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
use std::os::unix::prelude::{AsRawFd, RawFd};
use crate::{
generated::{bpf_attach_type::BPF_LIRC_MODE2, bpf_prog_type::BPF_PROG_TYPE_LIRC_MODE2},
programs::{load_program, query, Link, LinkRef, ProgramData, ProgramError, ProgramInfo},
sys::{bpf_obj_get_info_by_fd, bpf_prog_attach, bpf_prog_detach, bpf_prog_get_fd_by_id},
};
use libc::{close, dup};
#[derive(Debug)]
#[doc(alias = "BPF_PROG_TYPE_LIRC_MODE2")]
pub struct LircMode2 {
pub(crate) data: ProgramData,
}
impl LircMode2 {
pub fn load(&mut self) -> Result<(), ProgramError> {
load_program(BPF_PROG_TYPE_LIRC_MODE2, &mut self.data)
}
pub fn attach<T: AsRawFd>(&mut self, lircdev: T) -> Result<LinkRef, ProgramError> {
let prog_fd = self.data.fd_or_err()?;
let lircdev_fd = lircdev.as_raw_fd();
bpf_prog_attach(prog_fd, lircdev_fd, BPF_LIRC_MODE2).map_err(|(_, io_error)| {
ProgramError::SyscallError {
call: "bpf_prog_attach".to_owned(),
io_error,
}
})?;
Ok(self.data.link(LircLink::new(prog_fd, lircdev_fd)))
}
pub fn query<T: AsRawFd>(target_fd: T) -> Result<Vec<LircLink>, ProgramError> {
let prog_ids = query(target_fd.as_raw_fd(), BPF_LIRC_MODE2, 0, &mut None)?;
let mut prog_fds = Vec::with_capacity(prog_ids.len());
for id in prog_ids {
let fd = bpf_prog_get_fd_by_id(id).map_err(|io_error| ProgramError::SyscallError {
call: "bpf_prog_get_fd_by_id".to_owned(),
io_error,
})?;
prog_fds.push(fd as RawFd);
}
Ok(prog_fds
.into_iter()
.map(|prog_fd| LircLink {
prog_fd: Some(prog_fd),
target_fd: Some(unsafe { dup(target_fd.as_raw_fd()) }),
})
.collect())
}
}
#[derive(Debug)]
pub struct LircLink {
prog_fd: Option<RawFd>,
target_fd: Option<RawFd>,
}
impl LircLink {
pub(crate) fn new(prog_fd: RawFd, target_fd: RawFd) -> LircLink {
LircLink {
prog_fd: Some(prog_fd),
target_fd: Some(unsafe { dup(target_fd) }),
}
}
pub fn info(&self) -> Result<ProgramInfo, ProgramError> {
if let Some(fd) = self.prog_fd {
match bpf_obj_get_info_by_fd(fd) {
Ok(info) => Ok(ProgramInfo(info)),
Err(io_error) => Err(ProgramError::SyscallError {
call: "bpf_obj_get_info_by_fd".to_owned(),
io_error,
}),
}
} else {
Err(ProgramError::AlreadyDetached)
}
}
}
impl Link for LircLink {
fn detach(&mut self) -> Result<(), ProgramError> {
if let Some(prog_fd) = self.prog_fd.take() {
let target_fd = self.target_fd.take().unwrap();
let _ = bpf_prog_detach(prog_fd, target_fd, BPF_LIRC_MODE2);
unsafe { close(target_fd) };
Ok(())
} else {
Err(ProgramError::AlreadyDetached)
}
}
}
impl Drop for LircLink {
fn drop(&mut self) {
if let Some(target_fd) = self.target_fd.take() {
unsafe { close(target_fd) };
}
}
}