DOC PREVIEW
CMU CS 15213 - Exceptional Control Flow

This preview shows page 1-2-3-19-20-39-40-41 out of 41 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 41 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

Exceptional Control Flow Part II October 16, 2003ECF Exists at All Levels of a SystemThe World of MultitaskingProgrammer’s Model of MultitaskingUnix Process HierarchyThe ps commandThe ps Command (cont.)Unix Startup: Step 1Some PC Start-up DetailsUnix Startup: Step 2Unix Startup: Step 3Unix Startup: Step 4Shell ProgramsSimple Shell eval FunctionProblem with Simple Shell ExampleSignalsSignal ConceptsSignal Concepts (cont)Slide 19Signal ConceptsProcess GroupsSending Signals with kill ProgramSending Signals from the KeyboardExample of ctrl-c and ctrl-zSending Signals with kill FunctionReceiving SignalsDefault ActionsInstalling Signal HandlersSignal Handling ExampleSignal Handler FunkinessLiving With Nonqueuing SignalsSignal Handler Funkiness (Cont.)A Program That Reacts to Externally Generated Events (ctrl-c)A Program That Reacts to Internally Generated EventsNonlocal Jumps: setjmp/longjmpsetjmp/longjmp (cont)setjmp/longjmp ExamplePutting It All Together: A Program That Restarts Itself When ctrl-c’dLimitations of Nonlocal JumpsLimitations of Long Jumps (cont.)SummaryExceptional Control FlowPart IIOctober 16, 2003Exceptional Control FlowPart IIOctober 16, 2003TopicsTopicsProcess HierarchyShellsSignalsNonlocal jumpsclass16.ppt15-213“The course that gives CMU its Zip!”– 2 –15-213, F’03ECF Exists at All Levels of a SystemECF Exists at All Levels of a SystemExceptionsExceptionsHardware and operating system kernel softwareConcurrent processesConcurrent processesHardware timer and kernel softwareSignalsSignalsKernel softwareNon-local jumpsNon-local jumpsApplication codePrevious LectureThis Lecture– 3 –15-213, F’03The World of MultitaskingThe World of MultitaskingSystem Runs Many Processes ConcurrentlySystem Runs Many Processes ConcurrentlyProcess: executing programState consists of memory image + register values + program counterContinually switches from one process to anotherSuspend process when it needs I/O resource or timer event occursResume process when I/O available or given scheduling priorityAppears to user(s) as if all processes executing simultaneouslyEven though most systems can only execute one process at a timeExcept possibly with lower performance than if running alone– 4 –15-213, F’03Programmer’s Model of MultitaskingProgrammer’s Model of MultitaskingBasic FunctionsBasic Functionsfork() spawns new processCalled once, returns twiceexit() terminates own processCalled once, never returnsPuts it into “zombie” statuswait() and waitpid() wait for and reap terminated childrenexecl() and execve() run a new program in an existing processCalled once, (normally) never returnsProgramming ChallengeProgramming ChallengeUnderstanding the nonstandard semantics of the functionsAvoiding improper use of system resourcesE.g. “Fork bombs” can disable a system.– 5 –15-213, F’03Unix Process HierarchyUnix Process HierarchyLogin shellChildChildChildGrandchildGrandchild[0]Daemone.g. httpdinit [1]– 6 –15-213, F’03The ps commandThe ps commandUSER PID TTY STAT COMMANDUSER PID TTY STAT COMMANDroot 1 ? S init [3]root 1 ? S init [3]root 2 ? SW [keventd]root 2 ? SW [keventd]root 3 ? SWN [ksoftirqd_CPU0]root 3 ? SWN [ksoftirqd_CPU0]root 4 ? SW [kswapd]root 4 ? SW [kswapd]root 5 ? SW [bdflush]root 5 ? SW [bdflush]root 6 ? SW [kupdated]root 6 ? SW [kupdated]root 9 ? SW< [mdrecoveryd]root 9 ? SW< [mdrecoveryd]root 12 ? SW [scsi_eh_0]root 12 ? SW [scsi_eh_0]root 397 ? S /sbin/pump -i eth0root 397 ? S /sbin/pump -i eth0root 484 ? S< /usr/local/sbin/afsd -nosettimeroot 484 ? S< /usr/local/sbin/afsd -nosettimeroot 533 ? S syslogd -m 0root 533 ? S syslogd -m 0root 538 ? S klogd -2root 538 ? S klogd -2rpc 563 ? S portmaprpc 563 ? S portmaprpcuser 578 ? S rpc.statdrpcuser 578 ? S rpc.statddaemon 696 ? S /usr/sbin/atddaemon 696 ? S /usr/sbin/atdroot 713 ? S /usr/local/etc/nanny -init /etc/nanny.confroot 713 ? S /usr/local/etc/nanny -init /etc/nanny.confmmdf 721 ? S \_ /usr/local/etc/deliver -b -csmtpcmummdf 721 ? S \_ /usr/local/etc/deliver -b -csmtpcmuroot 732 ? S \_ /usr/local/sbin/named -froot 732 ? S \_ /usr/local/sbin/named -froot 738 ? S \_ /usr/local/sbin/sshd -Droot 738 ? S \_ /usr/local/sbin/sshd -Droot 739 ? S<L \_ /usr/local/etc/ntpd -nroot 739 ? S<L \_ /usr/local/etc/ntpd -nroot 752 ? S<L | \_ /usr/local/etc/ntpd -nroot 752 ? S<L | \_ /usr/local/etc/ntpd -nroot 753 ? S<L | \_ /usr/local/etc/ntpd -nroot 753 ? S<L | \_ /usr/local/etc/ntpd -nroot 744 ? S \_ /usr/local/sbin/zhm -n zephyr-1.srv.cmroot 744 ? S \_ /usr/local/sbin/zhm -n zephyr-1.srv.cmroot 774 ? S gpm -t ps/2 -m /dev/mouseroot 774 ? S gpm -t ps/2 -m /dev/mouseroot 786 ? S crondroot 786 ? S crondUnix> ps aux -w --forest(output edited to fit slide)– 7 –15-213, F’03The ps Command (cont.)The ps Command (cont.)USER PID TTY STAT COMMANDUSER PID TTY STAT COMMANDroot 889 tty1 S /bin/login -- agnroot 889 tty1 S /bin/login -- agnagn 900 tty1 S \_ xinit -- :0agn 900 tty1 S \_ xinit -- :0root 921 ? SL \_ /etc/X11/X -auth /usr1/agn/.Xauthority :0root 921 ? SL \_ /etc/X11/X -auth /usr1/agn/.Xauthority :0agn 948 tty1 S \_ /bin/sh /afs/cs.cmu.edu/user/agn/.xinitrcagn 948 tty1 S \_ /bin/sh /afs/cs.cmu.edu/user/agn/.xinitrcagn 958 tty1 S \_ xterm -geometry 80x45+1+1 -C -j -ls -nagn 958 tty1 S \_ xterm -geometry 80x45+1+1 -C -j -ls -nagn 966 pts/0 S | \_ -tcshagn 966 pts/0 S | \_ -tcshagn 1184 pts/0 S | \_ /usr/local/bin/wish8.0


View Full Document

CMU CS 15213 - Exceptional Control Flow

Documents in this Course
lecture

lecture

14 pages

lecture

lecture

46 pages

Caches

Caches

9 pages

lecture

lecture

39 pages

Lecture

Lecture

36 pages

Lecture

Lecture

45 pages

Lecture

Lecture

56 pages

lecture

lecture

11 pages

lecture

lecture

9 pages

Lecture

Lecture

36 pages

Lecture

Lecture

37 pages

Exam

Exam

16 pages

Lecture

Lecture

10 pages

Lecture

Lecture

43 pages

Lecture

Lecture

8 pages

Lecture

Lecture

8 pages

Lecture

Lecture

36 pages

Lecture

Lecture

43 pages

Lecture

Lecture

12 pages

Lecture

Lecture

37 pages

Lecture

Lecture

6 pages

Lecture

Lecture

40 pages

coding

coding

2 pages

Exam

Exam

17 pages

Exam

Exam

14 pages

Lecture

Lecture

29 pages

Lecture

Lecture

34 pages

Exam

Exam

11 pages

Lecture

Lecture

9 pages

Lecture

Lecture

37 pages

Lecture

Lecture

36 pages

lecture

lecture

46 pages

Lecture

Lecture

33 pages

Lecture

Lecture

57 pages

Lecture

Lecture

32 pages

Lecture

Lecture

46 pages

Lecture

Lecture

40 pages

Lecture

Lecture

11 pages

Lecture

Lecture

6 pages

Lecture

Lecture

43 pages

Lecture

Lecture

12 pages

Lecture

Lecture

18 pages

Exam

Exam

10 pages

Lecture

Lecture

45 pages

Lecture

Lecture

37 pages

Exam

Exam

24 pages

class09

class09

21 pages

class22

class22

37 pages

class20

class20

30 pages

class27

class27

33 pages

class25

class25

21 pages

class04

class04

31 pages

Lecture

Lecture

59 pages

class01a

class01a

14 pages

class12

class12

45 pages

class29

class29

33 pages

Lecture

Lecture

39 pages

Lecture

Lecture

6 pages

class03

class03

34 pages

lecture

lecture

42 pages

Lecture

Lecture

40 pages

Lecture

Lecture

47 pages

Exam

Exam

19 pages

R06-B

R06-B

25 pages

class17

class17

37 pages

class25

class25

31 pages

Lecture

Lecture

15 pages

final-f06

final-f06

17 pages

Lecture

Lecture

9 pages

lecture

lecture

9 pages

Exam

Exam

15 pages

Lecture

Lecture

22 pages

class11

class11

45 pages

lecture

lecture

50 pages

Linking

Linking

37 pages

Lecture

Lecture

64 pages

Integers

Integers

40 pages

Exam

Exam

11 pages

Lecture

Lecture

37 pages

Lecture

Lecture

44 pages

Lecture

Lecture

37 pages

Lecture

Lecture

9 pages

Lecture

Lecture

37 pages

Lecture

Lecture

45 pages

Final

Final

25 pages

lecture

lecture

9 pages

Lecture

Lecture

30 pages

Lecture

Lecture

16 pages

Final

Final

17 pages

Lecture

Lecture

8 pages

Exam

Exam

11 pages

Lecture

Lecture

47 pages

Lecture

Lecture

9 pages

lecture

lecture

39 pages

Exam

Exam

11 pages

lecture

lecture

41 pages

lecture

lecture

37 pages

Lecture

Lecture

59 pages

Lecture

Lecture

45 pages

Exam 1

Exam 1

18 pages

Lecture

Lecture

41 pages

Lecture

Lecture

32 pages

Lecture

Lecture

30 pages

Lecture

Lecture

9 pages

Lecture

Lecture

9 pages

Lecture

Lecture

15 pages

Lecture

Lecture

11 pages

Lecture

Lecture

9 pages

Lecture

Lecture

34 pages

Lecture

Lecture

40 pages

Lecture

Lecture

4 pages

Lecture

Lecture

46 pages

Lecture

Lecture

8 pages

Lecture

Lecture

65 pages

Lecture

Lecture

38 pages

Lecture

Lecture

35 pages

Lecture

Lecture

8 pages

Lecture

Lecture

34 pages

Lecture

Lecture

8 pages

Exam

Exam

13 pages

Lecture

Lecture

43 pages

Lecture

Lecture

9 pages

Lecture

Lecture

12 pages

Lecture

Lecture

9 pages

Lecture

Lecture

34 pages

Lecture

Lecture

43 pages

Lecture

Lecture

7 pages

Lecture

Lecture

45 pages

Lecture

Lecture

24 pages

Lecture

Lecture

47 pages

Lecture

Lecture

12 pages

Lecture

Lecture

20 pages

Lecture

Lecture

9 pages

Exam

Exam

11 pages

Lecture

Lecture

52 pages

Lecture

Lecture

20 pages

Exam

Exam

11 pages

Lecture

Lecture

35 pages

Lecture

Lecture

47 pages

Lecture

Lecture

18 pages

Lecture

Lecture

30 pages

Lecture

Lecture

59 pages

Lecture

Lecture

37 pages

Lecture

Lecture

22 pages

Lecture

Lecture

35 pages

Exam

Exam

23 pages

Lecture

Lecture

9 pages

Lecture

Lecture

22 pages

class12

class12

32 pages

Lecture

Lecture

8 pages

Lecture

Lecture

39 pages

Lecture

Lecture

44 pages

Lecture

Lecture

38 pages

Lecture

Lecture

69 pages

Lecture

Lecture

41 pages

Lecture

Lecture

12 pages

Lecture

Lecture

52 pages

Lecture

Lecture

59 pages

Lecture

Lecture

39 pages

Lecture

Lecture

83 pages

Lecture

Lecture

59 pages

class01b

class01b

17 pages

Exam

Exam

21 pages

class07

class07

47 pages

Lecture

Lecture

11 pages

Odyssey

Odyssey

18 pages

multicore

multicore

66 pages

Lecture

Lecture

6 pages

lecture

lecture

41 pages

lecture

lecture

55 pages

lecture

lecture

52 pages

lecture

lecture

33 pages

lecture

lecture

46 pages

lecture

lecture

55 pages

lecture

lecture

17 pages

lecture

lecture

49 pages

Exam

Exam

17 pages

lecture

lecture

56 pages

Exam 2

Exam 2

16 pages

Exam 2

Exam 2

16 pages

Notes

Notes

37 pages

Lecture

Lecture

40 pages

Lecture

Lecture

36 pages

Lecture

Lecture

43 pages

Lecture

Lecture

25 pages

Exam

Exam

13 pages

Lecture

Lecture

32 pages

Lecture

Lecture

12 pages

Lecture

Lecture

58 pages

Lecture

Lecture

29 pages

Lecture

Lecture

59 pages

Lecture

Lecture

41 pages

Lecture

Lecture

50 pages

Exam

Exam

17 pages

Lecture

Lecture

29 pages

Lecture

Lecture

44 pages

Lecture

Lecture

41 pages

Lecture

Lecture

52 pages

Lecture

Lecture

40 pages

Lecture

Lecture

33 pages

lecture

lecture

10 pages

Lecture

Lecture

27 pages

Lecture

Lecture

29 pages

Lecture

Lecture

39 pages

Lecture

Lecture

9 pages

Lecture

Lecture

29 pages

Lecture

Lecture

8 pages

Lecture

Lecture

43 pages

Lecture

Lecture

43 pages

Lecture

Lecture

75 pages

Lecture

Lecture

55 pages

Exam

Exam

12 pages

Lecture

Lecture

43 pages

Lecture

Lecture

35 pages

lecture

lecture

36 pages

Exam

Exam

33 pages

lecture

lecture

56 pages

lecture

lecture

64 pages

lecture

lecture

8 pages

Exam

Exam

14 pages

Lecture

Lecture

43 pages

Lecture

Lecture

36 pages

lecture

lecture

56 pages

lecture

lecture

75 pages

lecture

lecture

36 pages

Lecture

Lecture

50 pages

Lecture

Lecture

45 pages

Lecture

Lecture

13 pages

Exam

Exam

23 pages

Lecture

Lecture

10 pages

Lecture

Lecture

48 pages

Lecture

Lecture

83 pages

lecture

lecture

57 pages

Lecture

Lecture

33 pages

Lecture

Lecture

39 pages

Lecture

Lecture

33 pages

lecture

lecture

54 pages

Lecture

Lecture

30 pages

Exam

Exam

13 pages

Lecture

Lecture

36 pages

Lecture

Lecture

40 pages

Exam

Exam

17 pages

Lecture

Lecture

9 pages

Exam

Exam

15 pages

Lecture

Lecture

44 pages

Lecture

Lecture

34 pages

Lecture

Lecture

24 pages

Lecture

Lecture

29 pages

class12

class12

43 pages

lecture

lecture

43 pages

class22

class22

22 pages

R06-B

R06-B

25 pages

class01b

class01b

19 pages

lecture

lecture

29 pages

lab1

lab1

8 pages

Caches

Caches

36 pages

lecture

lecture

55 pages

Lecture,

Lecture,

37 pages

Integers

Integers

40 pages

Linking

Linking

38 pages

lecture

lecture

45 pages

Lecture

Lecture

61 pages

Linking

Linking

33 pages

lecture

lecture

40 pages

lecture

lecture

40 pages

Lecture

Lecture

32 pages

lecture

lecture

48 pages

lecture

lecture

44 pages

Exam

Exam

11 pages

Lecture

Lecture

31 pages

Lecture

Lecture

46 pages

Lecture

Lecture

40 pages

Lecture

Lecture

40 pages

Exam

Exam

12 pages

Lecture

Lecture

42 pages

Lecture

Lecture

36 pages

Lecture

Lecture

45 pages

Lecture

Lecture

41 pages

Lecture

Lecture

13 pages

Lecture

Lecture

35 pages

Lecture

Lecture

20 pages

Final

Final

19 pages

Lecture

Lecture

33 pages

Lecture

Lecture

50 pages

Lecture

Lecture

33 pages

Lecture

Lecture

27 pages

Lecture

Lecture

6 pages

Exam

Exam

15 pages

Lecture

Lecture

24 pages

Lecture

Lecture

23 pages

Lecture

Lecture

43 pages

Lecture

Lecture

32 pages

Lecture

Lecture

52 pages

Lecture

Lecture

37 pages

Lecture

Lecture

36 pages

Lecture

Lecture

34 pages

Lecture

Lecture

40 pages

Lecture

Lecture

15 pages

lecture

lecture

21 pages

Lecture

Lecture

58 pages

Lecture

Lecture

49 pages

Lecture

Lecture

36 pages

Lecture

Lecture

11 pages

Lecture

Lecture

12 pages

Lecture

Lecture

58 pages

Lecture

Lecture

33 pages

Exam

Exam

15 pages

Lecture

Lecture

35 pages

Lecture

Lecture

10 pages

Lecture

Lecture

25 pages

Lecture

Lecture

31 pages

Lecture

Lecture

24 pages

Lecture

Lecture

34 pages

Lecture

Lecture

50 pages

lecture

lecture

35 pages

Lecture

Lecture

11 pages

Lecture

Lecture

39 pages

Lecture

Lecture

45 pages

Lecture

Lecture

41 pages

exam1-f05

exam1-f05

11 pages

Lecture

Lecture

4 pages

Lecture

Lecture

17 pages

Exam

Exam

17 pages

malloc()

malloc()

12 pages

Lecture

Lecture

57 pages

Lecture

Lecture

30 pages

Lecture

Lecture

30 pages

Lecture

Lecture

47 pages

Lecture

Lecture

33 pages

Exam

Exam

12 pages

Lecture

Lecture

43 pages

Lectures

Lectures

33 pages

Lecture

Lecture

36 pages

lecture

lecture

33 pages

Exam

Exam

14 pages

Lecture

Lecture

43 pages

Lecture

Lecture

25 pages

Load more
Download Exceptional Control Flow
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Exceptional Control Flow and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Exceptional Control Flow 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?