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extend pipe size if possible #83

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extend pipe size if possible #83

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10 changes: 6 additions & 4 deletions src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,23 +13,25 @@ use std::fs::File;
use std::io;
use std::os::unix::io::{AsRawFd, RawFd};

use nix::fcntl::{splice, SpliceFFlags};
use nix::fcntl::{fcntl, FcntlArg, splice, SpliceFFlags};
use nix::unistd::pipe;

const BUF_SIZE: usize = 16384;
const MAX_ROOTLESS_PIPE_SIZE: usize = 1024 * 1024;

#[inline]
fn cat<T: AsRawFd>(input: &T, pipe_rd: RawFd, pipe_wr: RawFd) {
let stdout = io::stdout();
let _handle = stdout.lock();

let _ = fcntl(pipe_wr, FcntlArg::F_SETPIPE_SZ(MAX_ROOTLESS_PIPE_SIZE as i32));

loop {
let res = splice(
input.as_raw_fd(),
None,
pipe_wr,
None,
BUF_SIZE,
MAX_ROOTLESS_PIPE_SIZE,
SpliceFFlags::empty(),
)
.unwrap();
Expand All @@ -45,7 +47,7 @@ fn cat<T: AsRawFd>(input: &T, pipe_rd: RawFd, pipe_wr: RawFd) {
None,
stdout.as_raw_fd(),
None,
BUF_SIZE,
MAX_ROOTLESS_PIPE_SIZE,
SpliceFFlags::empty(),
)
.unwrap();
Expand Down