Error Set EpollCtlError [src]

Errors

FileDescriptorAlreadyPresentInSet

op was EPOLL_CTL_ADD, and the supplied file descriptor fd is already registered with this epoll instance.

FileDescriptorIncompatibleWithEpoll

The target file fd does not support epoll. This error can occur if fd refers to, for example, a regular file or a directory.

FileDescriptorNotRegistered

op was EPOLL_CTL_MOD or EPOLL_CTL_DEL, and fd is not registered with this epoll instance.

OperationCausesCircularLoop

fd refers to an epoll instance and this EPOLL_CTL_ADD operation would result in a circular loop of epoll instances monitoring one another.

SystemResources

There was insufficient memory to handle the requested op control operation.

Unexpected UnexpectedError

The Operating System returned an undocumented error code.

This error is in theory not possible, but it would be better to handle this error than to invoke undefined behavior.

When this error code is observed, it usually means the Zig Standard Library needs a small patch to add the error code to the error set for the respective function.

UserResourceLimitReached

The limit imposed by /proc/sys/fs/epoll/max_user_watches was encountered while trying to register (EPOLL_CTL_ADD) a new file descriptor on an epoll instance. See epoll(7) for further details.

Source

  pub const EpollCtlError = error{
    /// op was EPOLL_CTL_ADD, and the supplied file descriptor fd is  already  registered
    /// with this epoll instance.
    FileDescriptorAlreadyPresentInSet,

    /// fd refers to an epoll instance and this EPOLL_CTL_ADD operation would result in a
    /// circular loop of epoll instances monitoring one another.
    OperationCausesCircularLoop,

    /// op was EPOLL_CTL_MOD or EPOLL_CTL_DEL, and fd is not registered with  this  epoll
    /// instance.
    FileDescriptorNotRegistered,

    /// There was insufficient memory to handle the requested op control operation.
    SystemResources,

    /// The  limit  imposed  by /proc/sys/fs/epoll/max_user_watches was encountered while
    /// trying to register (EPOLL_CTL_ADD) a new file descriptor on  an  epoll  instance.
    /// See epoll(7) for further details.
    UserResourceLimitReached,

    /// The target file fd does not support epoll.  This error can occur if fd refers to,
    /// for example, a regular file or a directory.
    FileDescriptorIncompatibleWithEpoll,
} || UnexpectedError  