Share GraphicsBitmaps between the windowing server and the client process.

This is pretty cool. :^)

GraphicsBitmaps are now mapped into both the server and the client address
space (usually at different addresses but that doesn't matter.)

Added a GUI syscall for getting a window's backing store, and another one
for invalidating a window so that the server redraws it.

LibC/Makefile

@@ -5,6 +5,9 @@ AK_OBJS = \
     ../AK/FileSystemPath.o \
     ../AK/kmalloc.o
 
+WIDGETS_OBJS = \
+    ../Widgets/Color.o
+
 LIBC_OBJS = \
        stdio.o \
        unistd.o \
@@ -35,7 +38,7 @@ LIBC_OBJS = \
        utime.o \
        entry.o
 
-OBJS = $(AK_OBJS) $(LIBC_OBJS)
+OBJS = $(AK_OBJS) $(WIDGETS_OBJS) $(LIBC_OBJS)
 
 LIBRARY = LibC.a
 ARCH_FLAGS =

LibC/stdlib.cpp

@@ -215,4 +215,18 @@ long atol(const char* str)
     return atoi(str);
 }
 
+
+static unsigned long s_next_rand = 1;
+
+int rand()
+{
+    s_next_rand = s_next_rand * 1103515245 + 12345;
+    return((unsigned)(s_next_rand/((RAND_MAX + 1) * 2)) % (RAND_MAX + 1));
+}
+
+void srand(unsigned seed)
+{
+    s_next_rand = seed;
+}
+
 }

LibC/stdlib.h

@@ -19,5 +19,9 @@ void qsort(void* base, size_t nmemb, size_t size, int (*compar)(const void *, co
 void exit(int status) __NORETURN;
 void abort() __NORETURN;
 
+#define RAND_MAX 32767
+int rand();
+void srand(unsigned seed);
+
 __END_DECLS