std: begin moving platform support modules into `pal`

1 files changed, 0 insertions, 591 deletions

diff --git a/library/std/src/sys/unix/net.rs b/library/std/src/sys/unix/net.rs
deleted file mode 100644
index ec861f9cb86..00000000000
--- a/library/std/src/sys/unix/net.rs
+++ /dev/null
@@ -1,591 +0,0 @@
-use crate::cmp;
-use crate::ffi::CStr;
-use crate::io::{self, BorrowedBuf, BorrowedCursor, IoSlice, IoSliceMut};
-use crate::mem;
-use crate::net::{Shutdown, SocketAddr};
-use crate::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd};
-use crate::str;
-use crate::sys::fd::FileDesc;
-use crate::sys::unix::IsMinusOne;
-use crate::sys_common::net::{getsockopt, setsockopt, sockaddr_to_addr};
-use crate::sys_common::{AsInner, FromInner, IntoInner};
-use crate::time::{Duration, Instant};
-
-use libc::{c_int, c_void, size_t, sockaddr, socklen_t, MSG_PEEK};
-
-cfg_if::cfg_if! {
-    if #[cfg(target_vendor = "apple")] {
-        use libc::SO_LINGER_SEC as SO_LINGER;
-    } else {
-        use libc::SO_LINGER;
-    }
-}
-
-pub use crate::sys::{cvt, cvt_r};
-
-#[allow(unused_extern_crates)]
-pub extern crate libc as netc;
-
-pub type wrlen_t = size_t;
-
-pub struct Socket(FileDesc);
-
-pub fn init() {}
-
-pub fn cvt_gai(err: c_int) -> io::Result<()> {
-    if err == 0 {
-        return Ok(());
-    }
-
-    // We may need to trigger a glibc workaround. See on_resolver_failure() for details.
-    on_resolver_failure();
-
-    #[cfg(not(target_os = "espidf"))]
-    if err == libc::EAI_SYSTEM {
-        return Err(io::Error::last_os_error());
-    }
-
-    #[cfg(not(target_os = "espidf"))]
-    let detail = unsafe {
-        str::from_utf8(CStr::from_ptr(libc::gai_strerror(err)).to_bytes()).unwrap().to_owned()
-    };
-
-    #[cfg(target_os = "espidf")]
-    let detail = "";
-
-    Err(io::Error::new(
-        io::ErrorKind::Uncategorized,
-        &format!("failed to lookup address information: {detail}")[..],
-    ))
-}
-
-impl Socket {
-    pub fn new(addr: &SocketAddr, ty: c_int) -> io::Result<Socket> {
-        let fam = match *addr {
-            SocketAddr::V4(..) => libc::AF_INET,
-            SocketAddr::V6(..) => libc::AF_INET6,
-        };
-        Socket::new_raw(fam, ty)
-    }
-
-    pub fn new_raw(fam: c_int, ty: c_int) -> io::Result<Socket> {
-        unsafe {
-            cfg_if::cfg_if! {
-                if #[cfg(any(
-                    target_os = "android",
-                    target_os = "dragonfly",
-                    target_os = "freebsd",
-                    target_os = "illumos",
-                    target_os = "hurd",
-                    target_os = "linux",
-                    target_os = "netbsd",
-                    target_os = "openbsd",
-                    target_os = "nto",
-                ))] {
-                    // On platforms that support it we pass the SOCK_CLOEXEC
-                    // flag to atomically create the socket and set it as
-                    // CLOEXEC. On Linux this was added in 2.6.27.
-                    let fd = cvt(libc::socket(fam, ty | libc::SOCK_CLOEXEC, 0))?;
-                    Ok(Socket(FileDesc::from_raw_fd(fd)))
-                } else {
-                    let fd = cvt(libc::socket(fam, ty, 0))?;
-                    let fd = FileDesc::from_raw_fd(fd);
-                    fd.set_cloexec()?;
-                    let socket = Socket(fd);
-
-                    // macOS and iOS use `SO_NOSIGPIPE` as a `setsockopt`
-                    // flag to disable `SIGPIPE` emission on socket.
-                    #[cfg(target_vendor = "apple")]
-                    setsockopt(&socket, libc::SOL_SOCKET, libc::SO_NOSIGPIPE, 1)?;
-
-                    Ok(socket)
-                }
-            }
-        }
-    }
-
-    #[cfg(not(target_os = "vxworks"))]
-    pub fn new_pair(fam: c_int, ty: c_int) -> io::Result<(Socket, Socket)> {
-        unsafe {
-            let mut fds = [0, 0];
-
-            cfg_if::cfg_if! {
-                if #[cfg(any(
-                    target_os = "android",
-                    target_os = "dragonfly",
-                    target_os = "freebsd",
-                    target_os = "illumos",
-                    target_os = "linux",
-                    target_os = "hurd",
-                    target_os = "netbsd",
-                    target_os = "openbsd",
-                    target_os = "nto",
-                ))] {
-                    // Like above, set cloexec atomically
-                    cvt(libc::socketpair(fam, ty | libc::SOCK_CLOEXEC, 0, fds.as_mut_ptr()))?;
-                    Ok((Socket(FileDesc::from_raw_fd(fds[0])), Socket(FileDesc::from_raw_fd(fds[1]))))
-                } else {
-                    cvt(libc::socketpair(fam, ty, 0, fds.as_mut_ptr()))?;
-                    let a = FileDesc::from_raw_fd(fds[0]);
-                    let b = FileDesc::from_raw_fd(fds[1]);
-                    a.set_cloexec()?;
-                    b.set_cloexec()?;
-                    Ok((Socket(a), Socket(b)))
-                }
-            }
-        }
-    }
-
-    #[cfg(target_os = "vxworks")]
-    pub fn new_pair(_fam: c_int, _ty: c_int) -> io::Result<(Socket, Socket)> {
-        unimplemented!()
-    }
-
-    pub fn connect(&self, addr: &SocketAddr) -> io::Result<()> {
-        let (addr, len) = addr.into_inner();
-        loop {
-            let result = unsafe { libc::connect(self.as_raw_fd(), addr.as_ptr(), len) };
-            if result.is_minus_one() {
-                let err = crate::sys::os::errno();
-                match err {
-                    libc::EINTR => continue,
-                    libc::EISCONN => return Ok(()),
-                    _ => return Err(io::Error::from_raw_os_error(err)),
-                }
-            }
-            return Ok(());
-        }
-    }
-
-    pub fn connect_timeout(&self, addr: &SocketAddr, timeout: Duration) -> io::Result<()> {
-        self.set_nonblocking(true)?;
-        let r = unsafe {
-            let (addr, len) = addr.into_inner();
-            cvt(libc::connect(self.as_raw_fd(), addr.as_ptr(), len))
-        };
-        self.set_nonblocking(false)?;
-
-        match r {
-            Ok(_) => return Ok(()),
-            // there's no ErrorKind for EINPROGRESS :(
-            Err(ref e) if e.raw_os_error() == Some(libc::EINPROGRESS) => {}
-            Err(e) => return Err(e),
-        }
-
-        let mut pollfd = libc::pollfd { fd: self.as_raw_fd(), events: libc::POLLOUT, revents: 0 };
-
-        if timeout.as_secs() == 0 && timeout.subsec_nanos() == 0 {
-            return Err(io::const_io_error!(
-                io::ErrorKind::InvalidInput,
-                "cannot set a 0 duration timeout",
-            ));
-        }
-
-        let start = Instant::now();
-
-        loop {
-            let elapsed = start.elapsed();
-            if elapsed >= timeout {
-                return Err(io::const_io_error!(io::ErrorKind::TimedOut, "connection timed out"));
-            }
-
-            let timeout = timeout - elapsed;
-            let mut timeout = timeout
-                .as_secs()
-                .saturating_mul(1_000)
-                .saturating_add(timeout.subsec_nanos() as u64 / 1_000_000);
-            if timeout == 0 {
-                timeout = 1;
-            }
-
-            let timeout = cmp::min(timeout, c_int::MAX as u64) as c_int;
-
-            match unsafe { libc::poll(&mut pollfd, 1, timeout) } {
-                -1 => {
-                    let err = io::Error::last_os_error();
-                    if !err.is_interrupted() {
-                        return Err(err);
-                    }
-                }
-                0 => {}
-                _ => {
-                    // linux returns POLLOUT|POLLERR|POLLHUP for refused connections (!), so look
-                    // for POLLHUP rather than read readiness
-                    if pollfd.revents & libc::POLLHUP != 0 {
-                        let e = self.take_error()?.unwrap_or_else(|| {
-                            io::const_io_error!(
-                                io::ErrorKind::Uncategorized,
-                                "no error set after POLLHUP",
-                            )
-                        });
-                        return Err(e);
-                    }
-
-                    return Ok(());
-                }
-            }
-        }
-    }
-
-    pub fn accept(&self, storage: *mut sockaddr, len: *mut socklen_t) -> io::Result<Socket> {
-        // Unfortunately the only known way right now to accept a socket and
-        // atomically set the CLOEXEC flag is to use the `accept4` syscall on
-        // platforms that support it. On Linux, this was added in 2.6.28,
-        // glibc 2.10 and musl 0.9.5.
-        cfg_if::cfg_if! {
-            if #[cfg(any(
-                target_os = "android",
-                target_os = "dragonfly",
-                target_os = "freebsd",
-                target_os = "illumos",
-                target_os = "linux",
-                target_os = "hurd",
-                target_os = "netbsd",
-                target_os = "openbsd",
-            ))] {
-                unsafe {
-                    let fd = cvt_r(|| libc::accept4(self.as_raw_fd(), storage, len, libc::SOCK_CLOEXEC))?;
-                    Ok(Socket(FileDesc::from_raw_fd(fd)))
-                }
-            } else {
-                unsafe {
-                    let fd = cvt_r(|| libc::accept(self.as_raw_fd(), storage, len))?;
-                    let fd = FileDesc::from_raw_fd(fd);
-                    fd.set_cloexec()?;
-                    Ok(Socket(fd))
-                }
-            }
-        }
-    }
-
-    pub fn duplicate(&self) -> io::Result<Socket> {
-        self.0.duplicate().map(Socket)
-    }
-
-    fn recv_with_flags(&self, mut buf: BorrowedCursor<'_>, flags: c_int) -> io::Result<()> {
-        let ret = cvt(unsafe {
-            libc::recv(
-                self.as_raw_fd(),
-                buf.as_mut().as_mut_ptr() as *mut c_void,
-                buf.capacity(),
-                flags,
-            )
-        })?;
-        unsafe {
-            buf.advance(ret as usize);
-        }
-        Ok(())
-    }
-
-    pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
-        let mut buf = BorrowedBuf::from(buf);
-        self.recv_with_flags(buf.unfilled(), 0)?;
-        Ok(buf.len())
-    }
-
-    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
-        let mut buf = BorrowedBuf::from(buf);
-        self.recv_with_flags(buf.unfilled(), MSG_PEEK)?;
-        Ok(buf.len())
-    }
-
-    pub fn read_buf(&self, buf: BorrowedCursor<'_>) -> io::Result<()> {
-        self.recv_with_flags(buf, 0)
-    }
-
-    pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        self.0.read_vectored(bufs)
-    }
-
-    #[inline]
-    pub fn is_read_vectored(&self) -> bool {
-        self.0.is_read_vectored()
-    }
-
-    fn recv_from_with_flags(
-        &self,
-        buf: &mut [u8],
-        flags: c_int,
-    ) -> io::Result<(usize, SocketAddr)> {
-        let mut storage: libc::sockaddr_storage = unsafe { mem::zeroed() };
-        let mut addrlen = mem::size_of_val(&storage) as libc::socklen_t;
-
-        let n = cvt(unsafe {
-            libc::recvfrom(
-                self.as_raw_fd(),
-                buf.as_mut_ptr() as *mut c_void,
-                buf.len(),
-                flags,
-                &mut storage as *mut _ as *mut _,
-                &mut addrlen,
-            )
-        })?;
-        Ok((n as usize, sockaddr_to_addr(&storage, addrlen as usize)?))
-    }
-
-    pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        self.recv_from_with_flags(buf, 0)
-    }
-
-    #[cfg(any(target_os = "android", target_os = "linux"))]
-    pub fn recv_msg(&self, msg: &mut libc::msghdr) -> io::Result<usize> {
-        let n = cvt(unsafe { libc::recvmsg(self.as_raw_fd(), msg, libc::MSG_CMSG_CLOEXEC) })?;
-        Ok(n as usize)
-    }
-
-    pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
-        self.recv_from_with_flags(buf, MSG_PEEK)
-    }
-
-    pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
-        self.0.write(buf)
-    }
-
-    pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        self.0.write_vectored(bufs)
-    }
-
-    #[inline]
-    pub fn is_write_vectored(&self) -> bool {
-        self.0.is_write_vectored()
-    }
-
-    #[cfg(any(target_os = "android", target_os = "linux"))]
-    pub fn send_msg(&self, msg: &mut libc::msghdr) -> io::Result<usize> {
-        let n = cvt(unsafe { libc::sendmsg(self.as_raw_fd(), msg, 0) })?;
-        Ok(n as usize)
-    }
-
-    pub fn set_timeout(&self, dur: Option<Duration>, kind: libc::c_int) -> io::Result<()> {
-        let timeout = match dur {
-            Some(dur) => {
-                if dur.as_secs() == 0 && dur.subsec_nanos() == 0 {
-                    return Err(io::const_io_error!(
-                        io::ErrorKind::InvalidInput,
-                        "cannot set a 0 duration timeout",
-                    ));
-                }
-
-                let secs = if dur.as_secs() > libc::time_t::MAX as u64 {
-                    libc::time_t::MAX
-                } else {
-                    dur.as_secs() as libc::time_t
-                };
-                let mut timeout = libc::timeval {
-                    tv_sec: secs,
-                    tv_usec: dur.subsec_micros() as libc::suseconds_t,
-                };
-                if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
-                    timeout.tv_usec = 1;
-                }
-                timeout
-            }
-            None => libc::timeval { tv_sec: 0, tv_usec: 0 },
-        };
-        setsockopt(self, libc::SOL_SOCKET, kind, timeout)
-    }
-
-    pub fn timeout(&self, kind: libc::c_int) -> io::Result<Option<Duration>> {
-        let raw: libc::timeval = getsockopt(self, libc::SOL_SOCKET, kind)?;
-        if raw.tv_sec == 0 && raw.tv_usec == 0 {
-            Ok(None)
-        } else {
-            let sec = raw.tv_sec as u64;
-            let nsec = (raw.tv_usec as u32) * 1000;
-            Ok(Some(Duration::new(sec, nsec)))
-        }
-    }
-
-    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
-        let how = match how {
-            Shutdown::Write => libc::SHUT_WR,
-            Shutdown::Read => libc::SHUT_RD,
-            Shutdown::Both => libc::SHUT_RDWR,
-        };
-        cvt(unsafe { libc::shutdown(self.as_raw_fd(), how) })?;
-        Ok(())
-    }
-
-    pub fn set_linger(&self, linger: Option<Duration>) -> io::Result<()> {
-        let linger = libc::linger {
-            l_onoff: linger.is_some() as libc::c_int,
-            l_linger: linger.unwrap_or_default().as_secs() as libc::c_int,
-        };
-
-        setsockopt(self, libc::SOL_SOCKET, SO_LINGER, linger)
-    }
-
-    pub fn linger(&self) -> io::Result<Option<Duration>> {
-        let val: libc::linger = getsockopt(self, libc::SOL_SOCKET, SO_LINGER)?;
-
-        Ok((val.l_onoff != 0).then(|| Duration::from_secs(val.l_linger as u64)))
-    }
-
-    pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
-        setsockopt(self, libc::IPPROTO_TCP, libc::TCP_NODELAY, nodelay as c_int)
-    }
-
-    pub fn nodelay(&self) -> io::Result<bool> {
-        let raw: c_int = getsockopt(self, libc::IPPROTO_TCP, libc::TCP_NODELAY)?;
-        Ok(raw != 0)
-    }
-
-    #[cfg(any(target_os = "android", target_os = "linux",))]
-    pub fn set_quickack(&self, quickack: bool) -> io::Result<()> {
-        setsockopt(self, libc::IPPROTO_TCP, libc::TCP_QUICKACK, quickack as c_int)
-    }
-
-    #[cfg(any(target_os = "android", target_os = "linux",))]
-    pub fn quickack(&self) -> io::Result<bool> {
-        let raw: c_int = getsockopt(self, libc::IPPROTO_TCP, libc::TCP_QUICKACK)?;
-        Ok(raw != 0)
-    }
-
-    #[cfg(any(target_os = "android", target_os = "linux",))]
-    pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
-        setsockopt(self, libc::SOL_SOCKET, libc::SO_PASSCRED, passcred as libc::c_int)
-    }
-
-    #[cfg(any(target_os = "android", target_os = "linux",))]
-    pub fn passcred(&self) -> io::Result<bool> {
-        let passcred: libc::c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_PASSCRED)?;
-        Ok(passcred != 0)
-    }
-
-    #[cfg(target_os = "netbsd")]
-    pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
-        setsockopt(self, 0 as libc::c_int, libc::LOCAL_CREDS, passcred as libc::c_int)
-    }
-
-    #[cfg(target_os = "netbsd")]
-    pub fn passcred(&self) -> io::Result<bool> {
-        let passcred: libc::c_int = getsockopt(self, 0 as libc::c_int, libc::LOCAL_CREDS)?;
-        Ok(passcred != 0)
-    }
-
-    #[cfg(target_os = "freebsd")]
-    pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
-        setsockopt(self, libc::AF_LOCAL, libc::LOCAL_CREDS_PERSISTENT, passcred as libc::c_int)
-    }
-
-    #[cfg(target_os = "freebsd")]
-    pub fn passcred(&self) -> io::Result<bool> {
-        let passcred: libc::c_int = getsockopt(self, libc::AF_LOCAL, libc::LOCAL_CREDS_PERSISTENT)?;
-        Ok(passcred != 0)
-    }
-
-    #[cfg(not(any(target_os = "solaris", target_os = "illumos", target_os = "vita")))]
-    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
-        let mut nonblocking = nonblocking as libc::c_int;
-        cvt(unsafe { libc::ioctl(self.as_raw_fd(), libc::FIONBIO, &mut nonblocking) }).map(drop)
-    }
-
-    #[cfg(target_os = "vita")]
-    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
-        let option = nonblocking as libc::c_int;
-        setsockopt(self, libc::SOL_SOCKET, libc::SO_NONBLOCK, option)
-    }
-
-    #[cfg(any(target_os = "solaris", target_os = "illumos"))]
-    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
-        // FIONBIO is inadequate for sockets on illumos/Solaris, so use the
-        // fcntl(F_[GS]ETFL)-based method provided by FileDesc instead.
-        self.0.set_nonblocking(nonblocking)
-    }
-
-    #[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "openbsd"))]
-    pub fn set_mark(&self, mark: u32) -> io::Result<()> {
-        #[cfg(target_os = "linux")]
-        let option = libc::SO_MARK;
-        #[cfg(target_os = "freebsd")]
-        let option = libc::SO_USER_COOKIE;
-        #[cfg(target_os = "openbsd")]
-        let option = libc::SO_RTABLE;
-        setsockopt(self, libc::SOL_SOCKET, option, mark as libc::c_int)
-    }
-
-    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        let raw: c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_ERROR)?;
-        if raw == 0 { Ok(None) } else { Ok(Some(io::Error::from_raw_os_error(raw as i32))) }
-    }
-
-    // This is used by sys_common code to abstract over Windows and Unix.
-    pub fn as_raw(&self) -> RawFd {
-        self.as_raw_fd()
-    }
-}
-
-impl AsInner<FileDesc> for Socket {
-    #[inline]
-    fn as_inner(&self) -> &FileDesc {
-        &self.0
-    }
-}
-
-impl IntoInner<FileDesc> for Socket {
-    fn into_inner(self) -> FileDesc {
-        self.0
-    }
-}
-
-impl FromInner<FileDesc> for Socket {
-    fn from_inner(file_desc: FileDesc) -> Self {
-        Self(file_desc)
-    }
-}
-
-impl AsFd for Socket {
-    fn as_fd(&self) -> BorrowedFd<'_> {
-        self.0.as_fd()
-    }
-}
-
-impl AsRawFd for Socket {
-    #[inline]
-    fn as_raw_fd(&self) -> RawFd {
-        self.0.as_raw_fd()
-    }
-}
-
-impl IntoRawFd for Socket {
-    fn into_raw_fd(self) -> RawFd {
-        self.0.into_raw_fd()
-    }
-}
-
-impl FromRawFd for Socket {
-    unsafe fn from_raw_fd(raw_fd: RawFd) -> Self {
-        Self(FromRawFd::from_raw_fd(raw_fd))
-    }
-}
-
-// In versions of glibc prior to 2.26, there's a bug where the DNS resolver
-// will cache the contents of /etc/resolv.conf, so changes to that file on disk
-// can be ignored by a long-running program. That can break DNS lookups on e.g.
-// laptops where the network comes and goes. See
-// https://sourceware.org/bugzilla/show_bug.cgi?id=984. Note however that some
-// distros including Debian have patched glibc to fix this for a long time.
-//
-// A workaround for this bug is to call the res_init libc function, to clear
-// the cached configs. Unfortunately, while we believe glibc's implementation
-// of res_init is thread-safe, we know that other implementations are not
-// (https://github.com/rust-lang/rust/issues/43592). Code here in std could
-// try to synchronize its res_init calls with a Mutex, but that wouldn't
-// protect programs that call into libc in other ways. So instead of calling
-// res_init unconditionally, we call it only when we detect we're linking
-// against glibc version < 2.26. (That is, when we both know its needed and
-// believe it's thread-safe).
-#[cfg(all(target_os = "linux", target_env = "gnu"))]
-fn on_resolver_failure() {
-    use crate::sys;
-
-    // If the version fails to parse, we treat it the same as "not glibc".
-    if let Some(version) = sys::os::glibc_version() {
-        if version < (2, 26) {
-            unsafe { libc::res_init() };
-        }
-    }
-}
-
-#[cfg(not(all(target_os = "linux", target_env = "gnu")))]
-fn on_resolver_failure() {}