1 | /* Copyright (C) 1991-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library 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 GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <stddef.h> |
20 | #include <termios.h> |
21 | #include <unistd.h> |
22 | #include "bsdtty.h" |
23 | #include <sys/file.h> |
24 | |
25 | /* Flush pending data on FD. */ |
26 | int |
27 | tcflush (int fd, int queue_selector) |
28 | { |
29 | int arg; |
30 | |
31 | switch (queue_selector) |
32 | { |
33 | case TCIFLUSH: |
34 | arg = FREAD; |
35 | break; |
36 | case TCOFLUSH: |
37 | arg = FWRITE; |
38 | break; |
39 | case TCIOFLUSH: |
40 | arg = FREAD | FWRITE; |
41 | break; |
42 | default: |
43 | __set_errno (EINVAL); |
44 | return -1; |
45 | } |
46 | |
47 | return __ioctl (fd, TIOCFLUSH, (void *) &arg); |
48 | } |
49 | |