Finally, in Figure 4, processes a and B can read and write from the Shared memory segment freely.
最后，在图4中，进程a和B可以随意读写共享内存段。
Shmat failed because of 0x000000c, which is ENOMEM or the available data space is not large enough to accommodate the Shared memory segment.
shmat失败于0x000000c，即ENOMEM或可用数据空间不足以容纳共享内存段。
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