Shared memory and semaphore setup as well as correct free() calls

generator.c

@@ -10,6 +10,8 @@
 
 static const char *pname;
 
+static struct circ_buf *shared;
+
 struct sigaction sa;
 
 struct AdjListNode {
@@ -26,6 +28,8 @@ struct Graph {
 	struct AdjList *array;
 };
 
+static struct Graph graph;
+
 static volatile sig_atomic_t quit = 0;
 
 static void sig_handler(int signum)
@@ -50,24 +54,21 @@ struct AdjListNode *newAdjListNode(int dest)
 	return newNode;
 }
 
-struct Graph *createGraph(int V)
+void createGraph(int V)
 {
-	struct Graph *graph = malloc(sizeof(struct Graph));
-	graph->V = V;
+	graph.V = V;
 
-	graph->array = malloc(V * sizeof(struct AdjList));
+	graph.array = malloc(V * sizeof(struct AdjList));
 
 	for (int i = 0; i < V; i++)
-		graph->array[i].head = NULL;
-	
-	return graph;
+		graph.array[i].head = NULL;
 }
 
-void addEdge(struct Graph *graph, int src, int dest)
+void addEdge(int src, int dest)
 {
 	struct AdjListNode *newNode = newAdjListNode(dest);
-	newNode->next = graph->array[src].head;
-	graph->array[src].head = newNode;
+	newNode->next = graph.array[src].head;
+	graph.array[src].head = newNode;
 }
 
 int strToInt(char *str)
@@ -89,11 +90,9 @@ int strToInt(char *str)
 	return (int) val;
 }
 
-struct Graph *parse(int argc, char *argv[])
+void parse(int argc, char *argv[])
 {
-	char *edge;
 	char *token;
-	char *str;
 	int V = 0;
 	int src;
 	int dest;
@@ -101,10 +100,17 @@ struct Graph *parse(int argc, char *argv[])
 	int edges[(argc - 1) * 2];
 
 	for (int i = 1; i < argc; i++) {
-		edge = argv[i];
-		str = strdup(edge);
+		char const *edge = argv[i];
+		char *str, *orig_copy;
+		str = orig_copy = strdup(edge);
 		int count = 0;
 		while ((token = strsep(&str, "-"))) {
+			if (str == NULL) {
+				fprintf(stderr, "[%s] An edge consists of two "
+						"nodes separated by a dash\n", pname);
+				free(orig_copy);
+				return;
+			}
 			if (count == 0) {
 				src = strToInt(token);
 				edges[edges_counter] = src;
@@ -122,18 +128,18 @@ struct Graph *parse(int argc, char *argv[])
 			if (count > 1) {
 				fprintf(stderr, "[%s] An edge consists of two "
 						"nodes separated by a dash\n", pname);
-				free(str);
-				return NULL;
+				free(orig_copy);
+				return;
 			}
 			switch (src) {
 			case -2:
-				free(str);
-				return NULL;
+				free(orig_copy);
+				return;
 				break;
 			case -1:
 				fprintf(stderr, "%s\n", edge);
-				free(str);
-				return NULL;
+				free(orig_copy);
+				return;
 				break;
 			default:
 				break;
@@ -141,21 +147,19 @@ struct Graph *parse(int argc, char *argv[])
 
 			count++;
 		}
-		free(str);
+		free(orig_copy);
 	}
 
-	struct Graph *graph = createGraph(V+1);
+	createGraph(V+1);
 	for (int i = 0; i < (sizeof(edges) / sizeof(int)); i+=2) {
-		addEdge(graph, edges[i], edges[i+1]);
+		addEdge(edges[i], edges[i+1]);
 	}
-
-	return graph;
 }
 
-void printGraph(struct Graph *graph)
+void printGraph()
 {
-	for (int v = 0; v < graph->V; v++) {
-		struct AdjListNode* pCrawl = graph->array[v].head;
+	for (int v = 0; v < graph.V; v++) {
+		struct AdjListNode* pCrawl = graph.array[v].head;
 		printf("\n Adjacency list of vertex %d\n head ", v);
 		while (pCrawl) {
 			printf("-> %d", pCrawl->dest);
@@ -165,6 +169,27 @@ void printGraph(struct Graph *graph)
 	}
 }
 
+void putItem(int itemValue)
+{
+	shared->validItems++;
+	shared->data[shared->tail] = itemValue;
+	shared->tail = (shared->tail + 1) % MAX_ITEMS;
+}
+
+void cleanup()
+{
+	for (int v = 0; v < graph.V; v++) {
+		struct AdjListNode *pCrawl = graph.array[v].head;
+		struct AdjListNode *tmp;
+		while (pCrawl) {
+			tmp = pCrawl;
+			pCrawl = pCrawl->next;
+			free(tmp);
+		}
+	}
+	free(graph.array);
+}
+
 int main(int argc, char *argv[])
 {
 	if (argc == 1)
@@ -177,23 +202,36 @@ int main(int argc, char *argv[])
 	sigaction(SIGINT, &sa, NULL);
 	sigaction(SIGTERM, &sa, NULL);
 
-	struct Graph *graph;
-
-	while (quit == 0) {
-		graph = parse(argc, argv);
-		if (graph == NULL) {
-			for (int i = 0; i < graph->V; i++) {
-				free(graph->array[i].head);
-			}
-			free(graph->array);
-			free(graph);
+	/*
+	int shmfd = shm_open(SHM_NAME, O_RDWR | O_CREAT, PERMISSION);
+	if (shmfd == -1) {
+		perror(pname);
 		exit(EXIT_FAILURE);
 	}
-		printGraph(graph);
-		free(graph->array);
-		free(graph);
+
+	shared = mmap(NULL, sizeof(*shared), PROT_WRITE, MAP_SHARED, shmfd, 0);
+	if (shared == MAP_FAILED) {
+		perror(pname);
+		exit(EXIT_FAILURE);
+	}
+
+	sem_t *sFreeSpace = sem_open(SEM_FREE_SPACE, 0);
+	sem_t *sUsedSpace = sem_open(SEM_USED_SPACE, 0);
+	sem_t *sWriteEnd = sem_open(SEM_WRITE_END, O_CREAT, PERMISSION, 1);
+	if (sFreeSpace == SEM_FAILED || sUsedSpace == SEM_FAILED || sWriteEnd == SEM_FAILED) {
+		perror(pname);
+		exit(EXIT_FAILURE);
+		}
+	*/
+
+	parse(argc, argv);
+
+	while (quit == 0) {
+		printGraph();
 		break;
 	}
 
+	cleanup();
+
 	return 0;
 }