1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
use std::cmp;
use std::io;
use std::os::unix::io::AsRawFd;
use libc;
use iovec::IoVec;
use iovec::unix as iovec;
pub trait VecIo {
fn readv(&self, bufs: &mut [&mut IoVec]) -> io::Result<usize>;
fn writev(&self, bufs: &[&IoVec]) -> io::Result<usize>;
}
impl<T: AsRawFd> VecIo for T {
fn readv(&self, bufs: &mut [&mut IoVec]) -> io::Result<usize> {
unsafe {
let slice = iovec::as_os_slice_mut(bufs);
let len = cmp::min(<libc::c_int>::max_value() as usize, slice.len());
let rc = libc::readv(self.as_raw_fd(),
slice.as_ptr(),
len as libc::c_int);
if rc < 0 {
Err(io::Error::last_os_error())
} else {
Ok(rc as usize)
}
}
}
fn writev(&self, bufs: &[&IoVec]) -> io::Result<usize> {
unsafe {
let slice = iovec::as_os_slice(bufs);
let len = cmp::min(<libc::c_int>::max_value() as usize, slice.len());
let rc = libc::writev(self.as_raw_fd(),
slice.as_ptr(),
len as libc::c_int);
if rc < 0 {
Err(io::Error::last_os_error())
} else {
Ok(rc as usize)
}
}
}
}