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CMU CS 15213 - lecture

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Slide 1ECF Exists at All Levels of a SystemTodayThe World of MultitaskingProgrammer’s Model of MultitaskingUnix Process HierarchyThe ps commandThe ps Command (cont.)Unix Startup: Step 1Some PC Start-up DetailsSome PC Start-up DetailsSome PC Start-up DetailsSome PC Start-up DetailsSome PC Start-up DetailsSome PC Start-up DetailsSome PC Start-up DetailsSome PC Start-up DetailsUnix Startup: Step 2Unix Startup: Step 3Unix Startup: Step 4Shell ProgramsSimple Shell eval FunctionWhat Is a “Background Job”?Problem with Simple Shell ExampleECF to the Rescue!TodaySignalsSending a SignalReceiving a SignalSignal Concepts (continued)Signal ConceptsProcess GroupsSending Signals with kill ProgramSending Signals with kill FunctionReceiving SignalsDefault ActionsInstalling Signal HandlersSignal Handling ExampleSignals Handlers as Concurrent FlowsAnother View of Signal Handlers as Concurrent FlowsTodayNonlocal Jumps: setjmp/longjmpsetjmp/longjmp (cont)setjmp/longjmp ExampleLimitations of Nonlocal JumpsLimitations of Long Jumps (cont.)Slide 47SummaryTodaySending Signals from the KeyboardExample of ctrl-c and ctrl-zSignal 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 EventsCarnegie MellonIntroduction to Computer Systems15-213, fall 200914th Lecture, Oct. 14thInstructors: Majd Sakr and Khaled HarrasCarnegie MellonECF Exists at All Levels of a SystemExceptionsHardware and operating system kernel softwareSignalsKernel softwareNon-local jumpsApplication codePrevious LectureThis LectureCarnegie MellonTodayMultitasking, shellsSignalsLong jumpsMore on signalsCarnegie MellonThe World of MultitaskingSystem runs many processes concurrentlyProcess: executing programState includes memory image + register values + program counterRegularly 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 aloneCarnegie MellonProgrammer’s Model of MultitaskingBasic 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 new program in existing processCalled once, (normally) never returnsProgramming challengeUnderstanding the nonstandard semantics of the functionsAvoiding improper use of system resourcesE.g. “Fork bombs” can disable a systemCarnegie MellonUnix Process HierarchyLogin shellChildChildChildGrandchildGrandchild[0]Daemone.g. httpdinit [1]Carnegie MellonThe ps commandUSER PID TTY STAT COMMANDroot 1 ? S init [3]root 2 ? SW [keventd]root 3 ? SWN [ksoftirqd_CPU0]root 4 ? SW [kswapd]root 5 ? SW [bdflush]root 6 ? SW [kupdated]root 9 ? SW< [mdrecoveryd]root 12 ? SW [scsi_eh_0]root 397 ? S /sbin/pump -i eth0root 484 ? S< /usr/local/sbin/afsd -nosettimeroot 533 ? S syslogd -m 0root 538 ? S klogd -2rpc 563 ? S portmaprpcuser 578 ? S rpc.statddaemon 696 ? S /usr/sbin/atdroot 713 ? S /usr/local/etc/nanny -init /etc/nanny.confmmdf 721 ? S \_ /usr/local/etc/deliver -b -csmtpcmuroot 732 ? S \_ /usr/local/sbin/named -froot 738 ? S \_ /usr/local/sbin/sshd -Droot 739 ? S<L \_ /usr/local/etc/ntpd -nroot 752 ? S<L | \_ /usr/local/etc/ntpd -nroot 753 ? S<L | \_ /usr/local/etc/ntpd -nroot 744 ? S \_ /usr/local/sbin/zhm -n zephyr-1.srv.cmroot 774 ? S gpm -t ps/2 -m /dev/mouseroot 786 ? S crondUnix> ps aux -w --forest(output edited to fit slide)Carnegie MellonUSER PID TTY STAT COMMANDroot 889 tty1 S /bin/login -- agnagn 900 tty1 S \_ xinit -- :0root 921 ? SL \_ /etc/X11/X -auth /usr1/agn/.Xauthority :0agn 948 tty1 S \_ /bin/sh /afs/cs.cmu.edu/user/agn/.xinitrcagn 958 tty1 S \_ xterm -geometry 80x45+1+1 -C -j -ls -nagn 966 pts/0 S | \_ -tcshagn 1184 pts/0 S | \_ /usr/local/bin/wish8.0 -f /usragn 1212 pts/0 S | | \_ /usr/local/bin/wish8.0 -f agn 3346 pts/0 S | | \_ aspell -a -Sagn 1191 pts/0 S | \_ /bin/sh /usr/local/libexec/mozagn 1204 8 pts/0 S | \_ /usr/local/libexec/mozillaagn 1207 8 pts/0 S | \_ /usr/local/libexec/mozagn 1208 8 pts/0 S | | \_ /usr/local/libexecagn 1209 8 pts/0 S | | \_ /usr/local/libexecagn 17814 8 pts/0 S | | \_ /usr/local/libexecagn 2469 pts/0 S | \_ usr/local/lib/Acrobatagn 2483 pts/0 S | \_ java_vmagn 2484 pts/0 S | \_ java_vmagn 2485 pts/0 S | \_ java_vmagn 3042 pts/0 S | \_ java_vmagn 959 tty1 S \_ /bin/sh /usr/local/libexec/kde/bin/staagn 1020 tty1 S \_ kwrapper ksmserverThe ps Command (cont.)Carnegie MellonUnix Startup: Step 1init [1][0]Process 0: handcrafted kernel processChild process 1 execs /sbin/init1. Pushing reset button loads the PC with the address of a small bootstrap program.2. Bootstrap program loads the boot block (disk block 0).3. Boot block program loads kernel binary (e.g., /boot/vmlinux)4. Boot block program passes control to kernel.5. Kernel handcrafts the data structures for process 0.Process 0


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