diff --git a/BAN/BAN/String.cpp b/BAN/BAN/String.cpp
index b1b4c95a..78031697 100644
--- a/BAN/BAN/String.cpp
+++ b/BAN/BAN/String.cpp
@@ -230,7 +230,7 @@ namespace BAN
 		size_type new_cap = BAN::Math::max<size_type>(size, m_capacity * 2);
 		void* new_data = BAN::allocator(new_cap);
 		if (new_data == nullptr)
-			return Error::from_string("String: Could not allocate memory");
+			return Error::from_errno(ENOMEM);
 		if (m_data)
 			memcpy(new_data, m_data, m_size + 1);
 		BAN::deallocator(m_data);
diff --git a/BAN/include/BAN/Errors.h b/BAN/include/BAN/Errors.h
index 177d78e4..b18cbb9e 100644
--- a/BAN/include/BAN/Errors.h
+++ b/BAN/include/BAN/Errors.h
@@ -3,6 +3,7 @@
 #include <BAN/Formatter.h>
 #include <BAN/Variant.h>
 
+#include <errno.h>
 #include <string.h>
 
 #if defined(__is_kernel)
@@ -29,6 +30,14 @@ namespace BAN
 			result.m_error_code = 0xFF;
 			return result;
 		}
+		static Error from_errno(int error)
+		{
+			Error result;
+			strncpy(result.m_message, strerror(error), sizeof(m_message));
+			result.m_message[sizeof(result.m_message) - 1] = '\0';
+			result.m_error_code = error;
+			return result;
+		}
 
 		uint8_t get_error_code() const { return m_error_code; }
 		const char* get_message() const { return m_message; }
diff --git a/BAN/include/BAN/HashMap.h b/BAN/include/BAN/HashMap.h
index 91c3dccb..b9e0a582 100644
--- a/BAN/include/BAN/HashMap.h
+++ b/BAN/include/BAN/HashMap.h
@@ -123,7 +123,7 @@ namespace BAN
 		auto& bucket = get_bucket(key);
 		auto result = bucket.emplace_back(key, forward<Args>(args)...);
 		if (result.is_error())
-			return Error::from_string("HashMap: Could not allocate memory");
+			return Error::from_errno(ENOMEM);
 		m_size++;
 		return {};
 	}
@@ -212,7 +212,7 @@ namespace BAN
 		size_type new_bucket_count = BAN::Math::max<size_type>(bucket_count, m_buckets.size() * 2);
 		Vector<LinkedList<Entry>> new_buckets;
 		if (new_buckets.resize(new_bucket_count).is_error())
-			return Error::from_string("HashMap: Could not allocate memory");
+			return Error::from_errno(ENOMEM);
 		
 		// NOTE: We have to copy the old entries to the new entries and not move
 		//       since we might run out of memory half way through.
@@ -222,7 +222,7 @@ namespace BAN
 			{
 				size_type bucket_index = HASH()(entry.key) % new_buckets.size();
 				if (new_buckets[bucket_index].push_back(entry).is_error())
-					return Error::from_string("HashMap: Could not allocate memory");
+					return Error::from_errno(ENOMEM);
 			}
 		}
 
diff --git a/BAN/include/BAN/HashSet.h b/BAN/include/BAN/HashSet.h
index 7656ba77..4e7e1aeb 100644
--- a/BAN/include/BAN/HashSet.h
+++ b/BAN/include/BAN/HashSet.h
@@ -197,7 +197,7 @@ namespace BAN
 		size_type new_bucket_count = BAN::Math::max<size_type>(bucket_count, m_buckets.size() * 2);
 		Vector<Vector<T>> new_buckets;
 		if (new_buckets.resize(new_bucket_count).is_error())
-			return Error::from_string("HashSet: Could not allocate memory");
+			return Error::from_errno(ENOMEM);
 		
 		// NOTE: We have to copy the old keys to the new keys and not move
 		//       since we might run out of memory half way through.
@@ -207,7 +207,7 @@ namespace BAN
 			{
 				size_type bucket_index = HASH()(key) % new_buckets.size();
 				if (new_buckets[bucket_index].push_back(key).is_error())
-					return Error::from_string("HashSet: Could not allocate memory");
+					return Error::from_errno(ENOMEM);
 			}
 		}
 
diff --git a/BAN/include/BAN/LinkedList.h b/BAN/include/BAN/LinkedList.h
index bac44b88..e270a9a7 100644
--- a/BAN/include/BAN/LinkedList.h
+++ b/BAN/include/BAN/LinkedList.h
@@ -288,7 +288,7 @@ namespace BAN
 	{
 		Node* node = (Node*)BAN::allocator(sizeof(Node));
 		if (node == nullptr)
-			return Error::from_string("LinkedList: Could not allocate memory");	
+			return Error::from_errno(ENOMEM);	
 		return node;
 	}
 
diff --git a/BAN/include/BAN/Memory.h b/BAN/include/BAN/Memory.h
index 05854024..5a06ef3a 100644
--- a/BAN/include/BAN/Memory.h
+++ b/BAN/include/BAN/Memory.h
@@ -73,7 +73,7 @@ namespace BAN
 		{
 			uint32_t* count = new uint32_t(1);
 			if (!count)
-				return Error::from_string("RefCounted: Could not allocate memory");
+				return Error::from_errno(ENOMEM);
 			return RefCounted<T>((T*)data, count);
 		}
 
@@ -82,10 +82,10 @@ namespace BAN
 		{
 			uint32_t* count = new uint32_t(1);
 			if (!count)
-				return Error::from_string("RefCounted: Could not allocate memory");
+				return Error::from_errno(ENOMEM);
 			T* data = new T(forward<Args>(args)...);
 			if (!data)
-				return Error::from_string("RefCounted: Could not allocate memory");
+				return Error::from_errno(ENOMEM);
 			return RefCounted<T>(data, count);
 		}
 
diff --git a/BAN/include/BAN/Queue.h b/BAN/include/BAN/Queue.h
index 0ca50972..9ec8b14c 100644
--- a/BAN/include/BAN/Queue.h
+++ b/BAN/include/BAN/Queue.h
@@ -205,7 +205,7 @@ namespace BAN
 		size_type new_cap = BAN::Math::max<size_type>(size, m_capacity * 2);
 		T* new_data = (T*)BAN::allocator(new_cap * sizeof(T));
 		if (new_data == nullptr)
-			return Error::from_string("Queue: Could not allocate memory");
+			return Error::from_errno(ENOMEM);
 		for (size_type i = 0; i < m_size; i++)
 		{
 			new (new_data + i) T(move(m_data[i]));
diff --git a/BAN/include/BAN/Vector.h b/BAN/include/BAN/Vector.h
index 3c1d01aa..69ca0877 100644
--- a/BAN/include/BAN/Vector.h
+++ b/BAN/include/BAN/Vector.h
@@ -400,7 +400,7 @@ namespace BAN
 		size_type new_cap = BAN::Math::max<size_type>(size, m_capacity * 2);
 		T* new_data = (T*)BAN::allocator(new_cap * sizeof(T));
 		if (new_data == nullptr)
-			return Error::from_string("Vector: Could not allocate memory");
+			return Error::from_errno(ENOMEM);
 		for (size_type i = 0; i < m_size; i++)
 		{
 			new (new_data + i) T(move(m_data[i]));
diff --git a/kernel/kernel/FS/Ext2.cpp b/kernel/kernel/FS/Ext2.cpp
index 10d40b04..31d0935e 100644
--- a/kernel/kernel/FS/Ext2.cpp
+++ b/kernel/kernel/FS/Ext2.cpp
@@ -228,7 +228,7 @@ namespace Kernel
 	BAN::ErrorOr<BAN::Vector<uint8_t>> Ext2Inode::read_all()
 	{
 		if (ifdir())
-			return BAN::Error::from_string("Inode is a directory");
+			return BAN::Error::from_errno(EISDIR);
 
 		BAN::Vector<uint8_t> data_buffer;
 		TRY(data_buffer.resize(m_inode.size));
@@ -256,7 +256,7 @@ namespace Kernel
 	BAN::ErrorOr<BAN::RefCounted<Inode>> Ext2Inode::directory_find(BAN::StringView file_name)
 	{
 		if (!ifdir())
-			return BAN::Error::from_string("Inode is not a directory");
+			return BAN::Error::from_errno(ENOTDIR);
 
 		BAN::RefCounted<Inode> result;
 		BAN::Function<BAN::ErrorOr<bool>(const BAN::Vector<uint8_t>&)> function(
@@ -272,7 +272,7 @@ namespace Kernel
 					{
 						Ext2Inode* inode = new Ext2Inode(m_fs, TRY(m_fs->read_inode(entry->inode)), entry_name);
 						if (inode == nullptr)
-							return BAN::Error::from_string("Could not allocate Ext2Inode");
+							return BAN::Error::from_errno(ENOMEM);
 						result = TRY(BAN::RefCounted<Inode>::adopt(inode));
 						return false;
 					}
@@ -285,13 +285,13 @@ namespace Kernel
 		TRY(for_each_block(function));
 		if (result)
 			return result;
-		return BAN::Error::from_string("Could not find the asked inode");
+		return BAN::Error::from_errno(ENOENT);
 	}
 
 	BAN::ErrorOr<BAN::Vector<BAN::RefCounted<Inode>>> Ext2Inode::directory_inodes()
 	{
 		if (!ifdir())
-			return BAN::Error::from_string("Inode is not a directory");
+			return BAN::Error::from_errno(ENOTDIR);
 
 		BAN::Vector<BAN::RefCounted<Inode>> inodes;
 		BAN::Function<BAN::ErrorOr<bool>(const BAN::Vector<uint8_t>&)> function(
@@ -309,7 +309,7 @@ namespace Kernel
 
 						Ext2Inode* inode = new Ext2Inode(m_fs, BAN::move(current_inode), entry_name);
 						if (inode == nullptr)
-							return BAN::Error::from_string("Could not allocate memory for Ext2Inode");
+							return BAN::Error::from_errno(ENOMEM);
 						TRY(inodes.push_back(TRY(BAN::RefCounted<Inode>::adopt(inode))));
 					}
 					entry_addr += entry->rec_len;
@@ -327,7 +327,7 @@ namespace Kernel
 	{
 		Ext2FS* ext2fs = new Ext2FS(partition);
 		if (ext2fs == nullptr)
-			return BAN::Error::from_string("Could not allocate Ext2FS");
+			return BAN::Error::from_errno(ENOMEM);
 		TRY(ext2fs->initialize_superblock());
 		TRY(ext2fs->initialize_block_group_descriptors());
 		TRY(ext2fs->initialize_root_inode());
@@ -343,7 +343,7 @@ namespace Kernel
 		{
 			uint8_t* superblock_buffer = (uint8_t*)kmalloc(1024);
 			if (superblock_buffer == nullptr)
-				return BAN::Error::from_string("Could not allocate memory for superblocks");
+				BAN::Error::from_errno(ENOMEM);
 			BAN::ScopeGuard _([superblock_buffer] { kfree(superblock_buffer); });
 
 			uint32_t lba = 1024 / sector_size;
@@ -399,7 +399,7 @@ namespace Kernel
 
 		uint8_t* block_group_descriptor_table_buffer = (uint8_t*)kmalloc(block_group_descriptor_table_sector_count * sector_size);
 		if (block_group_descriptor_table_buffer == nullptr)
-			return BAN::Error::from_string("Could not allocate memory for block group descriptor table");
+			return BAN::Error::from_errno(ENOMEM);
 		BAN::ScopeGuard _([block_group_descriptor_table_buffer] { kfree(block_group_descriptor_table_buffer); });
 
 		TRY(m_partition.read_sectors(
@@ -428,12 +428,11 @@ namespace Kernel
 
 	BAN::ErrorOr<void> Ext2FS::initialize_root_inode()
 	{
-
 		Ext2Inode* root_inode = new Ext2Inode(this, TRY(read_inode(Ext2::Enum::ROOT_INO)), "");
 		if (root_inode == nullptr)
-			return BAN::Error::from_string("Could not allocate Ext2Inode");
+			return BAN::Error::from_errno(ENOMEM);
 		m_root_inode = TRY(BAN::RefCounted<Inode>::adopt(root_inode));
-		
+
 #if EXT2_DEBUG_PRINT
 		dprintln("root inode:");
 		dprintln("  created  {}", ext2_root_inode().ctime);
diff --git a/kernel/kernel/FS/VirtualFileSystem.cpp b/kernel/kernel/FS/VirtualFileSystem.cpp
index 47b4c31a..0b38222e 100644
--- a/kernel/kernel/FS/VirtualFileSystem.cpp
+++ b/kernel/kernel/FS/VirtualFileSystem.cpp
@@ -15,7 +15,7 @@ namespace Kernel
 		ASSERT(s_instance == nullptr);
 		s_instance = new VirtualFileSystem();
 		if (s_instance == nullptr)
-			return BAN::Error::from_string("Could not allocate the Virtual File System");
+			return BAN::Error::from_errno(ENOMEM);
 		return s_instance->initialize_impl();
 	}
 	
diff --git a/kernel/kernel/Shell.cpp b/kernel/kernel/Shell.cpp
index 1c847cc4..53f5ff4f 100644
--- a/kernel/kernel/Shell.cpp
+++ b/kernel/kernel/Shell.cpp
@@ -271,9 +271,6 @@ argument_done:
 				return TTY_PRINTLN("{}", directory_or_error.error());
 			auto directory = directory_or_error.release_value();
 
-			if (!directory->ifdir())
-				return TTY_PRINTLN("Given path does not point to a directory");
-
 			auto inodes_or_error = directory->directory_inodes();
 			if (inodes_or_error.is_error())
 				return TTY_PRINTLN("{}", inodes_or_error.error());
diff --git a/kernel/kernel/Storage/ATAController.cpp b/kernel/kernel/Storage/ATAController.cpp
index 8dd5fadf..fd199f29 100644
--- a/kernel/kernel/Storage/ATAController.cpp
+++ b/kernel/kernel/Storage/ATAController.cpp
@@ -54,7 +54,7 @@ namespace Kernel
 	{
 		ATAController* controller = new ATAController(device);
 		if (controller == nullptr)
-			return BAN::Error::from_string("Could not allocate memory for ATAController");
+			return BAN::Error::from_errno(ENOMEM);
 		TRY(controller->initialize());
 		return controller;
 	}
@@ -256,7 +256,7 @@ namespace Kernel
 			if (status & ATA_STATUS_ERR)
 				return error();
 			if (status & ATA_STATUS_DF)
-				return BAN::Error::from_string("Device fault");
+				return BAN::Error::from_errno(EIO);
 			status = read(ATA_PORT_STATUS);
 		}
 
diff --git a/libc/Makefile b/libc/Makefile
index 45fbf117..d8d5b2e8 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -41,9 +41,10 @@ string/memcpy.o \
 string/memmove.o \
 string/memset.o \
 string/strcmp.o \
-string/strncmp.o \
 string/strcpy.o \
+string/strerror.o \
 string/strlen.o \
+string/strncmp.o \
 string/strncpy.o \
 string/strstr.o \
  
diff --git a/libc/include/errno.h b/libc/include/errno.h
new file mode 100644
index 00000000..34052c3f
--- /dev/null
+++ b/libc/include/errno.h
@@ -0,0 +1,16 @@
+#pragma once
+
+#include <sys/cdefs.h>
+
+#define ENOMEM 1
+#define EINVAL 2
+#define ENOTDIR 3
+#define EISDIR 4
+#define ENOENT 5
+#define EIO 6
+
+__BEGIN_DECLS
+
+extern int errno;
+
+__END_DECLS
\ No newline at end of file
diff --git a/libc/include/string.h b/libc/include/string.h
index 491a36a3..6f5844ee 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -19,4 +19,6 @@ char* strncpy(char* __restrict, const char* __restrict, size_t);
 
 char* strstr(const char*, const char*);
 
+char* strerror(int);
+
 __END_DECLS
\ No newline at end of file
diff --git a/libc/string/strerror.cpp b/libc/string/strerror.cpp
new file mode 100644
index 00000000..4a554a8b
--- /dev/null
+++ b/libc/string/strerror.cpp
@@ -0,0 +1,32 @@
+#include <errno.h>
+#include <string.h>
+
+int errno = 0;
+
+char* strerror(int error)
+{
+	switch (error)
+	{
+	case ENOMEM:
+		return "Cannot allocate memory";
+	case EINVAL:
+		return "Invalid argument";
+	case EISDIR:
+		return "Is a directory";
+	case ENOTDIR:
+		return "Not a directory";
+	case ENOENT:
+		return "No such file or directory";
+	case EIO:
+		return "Input/output error";
+	default:
+		break;
+	}
+
+	// FIXME: sprintf
+	//static char buffer[26];
+	//sprintf(buffer, "Unknown error %d", error);
+	//return buffer;
+	errno = EINVAL;
+	return "Unknown error";
+}
\ No newline at end of file