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// Copyright 2013 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.
//! Native thread-blocking I/O implementation
//!
//! This module contains the implementation of native thread-blocking
//! implementations of I/O on all platforms. This module is not intended to be
//! used directly, but rather the rust runtime will fall back to using it if
//! necessary.
//!
//! Rust code normally runs inside of green tasks with a local scheduler using
//! asynchronous I/O to cooperate among tasks. This model is not always
//! available, however, and that's where these native implementations come into
//! play. The only dependencies of these modules are the normal system libraries
//! that you would find on the respective platform.
use c_str::CString;
use comm::SharedChan;
use libc::c_int;
use libc;
use option::{Option, None, Some};
use os;
use path::Path;
use result::{Result, Ok, Err};
use rt::rtio;
use rt::rtio::{RtioTcpStream, RtioTcpListener, RtioUdpSocket, RtioUnixListener,
RtioPipe, RtioFileStream, RtioProcess, RtioSignal, RtioTTY,
CloseBehavior, RtioTimer};
use io;
use io::IoError;
use io::net::ip::SocketAddr;
use io::process::ProcessConfig;
use io::signal::Signum;
use ai = io::net::addrinfo;
// Local re-exports
pub use self::file::FileDesc;
pub use self::process::Process;
// Native I/O implementations
pub mod file;
pub mod process;
type IoResult<T> = Result<T, IoError>;
fn unimpl() -> IoError {
IoError {
kind: io::IoUnavailable,
desc: "unimplemented I/O interface",
detail: None,
}
}
fn last_error() -> IoError {
#[cfg(windows)]
fn get_err(errno: i32) -> (io::IoErrorKind, &'static str) {
match errno {
libc::EOF => (io::EndOfFile, "end of file"),
_ => (io::OtherIoError, "unknown error"),
}
}
#[cfg(not(windows))]
fn get_err(errno: i32) -> (io::IoErrorKind, &'static str) {
// XXX: this should probably be a bit more descriptive...
match errno {
libc::EOF => (io::EndOfFile, "end of file"),
// These two constants can have the same value on some systems, but
// different values on others, so we can't use a match clause
x if x == libc::EAGAIN || x == libc::EWOULDBLOCK =>
(io::ResourceUnavailable, "resource temporarily unavailable"),
_ => (io::OtherIoError, "unknown error"),
}
}
let (kind, desc) = get_err(os::errno() as i32);
IoError {
kind: kind,
desc: desc,
detail: Some(os::last_os_error())
}
}
/// Implementation of rt::rtio's IoFactory trait to generate handles to the
/// native I/O functionality.
pub struct IoFactory;
impl rtio::IoFactory for IoFactory {
// networking
fn tcp_connect(&mut self, _addr: SocketAddr) -> IoResult<~RtioTcpStream> {
Err(unimpl())
}
fn tcp_bind(&mut self, _addr: SocketAddr) -> IoResult<~RtioTcpListener> {
Err(unimpl())
}
fn udp_bind(&mut self, _addr: SocketAddr) -> IoResult<~RtioUdpSocket> {
Err(unimpl())
}
fn unix_bind(&mut self, _path: &CString) -> IoResult<~RtioUnixListener> {
Err(unimpl())
}
fn unix_connect(&mut self, _path: &CString) -> IoResult<~RtioPipe> {
Err(unimpl())
}
fn get_host_addresses(&mut self, _host: Option<&str>, _servname: Option<&str>,
_hint: Option<ai::Hint>) -> IoResult<~[ai::Info]> {
Err(unimpl())
}
// filesystem operations
fn fs_from_raw_fd(&mut self, fd: c_int,
close: CloseBehavior) -> ~RtioFileStream {
let close = match close {
rtio::CloseSynchronously | rtio::CloseAsynchronously => true,
rtio::DontClose => false
};
~file::FileDesc::new(fd, close) as ~RtioFileStream
}
fn fs_open(&mut self, _path: &CString, _fm: io::FileMode, _fa: io::FileAccess)
-> IoResult<~RtioFileStream> {
Err(unimpl())
}
fn fs_unlink(&mut self, _path: &CString) -> IoResult<()> {
Err(unimpl())
}
fn fs_stat(&mut self, _path: &CString) -> IoResult<io::FileStat> {
Err(unimpl())
}
fn fs_mkdir(&mut self, _path: &CString,
_mode: io::FilePermission) -> IoResult<()> {
Err(unimpl())
}
fn fs_chmod(&mut self, _path: &CString,
_mode: io::FilePermission) -> IoResult<()> {
Err(unimpl())
}
fn fs_rmdir(&mut self, _path: &CString) -> IoResult<()> {
Err(unimpl())
}
fn fs_rename(&mut self, _path: &CString, _to: &CString) -> IoResult<()> {
Err(unimpl())
}
fn fs_readdir(&mut self, _path: &CString, _flags: c_int) -> IoResult<~[Path]> {
Err(unimpl())
}
fn fs_lstat(&mut self, _path: &CString) -> IoResult<io::FileStat> {
Err(unimpl())
}
fn fs_chown(&mut self, _path: &CString, _uid: int, _gid: int) -> IoResult<()> {
Err(unimpl())
}
fn fs_readlink(&mut self, _path: &CString) -> IoResult<Path> {
Err(unimpl())
}
fn fs_symlink(&mut self, _src: &CString, _dst: &CString) -> IoResult<()> {
Err(unimpl())
}
fn fs_link(&mut self, _src: &CString, _dst: &CString) -> IoResult<()> {
Err(unimpl())
}
fn fs_utime(&mut self, _src: &CString, _atime: u64,
_mtime: u64) -> IoResult<()> {
Err(unimpl())
}
// misc
fn timer_init(&mut self) -> IoResult<~RtioTimer> {
Err(unimpl())
}
fn spawn(&mut self, config: ProcessConfig)
-> IoResult<(~RtioProcess, ~[Option<~RtioPipe>])> {
process::Process::spawn(config).map(|(p, io)| {
(~p as ~RtioProcess,
io.move_iter().map(|p| p.map(|p| ~p as ~RtioPipe)).collect())
})
}
fn pipe_open(&mut self, _fd: c_int) -> IoResult<~RtioPipe> {
Err(unimpl())
}
fn tty_open(&mut self, fd: c_int, _readable: bool) -> IoResult<~RtioTTY> {
if unsafe { libc::isatty(fd) } != 0 {
Ok(~file::FileDesc::new(fd, true) as ~RtioTTY)
} else {
Err(unimpl())
}
}
fn signal(&mut self, _signal: Signum, _channel: SharedChan<Signum>)
-> IoResult<~RtioSignal> {
Err(unimpl())
}
}
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