第七章将的malloc函数族，进程可以动态分配和释放内存。在讨论这些函数的实现时，描述了程序对已分配内存处理失当的种种情况，还点出了一些有助于定位此类错误根源的调试工具。
在课后练习中针对free_and_sbrk.c的修改如下：在每次malloc后，打印出program break堆顶的当前值。来验证malloc不会每次被调用时都调用sbrk()来调整program break的位置，而是周期性地分配大块内存。
root@ubuntu:~/tlpi-book/memalloc# ./free_and_sbrk 1000 1024 1 1 1000
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Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1361000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x1382000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Initial program break: 0x13a3000
Program break is now: 0x13a3000
Freeing blocks from 1 to 1000 in steps of 1
After free(), program break is: 0x12bc000
root@ubuntu:~/tlpi-book/memalloc#