Function nc::shmat

pub fn shmat(shmid: i32, shmaddr: usize, shmflg: i32) -> Result<usize, Errno>

Attach the System V shared memory segment.

let size = 4 * nc::PAGE_SIZE;
let flags = nc::IPC_CREAT | nc::IPC_EXCL | 0o600;
let ret = nc::shmget(nc::IPC_PRIVATE, size, flags);
assert!(ret.is_ok());
let shmid = ret.unwrap();

let addr: usize = 0;
let ret = nc::shmat(shmid, addr, 0);
assert!(ret.is_ok());
let addr = ret.unwrap();

let mut buf = nc::shmid_ds_t::default();
let ret = nc::shmctl(shmid, nc::IPC_STAT, &mut buf);
assert!(ret.is_ok());

let ret = nc::shmdt(addr);
assert!(ret.is_ok());

let ret = nc::shmctl(shmid, nc::IPC_RMID, &mut buf);
assert!(ret.is_ok());