sgx_tstd/src/sys/stdio.rs

// Copyright (C) 2017-2018 Baidu, Inc. All Rights Reserved.
//
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// modification, are permitted provided that the following conditions
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//
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//    notice, this list of conditions and the following disclaimer.
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//    notice, this list of conditions and the following disclaimer in
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//    distribution.
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use io;
use sgx_trts::libc;
use sys::fd::FileDesc;

pub struct Stdin(());
pub struct Stdout(());
pub struct Stderr(());

impl Stdin {
    pub fn new() -> io::Result<Stdin> { Ok(Stdin(())) }

    pub fn read(&self, data: &mut [u8]) -> io::Result<usize> {
        let fd = FileDesc::new(libc::STDIN_FILENO);
        let ret = fd.read(data);
        fd.into_raw();
        ret
    }
}

impl Stdout {
    pub fn new() -> io::Result<Stdout> { Ok(Stdout(())) }

    pub fn write(&self, data: &[u8]) -> io::Result<usize> {
        let fd = FileDesc::new(libc::STDOUT_FILENO);
        let ret = fd.write(data);
        fd.into_raw();
        ret
    }

    pub fn flush(&self) -> io::Result<()> {
        Ok(())
    }
}

impl Stderr {
    pub fn new() -> io::Result<Stderr> { Ok(Stderr(())) }

    pub fn write(&self, data: &[u8]) -> io::Result<usize> {
        let fd = FileDesc::new(libc::STDERR_FILENO);
        let ret = fd.write(data);
        fd.into_raw();
        ret
    }

    pub fn flush(&self) -> io::Result<()> {
        Ok(())
    }
}

// FIXME: right now this raw stderr handle is used in a few places because
//        std::io::stderr_raw isn't exposed, but once that's exposed this impl
//        should go away
impl io::Write for Stderr {
    fn write(&mut self, data: &[u8]) -> io::Result<usize> {
        Stderr::write(self, data)
    }

    fn flush(&mut self) -> io::Result<()> {
        Stderr::flush(self)
    }
}

pub fn is_ebadf(err: &io::Error) -> bool {
    err.raw_os_error() == Some(libc::EBADF as i32)
}

pub const STDIN_BUF_SIZE: usize = ::sys_common::io::DEFAULT_BUF_SIZE;

pub fn stderr_prints_nothing() -> bool {
    false
}