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             int shmget(key,size,shmflg)
             key_t key;
             int size,shmflg;
        ˵Ã÷:±¾ÏµÍ³µ÷Ó÷µ»ØkeyÏà¹ØµÄ¹²ÏíÄÚ´æ±êʶ·û.
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               ÖµÎªÕæ.
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