From: Mart Lubbers <mart@martlubbers.net>
Date: Wed, 14 Dec 2016 18:05:08 +0000 (+0100)
Subject: split up in header files and modules and start with sds storage support
X-Git-Url: https://git.martlubbers.net/?a=commitdiff_plain;h=fa71b6dc45c53e87d9045eb7cdf3cd4328ad0e7d;p=mTask.git

split up in header files and modules and start with sds storage support
---

diff --git a/int/.gitignore b/int/.gitignore
index b5287f3..87e54c2 100644
--- a/int/.gitignore
+++ b/int/.gitignore
@@ -1 +1,2 @@
-int
+main
+*.o
diff --git a/int/Makefile b/int/Makefile
index f6e3402..2a16a1e 100644
--- a/int/Makefile
+++ b/int/Makefile
@@ -1,6 +1,15 @@
 CFLAGS:=-g -Wall -Wextra -Werror
-all: mTaskSymbols.h int
+PROG:=main
+OBJS:=interpret.o sds.o task.o
+
+all: mTaskSymbols.h $(PROG)
+
+$(PROG): $(PROG).c $(OBJS) misc.h
+	$(LINK.c) $(LDLIBS) $^ $(OUTPUT_OPTION)
 
 mTaskSymbols.h:
 	CLMFLAGS=-nr make -BC .. mTaskInterpret
 	../mTaskInterpret > $@
+
+clean:
+	$(RM) $(OBJS) $(PROG)
diff --git a/int/int.c b/int/int.c
deleted file mode 100644
index c89a6a8..0000000
--- a/int/int.c
+++ /dev/null
@@ -1,345 +0,0 @@
-#include <netdb.h>
-#include <netinet/in.h>
-#include <signal.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <sys/time.h>
-#include <unistd.h>
-
-#include "mTaskSymbols.h"
-
-#define MAXTASKS 5
-#define MAXTASKSIZE 1024
-#define MAXSDS 50
-#define STACKSIZE 1024
-
-#define MSG_TASK 't'
-#define MSG_DELTASK 'd'
-#define MSG_SDS 's'
-
-#define DEBUG
-
-#ifdef DEBUG
-#define debug(s, ...) printf(s, ##__VA_ARGS__);
-#define trace(op, ...) printf("pc: %d, sp: %d, op: " op, pc, sp, ##__VA_ARGS__);
-#else
-#define debug(s, ...) ;
-#define trace(pc, sp, op) ;
-#endif
-
-#define pdie(s) {perror(s); exit(1);}
-#define die(s, ...) {fprintf(stderr, s, ##__VA_ARGS__); exit(1);}
-
-struct task {
-	uint8_t bc[MAXTASKSIZE];
-	uint16_t tlen;
-	uint16_t interval;
-	long lastrun;
-	bool used;
-};
-
-struct timeval tv1;
-struct task tasks[MAXTASKS] = {0};
-int sock_fd = -1;
-int fd = -1;
-int port = 8123;
-
-void killHandler(int i)
-{
-	printf("%s caught, Bye...\n", strsignal(i));
-	exit(1);
-}
-
-bool input_available(int fd){
-	struct timeval tv;
-	fd_set fds;
-	tv.tv_sec = 0;
-	tv.tv_usec = 0;
-	FD_ZERO(&fds);
-	FD_SET(fd, &fds);
-	if (select(fd+1, &fds, NULL, NULL, &tv) == -1)
-		pdie("select");
-	return FD_ISSET(fd, &fds);
-}
-
-long millis() {
-	if (gettimeofday(&tv1, NULL) == -1)
-		pdie("gettimeofday");
-	return tv1.tv_sec*1000 + tv1.tv_usec/1000;
-}
-
-void read_message(int fd_in, int fd_out)
-{
-	//Find next task
-	uint8_t c, ct;
-
-	for(ct = 0; ct<MAXTASKS; ct++)
-		if(!tasks[ct].used)
-			break;
-	if(ct == MAXTASKS)
-		die("Trying to add too much tasks...\n");
-
-	debug("Receiving input for task %d\n", ct);
-	read(fd_in, &c, 1);
-	switch(c){
-	case MSG_SDS:
-		debug("Receiving an sds\n");
-		break;
-	case MSG_DELTASK:
-		debug("Receiving a delete task request\n");
-		//Read task number and set unused
-		read(fd_in, &c, 1);
-		tasks[ct].used = false;
-		break;
-	case MSG_TASK:
-		debug("Receiving a task\n");
-		bzero(&tasks[ct], sizeof(struct task));
-		//Read interval
-		read(fd_in, &c, 1);
-		tasks[ct].interval = 256*c;
-		read(fd_in, &c, 1);
-		tasks[ct].interval += c;
-		//Read tasklength
-		read(fd_in, &c, 1);
-		tasks[ct].tlen = 256*c;
-		read(fd_in, &c, 1);
-		tasks[ct].tlen += c;
-		if(tasks[ct].tlen > MAXTASKSIZE)
-			die("Task is too long: %d\n", tasks[ct].tlen);
-		//Read task bytecode
-		for(int i = 0; i<tasks[ct].tlen; i++){
-			debug("Read %d\n", i);
-			read(fd_in, tasks[ct].bc+i, 1);
-			debug("t[][%i]: %d\n", i,
-				tasks[ct].bc[i]);
-		}
-		//Return the task number for later removal
-		write(fd_out, (void *)&ct, 1);
-		debug("Received a task of length %d\n", tasks[ct].tlen);
-		tasks[ct].used = true;
-		break;
-	default:
-		debug("Unknown message: %X?\n", c);
-	}
-}
-
-void run_task(int tasknum)
-{
-	uint8_t *program = tasks[tasknum].bc;
-	int plen = tasks[tasknum].tlen;
-	int pc = 0;
-	int sp = 0;
-	char stack[STACKSIZE] = {0};
-	printf("Running task: %d\nWith length: %d\n", tasknum, plen);
-	while(pc != plen){
-		printf("program: %x\n", program[pc]);
-		switch(program[pc++]){
-		case BCNOP: trace("nop\n");
-			break;
-		case BCPUSH: trace("push %d\n", program[pc]);
-			stack[sp++] = program[pc++];
-			break;
-		case BCPOP: trace("pop\n");
-			sp--;
-			break;
-		case BCSDSSTORE: trace("sds store\n");
-			break;
-		case BCSDSFETCH: trace("sds fetch\n");
-			break;
-		case BCSDSPUBLISH: trace("sds publish\n");
-			break;
-		case BCNOT: trace("not\n");
-			stack[sp] = stack[sp] > 0 ? 0 : 1;
-			break;
-		case BCADD: trace("add\n");
-			stack[sp-1] = stack[sp] + stack[sp-1];
-			sp -= 1;
-			break;
-		case BCSUB: trace("sub\n");
-			stack[sp-1] = stack[sp] - stack[sp-1];
-			sp -= 1;
-			break;
-		case BCMUL: trace("mul\n");
-			stack[sp-1] = stack[sp] * stack[sp-1];
-			sp -= 1;
-			break;
-		case BCDIV: trace("div\n");
-			stack[sp-1] = stack[sp] / stack[sp-1];
-			sp -= 1;
-			break;
-		case BCAND: trace("and\n");
-			stack[sp-1] = stack[sp] && stack[sp-1];
-			sp -= 1;
-			break;
-		case BCOR: trace("or\n");
-			stack[sp-1] = stack[sp] || stack[sp-1];
-			sp -= 1;
-			break;
-		case BCEQ: trace("eq\n");
-			stack[sp-1] = stack[sp] == stack[sp-1];
-			sp -= 1;
-			break;
-		case BCNEQ: trace("neq\n");
-			stack[sp-1] = stack[sp] != stack[sp-1];
-			sp -= 1;
-			break;
-		case BCLES: trace("les\n");
-			stack[sp-1] = stack[sp] < stack[sp-1];
-			sp -= 1;
-			break;
-		case BCGRE: trace("gre\n");
-			stack[sp-1] = stack[sp] > stack[sp-1];
-			sp -= 1;
-			break;
-		case BCLEQ: trace("leq\n");
-			stack[sp-1] = stack[sp] <= stack[sp-1];
-			sp -= 1;
-			break;
-		case BCGEQ: trace("geq\n");
-			stack[sp-1] = stack[sp] >= stack[sp-1];
-			sp -= 1;
-			break;
-		case BCJMP: trace("jmp to %d\n", program[pc]);
-			pc = pc + program[pc];
-			break;
-		case BCJMPT: trace("jmpt to %d\n", program[pc]);
-			pc += stack[sp] ? program[pc] : 1;
-			break;
-		case BCJMPF: trace("jmpf to %d\n", program[pc]);
-			pc += stack[sp] ? 1 : program[pc];
-			break;
-		case BCSERIALAVAIL: trace("SerialAvailable()\n");
-			break;
-		case BCSERIALPRINT: trace("SerialPrint()\n");
-			break;
-		case BCSERIALPRINTLN: trace("SerialPrintln()\n");
-			break;
-		case BCSERIALREAD: trace("SerialRead()\n");
-			break;
-		case BCSERIALPARSEINT: trace("SerialParseInt()\n");
-			break;
-		case BCANALOGREAD: trace("AnalogRead(%d)\n", program[pc]);
-			pc++;
-			break;
-		case BCANALOGWRITE: trace("AnalogWrite(%d)\n", program[pc]);
-			pc++;
-			break;
-		case BCDIGITALREAD: trace("DigitalRead(%d)\n", program[pc]);
-			pc++;
-			break;
-		case BCDIGITALWRITE: trace("DigitalWrite(%d)\n", program[pc]);
-			pc++;
-			break;
-		default:
-			die("Unrecognized command: %d\n", program[--pc]);
-		}
-	}
-	debug("Task %d terminated\n", tasknum);
-}
-
-void open_filedescriptors()
-{
-	struct sockaddr_in sa;
-
-	bzero((char *) &sa, sizeof(sa));
-	sa.sin_family = AF_INET;
-	sa.sin_addr.s_addr = INADDR_ANY;
-	sa.sin_port = htons(port);
-
-	if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
-		pdie("socket");
-	if(bind(sock_fd, (struct sockaddr*)&sa, sizeof(sa)) == -1)
-		pdie("bind\n");
-	if(listen(sock_fd, 10) == -1)
-		pdie("bind\n");
-
-	printf("Listening on %d\n", port);
-	fflush(stdout);
-	if((fd = accept(sock_fd, (struct sockaddr*)NULL, NULL)) == -1)
-		pdie("accept");
-}
-
-void usage(FILE *o, char *arg0){
-	fprintf(o,
-		"Usage: %s [opts]\n"
-		"\n"
-		"Options\n"
-		"-p PORT  Custom port number, default: 8123\n"
-		, arg0);
-}
-
-int main(int argc, char *argv[])
-{
-	int ct;
-
-	//Register signal handler
-	if(signal(SIGINT, killHandler) == SIG_ERR){
-		die("Couldn't register signal handler...\n");
-	}
-	if(signal(SIGTERM, killHandler) == SIG_ERR){
-		die("Couldn't register signal handler...\n");
-	}
-
-	//Command line arguments
-	int opt;
-	while((opt = getopt(argc, argv, "hp:")) != -1){
-		switch(opt){
-			case 'p':
-				port = atoi(optarg);
-				if(port < 1)
-					die("Port numbers are > 1\n");
-				break;
-			case 'h':
-				usage(stdout, argv[0]);
-				exit(EXIT_SUCCESS);
-			default:
-				usage(stderr, argv[0]);
-				exit(EXIT_FAILURE);
-		}
-
-	}
-
-	open_filedescriptors();
-
-	long cyclestart;
-	while(true){
-		//Check for new tasks
-		if(input_available(fd))
-			read_message(fd, fd);
-		//Run tasks
-		cyclestart = millis();
-		for(ct = 0; ct<MAXTASKS; ct++){
-			//See whether the task is even in use
-			if(!tasks[ct].used){
-				debug("Task %d not implemented\n", ct);
-				continue;
-			}
-			//See whether the task interval has passed
-			if(cyclestart-tasks[ct].lastrun < tasks[ct].interval){
-				debug("Task %d not scheduled\n", ct);
-				continue;
-			}
-#ifdef DEBUG
-			printf("Current task to run: %d\n", ct);
-			printf("Enter to continue, s to step\n");
-			switch(getchar()){
-			case 'd':
-				die("Killed\n");
-			case 's':
-				printf("step\n");
-				break;
-			default:
-				break;
-			}
-#endif
-			run_task(ct);
-		}
-		usleep(10);
-	}
-	return 0;
-}
diff --git a/int/interpret.c b/int/interpret.c
new file mode 100644
index 0000000..f44c7bf
--- /dev/null
+++ b/int/interpret.c
@@ -0,0 +1,121 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mTaskSymbols.h"
+#include "interpret.h"
+#include "misc.h"
+#include "task.h"
+
+void run_task(struct task *t)
+{
+	uint8_t *program = t->bc;
+	int plen = t->tlen;
+	int pc = 0;
+	int sp = 0;
+	char stack[STACKSIZE] = {0};
+	printf("Running task with length: %d\n", plen);
+	while(pc != plen){
+		printf("program: %x\n", program[pc]);
+		switch(program[pc++]){
+		case BCNOP: trace("nop\n");
+			break;
+		case BCPUSH: trace("push %d\n", program[pc]);
+			stack[sp++] = program[pc++];
+			break;
+		case BCPOP: trace("pop\n");
+			sp--;
+			break;
+		case BCSDSSTORE: trace("sds store\n");
+			break;
+		case BCSDSFETCH: trace("sds fetch\n");
+			break;
+		case BCSDSPUBLISH: trace("sds publish\n");
+			break;
+		case BCNOT: trace("not\n");
+			stack[sp] = stack[sp] > 0 ? 0 : 1;
+			break;
+		case BCADD: trace("add\n");
+			stack[sp-1] = stack[sp] + stack[sp-1];
+			sp -= 1;
+			break;
+		case BCSUB: trace("sub\n");
+			stack[sp-1] = stack[sp] - stack[sp-1];
+			sp -= 1;
+			break;
+		case BCMUL: trace("mul\n");
+			stack[sp-1] = stack[sp] * stack[sp-1];
+			sp -= 1;
+			break;
+		case BCDIV: trace("div\n");
+			stack[sp-1] = stack[sp] / stack[sp-1];
+			sp -= 1;
+			break;
+		case BCAND: trace("and\n");
+			stack[sp-1] = stack[sp] && stack[sp-1];
+			sp -= 1;
+			break;
+		case BCOR: trace("or\n");
+			stack[sp-1] = stack[sp] || stack[sp-1];
+			sp -= 1;
+			break;
+		case BCEQ: trace("eq\n");
+			stack[sp-1] = stack[sp] == stack[sp-1];
+			sp -= 1;
+			break;
+		case BCNEQ: trace("neq\n");
+			stack[sp-1] = stack[sp] != stack[sp-1];
+			sp -= 1;
+			break;
+		case BCLES: trace("les\n");
+			stack[sp-1] = stack[sp] < stack[sp-1];
+			sp -= 1;
+			break;
+		case BCGRE: trace("gre\n");
+			stack[sp-1] = stack[sp] > stack[sp-1];
+			sp -= 1;
+			break;
+		case BCLEQ: trace("leq\n");
+			stack[sp-1] = stack[sp] <= stack[sp-1];
+			sp -= 1;
+			break;
+		case BCGEQ: trace("geq\n");
+			stack[sp-1] = stack[sp] >= stack[sp-1];
+			sp -= 1;
+			break;
+		case BCJMP: trace("jmp to %d\n", program[pc]);
+			pc = pc + program[pc];
+			break;
+		case BCJMPT: trace("jmpt to %d\n", program[pc]);
+			pc += stack[sp] ? program[pc] : 1;
+			break;
+		case BCJMPF: trace("jmpf to %d\n", program[pc]);
+			pc += stack[sp] ? 1 : program[pc];
+			break;
+		case BCSERIALAVAIL: trace("SerialAvailable()\n");
+			break;
+		case BCSERIALPRINT: trace("SerialPrint()\n");
+			break;
+		case BCSERIALPRINTLN: trace("SerialPrintln()\n");
+			break;
+		case BCSERIALREAD: trace("SerialRead()\n");
+			break;
+		case BCSERIALPARSEINT: trace("SerialParseInt()\n");
+			break;
+		case BCANALOGREAD: trace("AnalogRead(%d)\n", program[pc]);
+			pc++;
+			break;
+		case BCANALOGWRITE: trace("AnalogWrite(%d)\n", program[pc]);
+			pc++;
+			break;
+		case BCDIGITALREAD: trace("DigitalRead(%d)\n", program[pc]);
+			pc++;
+			break;
+		case BCDIGITALWRITE: trace("DigitalWrite(%d)\n", program[pc]);
+			pc++;
+			break;
+		default:
+			die("Unrecognized command: %d\n", program[--pc]);
+		}
+	}
+	debug("Task terminated\n");
+}
diff --git a/int/interpret.h b/int/interpret.h
new file mode 100644
index 0000000..d2effe7
--- /dev/null
+++ b/int/interpret.h
@@ -0,0 +1,13 @@
+#ifndef INTEPRET_H
+#define INTEPRET_H
+
+#define STACKSIZE 1024
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "task.h"
+
+void run_task(struct task *task);
+
+#endif
diff --git a/int/main.c b/int/main.c
new file mode 100644
index 0000000..78f44bb
--- /dev/null
+++ b/int/main.c
@@ -0,0 +1,179 @@
+#include <netdb.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+#include "interpret.h"
+#include "mTaskSymbols.h"
+#include "sds.h"
+#include "task.h"
+#include "misc.h"
+
+#define MAXSDS 50
+
+#define MSG_GET_TASK 't'
+#define MSG_DEL_TASK 'd'
+#define MSG_SDS_SPEC 's'
+#define MSG_SDS_UPD 'u'
+
+struct timeval tv1;
+int sock_fd = -1;
+int fd = -1;
+int port = 8123;
+
+void killHandler(int i)
+{
+	printf("%s caught, Bye...\n", strsignal(i));
+	exit(1);
+}
+
+bool input_available(int fd){
+	struct timeval tv;
+	fd_set fds;
+	tv.tv_sec = 0;
+	tv.tv_usec = 0;
+	FD_ZERO(&fds);
+	FD_SET(fd, &fds);
+	if (select(fd+1, &fds, NULL, NULL, &tv) == -1)
+		pdie("select");
+	return FD_ISSET(fd, &fds);
+}
+
+long millis() {
+	if (gettimeofday(&tv1, NULL) == -1)
+		pdie("gettimeofday");
+	return tv1.tv_sec*1000 + tv1.tv_usec/1000;
+}
+
+void read_message(int fd_in, int fd_out)
+{
+	uint8_t c;
+	//Find next task
+
+	read(fd_in, &c, 1);
+	debug("Receiving input: %c\n", c);
+	switch(c){
+	case MSG_SDS_SPEC:
+		debug("Receiving an sds\n");
+		sds_register(fd_in);
+		break;
+	case MSG_SDS_UPD:
+		debug("Receiving an sds\n");
+		//TODO do something with the return value
+		sds_update(fd_in);
+		break;
+	case MSG_DEL_TASK:
+		debug("Receiving a delete task request\n");
+		task_delete(fd);
+		break;
+	case MSG_GET_TASK:
+		debug("Receiving a task\n");
+		c = task_register(fd_in);
+		write(fd_out, &c, 1);
+		break;
+	default:
+		debug("Unknown message: %X?\n", c);
+	}
+}
+
+void open_filedescriptors()
+{
+	struct sockaddr_in sa;
+
+	bzero((char *) &sa, sizeof(sa));
+	sa.sin_family = AF_INET;
+	sa.sin_addr.s_addr = INADDR_ANY;
+	sa.sin_port = htons(port);
+
+	if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
+		pdie("socket");
+	if(bind(sock_fd, (struct sockaddr*)&sa, sizeof(sa)) == -1)
+		pdie("bind\n");
+	if(listen(sock_fd, 10) == -1)
+		pdie("bind\n");
+
+	printf("Listening on %d\n", port);
+	fflush(stdout);
+	if((fd = accept(sock_fd, (struct sockaddr*)NULL, NULL)) == -1)
+		pdie("accept");
+}
+
+void usage(FILE *o, char *arg0){
+	fprintf(o,
+		"Usage: %s [opts]\n"
+		"\n"
+		"Options\n"
+		"-p PORT  Custom port number, default: 8123\n"
+		, arg0);
+}
+
+int main(int argc, char *argv[])
+{
+	int ct;
+
+	//Register signal handler
+	if(signal(SIGINT, killHandler) == SIG_ERR){
+		die("Couldn't register signal handler...\n");
+	}
+	if(signal(SIGTERM, killHandler) == SIG_ERR){
+		die("Couldn't register signal handler...\n");
+	}
+
+	//Command line arguments
+	int opt;
+	while((opt = getopt(argc, argv, "hp:")) != -1){
+		switch(opt){
+			case 'p':
+				port = atoi(optarg);
+				if(port < 1)
+					die("Port numbers are > 1\n");
+				break;
+			case 'h':
+				usage(stdout, argv[0]);
+				exit(EXIT_SUCCESS);
+			default:
+				usage(stderr, argv[0]);
+				exit(EXIT_FAILURE);
+		}
+
+	}
+
+	open_filedescriptors();
+
+	long cyclestart;
+	struct task *curtask;
+	while(true){
+		//Check for new tasks
+		if(input_available(fd))
+			read_message(fd, fd);
+		//Run tasks
+		cyclestart = millis();
+		for(ct = 0; ct<MAXTASKS; ct++){
+			//See whether the task is even in use
+			if((curtask = task_get(ct)) == NULL){
+				debug("Task %d not implemented\n", ct);
+				continue;
+			}
+			//See whether the task interval has passed
+			if(cyclestart-curtask->lastrun < curtask->interval){
+				debug("Task %d not scheduled\n", ct);
+				continue;
+			}
+#ifdef DEBUG
+			printf("Current task to run: %d\n", ct);
+			getchar();
+#endif
+			run_task(curtask);
+		}
+		usleep(10);
+	}
+	return 0;
+}
diff --git a/int/misc.h b/int/misc.h
new file mode 100644
index 0000000..83e3ac8
--- /dev/null
+++ b/int/misc.h
@@ -0,0 +1,17 @@
+#ifndef MISC_H
+#define MISC_H
+
+#define DEBUG
+
+#ifdef DEBUG
+#define debug(s, ...) printf(s, ##__VA_ARGS__);
+#define trace(op, ...) printf("pc: %d, sp: %d, op: " op, pc, sp, ##__VA_ARGS__);
+#else
+#define debug(s, ...) ;
+#define trace(pc, sp, op) ;
+#endif
+
+#define pdie(s) {perror(s); exit(1);}
+#define die(s, ...) {fprintf(stderr, s, ##__VA_ARGS__); exit(1);}
+
+#endif
diff --git a/int/sds.c b/int/sds.c
new file mode 100644
index 0000000..3a3c8fe
--- /dev/null
+++ b/int/sds.c
@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "mTaskSymbols.h"
+#include "interpret.h"
+#include "misc.h"
+#include "sds.h"
+
+struct sds sdss[MAXSDSS] = {0};
+uint8_t c;
+
+void sds_register(int fd)
+{
+	uint8_t cs;
+	for(cs = 0; cs<MAXSDSS; cs++)
+		if(!sdss[cs].used)
+			break;
+
+	if(cs == MAXSDSS)
+		die("Trying to add too much tasks...\n");
+
+	memset(&sdss[cs], 0, sizeof(struct sds));
+	//Read identifier
+	read(fd, &c, 1);
+	sdss[cs].id = c;
+
+	//Read value
+	read(fd, &c, 1);
+	sdss[cs].value = 255*c;
+	read(fd, &c, 1);
+	sdss[cs].value += c;
+
+	debug("Received sds %d: %d\n", sdss[cs].id, sdss[cs].value);
+	sdss[cs].used = true;
+}
+
+bool sds_update(int fd)
+{
+	uint8_t cs, id;
+	//Read identifier
+	read(fd, &id, 1);
+
+	for(cs = 0; cs<MAXSDSS; cs++){
+		if(!sdss[cs].used)
+			continue;
+		if(sdss[cs].id == id){
+			//Read value
+			read(fd, &c, 1);
+			sdss[cs].value = 255*c;
+			read(fd, &c, 1);
+			sdss[cs].value += c;
+			return true;
+		}
+	}
+	return false;
+}
diff --git a/int/sds.h b/int/sds.h
new file mode 100644
index 0000000..e58c072
--- /dev/null
+++ b/int/sds.h
@@ -0,0 +1,17 @@
+#ifndef SDS_H
+#define SDS_H
+
+#include <stdbool.h>
+
+#define MAXSDSS 100
+
+struct sds {
+	int id;
+	int value;
+	bool used;
+};
+
+void sds_register(int fd);
+bool sds_update(int fd);
+
+#endif
diff --git a/int/task.c b/int/task.c
new file mode 100644
index 0000000..13fbd07
--- /dev/null
+++ b/int/task.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "misc.h"
+#include "task.h"
+
+struct task tasks[MAXTASKS] = {0};
+uint8_t c;
+
+int task_register(int fd)
+{
+	uint8_t ct;
+
+	for(ct = 0; ct<MAXTASKS; ct++)
+		if(!tasks[ct].used)
+			break;
+	if(ct == MAXTASKS)
+		die("Trying to add too much tasks...\n");
+
+	memset(&tasks[ct], 0, sizeof(struct task));
+	//Read interval
+	read(fd, &c, 1);
+	tasks[ct].interval = 256*c;
+	read(fd, &c, 1);
+	tasks[ct].interval += c;
+	//Read tasklength
+	read(fd, &c, 1);
+	tasks[ct].tlen = 256*c;
+	read(fd, &c, 1);
+	tasks[ct].tlen += c;
+	if(tasks[ct].tlen > MAXTASKSIZE)
+		die("Task is too long: %d\n", tasks[ct].tlen);
+	//Read task bytecode
+	for(int i = 0; i<tasks[ct].tlen; i++){
+		debug("Read %d\n", i);
+		read(fd, tasks[ct].bc+i, 1);
+		debug("t[][%i]: %d\n", i,
+			tasks[ct].bc[i]);
+	}
+	//Return the task number for later removal
+	debug("Received a task of length %d\n", tasks[ct].tlen);
+	tasks[ct].used = true;
+	return ct;
+}
+
+void task_delete(int fd)
+{
+	read(fd, &c, 1);
+	tasks[c].used = false;
+}
+
+struct task *task_get(int num)
+{
+	return tasks[num].used ? &tasks[num] : NULL;
+}
diff --git a/int/task.h b/int/task.h
new file mode 100644
index 0000000..8f51171
--- /dev/null
+++ b/int/task.h
@@ -0,0 +1,22 @@
+#ifndef TASK_H
+#define TASK_H
+
+#define MAXTASKS 5
+#define MAXTASKSIZE 1024
+
+#include <stdint.h>
+#include <stdbool.h>
+
+struct task {
+	uint8_t bc[MAXTASKSIZE];
+	uint16_t tlen;
+	uint16_t interval;
+	long lastrun;
+	bool used;
+};
+
+int task_register(int fd);
+void task_delete(int fd);
+struct task *task_get(int num);
+
+#endif