mio/sys/unix/
tcp.rs

1use std::convert::TryInto;
2use std::io;
3use std::mem::{size_of, MaybeUninit};
4use std::net::{self, SocketAddr};
5#[cfg(not(target_os = "hermit"))]
6use std::os::fd::{AsRawFd, FromRawFd};
7// TODO: once <https://github.com/rust-lang/rust/issues/126198> is fixed this
8// can use `std::os::fd` and be merged with the above.
9#[cfg(target_os = "hermit")]
10use std::os::hermit::io::{AsRawFd, FromRawFd};
11
12use crate::sys::unix::net::{new_socket, socket_addr, to_socket_addr};
13
14pub(crate) fn new_for_addr(address: SocketAddr) -> io::Result<libc::c_int> {
15    let domain = match address {
16        SocketAddr::V4(_) => libc::AF_INET,
17        SocketAddr::V6(_) => libc::AF_INET6,
18    };
19    new_socket(domain, libc::SOCK_STREAM)
20}
21
22pub(crate) fn bind(socket: &net::TcpListener, addr: SocketAddr) -> io::Result<()> {
23    let (raw_addr, raw_addr_length) = socket_addr(&addr);
24    syscall!(bind(socket.as_raw_fd(), raw_addr.as_ptr(), raw_addr_length))?;
25    Ok(())
26}
27
28pub(crate) fn connect(socket: &net::TcpStream, addr: SocketAddr) -> io::Result<()> {
29    let (raw_addr, raw_addr_length) = socket_addr(&addr);
30
31    match syscall!(connect(
32        socket.as_raw_fd(),
33        raw_addr.as_ptr(),
34        raw_addr_length
35    )) {
36        Err(err) if err.raw_os_error() != Some(libc::EINPROGRESS) => Err(err),
37        _ => Ok(()),
38    }
39}
40
41pub(crate) fn listen(socket: &net::TcpListener, backlog: u32) -> io::Result<()> {
42    let backlog = backlog.try_into().unwrap_or(i32::MAX);
43    syscall!(listen(socket.as_raw_fd(), backlog))?;
44    Ok(())
45}
46
47pub(crate) fn set_reuseaddr(socket: &net::TcpListener, reuseaddr: bool) -> io::Result<()> {
48    let val: libc::c_int = i32::from(reuseaddr);
49    syscall!(setsockopt(
50        socket.as_raw_fd(),
51        libc::SOL_SOCKET,
52        libc::SO_REUSEADDR,
53        &val as *const libc::c_int as *const libc::c_void,
54        size_of::<libc::c_int>() as libc::socklen_t,
55    ))?;
56    Ok(())
57}
58
59pub(crate) fn accept(listener: &net::TcpListener) -> io::Result<(net::TcpStream, SocketAddr)> {
60    let mut addr: MaybeUninit<libc::sockaddr_storage> = MaybeUninit::uninit();
61    let mut length = size_of::<libc::sockaddr_storage>() as libc::socklen_t;
62
63    // On platforms that support it we can use `accept4(2)` to set `NONBLOCK`
64    // and `CLOEXEC` in the call to accept the connection.
65    #[cfg(any(
66        // Android x86's seccomp profile forbids calls to `accept4(2)`
67        // See https://github.com/tokio-rs/mio/issues/1445 for details
68        all(not(target_arch="x86"), target_os = "android"),
69        target_os = "dragonfly",
70        target_os = "freebsd",
71        target_os = "fuchsia",
72        target_os = "hurd",
73        target_os = "illumos",
74        target_os = "linux",
75        target_os = "netbsd",
76        target_os = "openbsd",
77        target_os = "solaris",
78    ))]
79    let stream = {
80        syscall!(accept4(
81            listener.as_raw_fd(),
82            addr.as_mut_ptr() as *mut _,
83            &mut length,
84            libc::SOCK_CLOEXEC | libc::SOCK_NONBLOCK,
85        ))
86        .map(|socket| unsafe { net::TcpStream::from_raw_fd(socket) })
87    }?;
88
89    // But not all platforms have the `accept4(2)` call. Luckily BSD (derived)
90    // OSs inherit the non-blocking flag from the listener, so we just have to
91    // set `CLOEXEC`.
92    #[cfg(any(
93        target_os = "aix",
94        target_os = "haiku",
95        target_os = "ios",
96        target_os = "macos",
97        target_os = "redox",
98        target_os = "tvos",
99        target_os = "visionos",
100        target_os = "watchos",
101        target_os = "espidf",
102        target_os = "vita",
103        target_os = "hermit",
104        target_os = "nto",
105        all(target_arch = "x86", target_os = "android"),
106    ))]
107    let stream = {
108        syscall!(accept(
109            listener.as_raw_fd(),
110            addr.as_mut_ptr() as *mut _,
111            &mut length
112        ))
113        .map(|socket| unsafe { net::TcpStream::from_raw_fd(socket) })
114        .and_then(|s| {
115            #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
116            syscall!(fcntl(s.as_raw_fd(), libc::F_SETFD, libc::FD_CLOEXEC))?;
117
118            // See https://github.com/tokio-rs/mio/issues/1450
119            #[cfg(any(
120                all(target_arch = "x86", target_os = "android"),
121                target_os = "espidf",
122                target_os = "vita",
123                target_os = "hermit",
124                target_os = "nto",
125            ))]
126            syscall!(fcntl(s.as_raw_fd(), libc::F_SETFL, libc::O_NONBLOCK))?;
127
128            Ok(s)
129        })
130    }?;
131
132    // This is safe because `accept` calls above ensures the address
133    // initialised.
134    unsafe { to_socket_addr(addr.as_ptr()) }.map(|addr| (stream, addr))
135}
mio/sys/unix/tcp.rs

mio/sys/unix/
tcp.rs
