Function lmdb_sys::mdb_env_copyfd2

pub unsafe extern "C" fn mdb_env_copyfd2(
    env: *mut MDB_env, 
    fd: mdb_filehandle_t, 
    flags: c_uint
) -> c_int

@brief Copy an LMDB environment to the specified file descriptor, with options.

This function may be used to make a backup of an existing environment. No lockfile is created, since it gets recreated at need. See #mdb_env_copy2() for further details. @note This call can trigger significant file size growth if run in parallel with write transactions, because it employs a read-only transaction. See long-lived transactions under @ref caveats_sec. @param[in] env An environment handle returned by #mdb_env_create(). It must have already been opened successfully. @param[in] fd The filedescriptor to write the copy to. It must have already been opened for Write access. @param[in] flags Special options for this operation. See #mdb_env_copy2() for options. @return A non-zero error value on failure and 0 on success.