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use nix::mqueue::{mq_open, mq_close, mq_send, mq_receive};
use nix::mqueue::{O_CREAT, O_WRONLY, O_RDONLY};
use nix::mqueue::MqAttr;
use nix::sys::stat::{S_IWUSR, S_IRUSR, S_IRGRP, S_IROTH};
use std::ffi::CString;
use std::str;
use libc::c_long;
use nix::unistd::{fork, read, write, pipe};
use nix::unistd::Fork::{Child, Parent};
use nix::sys::wait::*;
#[test]
fn mq_send_and_receive() {
const MSG_SIZE: c_long = 32;
let attr = MqAttr { mq_flags: 0, mq_maxmsg: 10, mq_msgsize: MSG_SIZE, mq_curmsgs: 0 };
let mq_name_in_parent = &CString::new(b"/a_nix_test_queue".as_ref()).unwrap();
let mqd_in_parent = mq_open(mq_name_in_parent, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH, &attr).unwrap();
let msg_to_send = &CString::new("msg_1").unwrap();
mq_send(mqd_in_parent, msg_to_send, 1).unwrap();
let (reader, writer) = pipe().unwrap();
let pid = fork();
match pid {
Ok(Child) => {
let mq_name_in_child = &CString::new(b"/a_nix_test_queue".as_ref()).unwrap();
let mqd_in_child = mq_open(mq_name_in_child, O_CREAT | O_RDONLY, S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH, &attr).unwrap();
let mut buf = [0u8; 32];
mq_receive(mqd_in_child, &mut buf, 1).unwrap();
write(writer, &buf).unwrap(); // pipe result to parent process. Otherwise cargo does not report test failures correctly
mq_close(mqd_in_child).unwrap();
}
Ok(Parent(child_pid)) => {
mq_close(mqd_in_parent).unwrap();
// Wait for the child to exit.
waitpid(child_pid, None).unwrap();
// Read 1024 bytes.
let mut read_buf = [0u8; 32];
read(reader, &mut read_buf).unwrap();
let message_str = str::from_utf8(&read_buf).unwrap();
assert_eq!(&message_str[.. message_str.char_indices().nth(5).unwrap().0], "msg_1");
},
// panic, fork should never fail unless there is a serious problem with the OS
Err(_) => panic!("Error: Fork Failed")
}
}
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