update memory

src/Others/1.5.7_brk.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <unistd.h>
+void main() {
+        void *curr_brk, *tmp_brk, *pre_brk;
+
+        printf("当前进程 PID：%d\n", getpid());
+
+        tmp_brk = curr_brk = sbrk(0);
+        printf("初始化后的结束地址：%p\n", curr_brk);
+        getchar();
+
+        brk(curr_brk+4096);
+        curr_brk = sbrk(0);
+        printf("brk 之后的结束地址：%p\n", curr_brk);
+        getchar();
+        
+        pre_brk = sbrk(4096);
+        curr_brk = sbrk(0);
+        printf("sbrk 返回值（即之前的结束地址）：%p\n", pre_brk);
+        printf("sbrk 之后的结束地址：%p\n", curr_brk);
+        getchar();
+
+        brk(tmp_brk);
+        curr_brk = sbrk(0);
+        printf("恢复到初始化时的结束地址：%p\n", curr_brk);
+        getchar();
+}

src/Others/1.5.7_mmap.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <sys/mman.h>
+#include <unistd.h>
+void main() {
+        void *curr_brk;
+		
+        printf("当前进程 PID：%d\n", getpid());
+        printf("初始化后\n");
+        getchar();
+        
+        char *addr;
+        addr = mmap(NULL, (size_t)4096, PROT_READ|PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+        printf("mmap 完成\n");
+        getchar();
+
+        munmap(addr, (size_t)4096);
+        printf("munmap 完成\n");
+        getchar();
+}