nc 0.9.8

Access system calls directly
Documentation 
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/// Get the list of allowed `fcntl()` commands if a file descriptor
/// is granted the CAP_FCNTL capability right,
pub unsafe fn cap_fcntls_get(fd: i32, fcntl_rights: &mut u32) -> Result<(), Errno> {
    let fd = fd as usize;
    let fcntl_rights_ptr = core::ptr::from_mut(fcntl_rights) as usize;
    unsafe { syscall2(SYS_CAP_FCNTLS_GET, fd, fcntl_rights_ptr).map(drop) }
}