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-rw-r--r--lib/binary-io.c39
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diff --git a/lib/binary-io.c b/lib/binary-io.c
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+/* Binary mode I/O.
+ Copyright 2017-2022 Free Software Foundation, Inc.
+
+ This file 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; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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 program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#define BINARY_IO_INLINE _GL_EXTERN_INLINE
+#include "binary-io.h"
+
+#if defined __DJGPP__ || defined __EMX__
+# include <unistd.h>
+
+int
+set_binary_mode (int fd, int mode)
+{
+ if (isatty (fd))
+ /* If FD refers to a console (not a pipe, not a regular file),
+ O_TEXT is the only reasonable mode, both on input and on output.
+ Silently ignore the request. If we were to return -1 here,
+ all programs that use xset_binary_mode would fail when run
+ with console input or console output. */
+ return O_TEXT;
+ else
+ return __gl_setmode (fd, mode);
+}
+
+#endif