diff --git a/Makefile b/Makefile
index 8296cda..b7d3026 100644
--- a/Makefile
+++ b/Makefile
@@ -16,9 +16,10 @@ test:
 	cp etc/example.cfg ./glacier.cfg
 
 lib:
-	mkdir lib
-	$(CC) libglacier.c -c $(LIBFLAGS) -o lib/libglacier.o
-	$(AR) -rc lib/libglacier.a lib/libglacier.o
+	mkdir build
+	mkdir build/lib
+	$(CC) libglacier.c -c $(LIBFLAGS) -o build/lib/libglacier.o
+	$(AR) -rc build/lib/libglacier.a build/lib/libglacier.o
 
 install:
 	install lib/libglacier.a $(PREFIX)/lib
@@ -28,4 +29,4 @@ install:
 	install include/glacier_runtime.h $(PREFIX)/include
 
 clean:
-	rm libglacier.test libglacier.a glacier.cfg
+	rm -rf build
diff --git a/include/glacier_config.h b/include/glacier_config.h
index 45ad128..59a25bb 100644
--- a/include/glacier_config.h
+++ b/include/glacier_config.h
@@ -22,16 +22,25 @@
  * init_config
  * DESCRIPTION: Init_config initializes the libconfig library, so it can read the required runtime files
  * PARAMETERS:
- * 		None.
+ * 		None. (void)
  * RETURN VAUES:
- * 		0 on success, 1 on failure
+ * 		0 on success, EXIT_FAILURE on failure
  * CAVEATS:
  * 		None.
  * EXAMPLE:
- * 		init_config();
+ * 		// It is best practice to check for ALL non-zero return values, rather than specific ones,
+ *		// as init_config() returns EXIT_FAILURE
+ *
+ * 		if (init_config() != 0) {
+ * 			errlog("Failed to initialize libconfig");
+ * 			return(EXIT_FAILURE); // fatal error requiring termination of program execution
+ * 		}
+ * 		else {
+ * 			successlog("Initialized libconfig"); // output automatically if LG_VERBOSE = 1
+ * 		}
  */
 
-int init_config();
+int init_config(void);
 
 /**************************************************************************************************************/
 
@@ -39,16 +48,19 @@ int init_config();
  * die_config
  * DESCRPTION: Die_config destroys the loaded libconfig library.
  * PARAMETERS:
- * 		None.
+ * 		None. (void)
  * RETURN VALUES:
- * 		0 on success, 1 on failure
+ * 		EXIT_SUCCESS on success
  * CAVEATS:
  * 		None.
  * EXAMPLE:
+ * 		// die_config() is unlikely to fail unless you tried to destroy an invalid object,
+ * 		// so checking for non-zero return values is unnecessary
+ *
  * 		die_config();
  */
 
-int die_config();
+int die_config(void);
 
 /**************************************************************************************************************/
 
@@ -56,7 +68,7 @@ int die_config();
  * load_all_from_config
  * DESCRIPTION: Initialize all settings from glacier.cfg.
  * PARAMETERS:
- * 		None.
+ * 		None. (void)
  * RETURN VALUES:
  * 		0 on success, 1 on file does not exist, 2 on library error
  * CAVEATS:
diff --git a/include/glacier_data.h b/include/glacier_data.h
index aa83a23..bec5c25 100644
--- a/include/glacier_data.h
+++ b/include/glacier_data.h
@@ -72,4 +72,85 @@ void add_child(struct node *parent, struct node *child);
 
 void print_tree(struct node *root, int level);
 
+/**************************************************************************************************************/
+
+/*
+ * init_queue
+ *
+ * DESCRIPTION: Init_queue initializes a queue data structue.
+ * PARAMETERS:
+ * 		queue *q -> The name of the queue to initialize
+ * RETURN VALUES:
+ * 		None.
+ * CAVEATS:
+ * 		None.
+ * EXAMPLE:
+ * 		init_queue("operation_queue");
+ */
+
+void init_queue(queue *q);
+
+/**************************************************************************************************************/
+
+/*
+ * queue_is_empty
+ *
+ * DESCRIPTION: Queue_is_empty checks if queue *q is empty
+ * PARAMETERS:
+ * 		queue *q -> The queue to check
+ * RETURN VALUES:
+ * 		true on empty, false on not empty
+ * CAVEATS:
+ * 		None.
+ * EXAMPLE:
+ * 		if (queue_is_empty(q)) {
+ * 			printf("Queue is empty\n");
+ * 			return;
+ * 		}
+ */
+
+bool queue_is_empty(queue *q);
+
+/**************************************************************************************************************/
+
+/*
+ * queue_is_full
+ *
+ * DESCRIPTION: Queue_is_full checks if queue *q is full 
+ * PARAMETERS:
+ * 		queue *q -> The queue to check
+ * RETURN VALUES:
+ * 		true on full, false on not full
+ * CAVEATS:
+ * 		None.
+ * EXAMPLE:
+ * 		if (queue_is_full(q)) {
+ * 			printf("Queue is full\n");
+ * 			return;
+ * 		}
+ */
+
+bool queue_is_full(queue *q);
+
+/**************************************************************************************************************/
+
+/*
+ * enqueue
+ *
+ * DESCRIPTION: Enqueue enqueues an element at the back of the queue
+ * PARAMETERS:
+ * 		queue *q -> The queue to enqueue to
+ * 		int value -> 
+ * RETURN VALUES:
+ * 		true on full, false on not full
+ * CAVEATS:
+ * 		None.
+ * EXAMPLE:
+ * 		if (queue_is_full(q)) {
+ * 			printf("Queue is full\n");
+ * 			return;
+ * 		}
+ */
+
+
 #endif
diff --git a/include/glacier_runtime.h b/include/glacier_runtime.h
index 1133f52..716b820 100644
--- a/include/glacier_runtime.h
+++ b/include/glacier_runtime.h
@@ -23,31 +23,47 @@
  *
  * DESCRIPTION: runtime_exists checks if all necessary runtime files exist.
  * PARAMETERS:
- * 		None.
+ * 		None. (void)
  * RETURN VALUES:
- * 		None.
+ * 		0 on one or more runtime files missing, 1 on all runtime files exist
  * CAVEATS:
  * 		None.
  * EXAMPLE:
- * 		runtime_exists();
+ * 		if (runtime_exists() == 0) {
+ * 			errlog("One or more runtime files missing");
+ * 			return 1;
+ * 		}
+ * 		else {
+ * 			successlog("All runtime files present");
+ * 			return 0;
+ * 		}
  */
 
-void runtime_exists();
+int runtime_exists(void);
 
 /*
  * is_process_root
  *
  * DESCRIPTION: is_process_root checks if the process is running with root privileges.
  * PARAMETERS:
- * 		None.
+ * 		None. (void)
  * RETURN VALUES:
- * 		0 on root, 1 on non-root
+ * 		0 on process is not running as root, 1 on process is running as root
  * CAVEATS:
  * 		None.
  * EXAMPLE:
- * 		is_process_root();
+ * 		// Assuming block is running within main(), no values will be returned.
+ *		// If you wish to exit the program if it is not running as root, it would
+ *		// be appropriate to add return values to this block
+ *
+ * 		if (is_process_root() == 0) {
+ * 			errlog("Process is not running as root");	
+ * 		}
+ * 		else {
+ * 			successlog("Process is running as root");
+ * 		}
  */
 
-int is_process_root();
+int is_process_root(void);
 
 #endif
diff --git a/include/glacier_security.h b/include/glacier_security.h
new file mode 100644
index 0000000..27ce1c7
--- /dev/null
+++ b/include/glacier_security.h
@@ -0,0 +1,38 @@
+/*
+ * 	glacier_runtime.h - Runtime function declarations for libglacier
+ *
+ * 	This file is part of Glacier.
+ *
+ * 	Glacier is free software: you can redistribute it and/or modify it under the terms of the
+ * 	GNU General Public License as published by the Free Software Foundation, either
+ * 	version 3 of the License, or (at your option) any later version.
+ *
+ * 	Glacier is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * 	without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * 	PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * 	You should have received a copy of the GNU General Public License along with Glacier. If
+ * 	not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef GLACIERSECURITY_H_
+#define GLACIERSECURITY_H_
+
+/*
+ * compare_file_hash
+ *
+ * DESCRIPTION: compare_file_hash compares the SHA256 hashes of a file and its original hash
+ * PARAMETERS:
+ * 		char ORIG_HASH[] -> The file containing the expected hash result
+ * 		char FILE[] -> The file to compare against ORIG_HASH[]
+ * RETURN VALUES:
+ * 		0 on hashes match, 1 on hashes do not match, -1 on library error
+ * CAVEATS:
+ * 		None.
+ * EXAMPLE:
+ * 		compare_file_hash("pkg.sha256sum", "pkg.tar.xz");
+ */
+
+int compare_file_hash(char ORIG_HASH[], char FILE[]);
+
+#endif
diff --git a/libglacier.c b/libglacier.c
index df4f1d0..cee9748 100644
--- a/libglacier.c
+++ b/libglacier.c
@@ -31,7 +31,9 @@
 
 #include "config.h"
 
+#define BUFFER_SIZE 1024
 #define MAX_CHILDREN 64
+#define MAX_SIZE 256
 
 /* Global variables */
 
@@ -62,6 +64,9 @@ struct node {
 	int numChildren;
 };
 
+FILE *expected_hash;
+FILE *pkg;
+
 /*
  * infolog
  *
@@ -152,21 +157,22 @@ successlog(char MSG[])
  */
 
 int
-runtime_exists()
+runtime_exists(void)
 {
 	int f;
 
-	for (f = 0; f < 3; f++) {
+	for (f = 0; f < sizeof(runtime_files); f++) {
 		if (access(runtime_files[f], F_OK) == 0) {
 			continue;
 		} else {
-			errlog("Runtime files are missing, cannot continue with operation.");
+			/* might keep this message, might not, idk */
+			/* errlog("Runtime files are missing, cannot continue with operation.");
 			printf(COL_RED "[x]" COL_RESET " The following files are missing:\n");
-			printf(COL_RED "[x]" COL_RESET " \t%s\n", runtime_files[f]);
-			return 1;
+			printf(COL_RED "[x]" COL_RESET " \t%s\n", runtime_files[f]); */
+			return 0;
 		}
 	}
-	return 0;
+	return 1;
 }
 
 /*
@@ -179,11 +185,13 @@ runtime_exists()
  */
 
 int
-is_process_root(char MSG[])
+is_process_root(void)
 {
 	if (getuid() != 0) {
-		fprintf(stderr, COL_RED "[x] " COL_RESET "%s\n", MSG);
-		exit(1);
+		return 0; /* process is not running as root */
+	}
+	else {
+		return 1; /* process is running as root */
 	}
 }
 
@@ -197,7 +205,7 @@ is_process_root(char MSG[])
  */
 
 int
-init_config()
+init_config(void)
 {
 	config_init(&cfg);
 
@@ -225,7 +233,7 @@ init_config()
  */
 
 int
-die_config()
+die_config(void)
 {
 	config_destroy(&cfg);
 
@@ -246,7 +254,7 @@ die_config()
  */
 
 int
-load_all_from_config()
+load_all_from_config(void)
 {
 	config_lookup_bool(&cfg, "GLACIER_DO_INT_CHECK", &GLACIER_DO_INT_CHECK);
 	config_lookup_bool(&cfg, "GLACIER_VERBOSE", &GLACIER_VERBOSE);
@@ -310,13 +318,13 @@ struct node
 }
 
 /*
-* add_child
-*
-* DESCRIPTION: Add a child node to a parent node.
-* PARAMETERS: struct node *parent, struct node *child
-* DEFINED IN: glacier_data.h
-*
-*/
+ * add_child
+ *
+ * DESCRIPTION: Add a child node to a parent node.
+ * PARAMETERS: struct node *parent, struct node *child
+ * DEFINED IN: glacier_data.h
+ *
+ */
 
 void
 add_child(struct node *parent, struct node *child)
@@ -356,6 +364,137 @@ print_tree(struct node *root, int level)
 	}
 }
 
+/* Definition of queue data type */
+typedef struct {
+	int items[MAX_SIZE];
+	int front;
+	int rear;
+} queue;
+
+/*
+* init_queue
+*
+* DESCRIPTION: Initialize a queue.
+* PARAMETERS: queue *q
+* DEFINED IN: glacier_data.h
+*
+*/
+
+void
+init_queue(queue *q)
+{
+	q -> front = -1;
+	q -> rear = 0;
+}
+
+/*
+* queue_is_empty
+*
+* DESCRIPTION: Check if queue is empty.
+* PARAMETERS: struct node *root, int level
+* DEFINED IN: glacier_data.h
+*
+*/
+
+bool queue_is_empty(queue *q) { return (q -> front == q -> rear -1); }
+
+/*
+* queue_is_full
+*
+* DESCRIPTION: Check if queue is full.
+* PARAMETERS: queue *q
+* DEFINED IN: glacier_data.h
+*
+*/
+
+bool queue_is_full(queue *q) { return (q -> rear == MAX_SIZE); }
+
+/*
+* enqueue
+*
+* DESCRIPTION: Enqueue an element at the back of the queue.
+* PARAMETERS: queue *q, int value
+* DEFINED IN: glacier_data.h
+*
+*/
+
+void
+enqueue (queue *q, int value)
+{
+	if (queue_is_full(q)) {
+		printf("Queue is full\n");
+		return;
+	}
+	
+	q -> items[q -> rear] = value;
+	q -> rear++;
+}
+
+/*
+* dequeue
+*
+* DESCRIPTION: Dequeue the element at the front of the queue.
+* PARAMETERS: queue *q, int value
+* DEFINED IN: glacier_data.h
+*
+*/
+
+void
+dequeue(queue *q)
+{
+	if (queue_is_empty(q)) {
+		printf("Queue is empty\n");
+		return;
+	}
+
+	q -> front++;
+}
+
+/*
+* peek
+*
+* DESCRIPTION: View the element at the front of the queue.
+* PARAMETERS: struct node *root, int level
+* DEFINED IN: glacier_data.h
+*
+*/
+
+int
+peek(queue *q)
+{
+	if (queue_is_empty(q)) {
+		printf("Queue is empty\n");
+		return -1;
+	}
+
+	return q -> items[q -> front + 1];
+}
+
+/*
+* print_queue
+*
+* DESCRIPTION: Print the queue.
+* PARAMETERS: queue *q
+* DEFINED IN: glacier_data.h
+*
+*/
+
+void
+print_queue(queue *q)
+{
+	if (queue_is_empty(q)) {
+		printf("Queue is empty\n");
+		return;
+	}
+
+	printf("Current Queue: ");
+	
+	for (int i = q -> front + 1; i < q -> rear; i++) {
+		printf("%d ", q -> items[i]);
+	}
+	printf("\n");
+}
+
 /*
  * mkworkspace
  *
@@ -366,17 +505,22 @@ print_tree(struct node *root, int level)
  */
 
 int
-mkworkspace()
+mkworkspace(void)
 {
 	DIR* workspace = opendir("/tmp/glacier-workspace");
 	if (workspace) {
-		infolog("Not creating new workspace, valid workspace already exists.");
+		/* infolog("Not creating new workspace, valid workspace already exists."); */
+		return 0;
 	} else if (ENOENT == errno) {
-		infolog("Creating new Glacier workspace...");
+		/* infolog("Creating new Glacier workspace..."); */
 		mkdir("/tmp/glacier-workspace", 0777);
+		return 1;
 	} else {
-		printf("LIBRARY ERROR: opendir() failed\n");
-		return 2;
+		if (LG_VERBOSE == 1) {
+			errlog("in mkworkspace()");
+			errlog("mkdir() failed to run");
+		}
+		return -1;
 	}
 }
 
@@ -492,3 +636,17 @@ run_make_task(char TASK[])
 	}
 }
 
+/*
+ * compare_file_hash
+ *
+ * DESCRIPTION: Compare two file hashes
+ * PARAMETERS: char ORIG_HASH[], char FILE[]
+ * DEFINED IN: glacier_security.h
+ *
+ */
+
+int
+compare_file_hash(char ORIG_HASH[], char FILE[])
+{
+
+}