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b168057a | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
df4ef2ab UD |
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 | |
41bdb6e2 AJ |
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. | |
df4ef2ab UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
df4ef2ab | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <stddef.h> | |
20 | #include <termios.h> | |
21 | #include <unistd.h> | |
22 | ||
23 | #include "bsdtty.h" | |
24 | ||
25 | /* Suspend or restart transmission on FD. */ | |
26 | int | |
bd2260a2 | 27 | tcflow (int fd, int action) |
28f540f4 RM |
28 | { |
29 | switch (action) | |
30 | { | |
31 | case TCOOFF: | |
ce7f605b | 32 | return __ioctl (fd, TIOCSTOP, (void *) NULL); |
28f540f4 | 33 | case TCOON: |
ce7f605b | 34 | return __ioctl (fd, TIOCSTART, (void *) NULL); |
28f540f4 RM |
35 | |
36 | case TCIOFF: | |
37 | case TCION: | |
38 | { | |
39 | /* This just writes the START or STOP character with | |
40 | `write'. Is there another way to do this? */ | |
41 | struct termios attr; | |
42 | unsigned char c; | |
c4029823 | 43 | if (tcgetattr (fd, &attr) < 0) |
28f540f4 RM |
44 | return -1; |
45 | c = attr.c_cc[action == TCIOFF ? VSTOP : VSTART]; | |
46 | if (c != _POSIX_VDISABLE && write (fd, &c, 1) < 1) | |
47 | return -1; | |
48 | return 0; | |
49 | } | |
50 | ||
51 | default: | |
c4029823 | 52 | __set_errno (EINVAL); |
28f540f4 RM |
53 | return -1; |
54 | } | |
55 | } |