gettid syscall, fix issues with vmm and mmap syscall

src/include/kernel/syscalls.h

@@ -11,5 +11,6 @@ typedef struct {
 
 syscallret syscall_libc_log(char* str);
 syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int fd, off_t offset);
+syscallret syscall_gettid();
 
 #endif

src/include/kernel/vmm.h

@@ -55,7 +55,7 @@ typedef struct {
 
 void vmm_init();
 
-bool 		vmm_dealwithrequest(void* addr);
+bool 		vmm_dealwithrequest(void* addr, long error, bool user);
 bool 		vmm_setused(void* addr, size_t pagec, size_t mmuflags);
 bool		vmm_unmap(void* addr, size_t pagec);
 bool		vmm_map(void* paddr, void* vaddr, size_t pagec, size_t mmuflags);