1 files changed, 28 insertions, 0 deletions
diff --git a/gl/lib/xstdopen.h b/gl/lib/xstdopen.h
new file mode 100644
index 0000000..0c18209
--- /dev/null
+++ b/gl/lib/xstdopen.h
@@ -0,0 +1,28 @@
+/* Ensure that stdin, stdout, stderr are open.
+   Copyright (C) 2019-2022 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/>.  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Ensures that the file descriptors of stdin, stdout, stderr (0, 1, 2) are
+   open.  Exits the program with an error message upon failure; the error
+   message may not appear if stderr is closed.  */
+extern void xstdopen (void);
+
+#ifdef __cplusplus
+}
+#endif