pclose without return???

[xuzhd]

My partner find a problem:When he executes the syscall pclose to close a
pipe, the system suspend without return. What is more, if his program
popens only one pipe, the pclose is executed successfully. If the program
popens two pipes, the pclose is executed without return.
-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
    许正华
    联想集团有限公司高性能服务器事业部
    直拨电话： 010 8287 5894
    传    真： 010 8287 6630 -- 32
    地    址：北京市海淀区上地创业路6号
    通信地址：北京市8688信箱    100085
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*