Kernel/LibC/Userspace: Implement mkdir and creat

Touch now uses creat insteadd of open with O_CREAT flag

libc/fcntl.cpp

@@ -4,6 +4,11 @@
 #include <sys/syscall.h>
 #include <unistd.h>
 
+int creat(const char* path, mode_t mode)
+{
+	return syscall(SYS_CREATE, path, S_IFREG | mode);
+}
+
 int open(const char* path, int oflag, ...)
 {
 	va_list args;

libc/include/sys/syscall.h

@@ -56,6 +56,8 @@ __BEGIN_DECLS
 #define SYS_TTY_CTRL 53
 #define SYS_POWEROFF 54
 #define SYS_CHMOD 55
+#define SYS_CREATE 56 // creat, mkfifo
+#define SYS_CREATE_DIR 57 // mkdir
 
 __END_DECLS
 

libc/sys/stat.cpp

@@ -28,3 +28,8 @@ int stat(const char* __restrict path, struct stat* __restrict buf)
 {
 	return syscall(SYS_STAT, path, buf, 0);
 }
+
+int mkdir(const char* path, mode_t mode)
+{
+	return syscall(SYS_CREATE_DIR, path, mode);
+}