diff --git a/userland/init_service/init.bin b/userland/init_service/init.bin
index b7557ef..1d54a3b 100755
Binary files a/userland/init_service/init.bin and b/userland/init_service/init.bin differ
diff --git a/userland/init_service/server.c b/userland/init_service/server.c
index 914ee90..0a13072 100644
--- a/userland/init_service/server.c
+++ b/userland/init_service/server.c
@@ -33,14 +33,6 @@ static int64_t allocate_user_stack(int slave_vspace, uint64_t stack_top, uint64_
     return stack_top; 
 }
 
-void *memcpy(void *dst, const void *src, uint64_t n) {
-    uint8_t *d = (uint8_t *)dst;
-    const uint8_t *s = (const uint8_t *)src;
-    while (n--)
-        *d++ = *s++;
-    return dst;
-}
-
 __attribute__((noreturn, section(".text._start")))
 void _start(BootInfo_t* boot_info) {
     int64_t ret;
@@ -181,4 +173,4 @@ void _start(BootInfo_t* boot_info) {
 
     printf("Slave process started, init going idle\n");
     for (;;) { spin_pause(); }
-}
\ No newline at end of file
+}
diff --git a/userland/libOs/shared.h b/userland/libOs/shared.h
index 05be5c0..354879c 100644
--- a/userland/libOs/shared.h
+++ b/userland/libOs/shared.h
@@ -1,12 +1,13 @@
 #pragma once
 
-#include "types.h"
-#include "syscalls.h"
-#include "stdlib.h"
-#include "stdio.h"
 #include "ipc.h"
 #include "memory.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "string.h"
+#include "syscalls.h"
 #include "tcb.h"
+#include "types.h"
 
 #define SYS_CAP_COPY 0x80
 
diff --git a/userland/libOs/string.h b/userland/libOs/string.h
new file mode 100644
index 0000000..6a0bacb
--- /dev/null
+++ b/userland/libOs/string.h
@@ -0,0 +1,71 @@
+#pragma once
+
+#include "types.h"
+
+static inline int memcmp(const char *s1, const char *s2, size_t n) {
+    unsigned char u1, u2;
+
+    for (; n--; s1++, s2++){
+        u1 = *(unsigned char *)s1;
+        u2 = *(unsigned char *)s2;
+
+        if (u1 != u2){
+            return (u1 - u2);
+        }
+    }
+
+    return 0;
+}
+
+static inline void* memcpy(void *restrict destination, const void *restrict source, size_t n) {
+    size_t *tmp_dest = (size_t *)destination;
+    size_t *tmp_src = (size_t *)source;
+    size_t len = n / sizeof(size_t);
+    size_t i = 0;
+    size_t tail = n & (sizeof(size_t) - 1);
+
+    for (; i < len; i++) {
+        *tmp_dest++ = *tmp_src++;
+    }
+
+    if(tail) {
+        char *dest = (char *)destination;
+        const char *src = (const char *)source;
+
+        for(i = n - tail; i < n; i++) {
+            dest[i] = src[i];
+        }
+    }
+
+	return destination;
+}
+
+static inline void* memset(void* ptr, int value, size_t num) {
+    uint8_t* bytes = ptr;
+
+    while(num--) {
+        *bytes++ = (uint8_t)value;
+    }
+}
+
+static inline void* memmove(void *dest, void *src, size_t count) {
+    void* ret = dest;
+
+	if (dest <= src || (char*)dest >= ((char*)src + count)) {
+		while (count--) {
+			*(char*)dest = *(char*)src;
+			dest = (char*)dest + 1;
+			src = (char*)src + 1;
+		}
+	} else {
+		dest = (char*)dest + count - 1;
+		src = (char*)src + count - 1;
+		while (count--) {
+			*(char*)dest = *(char*)src;
+			dest = (char*)dest - 1;
+			src = (char*)src - 1;
+		}
+	}
+
+	return ret;
+}
\ No newline at end of file
diff --git a/userland/libOs/syscalls.h b/userland/libOs/syscalls.h
index 8402b81..046874e 100644
--- a/userland/libOs/syscalls.h
+++ b/userland/libOs/syscalls.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "types.h"
+
 static inline int64_t syscall0(uint64_t number) {
     int64_t ret;
     __asm__ volatile (
diff --git a/userland/libOs/types.h b/userland/libOs/types.h
index 5fc1e01..5da9f2c 100644
--- a/userland/libOs/types.h
+++ b/userland/libOs/types.h
@@ -4,10 +4,21 @@ typedef unsigned char __uint8_t;
 typedef unsigned short int __uint16_t;
 typedef unsigned int __uint32_t;
 typedef unsigned long int __uint64_t;
+
+typedef signed char __int8_t;
+typedef signed short int __int16_t;
+typedef signed int __int32_t;
 typedef signed long int __int64_t;
 
 typedef __uint8_t uint8_t;
 typedef __uint16_t uint16_t;
 typedef __uint32_t uint32_t;
 typedef __uint64_t uint64_t;
+
+typedef __int8_t int8_t;
+typedef __int16_t int16_t;
+typedef __int32_t int32_t;
 typedef __int64_t int64_t;
+
+typedef __SIZE_TYPE__ size_t;
+typedef int64_t ssize_t;
\ No newline at end of file