linu多进程程序设计

1、实验报告实验名称：Linux多进程程序设计实验目的熟悉Linux下多进程编程的方法，掌握Linux下fork、exec、wait、waitpid等进程相关的系统调用使用方法。二、实验内容在父进程中创建两个子进程，其中一个子进程运行“Is -I ”指令，另一个子进程在暂停5s之后退出。父进程先用阻塞方式等待第一个子进程的结束，然后用非阻塞方式等待第二个子 进程的退出，待收集到第二个子进程结束的信息，父进程就返回。三、实验内容1、程序说明、流程图等父进程首先创建一个子进程 A,采用组赛模式等待进程 A结束，然后创建进程B,采用非阻塞模式等待B进程结束，然后父进程结束A进程运行ps -efB进程等待

2、5S自动结束父进程会铺货进程A, B的结束，然后给予相应的提示。if(pa=O)else迪程阻塞”於Aif(pb=O)else父进程r非阻塞等待B2、程序代码#i nclude #include #include #include #include int mai n(void )pid_t pa,pb,pr;pa=fork();if(pa0)perror(fork a error!);else if(pa=O)sleep(1);prin tf(process A is runningn ”)；if(execlp(ps,ps,-ef,NULL)O) perror(execlp a error!

3、); exit(0);elseprin tf(this is pare nt process!n);prin tf(pare nt process is wati ng for childre n !n ”);prin tf(wati ngwatingn ”)；pr=wait(NULL);if(pr=pa)prin tf(pare nt catched the child A!n);prin tf(creat process B!n);pb=fork();if(pb0)prin tf(error fork Bn);else if(pb=0)prin tf(B process is runnin

4、g( 5 S )!n); sleep(5);prin tf(B process en d!n);exit(0);elsedopr=waitpid(pb,NULL,WNOHANG);if(pr=0)/*B not en d*/prin tf(father is wat ing for child B!n); sleep(1);while(pr=O);/*wait for process B*/ if(pr=pb)prin tf(child B very well!n);elseprin tf(my child B lost!);3、运行测试输出的结果haohao-VirtualBox1-/Des

5、ktop* gcc -o test test,c hao(ahao-VirtualBox: -/Desktops /test this is parent process!parent process is 属ting for children ! wating . 厢tingprocess A is runninghoo2029hao2685hao2086parent catched26150G3:472626603:492385303:49the child A!ptS/G ptS/G pts/e06:GG:Ou bash 00:08:90 ./test oe：ee：o0 ps -efHI

6、DPIDPPIDcSTI HETTYTIMECMDroot1&002:57?朋:ee：:ei/sbin/initroot20062;：57?ee：ee：:06kthreaddroot32e02:57?盹:：ee：eeksoftirqd/6root52e02:57?es：kworker/u：Qroot6202：:57?ee：:ee：:前jmigration/Groot72002：57?胭:朋:661cpusetlroot82e02:57?ee：ee：ee1khelperlroot92062157?eo：eo：:前netnsrootIB202：57?盹:昭:00sync supersroot112

7、&02:57?ee：ee：eebdi-defaultroot122G0257?ee；ee；前kintegritydroot132002:57?跑盹:QDkblockdroot142G02:57ee：ee：:eelucpidroot1520257?ee：阳:；eekacpi notifyl厂EC卄i aam -_2 ae KrftlJT Efn/-ini iihc + riill im 1treat process B!father is wating for child B!B process is running! 5 S )*B! B! B! B!father is wating far

8、child father is wating tor child father is wating for child father is wating for child B process end!child B very well!this is pare nt process!pare nt process is wati ng for childre n !wati ng .watingprocess A is running.UIDPIDPPID C STIME TTYTIME CMDroot10 0 02:57 ?00:00:01 /sbi n/in itroot20 0 02:

9、57 ?00:00:00 kthreaddroot320 02:57 ?00:00:00 ksoftirqd/0root520 02:57 ?00:00:00 kworker/u:0root620 02:57 ?00:00:00 migratio n/0root720 02:57 ?00:00:00 cpusetroot820 02:57 ?00:00:00 khelperroot920 02:57 ?00:00:00 n et nsroot1020 02:57 ?00:00:00 sy nc_supersroot1120 02:57 ?00:00:00 bdi-defaultroot1220

10、 02:57 ?00:00:00 ki ntegritydroot1320 02:57 ?00:00:00 kblockdroot1420 02:57 ?00:00:00 kacpidroot1520 02:57 ?00:00:00 kacpi_ notifyroot1620 02:57 ?00:00:00 kacpi_hotplugroot1720 02:57 ?00:00:00 ata_sffroot1820 02:57 ?00:00:00 khubdroot1920 02:57 ?00:00:00 mdroot2220 02:57 ?00:00:00 khu ngtaskdroot232

11、0 02:57 ?00:00:00 kswapd0root2420 02:57 ?00:00:00 ksmdroot2520 02:57 ?00:00:00 fsn otify_markroot2620 02:57 ?00:00:00 aioroot2720 02:57 ?00:00:00 ecryptfs-kthrearoot2820 02:57 ?00:00:00 cryptoroot3220 02:57 ?00:00:00 kthrotldroot3420 02:57 ?00:00:00 scsi_eh_0root3520 02:57 ?00:00:01 scsi_eh_1root362

12、0 02:57 ?00:00:00 kworker/u:3root3920 02:57 ?00:00:00 kmpathdroot4020 02:57 ?00:00:00 kmpath_ha ndlerdroot4120 02:57 ?00:00:00 ko ndema ndroot4220 02:57 ?00:00:00 kco nservativeroot16020 02:57 ?00:00:00 scsi_eh_2root17620 02:57 ?00:00:00 jbd2/sda1-8root17720 02:57 ?00:00:00 ext4-dio-u nwritroot22410

13、 02:57 ?00:00:00 upstart-udev-bridge -daem onroot23510 02:57 ?00:00:00 udevd -daemonsyslog32910 02:57 ?00:00:00 rsyslogd -c410233410 02:57 ?00:00:00 dbus-daem on -system -fork -avahi36110 02:57 ?00:00:00 avahi-daem on: running hao-Viravahi3623610 02:57 ?00:00:00 avahi-daem on: chroot helperroot37510

14、 02:57 ?00:00:00 NetworkMa nagerroot38310 02:57 ?00:00:00 /usr/sb in/modem-ma nagerroot39210 02:57 ?00:00:00 /usr/lib/policykit-1/polkitdroot43710 02:57 ?00:00:00 /sbin/wpa_supplica nt -u -sroot44520 02:57 ?00:00:00 kpsmousedroot50620 02:57 ?00:00:00 iprtroot52610 02:57 ?00:00:00 upstart-socket-brid

15、ge -daem onroot60610 02:57 tty400:00:00 /sbin /getty -8 38400 tty4root61410 02:57 tty500:00:00 /sbin /getty -8 38400 tty5root62610 02:57 tty200:00:00 /sbin /getty -8 38400 tty2root63310 02:57 tty300:00:00 /sbin /getty -8 38400 tty3root63610 02:57 tty600:00:00 /sbin /getty -8 38400 tty6daem on64310 0

16、2:57 ?00:00:00 atdroot64410 02:57 ?00:00:00 acpid -c /etc/acpi/eve nts -s /root64510 02:57 ?00:00:00 cronroot66420 02:57 ?00:00:00 flush-8:0root74610 02:57 ?00:00:02 /usr/sbi n/VBoxServiceroot90510 02:57 ?00:00:00 gdm-bi naryroot90810 02:57 ?00:00:00 /usr/sb in/cupsd -Froot91010 02:57 tty100:00:00 /

17、sbin /getty -8 38400 tty1root91410 02:57 ?00:00:00 /usr/sb in/co nsole-kit-daemon -root9809050 02:57 ?00:00:00 /usr/lib/gdm/gdm-simple-slaveroot9859802 02:57 tty700:01:28 /usr/bi n/X :0 -nr -verbose -auroot10009800 02:57 ?00:00:00 /usr/lib/gdm/gdm-sessi on-workehao100910000 02:57 ?00:00:00 gno me-se

18、ssi on -sessi on=ubuntuhao105210 02:57 ?00:00:00 /usr/bi n/VBoxClie nt -clipboarhao106410 02:57 ?00:00:00 /usr/bi n/VBoxClie nt -displayhao107010 02:57 ?00:00:00 /usr/bi n/VBoxClie nt -seamlesshao107610 02:57 ?00:00:30 /usr/bi n/VBoxClie nt -draga nddhao107910090 02:57 ?00:00:00 /usr/bi n/ssh-age nt

19、 /usr/bi n/dbhao108210 02:57 ?00:00:00 /usr/bi n/dbus-lau nch -exit-wihao108310 02:57 ?00:00:01 /bi n/dbus-daemon -fork -prihao108810 02:57 ?00:00:00 /usr/lib/libgco nf2-4/gco nfd-2hao110110 02:57 ?00:00:00 /usr/b in/gno me-keyri ng-daem onhao110610 02:57 ?00:00:04 /usr/lib/g no me-sett in gs-daem o

20、nhao110910 02:57 ?00:00:00 /usr/lib/gvfs/gvfsdhao111410090 02:57 ?00:00:05 metacityhao111610 02:57 ?00:00:00 /usr/lib/gvfs/gvfs-fuse-daemohao112010 02:57 ?00:00:04 /usr/bi n/pulseaudio -start -rtkit112210 02:57 ?00:00:00 /usr/lib/rtkit/rtkit-daem onhao112710090 02:57 ?00:00:10 nautilushao112810090 0

21、2:57 ?00:00:00 /usr/lib/evolutio n/2.32/evoluthao113110090 02:57 ?00:00:04 gno me-pa nelhao113510090 02:57 ?00:00:00 zeitgeist-datahubhao113711200 02:57 ?00:00:00 /usr/lib/pulseaudio/pulse/gc onhao113810090 02:57 ?00:00:00 nm-applet -sm-disablehao114010090 02:57 ?00:00:00 gno me-power-ma nagerhao114

22、210090 02:57 ?00:00:00 /usr/lib/policykit-1-g nome/polhao114310090 02:57 ?00:00:00 bluetooth-applethao115210 02:57 ?00:00:00 /usr/lib/gvfs/gvfs-gdu-volume-root115610 02:57 ?00:00:00 /usr/lib/udisks/udisks-daem onroot115811560 02:57 ?00:00:01 udisks-daem on: polli ng /dev/srhao116010 02:57 ?00:00:01

23、/usr/bi n/pytho n /usr/bi n/zeitghao116310 02:57 ?00:00:00 /usr/lib/gvfs/gvfs-afc-volume-hao116710 02:57 ?00:00:00 /usr/lib/gvfs/gvfs-gphoto2-volhao117111600 02:57 ?00:00:00 /bi n/cathao117611600 02:57 ?00:00:00 zeitgeist-datah root119510 02:57 ?00:00:00 /usr/lib/upower/upowerdhao126310 02:57 ?00:00

24、:00 /usr/lib/gvfs/gvfsd-trash -sphao126510 02:57 ?00:00:00 gno me-scree nsaverhao127210 02:57 ?00:00:02 /usr/lib/notify-osd/notify-osdhao129010 02:57 ?00:00:00 /usr/lib/bo nobo-activatio n/bonhao130310 02:57 ?00:00:03 /usr/lib/g nome-pa nel/w nck-applhao130510 02:57 ?00:00:00 /usr/lib/g no me-applet

25、s/trash aphao131110 02:57 ?00:00:00 /usr/lib/g nome-pa nel/notificathao131210 02:57 ?00:00:01 /usr/lib/i ndicator-applet/i ndihao132710090 02:57 ?00:00:00 /usr/lib/g no me-disk-utility/gdhao133010 02:57 ?00:00:00 /usr/lib/gvfs/gvfsd-burn -spahao133910 02:57 ?00:00:00 /usr/lib/gvfs/gvfsd-metadatahao1

26、34310 02:57 ?00:00:00 /usr/lib/d-co nf/dcon f-servicehao134710 02:57 ?00:00:00 /usr/lib/i ndicator-messages/i nhao134910 02:57 ?00:00:00 /usr/lib/i ndicator-sou nd/i ndichao135110 02:57 ?00:00:00 /usr/lib/i ndicator-applicatio nhao135310 02:57 ?00:00:00 /usr/lib/i ndicator-sessio n/indhao135610 02:57 ?00:00:00 /usr/lib/i ndicator-datetime/i nhao135710 02:57 ?00:00:00 /usr/lib/i ndicator-me/i ndicatohao139710 02:57 ?00:00:00 /usr/lib/geoclue/geoclue-mastehao139910090 02:57 ?00:00:00 /usr/bi n/pytho n /u