多进程编程[4]

                     printf("%s\n",str);
             }
             pclose(fd);
    6.wait()
        功能:等待一个子进程返回并修改状态
        语法:#include <sys/types.h>
             #include <sys/wait.h>
             pid_t wait(stat_loc)
             int *stat_loc;
        说明:允许调用进程取得子进程的状态信息.调用进程将会挂起直到其