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//! `ioctl` opcode behavior for BSD platforms.
use super::{Direction, RawOpcode};
pub(super) const fn compose_opcode(
dir: Direction,
group: RawOpcode,
num: RawOpcode,
size: RawOpcode,
) -> RawOpcode {
let dir = match dir {
Direction::None => NONE,
Direction::Read => READ,
Direction::Write => WRITE,
Direction::ReadWrite => READ | WRITE,
};
dir | num | (group << 8) | ((size & IOCPARAM_MASK) << 16)
}
// `IOC_VOID`
pub const NONE: RawOpcode = 0x2000_0000;
// `IOC_OUT` ("out" is from the perspective of the kernel)
pub const READ: RawOpcode = 0x4000_0000;
// `IOC_IN`
pub const WRITE: RawOpcode = 0x8000_0000;
pub const IOCPARAM_MASK: RawOpcode = 0x1FFF;