MMapError

pub const MMapError = error{
    /// The underlying filesystem of the specified file does not support memory mapping.
    MemoryMappingNotSupported,

    /// A file descriptor refers to a non-regular file. Or a file mapping was requested,
    /// but the file descriptor is not open for reading. Or `MAP.SHARED` was requested
    /// and `PROT_WRITE` is set, but the file descriptor is not open in `RDWR` mode.
    /// Or `PROT_WRITE` is set, but the file is append-only.
    AccessDenied,

    /// The `prot` argument asks for `PROT_EXEC` but the mapped area belongs to a file on
    /// a filesystem that was mounted no-exec.
    PermissionDenied,
    LockedMemoryLimitExceeded,
    ProcessFdQuotaExceeded,
    SystemFdQuotaExceeded,
    OutOfMemory,

    /// Using FIXED_NOREPLACE flag and the process has already mapped memory at the given address
    MappingAlreadyExists,
} || UnexpectedError