen 1000 times and if that's not enough to
+     fail due to EMFILE, so be it.  */
+
+  int i;
+  for (i = 0; i < 1000; i++)
+    {
+      errno = 0;
+      if (! fdopen (STDOUT_FILENO, "w"))
+        {
+          ASSERT (errno != 0);
+          break;
+        }
+    }
+
+  return 0;
+}