pub unsafe extern "C" fn libssh2_channel_get_exit_signal( chan: *mut LIBSSH2_CHANNEL, exitsignal: *mut *mut c_char, exitsignal_len: *mut size_t, errmsg: *mut *mut c_char, errmsg_len: *mut size_t, langtag: *mut *mut c_char, langtag_len: *mut size_t) -> c_int