Function mq_timedreceive

pub unsafe fn mq_timedreceive(
    mqdes: i32,
    msg: &mut [u8],
    msg_prio: &mut u32,
    abs_timeout: &timespec_t,
) -> Result<isize, i32> 

Available on crate feature dep_nc only.

Receive a message from a message queue

Examples

let name = "nc-mq-timedreceive";
let ret = unsafe {
    nc::mq_open(
        name,
        nc::O_CREAT | nc::O_RDWR | nc::O_EXCL,
        (nc::S_IRUSR | nc::S_IWUSR) as nc::umode_t,
        None,
    )
};
assert!(ret.is_ok());
let mq_id = ret.unwrap();

let mut attr = nc::mq_attr_t::default();
let ret = unsafe { nc::mq_getsetattr(mq_id, None, Some(&mut attr)) };
assert!(ret.is_ok());
println!("attr: {:?}", attr);

let msg = "Hello, Rust";
let prio = 42;
let timeout = nc::timespec_t {
    tv_sec: 1,
    tv_nsec: 0,
};
let ret = unsafe { nc::mq_timedsend(mq_id, msg.as_bytes(), prio, &timeout) };
assert!(ret.is_ok());

let ret = unsafe { nc::mq_getsetattr(mq_id, None, Some(&mut attr)) };
assert!(ret.is_ok());
assert_eq!(attr.mq_curmsgs, 1);

let mut buf = vec![0_u8; attr.mq_msgsize as usize];
let mut recv_prio = 0;
let read_timeout = nc::timespec_t {
    tv_sec: 1,
    tv_nsec: 0,
};
let ret = unsafe { nc::mq_timedreceive(mq_id, &mut buf, &mut recv_prio, &read_timeout) };
if let Err(errno) = ret {
    eprintln!("mq_timedreceive() error: {}", nc::strerror(errno));
}
assert!(ret.is_ok());
let n_read = ret.unwrap() as usize;
assert_eq!(n_read, msg.len());

let ret = unsafe { nc::close(mq_id) };
assert!(ret.is_ok());
let ret = unsafe { nc::mq_unlink(name) };
assert!(ret.is_ok());