106 lines
2.9 KiB
Rust
106 lines
2.9 KiB
Rust
// DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
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// Version 2, December 2004
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//
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// Copyleft (ↄ) meh. <meh@schizofreni.co> | http://meh.schizofreni.co
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//
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// Everyone is permitted to copy and distribute verbatim or modified
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// copies of this license document, and changing it is allowed as long
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// as the name is changed.
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//
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// DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
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// TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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//
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// 0. You just DO WHAT THE FUCK YOU WANT TO.
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use std::io::{self, Read, Write};
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use std::mem;
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use std::os::unix::io::{AsRawFd, RawFd};
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use std::sync::Arc;
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use crate::platform::posix::Fd;
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use libc;
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/// Read-only end for a file descriptor.
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pub struct Reader(pub(crate) Arc<Fd>);
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/// Write-only end for a file descriptor.
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pub struct Writer(pub(crate) Arc<Fd>);
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impl Read for Reader {
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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unsafe {
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let amount = libc::read(self.0.as_raw_fd(), buf.as_mut_ptr() as *mut _, buf.len());
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if amount < 0 {
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return Err(io::Error::last_os_error());
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}
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Ok(amount as usize)
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}
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}
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fn read_vectored(&mut self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> {
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unsafe {
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let mut msg: libc::msghdr = mem::zeroed();
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// msg.msg_name: NULL
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// msg.msg_namelen: 0
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msg.msg_iov = bufs.as_mut_ptr().cast();
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msg.msg_iovlen = bufs.len().min(libc::c_int::MAX as usize) as _;
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let n = libc::recvmsg(self.0.as_raw_fd(), &mut msg, 0);
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if n < 0 {
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return Err(io::Error::last_os_error());
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}
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Ok(n as usize)
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}
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}
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}
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impl Write for Writer {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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unsafe {
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let amount = libc::write(self.0.as_raw_fd(), buf.as_ptr() as *const _, buf.len());
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if amount < 0 {
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return Err(io::Error::last_os_error());
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}
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Ok(amount as usize)
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}
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}
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fn flush(&mut self) -> io::Result<()> {
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Ok(())
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}
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fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
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unsafe {
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let mut msg: libc::msghdr = mem::zeroed();
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// msg.msg_name = NULL
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// msg.msg_namelen = 0
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msg.msg_iov = bufs.as_ptr() as *mut _;
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msg.msg_iovlen = bufs.len().min(libc::c_int::MAX as usize) as _;
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let n = libc::sendmsg(self.0.as_raw_fd(), &msg, 0);
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if n < 0 {
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return Err(io::Error::last_os_error());
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}
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Ok(n as usize)
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}
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}
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}
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impl AsRawFd for Reader {
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fn as_raw_fd(&self) -> RawFd {
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self.0.as_raw_fd()
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}
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}
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impl AsRawFd for Writer {
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fn as_raw_fd(&self) -> RawFd {
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self.0.as_raw_fd()
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}
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}
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