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use nix::fcntl::{openat, open, OFlag, readlink, readlinkat};
use nix::sys::stat::Mode;
use nix::unistd::{close, read};
use tempdir::TempDir;
use tempfile::NamedTempFile;
use std::io::prelude::*;
use std::os::unix::fs;
#[test]
fn test_openat() {
const CONTENTS: &[u8] = b"abcd";
let mut tmp = NamedTempFile::new().unwrap();
tmp.write_all(CONTENTS).unwrap();
let dirfd = open(tmp.path().parent().unwrap(),
OFlag::empty(),
Mode::empty()).unwrap();
let fd = openat(dirfd,
tmp.path().file_name().unwrap(),
OFlag::O_RDONLY,
Mode::empty()).unwrap();
let mut buf = [0u8; 1024];
assert_eq!(4, read(fd, &mut buf).unwrap());
assert_eq!(CONTENTS, &buf[0..4]);
close(fd).unwrap();
close(dirfd).unwrap();
}
#[test]
fn test_readlink() {
let tempdir = TempDir::new("nix-test_readdir")
.unwrap_or_else(|e| panic!("tempdir failed: {}", e));
let src = tempdir.path().join("a");
let dst = tempdir.path().join("b");
println!("a: {:?}, b: {:?}", &src, &dst);
fs::symlink(&src.as_path(), &dst.as_path()).unwrap();
let dirfd = open(tempdir.path(),
OFlag::empty(),
Mode::empty()).unwrap();
let mut buf = vec![0; src.to_str().unwrap().len() + 1];
assert_eq!(readlink(&dst, &mut buf).unwrap().to_str().unwrap(),
src.to_str().unwrap());
assert_eq!(readlinkat(dirfd, "b", &mut buf).unwrap().to_str().unwrap(),
src.to_str().unwrap());
}
#[cfg(any(target_os = "linux", target_os = "android"))]
mod linux_android {
use std::io::prelude::*;
use std::os::unix::prelude::*;
use libc::loff_t;
use nix::fcntl::{SpliceFFlags, FallocateFlags, fallocate, splice, tee, vmsplice};
use nix::sys::uio::IoVec;
use nix::unistd::{close, pipe, read, write};
use tempfile::{tempfile, NamedTempFile};
#[test]
fn test_splice() {
const CONTENTS: &[u8] = b"abcdef123456";
let mut tmp = tempfile().unwrap();
tmp.write_all(CONTENTS).unwrap();
let (rd, wr) = pipe().unwrap();
let mut offset: loff_t = 5;
let res = splice(tmp.as_raw_fd(), Some(&mut offset),
wr, None, 2, SpliceFFlags::empty()).unwrap();
assert_eq!(2, res);
let mut buf = [0u8; 1024];
assert_eq!(2, read(rd, &mut buf).unwrap());
assert_eq!(b"f1", &buf[0..2]);
assert_eq!(7, offset);
close(rd).unwrap();
close(wr).unwrap();
}
#[test]
fn test_tee() {
let (rd1, wr1) = pipe().unwrap();
let (rd2, wr2) = pipe().unwrap();
write(wr1, b"abc").unwrap();
let res = tee(rd1, wr2, 2, SpliceFFlags::empty()).unwrap();
assert_eq!(2, res);
let mut buf = [0u8; 1024];
// Check the tee'd bytes are at rd2.
assert_eq!(2, read(rd2, &mut buf).unwrap());
assert_eq!(b"ab", &buf[0..2]);
// Check all the bytes are still at rd1.
assert_eq!(3, read(rd1, &mut buf).unwrap());
assert_eq!(b"abc", &buf[0..3]);
close(rd1).unwrap();
close(wr1).unwrap();
close(rd2).unwrap();
close(wr2).unwrap();
}
#[test]
fn test_vmsplice() {
let (rd, wr) = pipe().unwrap();
let buf1 = b"abcdef";
let buf2 = b"defghi";
let mut iovecs = Vec::with_capacity(2);
iovecs.push(IoVec::from_slice(&buf1[0..3]));
iovecs.push(IoVec::from_slice(&buf2[0..3]));
let res = vmsplice(wr, &iovecs[..], SpliceFFlags::empty()).unwrap();
assert_eq!(6, res);
// Check the bytes can be read at rd.
let mut buf = [0u8; 32];
assert_eq!(6, read(rd, &mut buf).unwrap());
assert_eq!(b"abcdef", &buf[0..6]);
close(rd).unwrap();
close(wr).unwrap();
}
#[test]
fn test_fallocate() {
let tmp = NamedTempFile::new().unwrap();
let fd = tmp.as_raw_fd();
fallocate(fd, FallocateFlags::empty(), 0, 100).unwrap();
// Check if we read exactly 100 bytes
let mut buf = [0u8; 200];
assert_eq!(100, read(fd, &mut buf).unwrap());
}
}
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