shmop函数（共享内存）

• shmop_close()
• Closesharedmemoryblock

• shmop_delete()
• Deletesharedmemoryblock

• shmop_open()
• Createoropensharedmemoryblock

• shmop_read()
• Readdatafromsharedmemoryblock

• shmop_size()
• Getsizeofsharedmemoryblock

• shmop_write()
• Writedataintosharedmemoryblock