memory: spilt code to module and tool

study/kernel/02-memory/00-code/tool/test.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(void)
+{
+	int fd = open("1.bat", O_RDWR|O_CREAT|O_TRUNC, 0777);
+	ftruncate(fd, 5000);
+
+	int pagesize = sysconf(_SC_PAGE_SIZE);
+	printf("pagesize = %d\n", pagesize);
+
+	char *addr_mmap_p = mmap(NULL, pagesize, PROT_WRITE, MAP_PRIVATE, fd, 0);
+	char *addr_mmap_s = mmap(NULL, pagesize, PROT_WRITE, MAP_SHARED, fd, 0);
+	unsigned long *addr_malloc = malloc(sizeof(unsigned long));
+
+	printf("addr_mmap_p: %p, addr_mmap_s: %p, addr_malloc: %p\n",
+			addr_mmap_p, addr_mmap_s, addr_malloc);
+
+	addr_mmap_p[pagesize - 1] = 0;
+	addr_mmap_s[pagesize - 1] = 0;
+	*addr_malloc = 0;
+	char c = getchar();
+
+	return 0;
+}