Move backend implementations to subdirectory

1 files changed, 0 insertions, 813 deletions

diff --git a/osc.c b/osc.c
deleted file mode 100644
index adc91f5..0000000
--- a/osc.c
+++ /dev/null
@@ -1,813 +0,0 @@
-#include <string.h>
-#include <unistd.h>
-#include <ctype.h>
-#include <netdb.h>
-#include <errno.h>
-#include <fcntl.h>
-#include "osc.h"
-
-/*
- * TODO
- * ping method
- */
-
-#define osc_align(a) ((((a) / 4) + (((a) % 4) ? 1 : 0)) * 4)
-#define BACKEND_NAME "osc"
-
-int init(){
-	backend osc = {
-		.name = BACKEND_NAME,
-		.conf = backend_configure,
-		.create = backend_instance,
-		.conf_instance = backend_configure_instance,
-		.channel = backend_channel,
-		.handle = backend_set,
-		.process = backend_handle,
-		.start = backend_start,
-		.shutdown = backend_shutdown
-	};
-
-	//register backend
-	if(mm_backend_register(osc)){
-		fprintf(stderr, "Failed to register OSC backend\n");
-		return 1;
-	}
-	return 0;
-}
-
-static size_t osc_data_length(osc_parameter_type t){
-	switch(t){
-		case int32:
-		case float32:
-			return 4;
-		case int64:
-		case double64:
-			return 8;
-		default:
-			fprintf(stderr, "Invalid OSC format specified %c\n", t);
-			return 0;
-	}
-}
-
-static inline void osc_defaults(osc_parameter_type t, osc_parameter_value* max, osc_parameter_value* min){
-	memset(max, 0, sizeof(osc_parameter_value));
-	memset(min, 0, sizeof(osc_parameter_value));
-	switch(t){
-		case int32:
-			max->i32 = 255;
-			return;
-		case float32:
-			max->f = 1.0;
-			return;
-		case int64:
-			max->i64 = 1024;
-			return;
-		case double64:
-			max->d = 1.0;
-			return;
-		default:
-			fprintf(stderr, "Invalid OSC type, not setting any sane defaults\n");
-			return;
-	}
-}
-
-static inline osc_parameter_value osc_parse(osc_parameter_type t, uint8_t* data){
-	osc_parameter_value v = {0};
-	switch(t){
-		case int32:
-		case float32:
-			v.i32 = be32toh(*((int32_t*) data));
-			break;
-		case int64:
-		case double64:
-			v.i64 = be64toh(*((int64_t*) data));
-			break;
-		default:
-			fprintf(stderr, "Invalid OSC type passed to parsing routine\n");
-	}
-	return v;
-}
-
-static inline int osc_deparse(osc_parameter_type t, osc_parameter_value v, uint8_t* data){
-	uint64_t u64 = 0;
-	uint32_t u32 = 0;
-	switch(t){
-		case int32:
-		case float32:
-			u32 = htobe32(v.i32);
-			memcpy(data, &u32, sizeof(u32));
-			break;
-		case int64:
-		case double64:
-			u64 = htobe64(v.i64);
-			memcpy(data, &u64, sizeof(u64));
-			break;
-		default:
-			fprintf(stderr, "Invalid OSC type passed to parsing routine\n");
-			return 1;
-	}
-	return 0;
-}
-
-static inline osc_parameter_value osc_parse_value_spec(osc_parameter_type t, char* value){
-	osc_parameter_value v = {0};
-	switch(t){
-		case int32:
-			v.i32 = strtol(value, NULL, 0);
-			break;
-		case float32:
-			v.f = strtof(value, NULL);
-			break;
-		case int64:
-			v.i64 = strtoll(value, NULL, 0);
-			break;
-		case double64:
-			v.d = strtod(value, NULL);
-			break;
-		default:
-			fprintf(stderr, "Invalid OSC type passed to value parser\n");
-	}
-	return v;
-}
-
-static inline channel_value osc_parameter_normalise(osc_parameter_type t, osc_parameter_value min, osc_parameter_value max, osc_parameter_value cur){
-	channel_value v = {
-		.raw = {0},
-		.normalised = 0
-	};
-
-	union {
-		uint32_t u32;
-		float f32;
-		uint64_t u64;
-		double d64;
-	} range;
-
-	switch(t){
-		case int32:
-			range.u32 = max.i32 - min.i32;
-			v.raw.u64 = cur.i32 - min.i32;
-			v.normalised = v.raw.u64 / range.u32;
-			break;
-		case float32:
-			range.f32 = max.f - min.f;
-			v.raw.dbl = cur.f - min.f;
-			v.normalised = v.raw.dbl / range.f32;
-			break;
-		case int64:
-			range.u64 = max.i64 - min.i64;
-			v.raw.u64 = cur.i64 - min.i64;
-			v.normalised = v.raw.u64 / range.u64;
-			break;
-		case double64:
-			range.d64 = max.d - min.d;
-			v.raw.dbl = cur.d - min.d;
-			v.normalised = v.raw.dbl / range.d64;
-			break;
-		default:
-			fprintf(stderr, "Invalid OSC type passed to interpolation routine\n");
-	}
-
-	//fix overshoot
-	if(v.normalised > 1.0){
-		v.normalised = 1.0;
-	}
-	else if(v.normalised < 0.0){
-		v.normalised = 0.0;
-	}
-
-	return v;
-}
-
-static inline osc_parameter_value osc_parameter_denormalise(osc_parameter_type t, osc_parameter_value min, osc_parameter_value max, channel_value cur){
-	osc_parameter_value v = {0};
-
-	union {
-		uint32_t u32;
-		float f32;
-		uint64_t u64;
-		double d64;
-	} range;
-
-	switch(t){
-		case int32:
-			range.u32 = max.i32 - min.i32;
-			v.i32 = (range.u32 * cur.normalised) + min.i32;
-			break;
-		case float32:
-			range.f32 = max.f - min.f;
-			v.f = (range.f32 * cur.normalised) + min.f;
-			break;
-		case int64:
-			range.u64 = max.i64 - min.i64;
-			v.i64 = (range.u64 * cur.normalised) + min.i64;
-			break;
-		case double64:
-			range.d64 = max.d - min.d;
-			v.d = (range.d64 * cur.normalised) + min.d;
-			break;
-		default:
-			fprintf(stderr, "Invalid OSC type passed to interpolation routine\n");
-	}
-
-	return v;
-}
-
-static int osc_generate_event(channel* c, osc_channel* info, char* fmt, uint8_t* data, size_t data_len){
-	size_t p, off = 0;
-	if(!c || !info){
-		return 0;
-	}
-
-	osc_parameter_value min, max, cur;
-	channel_value evt;
-
-	if(!fmt || !data || data_len % 4 || !*fmt){
-		fprintf(stderr, "Invalid OSC packet, data length %zu\n", data_len);
-		return 1;
-	}
-
-	//find offset for this parameter
-	for(p = 0; p < info->param_index; p++){
-		off += osc_data_length(fmt[p]);
-	}
-
-	if(info->type != not_set){
-		max = info->max;
-		min = info->min;
-	}
-	else{
-		osc_defaults(fmt[info->param_index], &max, &min);
-	}
-
-	cur = osc_parse(fmt[info->param_index], data + off);
-	evt = osc_parameter_normalise(fmt[info->param_index], min, max, cur);
-
-	return mm_channel_event(c, evt);
-}
-
-static int osc_validate_path(char* path){
-	if(path[0] != '/'){
-		fprintf(stderr, "%s is not a valid OSC path: Missing root /\n", path);
-		return 1;
-	}
-	return 0;
-}
-
-static int osc_separate_hostspec(char* in, char** host, char** port){
-	size_t u;
-
-	if(!in || !host || !port){
-		return 1;
-	}
-
-	for(u = 0; in[u] && !isspace(in[u]); u++){
-	}
-
-	//guess
-	*host = in;
-
-	if(in[u]){
-		in[u] = 0;
-		*port = in + u + 1;
-	}
-	else{
-		//no port given
-		*port = NULL;
-	}
-	return 0;
-}
-
-static int osc_listener(char* host, char* port){
-	int fd = -1, status, yes = 1, flags;
-	struct addrinfo hints = {
-		.ai_family = AF_UNSPEC,
-		.ai_socktype = SOCK_DGRAM,
-		.ai_flags = AI_PASSIVE
-	};
-	struct addrinfo* info;
-	struct addrinfo* addr_it;
-
-	status = getaddrinfo(host, port, &hints, &info);
-	if(status){
-		fprintf(stderr, "Failed to get socket info for %s port %s: %s\n", host, port, gai_strerror(status));
-		return -1;
-	}
-
-	for(addr_it = info; addr_it != NULL; addr_it = addr_it->ai_next){
-		fd = socket(addr_it->ai_family, addr_it->ai_socktype, addr_it->ai_protocol);
-		if(fd < 0){
-			continue;
-		}
-
-		yes = 1;
-		if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(yes)) < 0){
-			fprintf(stderr, "Failed to set SO_REUSEADDR on socket\n");
-		}
-
-		yes = 1;
-		if(setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (void*)&yes, sizeof(yes)) < 0){
-			fprintf(stderr, "Failed to set SO_BROADCAST on socket\n");
-		}
-
-		yes = 0;
-		if(setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, (void*)&yes, sizeof(yes)) < 0){
-			fprintf(stderr, "Failed to unset IP_MULTICAST_LOOP option: %s\n", strerror(errno));
-		}
-
-		status = bind(fd, addr_it->ai_addr, addr_it->ai_addrlen);
-		if(status < 0){
-			close(fd);
-			continue;
-		}
-
-		break;
-	}
-
-	freeaddrinfo(info);
-
-	if(!addr_it){
-		fprintf(stderr, "Failed to create listening socket for %s port %s\n", host, port);
-		return -1;
-	}
-
-	//set nonblocking
-	flags = fcntl(fd, F_GETFL, 0);
-	if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0){
-		fprintf(stderr, "Failed to set OSC descriptor nonblocking\n");
-		return -1;
-	}
-
-	return fd;
-}
-
-static int osc_parse_addr(char* host, char* port, struct sockaddr_storage* addr, socklen_t* len){
-	struct addrinfo* head;
-	struct addrinfo hints = {
-		.ai_family = AF_UNSPEC,
-		.ai_socktype = SOCK_DGRAM
-	};
-
-	int error = getaddrinfo(host, port, &hints, &head);
-	if(error || !head){
-		fprintf(stderr, "Failed to parse address %s port %s: %s\n", host, port, gai_strerror(error));
-		return 1;
-	}
-
-	memcpy(addr, head->ai_addr, head->ai_addrlen);
-	*len = head->ai_addrlen;
-
-	freeaddrinfo(head);
-	return 0;
-}
-
-static int backend_configure(char* option, char* value){
-	fprintf(stderr, "The OSC backend does not take any global configuration\n");
-	return 1;
-}
-
-static int backend_configure_instance(instance* inst, char* option, char* value){
-	osc_instance* data = (osc_instance*) inst->impl;
-	char* host = NULL, *port = NULL, *token = NULL, *format = NULL;
-	size_t u, p;
-
-	if(!strcmp(option, "root")){
-		if(osc_validate_path(value)){
-			fprintf(stderr, "Not a valid OSC root: %s\n", value);
-			return 1;
-		}
-
-		if(data->root){
-			free(data->root);
-		}
-		data->root = strdup(value);
-
-		if(!data->root){
-			fprintf(stderr, "Failed to allocate memory\n");
-			return 1;
-		}
-		return 0;
-	}
-	else if(!strcmp(option, "bind")){
-		if(osc_separate_hostspec(value, &host, &port)){
-			fprintf(stderr, "Invalid bind address for instance %s\n", inst->name);
-			return 1;
-		}
-
-		data->fd = osc_listener(host, port);
-		if(data->fd < 0){
-			fprintf(stderr, "Failed to bind for instance %s\n", inst->name);
-			return 1;
-		}
-		return 0;
-	}
-	else if(!strcmp(option, "dest") || !strcmp(option, "destination")){
-		if(!strncmp(value, "learn", 5)){
-			data->learn = 1;
-
-			//check if a forced port was provided
-			if(value[5] == '@'){
-				data->forced_rport = strtoul(value + 6, NULL, 0);
-			}
-			return 0;
-		}
-
-		if(osc_separate_hostspec(value, &host, &port)){
-			fprintf(stderr, "Invalid destination address for instance %s\n", inst->name);
-			return 1;
-		}
-
-		if(osc_parse_addr(host, port, &data->dest, &data->dest_len)){
-			fprintf(stderr, "Failed to parse destination address for instance %s\n", inst->name);
-			return 1;
-		}
-		return 0;
-	}
-	else if(*option == '/'){
-		//pre-configure channel
-		if(osc_validate_path(option)){
-			fprintf(stderr, "Not a valid OSC path: %s\n", option);
-			return 1;
-		}
-
-		for(u = 0; u < data->channels; u++){
-			if(!strcmp(option, data->channel[u].path)){
-				fprintf(stderr, "OSC channel %s already configured\n", option);
-				return 1;
-			}
-		}
-
-		//tokenize configuration
-		format = strtok(value, " ");
-		if(!format || strlen(format) < 1){
-			fprintf(stderr, "Not a valid format for OSC path %s\n", option);
-			return 1;
-		}
-
-		//check format validity, create subchannels
-		for(p = 0; p < strlen(format); p++){
-			if(!osc_data_length(format[p])){
-				fprintf(stderr, "Invalid format specifier %c for path %s, ignoring\n", format[p], option);
-				continue;
-			}
-
-			//register new sub-channel
-			data->channel = realloc(data->channel, (data->channels + 1) * sizeof(osc_channel));
-			if(!data->channel){
-				fprintf(stderr, "Failed to allocate memory\n");
-				return 1;
-			}
-
-			memset(data->channel + data->channels, 0, sizeof(osc_channel));
-			data->channel[data->channels].params = strlen(format);
-			data->channel[data->channels].param_index = p;
-			data->channel[data->channels].type = format[p];
-			data->channel[data->channels].path = strdup(option);
-
-			if(!data->channel[data->channels].path){
-				fprintf(stderr, "Failed to allocate memory\n");
-				return 1;
-			}
-
-			//parse min/max values
-			token = strtok(NULL, " ");
-			if(!token){
-				fprintf(stderr, "Missing minimum specification for parameter %zu of %s\n", p, option);
-				return 1;
-			}
-			data->channel[data->channels].min = osc_parse_value_spec(format[p], token);
-
-			token = strtok(NULL, " ");
-			if(!token){
-				fprintf(stderr, "Missing maximum specification for parameter %zu of %s\n", p, option);
-				return 1;
-			}
-			data->channel[data->channels].max = osc_parse_value_spec(format[p], token);
-
-			//allocate channel from core
-			if(!mm_channel(inst, data->channels, 1)){
-				fprintf(stderr, "Failed to register core channel\n");
-				return 1;
-			}
-
-			//increase channel count
-			data->channels++;
-		}
-		return 0;
-	}
-
-	fprintf(stderr, "Unknown configuration parameter %s for OSC backend\n", option);
-	return 1;
-}
-
-static instance* backend_instance(){
-	instance* inst = mm_instance();
-	if(!inst){
-		return NULL;
-	}
-
-	osc_instance* data = calloc(1, sizeof(osc_instance));
-	if(!data){
-		fprintf(stderr, "Failed to allocate memory\n");
-		return NULL;
-	}
-
-	data->fd = -1;
-	inst->impl = data;
-	return inst;
-}
-
-static channel* backend_channel(instance* inst, char* spec){
-	size_t u;
-	osc_instance* data = (osc_instance*) inst->impl;
-	size_t param_index = 0;
-
-	//check spec for correctness
-	if(osc_validate_path(spec)){
-		return NULL;
-	}
-
-	//parse parameter offset
-	if(strrchr(spec, ':')){
-		param_index = strtoul(strrchr(spec, ':') + 1, NULL, 10);
-		*(strrchr(spec, ':')) = 0;
-	}
-
-	//find matching channel
-	for(u = 0; u < data->channels; u++){
-		if(!strcmp(spec, data->channel[u].path) && data->channel[u].param_index == param_index){
-			//fprintf(stderr, "Reusing previously created channel %s parameter %zu\n", data->channel[u].path, data->channel[u].param_index);
-			break;
-		}
-	}
-
-	//allocate new channel
-	if(u == data->channels){
-		data->channel = realloc(data->channel, (u + 1) * sizeof(osc_channel));
-		if(!data->channel){
-			fprintf(stderr, "Failed to allocate memory\n");
-			return NULL;
-		}
-
-		memset(data->channel + u, 0, sizeof(osc_channel));
-		data->channel[u].param_index = param_index;
-		data->channel[u].path = strdup(spec);
-
-		if(!data->channel[u].path){
-			fprintf(stderr, "Failed to allocate memory\n");
-			return NULL;
-		}
-		data->channels++;
-	}
-
-	return mm_channel(inst, u, 1);
-}
-
-static int backend_set(instance* inst, size_t num, channel** c, channel_value* v){
-	uint8_t xmit_buf[OSC_XMIT_BUF], *format = NULL;
-	size_t evt = 0, off, members, p;
-	if(!num){
-		return 0;
-	}
-
-	osc_instance* data = (osc_instance*) inst->impl;
-	if(!data->dest_len){
-		fprintf(stderr, "OSC instance %s does not have a destination, output is disabled (%zu channels)\n", inst->name, num);
-		return 0;
-	}
-
-	for(evt = 0; evt < num; evt++){
-		off = c[evt]->ident;
-
-		//sanity check
-		if(off >= data->channels){
-			fprintf(stderr, "OSC channel identifier out of range\n");
-			return 1;
-		}
-
-		//if the format is unknown, don't output
-		if(data->channel[off].type == not_set || data->channel[off].params == 0){
-			fprintf(stderr, "OSC channel %s.%s requires format specification for output\n", inst->name, data->channel[off].path);
-			continue;
-		}
-
-		//update current value
-		data->channel[off].current = osc_parameter_denormalise(data->channel[off].type, data->channel[off].min, data->channel[off].max, v[evt]);
-		//mark channel
-		data->channel[off].mark = 1;
-	}
-
-	//fix destination rport if required
-	if(data->forced_rport){
-		//cheating a bit because both IPv4 and IPv6 have the port at the same offset
-		struct sockaddr_in* sockadd = (struct sockaddr_in*) &(data->dest);
-		sockadd->sin_port = htobe16(data->forced_rport);
-	}
-
-	//find all marked channels
-	for(evt = 0; evt < data->channels; evt++){
-		//zero output buffer
-		memset(xmit_buf, 0, sizeof(xmit_buf));
-		if(data->channel[evt].mark){
-			//determine minimum packet size
-			if(osc_align((data->root ? strlen(data->root) : 0) + strlen(data->channel[evt].path) + 1) + osc_align(data->channel[evt].params + 2)  >= sizeof(xmit_buf)){
-				fprintf(stderr, "Insufficient buffer size for OSC transmitting channel %s.%s\n", inst->name, data->channel[evt].path);
-				return 1;
-			}
-
-			off = 0;
-			//copy osc target path
-			if(data->root){
-				memcpy(xmit_buf, data->root, strlen(data->root));
-				off += strlen(data->root);
-			}
-			memcpy(xmit_buf + off, data->channel[evt].path, strlen(data->channel[evt].path));
-			off += strlen(data->channel[evt].path) + 1;
-			off = osc_align(off);
-
-			//get format string offset, initialize
-			format = xmit_buf + off;
-			off += osc_align(data->channel[evt].params + 2);
-			*format = ',';
-			format++;
-
-			//gather subchannels, unmark
-			members = 0;
-			for(p = 0; p < data->channels && members < data->channel[evt].params; p++){
-				if(!strcmp(data->channel[evt].path, data->channel[p].path)){
-					//unmark channel
-					data->channel[p].mark = 0;
-
-					//sanity check
-					if(data->channel[p].param_index >= data->channel[evt].params){
-						fprintf(stderr, "OSC channel %s.%s has multiple parameter offset definitions\n", inst->name, data->channel[evt].path);
-						return 1;
-					}
-
-					//write format specifier
-					format[data->channel[p].param_index] = data->channel[p].type;
-
-					//write data
-					//FIXME this currently depends on all channels being registered in the correct order, since it just appends data
-					if(off + osc_data_length(data->channel[p].type) >= sizeof(xmit_buf)){
-						fprintf(stderr, "Insufficient buffer size for OSC transmitting channel %s.%s at parameter %zu\n", inst->name, data->channel[evt].path, members);
-						return 1;
-					}
-
-					osc_deparse(data->channel[p].type, data->channel[p].current, xmit_buf + off);
-					off += osc_data_length(data->channel[p].type);
-					members++;
-				}
-			}
-
-			//output packet
-			if(sendto(data->fd, xmit_buf, off, 0, (struct sockaddr*) &(data->dest), data->dest_len) < 0){
-				fprintf(stderr, "Failed to transmit OSC packet: %s\n", strerror(errno));
-			}
-		}
-	}
-	return 0;
-}
-
-static int backend_handle(size_t num, managed_fd* fds){
-	size_t fd;
-	char recv_buf[OSC_RECV_BUF];
-	instance* inst = NULL;
-	osc_instance* data = NULL;
-	ssize_t bytes_read = 0;
-	size_t c;
-	char* osc_fmt = NULL;
-	char* osc_local = NULL;
-	uint8_t* osc_data = NULL;
-
-	for(fd = 0; fd < num; fd++){
-		inst = (instance*) fds[fd].impl;
-		if(!inst){
-			fprintf(stderr, "OSC backend signaled for unknown fd\n");
-			continue;
-		}
-
-		data = (osc_instance*) inst->impl;
-
-		do{
-			if(data->learn){
-				data->dest_len = sizeof(data->dest);
-				bytes_read = recvfrom(fds[fd].fd, recv_buf, sizeof(recv_buf), 0, (struct sockaddr*) &(data->dest), &(data->dest_len));
-			}
-			else{
-				bytes_read = recv(fds[fd].fd, recv_buf, sizeof(recv_buf), 0);
-			}
-			if(data->root && strncmp(recv_buf, data->root, strlen(data->root))){
-				//ignore packet for different root
-				continue;
-			}
-			osc_local = recv_buf + (data->root ? strlen(data->root) : 0);
-
-			if(bytes_read < 0){
-				break;
-			}
-
-			osc_fmt = recv_buf + osc_align(strlen(recv_buf) + 1);
-			if(*osc_fmt != ','){
-				//invalid format string
-				fprintf(stderr, "Invalid OSC format string in packet\n");
-				continue;
-			}
-			osc_fmt++;
-
-			osc_data = (uint8_t*) osc_fmt + (osc_align(strlen(osc_fmt) + 2) - 1);
-			//FIXME check supplied data length
-
-			for(c = 0; c < data->channels; c++){
-				//FIXME implement proper OSC path match
-				//prefix match
-				if(!strcmp(osc_local, data->channel[c].path)){
-					if(strlen(osc_fmt) > data->channel[c].param_index){
-						//fprintf(stderr, "Taking parameter %zu of %s (%s), %zd bytes, data offset %zu\n", data->channel[c].param_index, recv_buf, osc_fmt, bytes_read, (osc_data - (uint8_t*)recv_buf));
-						if(osc_generate_event(mm_channel(inst, c, 0), data->channel + c, osc_fmt, osc_data, bytes_read - (osc_data - (uint8_t*) recv_buf))){
-							fprintf(stderr, "Failed to generate OSC channel event\n");
-						}
-					}
-				}
-			}
-		} while(bytes_read > 0);
-
-		if(bytes_read < 0 && errno != EAGAIN){
-			fprintf(stderr, "OSC failed to receive data for instance %s: %s\n", inst->name, strerror(errno));
-		}
-
-		if(bytes_read == 0){
-			fprintf(stderr, "OSC descriptor for instance %s closed\n", inst->name);
-			return 1;
-		}
-	}
-
-	return 0;
-}
-
-static int backend_start(){
-	size_t n, u, fds = 0;
-	instance** inst = NULL;
-	osc_instance* data = NULL;
-
-	//fetch all instances
-	if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
-		fprintf(stderr, "Failed to fetch instance list\n");
-		return 1;
-	}
-
-	if(!n){
-		free(inst);
-		return 0;
-	}
-
-	//update instance identifiers
-	for(u = 0; u < n; u++){
-		data = (osc_instance*) inst[u]->impl;
-
-		if(data->fd >= 0){
-			inst[u]->ident = data->fd;
-			if(mm_manage_fd(data->fd, BACKEND_NAME, 1, inst[u])){
-				fprintf(stderr, "Failed to register OSC descriptor for instance %s\n", inst[u]->name);
-				free(inst);
-				return 1;
-			}
-			fds++;
-		}
-		else{
-			inst[u]->ident = -1;
-		}
-	}
-
-	fprintf(stderr, "OSC backend registered %zu descriptors to core\n", fds);
-
-	free(inst);
-	return 0;
-}
-
-static int backend_shutdown(){
-	size_t n, u, c;
-	instance** inst = NULL;
-	osc_instance* data = NULL;
-
-	if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
-		fprintf(stderr, "Failed to fetch instance list\n");
-		return 1;
-	}
-
-	for(u = 0; u < n; u++){
-		data = (osc_instance*) inst[u]->impl;
-		for(c = 0; c < data->channels; c++){
-			free(data->channel[c].path);
-		}
-		free(data->channel);
-		free(data->root);
-		close(data->fd);
-		data->fd = -1;
-		data->channels = 0;
-		free(inst[u]->impl);
-	}
-
-	free(inst);
-	return 0;
-}