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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/* SPDX-License-Identifier: GPL-2.0+ OR BSD-4-Clause OR BSD-3-Clause OR BSD-2-Clause */
/*
* termios fuctions to support arbitrary baudrates (on Linux)
*
* Copyright (c) 2021 Pali Rohár <pali@kernel.org>
* Copyright (c) 2021 Marek Behún <kabel@kernel.org>
*/
#ifndef PPP_TERMIOS_LINUX_H
#define PPP_TERMIOS_LINUX_H
#include "pppdconf.h"
/*
* We need to use raw TCGETS2/TCSETS2 or TCGETS/TCSETS ioctls with the BOTHER
* flag in struct termios2/termios, defined in Linux headers <asm/ioctls.h>
* and <asm/termbits.h>. Since these headers conflict with glibc's header file
* <termios.h>, it is not possible to use libc's termios functions and we need
* to reimplement them via ioctl() calls.
*
* An arbitrary baudrate is supported when the macro BOTHER is defined. The
* baudrate value itself is then stored into the c_ospeed and c_ispeed members.
* If ioctls TCGETS2/TCSETS2 are defined and supported then these fields are
* present in struct termios2, otherwise these fields are present in struct
* termios.
*
* Note that the Bnnn constants from <termios.h> need not be compatible with
* Bnnn constants from <asm/termbits.h>.
*/
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <asm/ioctls.h>
#include <asm/termbits.h>
#if defined(BOTHER) && defined(TCGETS2)
#define termios termios2
#endif
static inline int tcgetattr(int fd, struct termios *t)
{
#if defined(BOTHER) && defined(TCGETS2)
return ioctl(fd, TCGETS2, t);
#else
return ioctl(fd, TCGETS, t);
#endif
}
static inline int tcsetattr(int fd, int a, const struct termios *t)
{
int cmd;
switch (a) {
#if defined(BOTHER) && defined(TCGETS2)
case TCSANOW:
cmd = TCSETS2;
break;
case TCSADRAIN:
cmd = TCSETSW2;
break;
case TCSAFLUSH:
cmd = TCSETSF2;
break;
#else
case TCSANOW:
cmd = TCSETS;
break;
case TCSADRAIN:
cmd = TCSETSW;
break;
case TCSAFLUSH:
cmd = TCSETSF;
break;
#endif
default:
errno = EINVAL;
return -1;
}
return ioctl(fd, cmd, t);
}
static inline int tcdrain(int fd)
{
return ioctl(fd, TCSBRK, 1);
}
static inline int tcflush(int fd, int q)
{
return ioctl(fd, TCFLSH, q);
}
static inline int tcsendbreak(int fd, int d)
{
#ifdef TCSBRKP
return ioctl(fd, TCSBRKP, d);
#else
return ioctl(fd, TCSBRK, 0);
#endif
}
static inline int tcflow(int fd, int a)
{
return ioctl(fd, TCXONC, a);
}
static inline pid_t tcgetsid(int fd)
{
pid_t sid;
if (ioctl(fd, TIOCGSID, &sid) < 0)
return (pid_t)-1;
return sid;
}
static inline speed_t cfgetospeed(const struct termios *t)
{
return t->c_cflag & CBAUD;
}
static inline int cfsetospeed(struct termios *t, speed_t s)
{
if (s & ~CBAUD) {
errno = EINVAL;
return -1;
}
t->c_cflag &= ~CBAUD;
t->c_cflag |= s;
return 0;
}
#ifdef IBSHIFT
static inline speed_t cfgetispeed(const struct termios *t)
{
speed_t s = (t->c_cflag >> IBSHIFT) & CBAUD;
if (s == B0)
return cfgetospeed(t);
else
return s;
}
static inline int cfsetispeed(struct termios *t, speed_t s)
{
if (s == 0)
s = B0;
if (s & ~CBAUD) {
errno = EINVAL;
return -1;
}
t->c_cflag &= ~(CBAUD << IBSHIFT);
t->c_cflag |= s << IBSHIFT;
return 0;
}
#else /* !IBSHIFT */
static inline speed_t cfgetispeed(const struct termios *t)
{
return cfgetospeed(t);
}
static inline int cfsetispeed(struct termios *t, speed_t s)
{
return cfsetospeed(t, s);
}
#endif /* !IBSHIFT */
static inline int cfsetspeed(struct termios *t, speed_t s)
{
if (cfsetospeed(t, s))
return -1;
#ifdef IBSHIFT
if (cfsetispeed(t, s))
return -1;
#endif
return 0;
}
static void cfmakeraw(struct termios *t)
{
t->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR |
ICRNL | IXON);
t->c_oflag &= ~OPOST;
t->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
t->c_cflag &= ~(CSIZE | PARENB);
t->c_cflag |= CS8;
}
#endif /* PPP_TERMIOS_LINUX_H */
|
