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use nix::sys::uio::*;
use nix::unistd::*;
use rand::{thread_rng, Rng};
use std::{cmp, iter};
use std::fs::{OpenOptions, remove_file};
use std::os::unix::io::AsRawFd;
#[test]
fn test_writev() {
let mut to_write = Vec::with_capacity(16 * 128);
for _ in 0..16 {
let s: String = thread_rng().gen_ascii_chars().take(128).collect();
let b = s.as_bytes();
to_write.extend(b.iter().map(|x| x.clone()));
}
// Allocate and fill iovecs
let mut iovecs = Vec::new();
let mut consumed = 0;
while consumed < to_write.len() {
let left = to_write.len() - consumed;
let slice_len = if left <= 64 { left } else { thread_rng().gen_range(64, cmp::min(256, left)) };
let b = &to_write[consumed..consumed+slice_len];
iovecs.push(IoVec::from_slice(b));
consumed += slice_len;
}
let pipe_res = pipe();
assert!(pipe_res.is_ok());
let (reader, writer) = pipe_res.ok().unwrap();
// FileDesc will close its filedesc (reader).
let mut read_buf: Vec<u8> = iter::repeat(0u8).take(128 * 16).collect();
// Blocking io, should write all data.
let write_res = writev(writer, &iovecs);
// Successful write
assert!(write_res.is_ok());
let written = write_res.ok().unwrap();
// Check whether we written all data
assert_eq!(to_write.len(), written);
let read_res = read(reader, &mut read_buf[..]);
// Successful read
assert!(read_res.is_ok());
let read = read_res.ok().unwrap() as usize;
// Check we have read as much as we written
assert_eq!(read, written);
// Check equality of written and read data
assert_eq!(&to_write, &read_buf);
let close_res = close(writer);
assert!(close_res.is_ok());
let close_res = close(reader);
assert!(close_res.is_ok());
}
#[test]
fn test_readv() {
let s:String = thread_rng().gen_ascii_chars().take(128).collect();
let to_write = s.as_bytes().to_vec();
let mut storage = Vec::new();
let mut allocated = 0;
while allocated < to_write.len() {
let left = to_write.len() - allocated;
let vec_len = if left <= 64 { left } else { thread_rng().gen_range(64, cmp::min(256, left)) };
let v: Vec<u8> = iter::repeat(0u8).take(vec_len).collect();
storage.push(v);
allocated += vec_len;
}
let mut iovecs = Vec::with_capacity(storage.len());
for v in storage.iter_mut() {
iovecs.push(IoVec::from_mut_slice(&mut v[..]));
}
let pipe_res = pipe();
assert!(pipe_res.is_ok());
let (reader, writer) = pipe_res.ok().unwrap();
// Blocking io, should write all data.
let write_res = write(writer, &to_write);
// Successful write
assert!(write_res.is_ok());
let read_res = readv(reader, &mut iovecs[..]);
assert!(read_res.is_ok());
let read = read_res.ok().unwrap();
// Check whether we've read all data
assert_eq!(to_write.len(), read);
// Cccumulate data from iovecs
let mut read_buf = Vec::with_capacity(to_write.len());
for iovec in iovecs.iter() {
read_buf.extend(iovec.as_slice().iter().map(|x| x.clone()));
}
// Check whether iovecs contain all written data
assert_eq!(read_buf.len(), to_write.len());
// Check equality of written and read data
assert_eq!(&read_buf, &to_write);
let close_res = close(reader);
assert!(close_res.is_ok());
let close_res = close(writer);
assert!(close_res.is_ok());
}
#[test]
fn test_pwrite() {
use std::io::Read;
let path = "pwrite_test_file";
let mut file = OpenOptions::new().write(true).read(true).create(true)
.truncate(true).open(path).unwrap();
let buf = [1u8;8];
assert_eq!(Ok(8), pwrite(file.as_raw_fd(), &buf, 8));
let mut file_content = Vec::new();
file.read_to_end(&mut file_content).unwrap();
let mut expected = vec![0u8;8];
expected.extend(vec![1;8]);
assert_eq!(file_content, expected);
remove_file(path).unwrap();
}
#[test]
fn test_pread() {
use std::io::Write;
let path = "pread_test_file";
let mut file = OpenOptions::new().write(true).read(true).create(true)
.truncate(true).open(path).unwrap();
let file_content: Vec<u8> = (0..64).collect();
file.write_all(&file_content).unwrap();
let mut buf = [0u8;16];
assert_eq!(Ok(16), pread(file.as_raw_fd(), &mut buf, 16));
let expected: Vec<_> = (16..32).collect();
assert_eq!(&buf[..], &expected[..]);
remove_file(path).unwrap();
}
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