CopyFileRangeError

pub const CopyFileRangeError = std.posix.UnexpectedError || error{
    /// One of:
    /// * One or more file descriptors are not valid.
    /// * fd_in is not open for reading; or fd_out is not open for writing.
    /// * The O_APPEND flag is set for the open file description referred
    /// to by the file descriptor fd_out.
    BadFileFlags,
    /// One of:
    /// * An attempt was made to write at a position past the maximum file
    ///   offset the kernel supports.
    /// * An attempt was made to write a range that exceeds the allowed
    ///   maximum file size. The maximum file size differs between
    ///   filesystem implementations and can be different from the maximum
    ///   allowed file offset.
    /// * An attempt was made to write beyond the process's file size
    ///   resource limit. This may also result in the process receiving a
    ///   SIGXFSZ signal.
    FileTooBig,
    /// One of:
    /// * either fd_in or fd_out is not a regular file
    /// * flags argument is not zero
    /// * fd_in and fd_out refer to the same file and the source and target ranges overlap.
    InvalidArguments,
    /// A low-level I/O error occurred while copying.
    InputOutput,
    /// Either fd_in or fd_out refers to a directory.
    IsDir,
    OutOfMemory,
    /// There is not enough space on the target filesystem to complete the copy.
    NoSpaceLeft,
    /// (since Linux 5.19) the filesystem does not support this operation.
    OperationNotSupported,
    /// The requested source or destination range is too large to represent
    /// in the specified data types.
    Overflow,
    /// fd_out refers to an immutable file.
    PermissionDenied,
    /// Either fd_in or fd_out refers to an active swap file.
    SwapFile,
    /// The files referred to by fd_in and fd_out are not on the same
    /// filesystem, and the source and target filesystems are not of the
    /// same type, or do not support cross-filesystem copy.
    NotSameFileSystem,
}