OS：ubuntu 7.10
运行ipcs -m的时候，发现系统里好多的共享内存，但key都是0x00000000，大家也是这样的吗？
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 0 root 777 122880 2
0x00000000 1048577 rem1x 600 393216 2 dest
0x00000000 7798786 root 777 4096 2
0x00000000 229379 root 777 4096 2
0x00000000 262148 root 777 4096 2
0x00000000 294917 rem1x 600 393216 2 dest
0x00000000 327686 root 777 4096 2
0x00000000 360455 rem1x 600 393216 2 dest
0x00000000 393224 rem1x 600 393216 2 dest
0x00000000 425993 rem1x 600 393216 2 dest
0x00000000 458762 rem1x 600 393216 2 dest
0x00000000 491531 root 777 4096 2
0x00000000 524300 root 777 4096 2
0x00000000 557069 root 777 4096 2
0x00000000 589838 root 777 4096 2
0x00000000 622607 root 777 4096 2
0x00000000 655376 root 777 4096 2
0x00000000 688145 root 777 4096 2
0x00000000 720914 root 777 4096 2
0x00000000 753683 root 777 4096 2
0x00000000 786452 rem1x 600 393216 2 dest
0x00000000 819221 root 777 4096 2
0x00000000 851990 root 777 4096 2
0x00000000 884759 root 777 4096 2
0x00000000 917528 root 777 4096 2
0x00000000 950297 root 777 4096 2
0x00000000 983066 rem1x 600 393216 2 dest
0x00000000 1015835 rem1x 600 393216 2 dest
0x00000000 7995420 rem1x 666 235520 1 dest
0xcbc384f8 6946846 rem1x 660 64528 0
0x00000000 1212447 rem1x 600 393216 2 dest
0x00000000 1245216 rem1x 600 393216 2 dest
0x00000000 1376289 root 777 4096 2
0x00000000 1409058 root 777 4096 2
0x00000000 7962659 root 777 4096 2
0x00000000 2555940 root 777 4096 2
0x00000000 1638437 rem1x 600 393216 2 dest
0x00000000 1671206 rem1x 600 393216 2 dest
0x00000000 7667759 root 777 4096 2
0x00000000 2162736 root 777 4096 2
0x00000000 2424881 root 777 4096 2
0x00000000 2981938 rem1x 600 393216 2 dest
0x00000000 3014707 rem1x 600 12288 2 dest
0x00000000 7733300 root 777 4096 2
0x00000000 3047477 rem1x 600 393216 2 dest
0x00000000 3080246 rem1x 600 12288 2 dest
0x00000000 3113015 rem1x 600 393216 2 dest
0x00000000 3145784 rem1x 600 12288 2 dest
0x00000000 6586429 root 777 4096 2
