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// Copyright 2014 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 libc;
use std::io::IoResult;
use std::io;
use std::mem;
use std::ptr;
use super::c;
use super::net;
use super::{retry, last_error};
pub fn timeout(desc: &'static str) -> io::IoError {
io::IoError {
kind: io::TimedOut,
desc: desc,
detail: None,
}
}
pub fn ms_to_timeval(ms: u64) -> libc::timeval {
libc::timeval {
tv_sec: (ms / 1000) as libc::time_t,
tv_usec: ((ms % 1000) * 1000) as libc::suseconds_t,
}
}
// See http://developerweb.net/viewtopic.php?id=3196 for where this is
// derived from.
pub fn connect_timeout(fd: net::sock_t,
addrp: *libc::sockaddr,
len: libc::socklen_t,
timeout_ms: u64) -> IoResult<()> {
use std::os;
#[cfg(unix)] use INPROGRESS = libc::EINPROGRESS;
#[cfg(windows)] use INPROGRESS = libc::WSAEINPROGRESS;
#[cfg(unix)] use WOULDBLOCK = libc::EWOULDBLOCK;
#[cfg(windows)] use WOULDBLOCK = libc::WSAEWOULDBLOCK;
// Make sure the call to connect() doesn't block
try!(set_nonblocking(fd, true));
let ret = match unsafe { libc::connect(fd, addrp, len) } {
// If the connection is in progress, then we need to wait for it to
// finish (with a timeout). The current strategy for doing this is
// to use select() with a timeout.
-1 if os::errno() as int == INPROGRESS as int ||
os::errno() as int == WOULDBLOCK as int => {
let mut set: c::fd_set = unsafe { mem::init() };
c::fd_set(&mut set, fd);
match await(fd, &mut set, timeout_ms) {
0 => Err(timeout("connection timed out")),
-1 => Err(last_error()),
_ => {
let err: libc::c_int = try!(
net::getsockopt(fd, libc::SOL_SOCKET, libc::SO_ERROR));
if err == 0 {
Ok(())
} else {
Err(io::IoError::from_errno(err as uint, true))
}
}
}
}
-1 => Err(last_error()),
_ => Ok(()),
};
// be sure to turn blocking I/O back on
try!(set_nonblocking(fd, false));
return ret;
#[cfg(unix)]
fn set_nonblocking(fd: net::sock_t, nb: bool) -> IoResult<()> {
let set = nb as libc::c_int;
super::mkerr_libc(retry(|| unsafe { c::ioctl(fd, c::FIONBIO, &set) }))
}
#[cfg(windows)]
fn set_nonblocking(fd: net::sock_t, nb: bool) -> IoResult<()> {
let mut set = nb as libc::c_ulong;
if unsafe { c::ioctlsocket(fd, c::FIONBIO, &mut set) != 0 } {
Err(last_error())
} else {
Ok(())
}
}
#[cfg(unix)]
fn await(fd: net::sock_t, set: &mut c::fd_set,
timeout: u64) -> libc::c_int {
let start = ::io::timer::now();
retry(|| unsafe {
// Recalculate the timeout each iteration (it is generally
// undefined what the value of the 'tv' is after select
// returns EINTR).
let tv = ms_to_timeval(timeout - (::io::timer::now() - start));
c::select(fd + 1, ptr::null(), set as *mut _ as *_,
ptr::null(), &tv)
})
}
#[cfg(windows)]
fn await(_fd: net::sock_t, set: &mut c::fd_set,
timeout: u64) -> libc::c_int {
let tv = ms_to_timeval(timeout);
unsafe { c::select(1, ptr::null(), &*set, ptr::null(), &tv) }
}
}
pub fn accept_deadline(fd: net::sock_t, deadline: u64) -> IoResult<()> {
let mut set: c::fd_set = unsafe { mem::init() };
c::fd_set(&mut set, fd);
match retry(|| {
// If we're past the deadline, then pass a 0 timeout to select() so
// we can poll the status of the socket.
let now = ::io::timer::now();
let ms = if deadline < now {0} else {deadline - now};
let tv = ms_to_timeval(ms);
let n = if cfg!(windows) {1} else {fd as libc::c_int + 1};
unsafe { c::select(n, &set, ptr::null(), ptr::null(), &tv) }
}) {
-1 => Err(last_error()),
0 => Err(timeout("accept timed out")),
_ => return Ok(()),
}
}
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