Kernel/LibC: Implement chroot

userspace/libraries/LibC/include/sys/syscall.h

@@ -113,6 +113,7 @@ __BEGIN_DECLS
 	O(SYS_FUTEX,			futex)			\
 	O(SYS_GETGROUPS,		getgroups)		\
 	O(SYS_SETGROUPS,		setgroups)		\
+	O(SYS_CHROOT,			chroot)			\
 
 enum Syscall
 {

userspace/libraries/LibC/include/unistd.h

@@ -596,6 +596,7 @@ int					unlinkat(int fd, const char* path, int flag);
 int					usleep(useconds_t usec);
 ssize_t				write(int fildes, const void* buf, size_t nbyte);
 
+int					chroot(const char* path);
 int					getpagesize(void);
 char*				getpass(const char* prompt);
 

userspace/libraries/LibC/unistd.cpp

@@ -626,6 +626,11 @@ int getopt(int argc, char* const argv[], const char* optstring)
 	return '?';
 }
 
+int chroot(const char* path)
+{
+	return syscall(SYS_CHROOT, path);
+}
+
 int getpagesize(void)
 {
 	return PAGE_SIZE;