Enum nix::sys::socket::ControlMessage

#[non_exhaustive]
pub enum ControlMessage<'a> {
    ScmRights(&'a [RawFd]),
    ScmCredentials(&'a UnixCredentials),
    AlgSetIv(&'a [u8]),
    AlgSetOp(&'a c_int),
    AlgSetAeadAssoclen(&'a u32),
    Ipv4PacketInfo(&'a in_pktinfo),
    Ipv6PacketInfo(&'a in6_pktinfo),
    RxqOvfl(&'a u32),
}

Available on crate features socket and uio only.

A type-safe zero-copy wrapper around a single control message, as used wih sendmsg. More types may be added to this enum; do not exhaustively pattern-match it.

Further reading

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ScmRights(&'a [RawFd])

A message of type SCM_RIGHTS, containing an array of file descriptors passed between processes.

See the description in the “Ancillary messages” section of the unix(7) man page.

Using multiple ScmRights messages for a single sendmsg call isn’t recommended since it causes platform-dependent behaviour: It might swallow all but the first ScmRights message or fail with EINVAL. Instead, you can put all fds to be passed into a single ScmRights message.

ScmCredentials(&'a UnixCredentials)

A message of type SCM_CREDENTIALS, containing the pid, uid and gid of a process connected to the socket.

This is similar to the socket option SO_PEERCRED, but requires a process to explicitly send its credentials. A process running as root is allowed to specify any credentials, while credentials sent by other processes are verified by the kernel.

For further information, please refer to the unix(7) man page.

AlgSetIv(&'a [u8])

Set IV for AF_ALG crypto API.

For further information, please refer to the documentation

AlgSetOp(&'a c_int)

Set crypto operation for AF_ALG crypto API. It may be one of ALG_OP_ENCRYPT or ALG_OP_DECRYPT

For further information, please refer to the documentation

AlgSetAeadAssoclen(&'a u32)

Set the length of associated authentication data (AAD) (applicable only to AEAD algorithms) for AF_ALG crypto API.

For further information, please refer to the documentation

Ipv4PacketInfo(&'a in_pktinfo)

Available on crate feature net only.

Configure the sending addressing and interface for v4

For further information, please refer to the ip(7) man page.

Ipv6PacketInfo(&'a in6_pktinfo)

Available on crate feature net only.

Configure the sending addressing and interface for v6

For further information, please refer to the ipv6(7) man page.

RxqOvfl(&'a u32)

SO_RXQ_OVFL indicates that an unsigned 32 bit value ancilliary msg (cmsg) should be attached to recieved skbs indicating the number of packets dropped by the socket between the last recieved packet and this received packet.

Trait Implementations

impl<'a> Clone for ControlMessage<'a>

fn clone(&self) -> ControlMessage<'a>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for ControlMessage<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> PartialEq<ControlMessage<'a>> for ControlMessage<'a>

fn eq(&self, other: &ControlMessage<'a>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> Copy for ControlMessage<'a>

impl<'a> Eq for ControlMessage<'a>

impl<'a> StructuralEq for ControlMessage<'a>

impl<'a> StructuralPartialEq for ControlMessage<'a>