自学教程：C++ unix_ipc_sendmsg函数代码示例

static void gateway_resume_complete(struct audio_device *dev, GError *err, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_start_stream_rsp *rsp = (void *) buf;	struct bt_new_stream_ind *ind = (void *) buf;	if (err) {		unix_ipc_error(client, BT_START_STREAM, err->code);		return;	}	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_START_STREAM;	rsp->h.length = sizeof(*rsp);	unix_ipc_sendmsg(client, &rsp->h);	memset(buf, 0, sizeof(buf));	ind->h.type = BT_INDICATION;	ind->h.name = BT_NEW_STREAM;	ind->h.length = sizeof(*ind);	unix_ipc_sendmsg(client, &ind->h);	client->data_fd = gateway_get_sco_fd(dev);	if (unix_sendmsg_fd(client->sock, client->data_fd) < 0) {		error("unix_sendmsg_fd: %s(%d)", strerror(errno), errno);		unix_ipc_error(client, BT_START_STREAM, EIO);	}	client->req_id = 0;}

static void a2dp_resume_complete(struct avdtp *session,				struct avdtp_error *err, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_start_stream_rsp *rsp = (void *) buf;	struct bt_new_stream_ind *ind = (void *) buf;	struct a2dp_data *a2dp = &client->d.a2dp;	if (err)		goto failed;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_START_STREAM;	rsp->h.length = sizeof(*rsp);	unix_ipc_sendmsg(client, &rsp->h);	memset(buf, 0, sizeof(buf));	ind->h.type = BT_RESPONSE;	ind->h.name = BT_NEW_STREAM;	rsp->h.length = sizeof(*ind);	unix_ipc_sendmsg(client, &ind->h);	if (unix_sendmsg_fd(client->sock, client->data_fd) < 0) {		error("unix_sendmsg_fd: %s(%d)", strerror(errno), errno);		goto failed;	}	return;failed:	error("resume failed");	unix_ipc_error(client, BT_START_STREAM, EIO);	if (client->cb_id > 0) {		avdtp_stream_remove_cb(a2dp->session, a2dp->stream,					client->cb_id);		client->cb_id = 0;	}	if (a2dp->sep) {		a2dp_sep_unlock(a2dp->sep, a2dp->session);		a2dp->sep = NULL;	}	avdtp_unref(a2dp->session);	a2dp->session = NULL;	a2dp->stream = NULL;}

static void a2dp_suspend_complete(struct avdtp *session,				struct avdtp_error *err, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_stop_stream_rsp *rsp = (void *) buf;	struct a2dp_data *a2dp = &client->d.a2dp;	if (err)		goto failed;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_STOP_STREAM;	rsp->h.length = sizeof(*rsp);	unix_ipc_sendmsg(client, &rsp->h);	return;failed:	error("suspend failed");	unix_ipc_error(client, BT_STOP_STREAM, EIO);	if (a2dp->sep) {		a2dp_sep_unlock(a2dp->sep, a2dp->session);		a2dp->sep = NULL;	}	avdtp_unref(a2dp->session);	a2dp->session = NULL;	a2dp->stream = NULL;}

static void a2dp_config_complete(struct avdtp *session, struct a2dp_sep *sep,					struct avdtp_stream *stream,					struct avdtp_error *err,					void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_set_configuration_rsp *rsp = (void *) buf;	struct a2dp_data *a2dp = &client->d.a2dp;	uint16_t imtu, omtu;	GSList *caps;	client->req_id = 0;	if (err)		goto failed;	memset(buf, 0, sizeof(buf));	if (!stream)		goto failed;	if (client->cb_id > 0)		avdtp_stream_remove_cb(a2dp->session, a2dp->stream,								client->cb_id);	a2dp->sep = sep;	a2dp->stream = stream;	if (!avdtp_stream_get_transport(stream, &client->data_fd, &imtu, &omtu,					&caps)) {		error("Unable to get stream transport");		goto failed;	}	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_SET_CONFIGURATION;	rsp->h.length = sizeof(*rsp);	/* FIXME: Use imtu when fd_opt is CFG_FD_OPT_READ */	rsp->link_mtu = omtu;	unix_ipc_sendmsg(client, &rsp->h);	client->cb_id = avdtp_stream_add_cb(session, stream,						stream_state_changed, client);	return;failed:	error("config failed");	unix_ipc_error(client, BT_SET_CONFIGURATION, EIO);	avdtp_unref(a2dp->session);	a2dp->session = NULL;	a2dp->stream = NULL;	a2dp->sep = NULL;}

static void gateway_setup_complete(struct audio_device *dev, GError *err, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_set_configuration_rsp *rsp = (void *) buf;	if (err) {		unix_ipc_error(client, BT_SET_CONFIGURATION, err->code);		return;	}	client->req_id = 0;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_SET_CONFIGURATION;	rsp->h.length = sizeof(*rsp);	rsp->link_mtu = 48;	client->data_fd = gateway_get_sco_fd(dev);	unix_ipc_sendmsg(client, &rsp->h);}

static void headset_discovery_complete(struct audio_device *dev, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_get_capabilities_rsp *rsp = (void *) buf;	uint8_t length;	client->req_id = 0;	if (!dev)		goto failed;	memset(buf, 0, sizeof(buf));	length = headset_generate_capability(dev, (void *) rsp->data);	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_GET_CAPABILITIES;	rsp->h.length = sizeof(*rsp) + length;	ba2str(&dev->src, rsp->source);	ba2str(&dev->dst, rsp->destination);	strncpy(rsp->object, dev->path, sizeof(rsp->object));	unix_ipc_sendmsg(client, &rsp->h);	return;failed:	error("discovery failed");	unix_ipc_error(client, BT_SET_CONFIGURATION, EIO);}

static void headset_setup_complete(struct audio_device *dev, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_set_configuration_rsp *rsp = (void *) buf;	client->req_id = 0;	if (!dev)		goto failed;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_SET_CONFIGURATION;	rsp->h.length = sizeof(*rsp);	rsp->link_mtu = 48;	client->data_fd = headset_get_sco_fd(dev);	unix_ipc_sendmsg(client, &rsp->h);	return;failed:	error("config failed");	unix_ipc_error(client, BT_SET_CONFIGURATION, EIO);}

static void headset_resume_complete(struct audio_device *dev, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_start_stream_rsp *rsp = (void *) buf;	struct bt_new_stream_ind *ind = (void *) buf;	client->req_id = 0;	if (!dev)		goto failed;	client->data_fd = headset_get_sco_fd(dev);	if (client->data_fd < 0) {		error("Unable to get a SCO fd");		goto failed;	}	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_START_STREAM;	rsp->h.length = sizeof(*rsp);	unix_ipc_sendmsg(client, &rsp->h);	memset(buf, 0, sizeof(buf));	ind->h.type = BT_INDICATION;	ind->h.name = BT_NEW_STREAM;	ind->h.length = sizeof(*ind);	unix_ipc_sendmsg(client, &ind->h);	if (unix_sendmsg_fd(client->sock, client->data_fd) < 0) {		error("unix_sendmsg_fd: %s(%d)", strerror(errno), errno);		goto failed;	}	return;failed:	error("headset_resume_complete: resume failed");	unix_ipc_error(client, BT_START_STREAM, EIO);}

static void handle_control_req(struct unix_client *client,					struct bt_control_req *req){	/* FIXME: really implement that */	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_set_configuration_rsp *rsp = (void *) buf;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_CONTROL;	rsp->h.length = sizeof(*rsp);	unix_ipc_sendmsg(client, &rsp->h);}

static void handle_delay_report_req(struct unix_client *client,					struct bt_delay_report_req *req){	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_set_configuration_rsp *rsp = (void *) buf;	struct a2dp_data *a2dp;	int err;	if (!client->dev) {		err = -ENODEV;		goto failed;	}	switch (client->type) {	case TYPE_HEADSET:        case TYPE_GATEWAY:		err = -EINVAL;		goto failed;	case TYPE_SOURCE:	case TYPE_SINK:		a2dp = &client->d.a2dp;		if (a2dp->session && a2dp->stream) {			err = avdtp_delay_report(a2dp->session, a2dp->stream,								req->delay);			if (err < 0)				goto failed;		} else {			err = -EINVAL;			goto failed;		}		break;	default:		error("No known services for device");		err = -EINVAL;		goto failed;	}	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_DELAY_REPORT;	rsp->h.length = sizeof(*rsp);	unix_ipc_sendmsg(client, &rsp->h);	return;failed:	unix_ipc_error(client, BT_DELAY_REPORT, -err);}

static void close_complete(struct audio_device *dev, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_close_rsp *rsp = (void *) buf;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_CLOSE;	rsp->h.length = sizeof(*rsp);	unix_ipc_sendmsg(client, &rsp->h);	return;}

static void unix_ipc_error(struct unix_client *client, uint8_t name, int err){	char buf[BT_SUGGESTED_BUFFER_SIZE];	bt_audio_error_t *rsp = (void *) buf;	if (!g_slist_find(clients, client))		return;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_ERROR;	rsp->h.name = name;	rsp->h.length = sizeof(*rsp);	rsp->posix_errno = err;	unix_ipc_sendmsg(client, &rsp->h);}

static void open_complete(struct audio_device *dev, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_open_rsp *rsp = (void *) buf;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_OPEN;	rsp->h.length = sizeof(*rsp);	ba2str(&dev->src, rsp->source);	ba2str(&dev->dst, rsp->destination);	strncpy(rsp->object, dev->path, sizeof(rsp->object));	unix_ipc_sendmsg(client, &rsp->h);}

static void headset_suspend_complete(struct audio_device *dev, void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_stop_stream_rsp *rsp = (void *) buf;	if (!dev)		goto failed;	memset(buf, 0, sizeof(buf));	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_STOP_STREAM;	rsp->h.length = sizeof(*rsp);	unix_ipc_sendmsg(client, &rsp->h);	return;failed:	error("suspend failed");	unix_ipc_error(client, BT_STOP_STREAM, EIO);}

void unix_delay_report(struct audio_device *dev, uint8_t seid, uint16_t delay){	GSList *l;	struct bt_delay_report_ind ind;	DBG("unix_delay_report(%p): %u.%ums", dev, delay / 10, delay % 10);	memset(&ind, 0, sizeof(ind));	ind.h.type = BT_INDICATION;	ind.h.name = BT_DELAY_REPORT;	ind.h.length = sizeof(ind);	ind.delay = delay;	for (l = clients; l != NULL; l = g_slist_next(l)) {		struct unix_client *client = l->data;		if (client->dev != dev || client->seid != seid)			continue;		unix_ipc_sendmsg(client, (void *) &ind);	}}

static void a2dp_discovery_complete(struct avdtp *session, GSList *seps,					struct avdtp_error *err,					void *user_data){	struct unix_client *client = user_data;	char buf[BT_SUGGESTED_BUFFER_SIZE];	struct bt_get_capabilities_rsp *rsp = (void *) buf;	struct a2dp_data *a2dp = &client->d.a2dp;	GSList *l;	if (!g_slist_find(clients, client)) {		DBG("Client disconnected during discovery");		return;	}	if (err)		goto failed;	memset(buf, 0, sizeof(buf));	client->req_id = 0;	rsp->h.type = BT_RESPONSE;	rsp->h.name = BT_GET_CAPABILITIES;	rsp->h.length = sizeof(*rsp);	ba2str(&client->dev->src, rsp->source);	ba2str(&client->dev->dst, rsp->destination);	strncpy(rsp->object, client->dev->path, sizeof(rsp->object));	for (l = seps; l; l = g_slist_next(l)) {		struct avdtp_remote_sep *rsep = l->data;		struct a2dp_sep *sep;		struct avdtp_service_capability *cap;		struct avdtp_stream *stream;		uint8_t type, seid, configured = 0, lock = 0;		GSList *cl;		type = avdtp_get_type(rsep);		if (type != AVDTP_SEP_TYPE_SINK &&						type != AVDTP_SEP_TYPE_SOURCE)			continue;		cap = avdtp_get_codec(rsep);		if (cap->category != AVDTP_MEDIA_CODEC)			continue;		seid = avdtp_get_seid(rsep);		if (client->seid != 0 && client->seid != seid)			continue;		stream = avdtp_get_stream(rsep);		if (stream) {			configured = 1;			if (client->seid == seid)				cap = avdtp_stream_get_codec(stream);		}		for (cl = clients; cl; cl = cl->next) {			struct unix_client *c = cl->data;			struct a2dp_data *ca2dp = &c->d.a2dp;			if (ca2dp->session == session && c->seid == seid) {				lock = c->lock;				break;			}		}		sep = a2dp_get_sep(session, stream);		if (sep && a2dp_sep_get_lock(sep))			lock = BT_WRITE_LOCK;		a2dp_append_codec(rsp, cap, seid, type, configured, lock);	}	unix_ipc_sendmsg(client, &rsp->h);	return;failed:	error("discovery failed");	unix_ipc_error(client, BT_GET_CAPABILITIES, EIO);	if (a2dp->sep) {		a2dp_sep_unlock(a2dp->sep, a2dp->session);		a2dp->sep = NULL;	}	avdtp_unref(a2dp->session);	a2dp->session = NULL;	a2dp->stream = NULL;}