hirun 0.1.16

A concurrent framework for asynchronous programming based on event-driven, non-blocking I/O mechanism
Documentation 
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use super::{const_buf, mut_buf, IoVec, IoVecMut};
use crate::{Error, Result};
use core::ptr;

pub struct Fd {
    pub(crate) fd: i32,
}

impl Fd {
    pub fn new(fd: i32) -> Self {
        Self { fd }
    }

    pub fn fd(&self) -> i32 {
        self.fd
    }

    pub fn close(&mut self) {
        unsafe { libc::close(self.fd) };
        self.fd = -1;
    }

    pub fn try_read(&self, buf: &mut [u8]) -> Result<usize> {
        loop {
            let ret = unsafe { libc::read(self.fd, mut_buf(buf), buf.len()) };
            if ret >= 0 {
                return Ok(ret as usize);
            } else {
                let err = Error::last();
                if err.errno != libc::EINTR {
                    return Err(err);
                }
            }
        }
    }

    pub fn try_write(&self, buf: &[u8]) -> Result<usize> {
        loop {
            let ret = unsafe { libc::write(self.fd, const_buf(buf), buf.len()) };
            if ret >= 0 {
                return Ok(ret as usize);
            } else {
                let err = Error::last();
                if err.errno != libc::EINTR {
                    return Err(err);
                }
            }
        }
    }

    pub fn try_sendfile(&self, in_fd: i32, off: usize, count: usize) -> Result<usize> {
        let mut off = off as i64;
        loop {
            let ret = unsafe { libc::sendfile(self.fd, in_fd, &mut off, count) };
            if ret >= 0 {
                return Ok(ret as usize);
            } else {
                let err = Error::last();
                if err.errno != libc::EINTR {
                    return Err(err);
                }
            }
        }
    }

    /// off表示写入数据在buf中的起始偏移
    pub fn try_readv(&self, fd: i32, buf: &[&mut [u8]], off: usize) -> Result<usize> {
        let iovec = &mut [libc::iovec {
            iov_base: ptr::null_mut(),
            iov_len: 0,
        }; 64];
        let mut buf = IoVecMut::new(buf, off);
        let mut bytes = 0_usize;
        'top: while let Some((piovec, iovcnt, size)) = buf.to_iovec(iovec) {
            loop {
                let ret = unsafe { libc::readv(fd, piovec, iovcnt) };
                if ret > 0 {
                    bytes += ret as usize;
                    if ret as usize == size {
                        buf = buf.next_iovec(iovcnt as usize);
                    } else {
                        buf = buf.next_bytes(ret as usize);
                    }
                    continue 'top;
                } else if ret == 0 {
                    break 'top;
                } else {
                    let errno = Error::last().errno;
                    match errno {
                        hierr::EAGAIN => break 'top,
                        hierr::EINTR => continue,
                        _ if bytes > 0 => break 'top,
                        _ => return Err(Error::new(errno)),
                    }
                }
            }
        }
        Ok(bytes)
    }

    /// off表示发送数据在buf中的起始偏移
    pub fn try_writev(&self, fd: i32, buf: &[&[u8]], off: usize) -> Result<usize> {
        let iovec = &mut [libc::iovec {
            iov_base: ptr::null_mut(),
            iov_len: 0,
        }; 64];
        let mut buf = IoVec::new(buf, off);
        let mut bytes = 0_usize;
        'top: while let Some((piovec, iovcnt, size)) = buf.to_iovec(iovec) {
            loop {
                let ret = unsafe { libc::writev(fd, piovec, iovcnt) };
                if ret > 0 {
                    bytes += ret as usize;
                    if ret as usize == size {
                        buf = buf.next_iovec(iovcnt as usize);
                    } else {
                        buf = buf.next_bytes(ret as usize);
                    }
                    continue 'top;
                } else {
                    let errno = Error::last().errno;
                    match errno {
                        hierr::EAGAIN => break 'top,
                        hierr::EINTR => continue,
                        _ if bytes > 0 => break 'top,
                        _ => return Err(Error::new(errno)),
                    }
                }
            }
        }
        Ok(bytes)
    }
}

impl Clone for Fd {
    fn clone(&self) -> Self {
        Self {
            fd: unsafe { libc::dup(self.fd) },
        }
    }
}

impl Drop for Fd {
    fn drop(&mut self) {
        unsafe { libc::close(self.fd) };
    }
}