Avvignmen| ƒĹ vmaѴѴvh ŐPouoѴio Avvignmen|ő Due NoY 3 b\ 11:59pm Points 180 Submitting a file Xpload File T\pes ]ip AYailable OcW 20 aW 8am - NoY 5 aW 11:59pm 17 Ga\V Sbmi| Avvignmen| In|uodcঞon In WhiV aVVignmenW \oX Zill ZUiWe smallsh \oXU oZn Vhell in C. VmallVh Zill implemenW a VXbVeW of feaWXUeV of Zell-knoZn VhellV, VXch aV baVh. YoXU pUogUam Zill 1. PUoYide a pUompW foU UXnning commandV 2. Handle blank lineV and commenWV, Zhich aUe lineV beginning ZiWh Whe # chaUacWeU 3. PUoYide e[panVion foU Whe YaUiable $$ 4. E[ecXWe 3 commandV e[iW , cd , and VWaWXV Yia code bXilW inWo Whe Vhell 5. E[ecXWe oWheU commandV b\ cUeaWing neZ pUoceVVeV XVing a fXncWion fUom Whe e[ec famil\ of fXncWionV 6. SXppoUW inpXW and oXWpXW UediUecWion 7. SXppoUW UXnning commandV in foUegUoXnd and backgUoXnd pUoceVVeV 8. ImplemenW cXVWom handleUV foU 2 VignalV, SIGINT and SIGTSTP Leauning O|comev AfWeU VXcceVVfXl compleWion of WhiV aVVignmenW, \oX VhoXld be able Wo do Whe folloZing DeVcUibe Whe Uni[ pUoceVV API (ModXle 4, MLO 2) WUiWe pUogUamV XVing Whe Uni[ pUoceVV API (ModXle 4, MLO 3) E[plain Whe concepW of VignalV and WheiU XVeV (ModXle 5, MLO 2) WUiWe pUogUamV XVing Whe Uni[ API foU Vignal handling (ModXle 5, MLO 3) E[plain I/O UediUecWion and ZUiWe pUogUamV WhaW can emplo\ I/O UediUecWion (ModXle 5, MLO 4) Puoguam FncঞonaѴi| Ɛĺ The Command Puomr| UVe Whe colon : V\mbol aV a pUompW foU each command line. The geneUal V\nWa[ of a command line iV: command [aUg1 aUg2 ...] [< inpXW_file] [> oXWpXW_file] [&] «ZheUe iWemV in VTXaUe bUackeWV aUe opWional. YoX can aVVXme WhaW a command iV made Xp of ZoUdV VepaUaWed b\ VpaceV. The Vpecial V\mbolV , and & aUe Uecogni]ed, bXW Whe\ mXVW be VXUUoXnded b\ VpaceV like oWheU ZoUdV. If Whe command iV Wo be e[ecXWed in Whe backgUoXnd, Whe laVW ZoUd mXVW be &. If Whe & chaUacWeU appeaUV an\ZheUe elVe, jXVW WUeaW iW aV noUmal We[W. If VWandaUd inpXW oU oXWpXW iV Wo be UediUecWed, Whe > oU < ZoUdV folloZed b\ a filename ZoUd mXVW appeaU afWeU all Whe aUgXmenWV. InpXW UediUecWion can appeaU befoUe oU afWeU oXWpXW UediUecWion. YoXU Vhell doeV noW need Wo VXppoUW an\ TXoWing; Vo aUgXmenWV ZiWh VpaceV inVide Whem aUe noW poVVible. We aUe alVo noW implemenWing Whe pipe "_" opeUaWoU. YoXU Vhell mXVW VXppoUW command lineV ZiWh a ma[imXm lengWh of 2048 chaUacWeUV, and a ma[imXm of 512 aUgXmenWV. YoX do noW need Wo do an\ eUUoU checking on Whe V\nWa[ of Whe command line. Ƒĺ Commen|v ş BѴank Linev YoXU Vhell VhoXld alloZ blank lineV and commenWV. An\ line WhaW beginV ZiWh Whe # chaUacWeU iV a commenW line and VhoXld be ignoUed. Mid-line commenWV, VXch aV Whe C-VW\le //, Zill noW be VXppoUWed. A blank line (one ZiWhoXW an\ commandV) VhoXld alVo do noWhing. YoXU Vhell VhoXld jXVW Ue-pUompW foU anoWheU command Zhen iW UeceiYeV eiWheU a blank line oU a commenW line. ƒĺ Eranvion of VauiabѴe ŪŪ YoXU pUogUam mXVW e[pand an\ inVWance of "$$" in a command inWo Whe pUoceVV ID of Whe VmallVh iWVelf. YoXU Vhell doeV noW oWheUZiVe peUfoUm YaUiable e[panVion. Ɠĺ BiѴ|Ŋin Commandv YoXU Vhell Zill VXppoUW WhUee bXilW-in commandV: e[iW , cd , and VWaWXV . TheVe WhUee bXilW-in commandV aUe Whe onl\ oneV WhaW \oXU Vhell Zill handle iWVelf - all oWheUV aUe Vimpl\ paVVed on Wo a membeU of Whe e[ec() famil\ of fXncWionV. YoX do noW haYe Wo VXppoUW inpXW/oXWpXW UediUecWion foU WheVe bXilW in commandV TheVe commandV do noW haYe Wo VeW an\ e[iW VWaWXV. If Whe XVeU WUieV Wo UXn one of WheVe bXilW-in commandV in Whe backgUoXnd ZiWh Whe & opWion, ignoUe WhaW opWion and UXn Whe command in Whe foUegUoXnd an\Za\ (i.e. don'W diVpla\ an eUUoU, jXVW UXn Whe command in Whe foUegUoXnd). ei| The e[iW command e[iWV \oXU Vhell. IW WakeV no aUgXmenWV. When WhiV command iV UXn, \oXU Vhell mXVW kill an\ oWheU pUoceVVeV oU jobV WhaW \oXU Vhell haV VWaUWed befoUe iW WeUminaWeV iWVelf. cd The cd command changeV Whe ZoUking diUecWoU\ of VmallVh. B\ iWVelf - ZiWh no aUgXmenWV - iW changeV Wo Whe diUecWoU\ Vpecified in Whe HOME enYiUonmenW YaUiable ThiV iV W\picall\ noW Whe locaWion ZheUe VmallVh ZaV e[ecXWed fUom, XnleVV \oXU Vhell e[ecXWable iV locaWed in Whe HOME diUecWoU\, in Zhich caVe WheVe aUe Whe Vame. ThiV command can alVo Wake one aUgXmenW: Whe paWh of a diUecWoU\ Wo change Wo. YoXU cd command VhoXld VXppoUW boWh abVolXWe and UelaWiYe paWhV. v|a|v The VWaWXV command pUinWV oXW eiWheU Whe e[iW VWaWXV oU Whe WeUminaWing Vignal of Whe laVW foUegUoXnd pUoceVV Uan b\ \oXU Vhell. If WhiV command iV UXn befoUe an\ foUegUoXnd command iV UXn, When iW VhoXld Vimpl\ UeWXUn Whe e[iW VWaWXV 0. The WhUee bXilW-in Vhell commandV do noW coXnW aV foUegUoXnd pUoceVVeV foU Whe pXUpoVeV of WhiV bXilW-in command - i.e., VWaWXV VhoXld ignoUe bXilW-in commandV. Ɣĺ Eecঞng O|heu Commandv YoXU Vhell Zill e[ecXWe an\ commandV oWheU Whan Whe 3 bXilW-in command b\ XVing foUk() , e[ec() and ZaiWpid() WheneYeU a non-bXilW in command iV UeceiYed, Whe paUenW (i.e., VmallVh) Zill foUk off a child. The child Zill XVe a fXncWion fUom Whe e[ec() famil\ of fXncWionV Wo UXn Whe command. YoXU Vhell VhoXld XVe Whe PATH YaUiable Wo look foU non-bXilW in commandV, and iW VhoXld alloZ Vhell VcUipWV Wo be e[ecXWed If a command failV becaXVe Whe Vhell coXld noW find Whe command Wo UXn, When Whe Vhell Zill pUinW an eUUoU meVVage and VeW Whe e[iW VWaWXV Wo 1 A child pUoceVV mXVW WeUminaWe afWeU UXnning a command (ZheWheU Whe command iV VXcceVVfXl oU iW failV). ѵĺ Inr| ş O|r| Rediuecঞon YoX mXVW do an\ inpXW and/oU oXWpXW UediUecWion XVing dXp2() . The UediUecWion mXVW be done befoUe XVing e[ec() Wo UXn Whe command. An inpXW file UediUecWed Yia VWdin VhoXld be opened foU Ueading onl\; if \oXU Vhell cannoW open Whe file foU Ueading, iW VhoXld pUinW an eUUoU meVVage and VeW Whe e[iW VWaWXV Wo 1 (bXW don'W e[iW Whe Vhell). SimilaUl\, an oXWpXW file UediUecWed Yia VWdoXW VhoXld be opened foU ZUiWing onl\; iW VhoXld be WUXncaWed if iW alUead\ e[iVWV oU cUeaWed if iW doeV noW e[iVW. If \oXU Vhell cannoW open Whe oXWpXW file iW VhoXld pUinW an eUUoU meVVage and VeW Whe e[iW VWaWXV Wo 1 (bXW don'W e[iW Whe Vhell). BoWh VWdin and VWdoXW foU a command can be UediUecWed aW Whe Vame Wime (Vee e[ample beloZ). ƕĺ Eecঞng Commandv in Foueguond ş Backguond Foueguond Commandv An\ command ZiWhoXW an & aW Whe end mXVW be UXn aV a foUegUoXnd command and Whe Vhell mXVW ZaiW foU Whe compleWion of Whe command befoUe pUompWing foU Whe ne[W command. FoU VXch commandV, Whe paUenW Vhell doeV NOT UeWXUn command line acceVV and conWUol Wo Whe XVeU XnWil Whe child WeUminaWeV. Backguond Commandv An\ non bXilW-in command ZiWh an & aW Whe end mXVW be UXn aV a backgUoXnd command and Whe Vhell mXVW noW ZaiW foU VXch a command Wo compleWe. FoU VXch commandV, Whe paUenW mXVW UeWXUn command line acceVV and conWUol Wo Whe XVeU immediaWel\ afWeU foUking off Whe child. The Vhell Zill pUinW Whe pUoceVV id of a backgUoXnd pUoceVV Zhen iW beginV. When a backgUoXnd pUoceVV WeUminaWeV, a meVVage VhoZing Whe pUoceVV id and e[iW VWaWXV Zill be pUinWed. ThiV meVVage mXVW be pUinWed jXVW befoUe Whe pUompW foU a neZ command iV diVpla\ed. If Whe XVeU doeVn'W UediUecW Whe VWandaUd inpXW foU a backgUoXnd command, When VWandaUd inpXW VhoXld be UediUecWed Wo /deY/nXll If Whe XVeU doeVn'W UediUecW Whe VWandaUd oXWpXW foU a backgUoXnd command, When VWandaUd oXWpXW VhoXld be UediUecWed Wo /deY/nXll Ѷĺ SignaѴv SIGINT ş SIGTSTP SIGINT A CTRL-C command fUom Whe ke\boaUd VendV a SIGINT Vignal Wo Whe paUenW pUoceVV and all childUen aW Whe Vame Wime (WhiV iV a bXilW-in paUW of LinX[). YoXU Vhell, i.e., Whe paUenW pUoceVV, mXVW ignoUe SIGINT An\ childUen UXnning aV backgUoXnd pUoceVVeV mXVW ignoUe SIGINT A child UXnning aV a foUegUoXnd pUoceVV mXVW WeUminaWe iWVelf Zhen iW UeceiYeV SIGINT The paUenW mXVW noW aWWempW Wo WeUminaWe Whe foUegUoXnd child pUoceVV; inVWead Whe foUegUoXnd child (if an\) mXVW WeUminaWe iWVelf on UeceipW of WhiV Vignal. If a child foUegUoXnd pUoceVV iV killed b\ a Vignal, Whe paUenW mXVW immediaWel\ pUinW oXW Whe nXmbeU of Whe Vignal WhaW killed iW'V foUegUoXnd child pUoceVV (Vee Whe e[ample) befoUe pUompWing Whe XVeU foU Whe ne[W command. SIGTSTP A CTRL-Z command fUom Whe ke\boaUd VendV a SIGTSTP Vignal Wo \oXU paUenW Vhell pUoceVV and all childUen aW Whe Vame Wime (WhiV iV a bXilW-in paUW of LinX[). A child, if an\, UXnning aV a foUegUoXnd pUoceVV mXVW ignoUe SIGTSTP. An\ childUen UXnning aV backgUoXnd pUoceVV mXVW ignoUe SIGTSTP. When Whe paUenW pUoceVV UXnning Whe Vhell UeceiYeV SIGTSTP The Vhell mXVW diVpla\ an infoUmaWiYe meVVage (Vee beloZ) immediaWel\ if iW'V ViWWing aW Whe pUompW, oU immediaWel\ afWeU an\ cXUUenWl\ UXnning foUegUoXnd pUoceVV haV WeUminaWed The Vhell When enWeUV a VWaWe ZheUe VXbVeTXenW commandV can no longeU be UXn in Whe backgUoXnd. In WhiV VWaWe, Whe & opeUaWoU VhoXld Vimpl\ be ignoUed, i.e., all VXch commandV aUe UXn aV if Whe\ ZeUe foUegUoXnd pUoceVVeV. If Whe XVeU VendV SIGTSTP again, When \oXU Vhell Zill DiVpla\ anoWheU infoUmaWiYe meVVage (Vee beloZ) immediaWel\ afWeU an\ cXUUenWl\ UXnning foUegUoXnd pUoceVV WeUminaWeV The Vhell When UeWXUnV back Wo Whe noUmal condiWion ZheUe Whe & opeUaWoU iV once again honoUed foU VXbVeTXenW commandV, alloZing Whem Wo be e[ecXWed in Whe backgUoXnd. See Whe e[ample beloZ foU XVage and Whe e[acW V\nWa[ Zhich \oX mXVW XVe foU WheVe WZo infoUmaWiYe meVVageV. SamrѴe Puoguam Eecঞon HeUe iV an e[ample UXn XVing VmallVh. NoWe WhaW CTRL-C haV no effecW WoZaUdV Whe boWWom of Whe e[ample, Zhen iW'V XVed Zhile ViWWing aW Whe command pUompW: $ VmallVh : lV jXnk VmallVh VmallVh.c : lV > jXnk : VWaWXV e[iW YalXe 0 : caW jXnk jXnk VmallVh VmallVh.c : Zc < jXnk > jXnk2 : Zc < jXnk 3 3 23 : WeVW -f badfile : VWaWXV e[iW YalXe 1 : Zc < badfile cannoW open badfile foU inpXW : VWaWXV e[iW YalXe 1 : badfile badfile: no VXch file oU diUecWoU\ : Vleep 5 ^CWeUminaWed b\ Vignal 2 : VWaWXV & WeUminaWed b\ Vignal 2 : Vleep 15 & backgUoXnd pid iV 4923 : pV PID TTY TIME CMD 4923 pWV/0 00:00:00 Vleep 4564 pWV/0 00:00:03 baVh 4867 pWV/0 00:01:32 VmallVh 4927 pWV/0 00:00:00 pV : : # WhaW ZaV a blank command line, WhiV iV a commenW line : backgUoXnd pid 4923 iV done: e[iW YalXe 0 : # Whe backgUoXnd Vleep finall\ finiVhed : Vleep 30 & backgUoXnd pid iV 4941 : kill -15 4941 backgUoXnd pid 4941 iV done: WeUminaWed b\ Vignal 15 : pZd /nfV/VWak/XVeUV/chaXdhUn/CS344/pUog3 : cd : pZd /nfV/VWak/XVeUV/chaXdhUn : cd CS344 : pZd /nfV/VWak/XVeUV/chaXdhUn/CS344 : echo 4867 4867 : echo $$ 4867 : ^C^Z EnWeUing foUegUoXnd-onl\ mode (& iV noZ ignoUed) : daWe Mon Jan 2 11:24:33 PST 2017 : Vleep 5 & : daWe Mon Jan 2 11:24:38 PST 2017 : ^Z E[iWing foUegUoXnd-onl\ mode : daWe Mon Jan 2 11:24:39 PST 2017 : Vleep 5 & backgUoXnd pid iV 4963 : daWe Mon Jan 2 11:24:39 PST 2017 : e[iW $ Hin|v ş Revoucev Ɛĺ The Command Puomr| Be VXUe \oX flXVh oXW Whe oXWpXW bXffeUV each Wime \oX pUinW, aV Whe We[W WhaW \oX'Ue oXWpXWWing ma\ noW Ueach Whe VcUeen XnWil \oX do in WhiV kind of inWeUacWiYe pUogUam. To do WhiV, call fflXVh() immediaWel\ afWeU each and eYeU\ Wime \oX oXWpXW We[W. ConVideU defining a VWUXcW in Zhich \oX can VWoUe all Whe diffeUenW elemenWV inclXded in a command. Then aV \oX paUVe a command, \oX can VeW Whe YalXe of membeUV of a YaUiable of WhiV VWUXcW W\pe. Ƒĺ Commen|v ş BѴank Linev ThiV VhoXld be Vimple. ƒĺ Eranvion of VauiabѴe ŪŪ HeUe aUe e[ampleV Wo illXVWUaWe Whe UeTXiUed behaYioU. SXppoVe Whe pUoceVV ID of VmallVh iV 179. Then The VWUing foo$$$$ in Whe command iV conYeUWed Wo foo179179 The VWUing foo$$$ in Whe command iV conYeUWed Wo foo179$ Ɠĺ BiѴ|Ŋin Commandv IW iV Uecommended WhaW \oX pUogUam Whe bXilW-in commandV fiUVW, befoUe Wackling Whe commandV WhaW UeTXiUe foUk() , e[ec() and ZaiWpid() . The bXilW-in commandV don'W VeW Whe YalXe of VWaWXV. ThiV meanV WhaW hoZeYeU \oX aUe keeping WUack of Whe VWaWXV, don'W change iW afWeU Whe e[ecXWion of a bXilW-in command. A pUoceVV can XVe chdiU() (https://man7.org/linux/man-pages/man2/chdir.2.html) Wo change iWV diUecWoU\. To WeVW Whe implemenWaWion of Whe cd command in VmallVh, don'W XVe geWenY("PWD") becaXVe iW Zill noW giYe \oX Whe coUUecW UeVXlW. InVWead, \oX can XVe Whe fXncWion geWcZd() (https://man7.org/linux/man- pages/man3/getcwd.3.html) . HeUe iV Zh\ geWenY("PWD") doeVn'W giYe \oX Whe coUUecW UeVXlW: PWD iV an enYiUonmenW YaUiable. AV diVcXVVed in ModXle 4, E[ploUaWion: EnYiUonmenW "When a paUenW pUoceVV foUkV a child pUoceVV, Whe child pUoceVV inheUiWV Whe enYiUonmenW of iWV paUenW pUoceVV." When \oX UXn VmallVh fUom a baVh Vhell, VmallVh inheUiWV Whe enYiUonmenW of WhiV baVh Vhell The YalXe of PWD in Whe baVh Vhell iV VeW Wo Whe diUecWoU\ in Zhich \oX aUe Zhen \oX UXn Whe command Wo VWaUW VmallVh VmallVh inheUiWV WhiV YalXe of PWD . When \oX change Whe diUecWoU\ in VmallVh, iW doeVn'W XpdaWe Whe YalXe of Whe enYiUonmenW YaUiable PWD Ɣĺ Eecঞng O|heu Commandv NoWe WhaW if e[ec() iV Wold Wo e[ecXWe VomeWhing WhaW iW cannoW do, like UXn a pUogUam WhaW doeVn'W e[iVW, iW Zill fail, and UeWXUn Whe UeaVon Zh\. In WhiV caVe, \oXU Vhell VhoXld indicaWe Wo Whe XVeU WhaW a command coXld noW be e[ecXWed (Zhich \oX knoZ becaXVe e[ec() UeWXUned an eUUoU), and VeW Whe YalXe UeWUieYed b\ Whe bXilW-in VWaWXV command Wo 1. Make VXUe WhaW Whe child pUoceVV WhaW haV had an e[ec() call fail WeUminaWeV iWVelf, oU elVe iW ofWen loopV back Xp Wo Whe Wop and WUieV Wo become a paUenW Vhell. ThiV iV eaV\ Wo VpoW: if Whe oXWpXW of Whe gUading VcUipW VeemV Wo be UepeaWing iWVelf, When \oX'Ye likel\ goW a child pUoceVV WhaW didn'W WeUminaWe afWeU a failed e[ec(). YoX can chooVe an\ fXncWion in Whe e[ec() famil\. HoZeYeU, Ze VXggeVW WhaW XVing eiWheU e[eclp() oU e[ecYp() Zill be VimpleVW becaXVe of Whe folloZing UeaVonV 1. VmallVh doeVn'W need Wo paVV a neZ enYiUonmenW Wo Whe pUogUam. So Whe addiWional fXncWionaliW\ pUoYided b\ Whe e[ec() fXncWionV ZiWh nameV ending in e iV noW UeTXiUed. 2. One e[ample of a command WhaW VmallVh needV Wo UXn iV lV (Whe gUadeUV Zill WU\ WhiV command aW Whe VWaUW of Whe WeVWing). RXnning WhiV command Zill be a loW eaVieU XVing Whe e[ec() fXncWionV WhaW VeaUch Whe PATH enYiUonmenW YaUiable. ѵĺ Inr| ş O|r| Rediuecঞon We Uecommend WhaW Whe needed inpXW/oXWpXW UediUecWion VhoXld be done in Whe child pUoceVV. NoWe WhaW afWeU XVing dXp2() Wo VeW Xp Whe UediUecWion, Whe UediUecWion V\mbol and UediUecWion deVWinaWion/VoXUce aUe NOT paVVed inWo Whe e[ec command FoU e[ample, if Whe command giYen iV lV > jXnk , When \oX handle Whe UediUecWion Wo "jXnk" ZiWh dXp2() and When Vimpl\ paVV lV inWo e[ec() . ƕĺ Eecঞng Commandv in Foueguond ş Backguond Foueguond Commandv FoU a foUegUoXnd command, iW iV Uecommend Wo haYe Whe paUenW Vimpl\ call ZaiWpid() on Whe child, Zhile iW ZaiWV. Backguond Commandv The Vhell VhoXld UeVpecW Whe inpXW and oXWpXW UediUecWion opeUaWoUV foU a command UegaUdleVV of ZheWheU Whe command iV Wo be UXn in Whe foUegUoXnd oU Whe backgUoXnd. ThiV meanV WhaW a backgUoXnd command VhoXld XVe /deY/nXll foU inpXW onl\ Zhen inpXW UediUecWion iV noW Vpecified in Whe command. SimilaUl\ a backgUoXnd command VhoXld XVe /deY/nXll foU oXWpXW onl\ Zhen oXWpXW UediUecWion iV noW Vpecified in Whe command. YoXU paUenW Vhell Zill need Wo peUiodicall\ check foU Whe backgUoXnd child pUoceVVeV Wo compleWe, Vo WhaW Whe\ can be cleaned Xp, aV Whe Vhell conWinXeV Wo UXn and pUoceVV commandV. ConVideU VWoUing Whe PIDV of non-compleWed backgUoXnd pUoceVVeV in an aUUa\. Then eYeU\ Wime BEFORE UeWXUning acceVV Wo Whe command line Wo Whe XVeU, \oX can check Whe VWaWXV of WheVe pUoceVVeV XVing ZaiWpid(...NOHANG...) . AlWeUnaWiYel\, \oX ma\ XVe a Vignal handleU Wo immediaWel\ ZaiW() foU child pUoceVVeV WhaW WeUminaWe, aV oppoVed Wo peUiodicall\ checking a liVW of VWaUWed backgUoXnd pUoceVVeV The Wime Wo pUinW oXW Zhen WheVe backgUoXnd pUoceVVeV haYe compleWed iV jXVW BEFORE command line acceVV and conWUol aUe UeWXUned Wo Whe XVeU, eYeU\ Wime WhaW happenV. Ѷĺ SignaѴv SIGINT ş SIGTSTP ReenWUanc\ iV impoUWanW Zhen Ze conVideU WhaW Vignal handleUV caXVe jXmpV in e[ecXWion WhaW caXVe pUoblemV ZiWh ceUWain fXncWionV. NoWe WhaW Whe pUinWf() famil\ of fXncWionV iV NOT UeenWUanW. In \oXU Vignal handleUV, Zhen oXWpXWWing We[W, \oX mXVW XVe oWheU oXWpXW fXncWionV! Wha| |o |un inĵ YoX can onl\ XVe C foU coding WhiV aVVignmenW and \oX mXVW XVe Whe gcc compileU. YoX can XVe C99 oU GNU99 VWandaUd oU Whe defaXlW VWandaUd XVed b\ Whe gcc inVWallaWion on oV1. YoXU aVVignmenW Zill be gUaded on oV1. SXbmiW a Vingle ]ip file ZiWh all \oXU code, Zhich can be in aV man\ diffeUenW fileV aV \oX ZanW. ThiV ]ip file mXVW be named \oXUonid_pUogUam3.]ip ZheUe \oXUonid VhoXld be Ueplaced b\ \oXU oZn ONID. E.g., if chaXdhUn ZaV VXbmiWWing Whe aVVignmenW, Whe file mXVW be named chaXdhUn_pUogUam3.]ip . In Whe ]ip file, \oX mXVW inclXde a We[W file called README.W[W WhaW conWainV inVWUXcWionV on hoZ Wo compile \oXU code XVing gcc Wo cUeaWe an e[ecXWable file WhaW mXVW be named VmallVh . YoXU ]ip file VhoXld noW conWain an\ e[WUaneoXV fileV. In paUWicXlaU, make VXUe noW Wo ]ip Xp Whe __MACOSX diUecWoUieV. When \oX UeVXbmiW a file in CanYaV, CanYaV can aWWach a VXffi[ Wo Whe file, e.g., Whe file name ma\ become chaXdhUn_pUogUam3-1.]ip . Don'W ZoUU\ aboXW WhiV name change aV no poinWV Zill be dedXcWed becaXVe of WhiV. Caঞon DXUing Whe deYelopmenW of WhiV pUogUam, Wake e[WUa caUe Wo onl\ do \oXU ZoUk on oV1, oXU claVV VeUYeU, aV \oXU VofWZaUe Zill likel\ negaWiYel\ impacW ZhaWeYeU machine iW UXnV on, eVpeciall\ befoUe iW iV finiVhed. If \oX caXVe WUoXble on one of Whe non-claVV, pXblic VeUYeUV, iW coXld hXUW \oXU gUade! If \oX aUe haYing WUoXble logging in Wo an\ of oXU EECS VeUYeUV becaXVe of UXnaZa\ pUoceVVeV, pleaVe XVe WhiV page Wo kill off an\ pUogUamV UXnning on \oXU accoXnW WhaW mighW be blocking \oXU acceVV: T.E.A.C.H. - The Engineering Accounts and Classes Homepage (https://teach.engr.oregonstate.edu/teach.php?t\pe=kill_runawa\_processes) Guading Cui|euia ThiV aVVignmenW iV ZoUWh 20% of \oXU gUade and WheUe aUe 180 poinWV aYailable foU iW. 170 poinWV aUe aYailable in Whe WeVW VcUipW, Zhile Whe final 10 poinWV Zill be baVed on \oXU VW\le, UeadabiliW\, and commenWing. CommenW Zell, ofWen, and YeUboVel\: Ze ZanW Wo Vee WhaW \oX aUe Welling XV WHY \oX aUe doing WhingV, in addiWion Wo Welling XV WHAT \oX aUe doing. Once Whe pUogUam iV compiled, accoUding Wo \oXU VpecificaWionV giYen in README.W[W, \oXU Vhell Zill be e[ecXWed Wo UXn a feZ Vample commandV againVW (lV, VWaWXV, e[iW, in WhaW oUdeU). If Whe pUogUam doeV noW VXcceVVfXll\ ZoUk on WhoVe commandV, iW Zill UeceiYe a ]eUo. If iW ZoUkV, When Whe gUading VcUipW Zill be UXn againVW iW (aV deWailed beloZ) foU final gUading. PoinWV Zill be aVVigned accoUding Wo Whe gUading VcUipW UXnning on oXU claVV VeUYeU onl\. Guading Me|hod HeUe iV Whe gUading VcUipW p3testscript. IW iV a baVh VcUipW WhaW VWaUWV Whe VmallVh pUogUam and UXnV commandV on VmallVh'V command line. MoVW of Whe commandV UXn b\ Whe gUading VcUipW aUe YeU\ VimilaU Wo Whe ToWal PoinWV: 180.0 Assignment 2 Rubric Criteria Ratings Pts 170.0 pWV 10.0 pWV commandV VhoZn in Whe VecWion Sample PUogUam E[ecXWion. YoX can open Whe VcUipW in a We[W ediWoU. The commenWV in Whe VcUipW Zill VhoZ \oX Whe poinWV foU indiYidXal iWemV. UVe Whe VcUipW Wo pUepaUe foU \oXU gUade, aV WhiV iV hoZ iW'V being eaUned. To UXn Whe VcUipW, place iW in Whe Vame diUecWoU\ aV \oXU compiled Vhell, chmod iW ( chmod +[ ./p3WeVWVcUipW ) and UXn WhiV command fUom a baVh pUompW: $ ./p3WeVWVcUipW 2>&1 oU $ ./p3WeVWVcUipW 2>&1 _ moUe oU $ ./p3WeVWVcUipW > m\WeVWUeVXlWV 2>&1 Do noW ZoUU\ if Whe Vpacing, indenWaWion, oU look of Whe oXWpXW of Whe VcUipW iV diffeUenW Whan Zhen \oX UXn iW inWeUacWiYel\: WhaW Zon¶W affecW \oXU gUade. The VcUipW ma\ add e[WUa colonV aW Whe beginning of lineV oU do oWheU ZeiUd WhingV, like pXW oXWpXW aboXW WeUminaWing pUoceVVeV fXUWheU doZn Whe VcUipW Whan \oX inWended. If \oXU pUogUam doeV noW ZoUk ZiWh Whe gUading VcUipW, and \oX inVWead UeTXeVW WhaW Ze gUade \oXU VcUipW b\ hand, Ze Zill appl\ a 15% UedXcWion Wo \oXU final VcoUe. So fUom Whe YeU\ beginning, make VXUe WhaW \oX ZoUk ZiWh Whe gUading VcUipW on oXU claVV VeUYeU! PoinWs from Whe WesW scripW 170.0 pts FXll Marks 0.0 pts No Marks The code is fXll\ commenWed 10.0 pts FXll Marks 0.0 pts No Marks
欢迎咨询51作业君
