nc 0.9.8

Access system calls directly
Documentation 
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/// Seals the VM's metadata from selected syscalls.
///
/// - addr/len: VM address range.
pub unsafe fn mseal(
    start: *const core::ffi::c_void,
    len: size_t,
    flags: usize,
) -> Result<(), Errno> {
    let start = start as usize;
    unsafe { syscall3(SYS_MSEAL, start, len, flags).map(drop) }
}