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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use prelude::v1::*;
use ffi::CStr;
use io;
use libc::{self, c_int, size_t};
use net::SocketAddr;
use str;
use sync::atomic::{self, AtomicBool};
use sys::c;
use sys::fd::FileDesc;
use sys_common::{AsInner, FromInner, IntoInner};
use sys_common::net::{getsockopt, setsockopt};
use time::Duration;
pub use sys::{cvt, cvt_r};
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(()) }
let detail = unsafe {
str::from_utf8(CStr::from_ptr(c::gai_strerror(err)).to_bytes()).unwrap()
.to_owned()
};
Err(io::Error::new(io::ErrorKind::Other,
&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,
};
unsafe {
let fd = try!(cvt(libc::socket(fam, ty, 0)));
let fd = FileDesc::new(fd);
fd.set_cloexec();
Ok(Socket(fd))
}
}
pub fn accept(&self, storage: *mut libc::sockaddr,
len: *mut libc::socklen_t) -> io::Result<Socket> {
let fd = try!(cvt_r(|| unsafe {
libc::accept(self.0.raw(), storage, len)
}));
let fd = FileDesc::new(fd);
fd.set_cloexec();
Ok(Socket(fd))
}
pub fn duplicate(&self) -> io::Result<Socket> {
use libc::funcs::posix88::fcntl::fcntl;
let make_socket = |fd| {
let fd = FileDesc::new(fd);
fd.set_cloexec();
Socket(fd)
};
static EMULATE_F_DUPFD_CLOEXEC: AtomicBool = AtomicBool::new(false);
if !EMULATE_F_DUPFD_CLOEXEC.load(atomic::Ordering::Relaxed) {
match cvt(unsafe { fcntl(self.0.raw(), libc::F_DUPFD_CLOEXEC, 0) }) {
// `EINVAL` can only be returned on two occasions: Invalid
// command (second parameter) or invalid third parameter. 0 is
// always a valid third parameter, so it must be the second
// parameter.
//
// Store the result in a global variable so we don't try each
// syscall twice.
Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {
EMULATE_F_DUPFD_CLOEXEC.store(true, atomic::Ordering::Relaxed);
}
res => return res.map(make_socket),
}
}
cvt(unsafe { fcntl(self.0.raw(), libc::F_DUPFD, 0) }).map(make_socket)
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
self.0.read(buf)
}
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::Error::new(io::ErrorKind::InvalidInput,
"cannot set a 0 duration timeout"));
}
let secs = if dur.as_secs() > libc::time_t::max_value() as u64 {
libc::time_t::max_value()
} else {
dur.as_secs() as libc::time_t
};
let mut timeout = libc::timeval {
tv_sec: secs,
tv_usec: (dur.subsec_nanos() / 1000) 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 = try!(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)))
}
}
}
impl AsInner<c_int> for Socket {
fn as_inner(&self) -> &c_int { self.0.as_inner() }
}
impl FromInner<c_int> for Socket {
fn from_inner(fd: c_int) -> Socket { Socket(FileDesc::new(fd)) }
}
impl IntoInner<c_int> for Socket {
fn into_inner(self) -> c_int { self.0.into_raw() }
}
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