C++ ERROR0函數代碼示例

JNIEXPORT void JNICALL
    Java_com_sun_media_sound_MixerSynth_nDestroySynthesizer(JNIEnv* e, jobject thisObj, jlong id) 
{

    GM_Song			*pSong = (GM_Song *) (INT_PTR) id;

    TRACE0("Java_com_sun_media_sound_MixerSynth_nDestroySynthesizer.\n");

    if (pSong) {

	GM_KillSongNotes(pSong);
	pSong->disposeSongDataWhenDone = TRUE;   // free our midi pointer
	GM_FreeSong((void *)e, pSong);

    } else {

	ERROR0("pSong is NULL\n");
    }

    TRACE0("Java_com_sun_media_sound_MixerSynth_nDestroySynthesizer completed.\n");
}

extern int anongame_wol_matchlist_destroy(void)
{
    t_anongame_wol_player * player;
    t_elem * curr;

    if (anongame_wol_matchlist_head) {
	    LIST_TRAVERSE(anongame_wol_matchlist_head,curr) {
	       if (!(player = (t_anongame_wol_player*)elem_get_data(curr))) { /* should not happen */
		       ERROR0("wol_matchlist contains NULL item");
		       continue;
	       }
	       anongame_wol_player_destroy(player,&curr);
	    }

	    if (list_destroy(anongame_wol_matchlist_head)<0)
            return -1;
        anongame_wol_matchlist_head = NULL;
    }

    return 0;
}

JNIEXPORT jlong JNICALL
    Java_com_sun_media_sound_MidiInDevice_nOpen(JNIEnv* e, jobject thisObj, jint index) {
    MidiDeviceHandle* deviceHandle = NULL;

    TRACE1("Java_com_sun_media_sound_MidiInDevice_nOpen: index: %d\n", index);

#if USE_PLATFORM_MIDI_IN == TRUE
    deviceHandle = MIDI_IN_OpenDevice((INT32) index);
#endif

    // if we didn't get a valid handle, throw a MidiUnavailableException
    // $$kk: 06.24.99: should be getting more information here!
    if ( !deviceHandle ) {
	char *msg = "Failed to open the device.\0";

	ERROR0("Java_com_sun_media_sound_MidiInDevice_nOpen: Failed to open the device\n");
	ThrowJavaMessageException(e, JAVA_MIDI_PACKAGE_NAME"/MidiUnavailableException", msg);
    }
    TRACE0("Java_com_sun_media_sound_MidiInDevice_nOpen succeeded\n");
    return (jlong) (UINT_PTR) deviceHandle;
}

extern int apireglist_destroy(void)
{
    t_apiregmember * apiregmember;
    t_elem * curr;

    if (apireglist_head) {
	    LIST_TRAVERSE(apireglist_head,curr) {
	       if (!(apiregmember = (t_apiregmember*)elem_get_data(curr))) {
		       ERROR0("channel list contains NULL item");
		       continue;
	       }
	       apiregmember_destroy(apiregmember,&curr);
	    }

	    if (list_destroy(apireglist_head)<0)
            return -1;
        apireglist_head = NULL;
    }

    return 0;
}

	char const *
		Directory::read() const
	{
			const char * result;

#ifdef WIN32
			switch (status) {
			default:
			case -1: /* couldn't rewind */
				ERROR0("got status -1");
				return 0;
			case 0: /* freshly opened */
				status = 1;
				if (lFindHandle < 0) return 0;
				result = fileinfo.name;
				break;
			case 1: /* reading */
				if (lFindHandle < 0) return 0;

				if (_findnext(lFindHandle, &fileinfo) < 0) {
					status = 2;
					return 0;
				}
				else result = fileinfo.name;
				break;
			case 2: /* EOF */
				return 0;
			}
#else /* POSIX */
			struct dirent *dentry = dir ? readdir(dir) : 0;
			if (!dentry) return 0;

			result = dentry->d_name;
#endif /* WIN32-POSIX */

			if (!(strcmp(result, ".") && strcmp(result, "..")))
				/* here we presume we don't get an infinite number of "." or ".." ;) */
				return read();
			return result;
		}

// returns -1 on error
int DAUDIO_Write(void* id, char* data, int byteSize) {
    AlsaPcmInfo* info = (AlsaPcmInfo*) id;
    int ret, count;
    snd_pcm_sframes_t frameSize, writtenFrames;

    TRACE1("> DAUDIO_Write %d bytes\n", byteSize);

    /* sanity */
    if (byteSize <= 0 || info->frameSize <= 0) {
        ERROR2(" DAUDIO_Write: byteSize=%d, frameSize=%d!\n",
               (int) byteSize, (int) info->frameSize);
        TRACE0("< DAUDIO_Write returning -1\n");
        return -1;
    }
    count = 2; // maximum number of trials to recover from underrun
    //frameSize = snd_pcm_bytes_to_frames(info->handle, byteSize);
    frameSize = (snd_pcm_sframes_t) (byteSize / info->frameSize);
    do {
        writtenFrames = snd_pcm_writei(info->handle, (const void*) data, (snd_pcm_uframes_t) frameSize);

        if (writtenFrames < 0) {
            ret = xrun_recovery(info, (int) writtenFrames);
            if (ret <= 0) {
                TRACE1("DAUDIO_Write: xrun recovery returned %d -> return.\n", ret);
                return ret;
            }
            if (count-- <= 0) {
                ERROR0("DAUDIO_Write: too many attempts to recover from xrun/suspend\n");
                return -1;
            }
        } else {
            break;
        }
    } while (TRUE);
    //ret =  snd_pcm_frames_to_bytes(info->handle, writtenFrames);
    ret =  (int) (writtenFrames * info->frameSize);
    TRACE1("< DAUDIO_Write: returning %d bytes.\n", ret);
    return ret;
}

static void _handle_stats_request(connection_t *con, 
        http_parser_t *parser, char *uri)
{
    stats_connection_t *stats;

    stats_event_inc(NULL, "stats_connections");
                
    if (!connection_check_admin_pass(parser)) {
        ERROR0("Bad password for stats connection");
        connection_close(con);
        httpp_destroy(parser);
        return;
    }
                    
    stats_event_inc(NULL, "stats");
                    
    /* create stats connection and create stats handler thread */
    stats = (stats_connection_t *)malloc(sizeof(stats_connection_t));
    stats->parser = parser;
    stats->con = con;
                    
    thread_create("Stats Connection", stats_connection, (void *)stats, THREAD_DETACHED);
}

static int _parse_directory (xmlNodePtr node, void *arg)
{
    ice_config_t *config = arg;

    struct cfg_tag icecast_tags[] =
    {
        { "yp-url",         config_get_str, &config->yp_url [config->num_yp_directories]},
        { "yp-url-timeout", config_get_int, &config->yp_url_timeout [config->num_yp_directories]},
        { "touch-interval", config_get_int, &config->yp_touch_interval [config->num_yp_directories]},
        { NULL, NULL, NULL }
    };

    if (config->num_yp_directories >= MAX_YP_DIRECTORIES)
    {
        ERROR0("Maximum number of yp directories exceeded!");
        return -1;
    }

    if (parse_xml_tags (node, icecast_tags))
        return -1;
    config->num_yp_directories++;
    return 0;
}

JNIEXPORT jboolean JNICALL
    Java_com_sun_media_sound_MixerSynth_nStartSynthesizer(JNIEnv* e, jobject thisObj, jlong id) 
{

    OPErr           opErr = NO_ERR;
    GM_Song			*pSong = (GM_Song *) (INT_PTR) id;

    TRACE0("Java_com_sun_media_sound_MixerSynth_nStartSynthesizer.\n");

    // $$kk: 03.23.98: hard coding instrument loading here
    opErr = GM_StartLiveSong(pSong, 1);
 
    if (opErr)
	{
	    ERROR0("FAILED TO START MIDI DIRECT: error on GM_StartLiveSong\n");
	    // $$kk: 09.17.98: what to do here?

	    return (jboolean)FALSE;
	}

    TRACE0("Java_com_sun_media_sound_MixerSynth_nStartSynthesizer.completed\n");
    return (jboolean)TRUE;
}

int
FDWEpollBackend::add(int idx, unsigned rw)
{
//    eventlog(eventlog_level_trace, __FUNCTION__, "called fd: %d rw: %d", fd, rw);

	struct epoll_event tmpev;
	std::memset(&tmpev, 0, sizeof(tmpev));
	tmpev.events = 0;
	if (rw & fdwatch_type_read)
		tmpev.events |= EPOLLIN;
	if (rw & fdwatch_type_write)
		tmpev.events |= EPOLLOUT;

	int op = fdw_rw(fdw_fds + idx) ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;

	tmpev.data.fd = idx;
	if (epoll_ctl(epfd, op, fdw_fd(fdw_fds + idx), &tmpev)) {
		ERROR0("got error from epoll_ctl()");
		return -1;
	}

	return 0;
}

INT32 MIDI_Utils_StopDevice(MacMidiDeviceHandle* handle) {
    OSStatus err = noErr;
    
    if (!handle || !handle->h.deviceHandle) {
        ERROR0("ERROR: MIDI_Utils_StopDevice: handle or native handle is NULL\n");
        return MIDI_INVALID_HANDLE;
    }

    if (handle->isStarted) {
        /* set the flag that we don't want to receive messages anymore */
        handle->isStarted = FALSE;

        if (handle->direction == MIDI_IN) {
            err = MIDIPortDisconnectSource(inPort, (MIDIEndpointRef) (intptr_t) (handle->h.deviceHandle));
        } else if (handle->direction == MIDI_OUT) {
            // Unschedules previously-sent packets.
            err = MIDIFlushOutput((MIDIEndpointRef) (intptr_t) handle->h.deviceHandle);
        }

        MIDI_CHECK_ERROR;
    }
    return MIDI_SUCCESS;
}

// returns java control
static void* CreatePortControl(PortMixer *mixer, PortControlCreator *creator, PortControl::ControlType type,
                               AudioControl **audioControls, int offset, int len) {
    void *jControl = NULL;
    PortControl *control = (PortControl *)calloc(1, sizeof(PortControl));
    float precision = 0.01;

    control->type = type;
    control->controlCount = len;
    control->audioControls = (AudioControl **)malloc(len * sizeof(AudioControl *));
    memcpy(control->audioControls, audioControls + offset, len * sizeof(AudioControl *));

    switch (control->type) {
    case PortControl::Volume:
        jControl = creator->newFloatControl(creator, control, CONTROL_TYPE_VOLUME, 0, 1, precision, "");
        break;
    case PortControl::Mute:
        jControl = creator->newBooleanControl(creator, control, CONTROL_TYPE_MUTE);
        break;
    case PortControl::Balance:
        jControl = creator->newFloatControl(creator, control, CONTROL_TYPE_BALANCE, -1, 1, precision, "");
        break;
    };

    if (jControl == NULL) {
        ERROR0("CreatePortControl: javaControl was not created\n");
        free(control->audioControls);
        free(control);
        return NULL;
    }

    // add the control to mixer control list;
    control->next = mixer->portControls;
    mixer->portControls = control;

    return jControl;
}

int DAUDIO_Flush(void* id, int isSource) {
    DS_Info* info = (DS_Info*) id;

    //TRACE0("DAUDIO_Flush\n");

    if (info->isSource)  {
        info->playBuffer->Stop();
        DS_clearBuffer(info, false /* entire buffer */);
    } else {
        DWORD captureCursor, readCursor;
        /* set the read pointer to the current read position */
        if (FAILED(info->captureBuffer->GetCurrentPosition(&captureCursor, &readCursor))) {
            ERROR0("DAUDIO_Flush: ERROR: Failed to get current position.");
            return false;
        }
        DS_clearBuffer(info, false /* entire buffer */);
        /* SHOULD set to *captureCursor*,
        * but that would be detected as overflow
        * in a subsequent GetAvailable() call.
        */
        info->writePos = (int) readCursor;
    }
    return true;
}

/* a new BOS page has been seen so check which codec it is */
static int process_initial_page (format_plugin_t *plugin, ogg_page *page)
{
    ogg_state_t *ogg_info = plugin->_state;
    ogg_codec_t *codec;

    if (ogg_info->bos_completed)
    {
        ogg_info->bitrate = 0;
        ogg_info->codec_sync = NULL;
        /* need to zap old list of codecs when next group of BOS pages appear */
        free_ogg_codecs (ogg_info);
    }
    do
    {
        codec = initial_vorbis_page (plugin, page);
        if (codec)
            break;
#ifdef HAVE_THEORA
        codec = initial_theora_page (plugin, page);
        if (codec)
            break;
#endif
        /* any others */
        ERROR0 ("Seen BOS page with unknown type");
        return -1;
    } while (0);

    if (codec)
    {
        /* add codec to list */
        codec->next = ogg_info->codecs;
        ogg_info->codecs = codec;
    }

    return 0;
}

static void _parse_directory(xmlDocPtr doc, xmlNodePtr node,
        ice_config_t *configuration)
{
    char *tmp;

    if (configuration->num_yp_directories >= MAX_YP_DIRECTORIES) {
        ERROR0("Maximum number of yp directories exceeded!");
        return;
    }
    do {
        if (node == NULL) break;
        if (xmlIsBlankNode(node)) continue;

        if (xmlStrcmp (node->name, XMLSTR("yp-url")) == 0) {
            if (configuration->yp_url[configuration->num_yp_directories]) 
                xmlFree(configuration->yp_url[configuration->num_yp_directories]);
            configuration->yp_url[configuration->num_yp_directories] = 
                (char *)xmlNodeListGetString(doc, node->xmlChildrenNode, 1);
        } else if (xmlStrcmp (node->name, XMLSTR("yp-url-timeout")) == 0) {
            tmp = (char *)xmlNodeListGetString(doc, node->xmlChildrenNode, 1);
            configuration->yp_url_timeout[configuration->num_yp_directories] = 
                atoi(tmp);
            if (tmp) xmlFree(tmp);
        } else if (xmlStrcmp (node->name, XMLSTR("server")) == 0) {
            _add_server(doc, node->xmlChildrenNode, configuration);
        } else if (xmlStrcmp (node->name, XMLSTR("touch-interval")) == 0) {
            tmp = (char *)xmlNodeListGetString(doc, node->xmlChildrenNode, 1);
            configuration->yp_touch_interval[configuration->num_yp_directories] =
                atoi(tmp);
            if (tmp) xmlFree(tmp);
        }
    } while ((node = node->next));
    if (configuration->yp_url [configuration->num_yp_directories] == NULL)
        return;
    configuration->num_yp_directories++;
}