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#[cfg(feature = "fs")]
#[test]
fn test_seals() {
use rustix::fd::FromFd;
use rustix::fs::{
fcntl_add_seals, fcntl_get_seals, ftruncate, memfd_create, MemfdFlags, SealFlags,
};
use std::fs::File;
use std::io::Write;
let fd = match memfd_create("test", MemfdFlags::CLOEXEC | MemfdFlags::ALLOW_SEALING) {
Ok(fd) => fd,
Err(rustix::io::Errno::NOSYS) => return,
Err(err) => Err(err).unwrap(),
};
let mut file = File::from_fd(fd.into());
let old = fcntl_get_seals(&file).unwrap();
assert_eq!(old, SealFlags::empty());
writeln!(&mut file, "Hello!").unwrap();
fcntl_add_seals(&file, SealFlags::GROW).unwrap();
let now = fcntl_get_seals(&file).unwrap();
assert_eq!(now, SealFlags::GROW);
// We sealed growing, so this should fail.
writeln!(&mut file, "World?").unwrap_err();
// We can still shrink for now.
ftruncate(&mut file, 1).unwrap();
fcntl_add_seals(&file, SealFlags::SHRINK).unwrap();
let now = fcntl_get_seals(&file).unwrap();
assert_eq!(now, SealFlags::GROW | SealFlags::SHRINK);
// We sealed shrinking, so this should fail.
ftruncate(&mut file, 0).unwrap_err();
}
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