1 /* Binary mode I/O.
2 Copyright 2017-2023 Free Software Foundation, Inc.
3
4 This file is free software: you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
8
9 This file is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 #include <config.h>
18
19 #define BINARY_IO_INLINE _GL_EXTERN_INLINE
20 #include "binary-io.h"
21
22 #if defined __DJGPP__ || defined __EMX__
23 # include <unistd.h>
24
25 int
26 set_binary_mode (int fd, int mode)
27 {
28 if (isatty (fd))
29 /* If FD refers to a console (not a pipe, not a regular file),
30 O_TEXT is the only reasonable mode, both on input and on output.
31 Silently ignore the request. If we were to return -1 here,
32 all programs that use xset_binary_mode would fail when run
33 with console input or console output. */
34 return O_TEXT;
35 else
36 return __gl_setmode (fd, mode);
37 }
38
39 #endif