1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <errno.h>
#include <stddef.h>
#include <termios.h>
#include <unistd.h>
#include "bsdtty.h"
/* Suspend or restart transmission on FD. */
int
DEFUN(tcflow, (fd, action), int fd AND int action)
{
switch (action)
{
case TCOOFF:
return __ioctl(fd, TIOCSTOP, (PTR) NULL);
case TCOON:
return __ioctl(fd, TIOCSTART, (PTR) NULL);
case TCIOFF:
case TCION:
{
/* This just writes the START or STOP character with
`write'. Is there another way to do this? */
struct termios attr;
unsigned char c;
if (tcgetattr(fd, &attr) < 0)
return -1;
c = attr.c_cc[action == TCIOFF ? VSTOP : VSTART];
if (c != _POSIX_VDISABLE && write (fd, &c, 1) < 1)
return -1;
return 0;
}
default:
errno = EINVAL;
return -1;
}
}
|
