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
|
use crate::conn::Connection;
use crate::conn::ConnectionExt;
use std::io;
use std::os::unix::net::UnixStream;
// TODO: Remove PeekExt once rust-lang/rust#73761 is stabilized
trait PeekExt {
fn peek(&self, buf: &mut [u8]) -> io::Result<usize>;
}
impl PeekExt for UnixStream {
#[cfg(feature = "paranoid_unsafe")]
#[allow(clippy::panic)]
fn peek(&self, _buf: &mut [u8]) -> io::Result<usize> {
panic!("cannot use `UnixStream::peek` with `paranoid_unsafe` until rust-lang/rust#73761 is stabilized");
}
#[cfg(not(feature = "paranoid_unsafe"))]
#[allow(non_camel_case_types)]
fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
use core::ffi::c_void;
use std::os::unix::io::AsRawFd;
// Define some libc types inline (to avoid bringing in entire libc dep)
// every platform supported by the libc crate uses c_int = i32
type c_int = i32;
type size_t = usize;
type ssize_t = isize;
const MSG_PEEK: c_int = 2;
extern "C" {
fn recv(socket: c_int, buf: *mut c_void, len: size_t, flags: c_int) -> ssize_t;
}
// from std/sys/unix/mod.rs
pub fn cvt(t: isize) -> io::Result<isize> {
if t == -1 {
Err(io::Error::last_os_error())
} else {
Ok(t)
}
}
// from std/sys/unix/net.rs
let ret = cvt(unsafe {
recv(
self.as_raw_fd(),
buf.as_mut_ptr() as *mut c_void,
buf.len(),
MSG_PEEK,
)
})?;
Ok(ret as usize)
}
}
impl Connection for UnixStream {
type Error = std::io::Error;
fn write(&mut self, byte: u8) -> Result<(), Self::Error> {
use std::io::Write;
Write::write_all(self, &[byte])
}
fn write_all(&mut self, buf: &[u8]) -> Result<(), Self::Error> {
use std::io::Write;
Write::write_all(self, buf)
}
fn flush(&mut self) -> Result<(), Self::Error> {
use std::io::Write;
Write::flush(self)
}
}
impl ConnectionExt for UnixStream {
fn read(&mut self) -> Result<u8, Self::Error> {
use std::io::Read;
self.set_nonblocking(false)?;
let mut buf = [0u8];
match Read::read_exact(self, &mut buf) {
Ok(_) => Ok(buf[0]),
Err(e) => Err(e),
}
}
fn peek(&mut self) -> Result<Option<u8>, Self::Error> {
self.set_nonblocking(true)?;
let mut buf = [0u8];
match PeekExt::peek(self, &mut buf) {
Ok(_) => Ok(Some(buf[0])),
Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => Ok(None),
Err(e) => Err(e),
}
}
}
|
