兰州大学操作系统实验期末考试试题答案

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1、1：#includemain(){intpl,p2;while((pl=fork())==-l);if(pl==O)execl(7bin/ps,,/,,ps,,；,-af,,,(char*)0);else{execl(7bin/ls"/,,ls"/7home/stu,,/(char*)0);}}1-c:在函数'main'中：l-c:7:4:警告：隐式声明与内建函数'execl'不兼容［默认启用］user@ubuntu:~$>/1Is:无法访问/home/stu:没有那个文件或目录user@ubuntu:〜$UIDPIDP

2、PIDCSTIMETTYTIMECMDuser37571020:26pts/200:00:00ps-afuser@ubuntu:-$02：#inelude#include#inelude#include#include#include#include#includeintpidl,pid2;main()intfd[3];charOutPipe[100]JnPipe[100];pipe

3、(fd);while((pidl=fork())==-l);if(pidl==0){printf("pl");lockf(fd[l],l,0);sprintf(OutPipe,"Child1processissendingmessage!");write(fd[l],OutPipe,50);sleep(l);lockf(fd[l],0,0);exit(EXIT_SUCCESS);}else{while((pid2=fork())==-l);if(pid2==0){printf("p2");lockf(fd[l],l,0);spri

4、ntf(OutPipe,"Child2processissendingmessage!");write(fd[l],OutPipe,50);sleep(l);lockf(fd[l]z0,0);}else{printf(Hparent");wait(0);read(fd[O],InPipe,50);printf(”％s”,InPipe);wait(0);read(fd[0]JnPipe,50);printf("%s”,InPipe);exit(EXIT_SUCCESS);}}}user@ubuntu:*$gedtt3.cuser

5、@ubuntu:*$gcc3.c・o3user@ubuntu:*$./3parentChild1processissendingmessage!Child2processissendtngmessage!user@ubuntu:*$

6、