{"id":31229,"date":"2019-10-31T21:40:10","date_gmt":"2019-10-31T18:40:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/operating-systems-three-easy-pieces-part-3-process-api-perevod\/"},"modified":"2019-10-31T21:40:10","modified_gmt":"2019-10-31T18:40:10","slug":"operating-systems-three-easy-pieces-part-3-process-api-perevod","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/operating-systems-three-easy-pieces-part-3-process-api-perevod","title":{"rendered":"Operating Systems: Three Easy Pieces. Part 3: Process API (t\u00f5lge)","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h1>Sissejuhatus operatsioonis\u00fcsteemidesse<\/h1>\n<p>\nTere, Habr! Soovin tutvustada teile artiklite seeriat, mis on t\u00f5lkinud minu arvates huvitavat kirjandust \u2014 OSTEP. Selles materjalis k\u00e4sitletakse s\u00fcgavalt unix-sarnaste operatsioonis\u00fcsteemide toimimist, sealhulgas protsesside, erinevate planeerijate, m\u00e4luhalduse ja muude sarnaste komponentide t\u00f6\u00f6tamise aspekte, mis moodustavad t\u00e4nap\u00e4eva operatsioonis\u00fcsteemi. Originaali k\u00f5iki materjale saate vaadata siit: <noindex><a rel=\"nofollow\" href=\"http:\/\/pages.cs.wisc.edu\/~remzi\/OSTEP\/\">siin<\/a><\/noindex>. Palun arvestage, et t\u00f5lge on tehtud mitteprofessionaalselt (piisavalt vabalt), kuid loodan, et olen p\u00f5hisisu s\u00e4ilitanud.<\/p>\n<p>Laborit\u00f6\u00f6d selle aine kohta leiate siit:<\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/pages.cs.wisc.edu\/~remzi\/OSTEP\/Homework\/homework.html\">originaal<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/remzi-arpacidusseau\/ostep-code\">originaal<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/bykvaadm\/OS\/tree\/master\/ostep\">minu isiklik kohandamine<\/a><\/noindex><\/li>\n<\/ul>\n<p>\nTeised osad:<\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/post\/446340\/\">Osa 1: Sissejuhatus<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/post\/446866\/\">Osa 2: Abstraktsioon: protsess<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/en\/post\/447182\/\">Osa 3: Sissejuhatus protsesside API-sse<\/a><\/noindex><\/li>\n<\/ul>\n<p>\nLisaks v\u00f5ite minna minu kanalile <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/bykvaadm\">Telegraam<\/a><\/noindex> =)<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b>H\u00e4ire!<\/b> selle loenguga on labor! vaata <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/bykvaadm\/OS\/tree\/master\/ostep\">github<\/a><\/noindex><\/p>\n<h2>Protsessi API<\/h2>\n<p>Vaadake n\u00e4idet protsessi loomisest UNIX s\u00fcsteemis. See toimub kahe s\u00fcsteemi k\u00f5ne kaudu <b>fork()<\/b> ja <b>exec()<\/b>.<\/p>\n<h3>Kutse fork()<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Operating Systems: Three Easy Pieces. Part 3: Process API (t\u00f5lge)\" src=\"\/wp-content\/uploads\/2019\/04\/c0c39726560e18a82ae05a31b43f92c0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVaadake programmi, mis kutsub esile fork(). Selle t\u00e4itmise tulemus on j\u00e4rgmine.<\/p>\n<p><img decoding=\"async\" alt=\"Operating Systems: Three Easy Pieces. Part 3: Process API (t\u00f5lge)\" src=\"\/wp-content\/uploads\/2019\/04\/3ddddbaf5bbb38e9882827da0513805a.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEsiteks siseneme funktsiooni main() ja v\u00e4lja kirjutame rea ekraanile. Rida sisaldab protsessi identifikaatorit, mida algselt nimetatakse <b>PID<\/b> v\u00f5i protsessi identifikaator. See identifikaator kasutatakse UNIXis, et viidata protsessile. J\u00e4rgmise k\u00e4suga kutsub k\u00e4ivituma funktsioon fork(). Sel hetkel luuakse praktiliselt t\u00e4pne koopia protsessist. Operatsioonis\u00fcsteemi jaoks n\u00e4eb see v\u00e4lja nii, et s\u00fcsteemis on nagu kaks koopia sama programmiga, mis l\u00f5petavad fork() funktsioonist v\u00e4ljumise. Uuesti loodud protsess-lapse (seoses selle loonud protsess-vanemaga) ei hakka enam t\u00f6\u00f6tama alates funktsioonist main(). Tuleb meeles pidada, et protsess-laps ei ole protsess-vanema t\u00e4pne koopia, eelk\u00f5ige on tal oma aadressiruum, oma registrid, oma n\u00e4idud t\u00e4idetavate juhiste jaoks ja nii edasi. Seega tagastatav v\u00e4\u00e4rtus funktsiooni fork() kutse korral on erinev. Eelk\u00f5ige saab protsess-vanem tagastuseks protsessi lapse PID v\u00e4\u00e4rtuse, samas kui laps saab v\u00e4\u00e4rtuse, mis on v\u00f5rdne 0. Nende tagastuskoodide alusel saab hiljem juba eristada protsesse ja sundida iga\u00fcht nende t\u00f6\u00f6d tegema. Siiski ei ole selle programmi t\u00e4itmine rangelt m\u00e4\u00e4ratletud. P\u00e4rast kaheks jagunemist j\u00e4lgib OS neid ja kavandab nende t\u00f6\u00f6d. \u00dches\u00fcdamiku protsessori korral j\u00e4tkab t\u00f6\u00f6 \u00fchel protsessil, antud juhul - vanemal, ja seej\u00e4rel saab juhtimise protsess-laps. Uue k\u00e4ivitamise korral v\u00f5ib olukord olla erinev.<\/p>\n<h3>Wait() kutse<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Operating Systems: Three Easy Pieces. Part 3: Process API (t\u00f5lge)\" src=\"\/wp-content\/uploads\/2019\/04\/abb10671424f1889fbbb3facae739029.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVaatame j\u00e4rgmist programmi. Selle programmi puhul, t\u00e4nu kutse olemasolule <b>wait()<\/b> vanemprotsess ootab alati j\u00e4rglase protsessi l\u00f5petamist. Sel juhul saame t\u00e4pselt m\u00e4\u00e4ratletud v\u00e4ljundi ekraanile<\/p>\n<p><img decoding=\"async\" alt=\"Operating Systems: Three Easy Pieces. Part 3: Process API (t\u00f5lge)\" src=\"\/wp-content\/uploads\/2019\/04\/7e8ea54531b7717b7b42802550afd27b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Exec() kutse<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Operating Systems: Three Easy Pieces. Part 3: Process API (t\u00f5lge)\" src=\"\/wp-content\/uploads\/2019\/04\/dfe3a41c03bc35fd716a1b4c3af68c2f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVaatame kutset <b>exec()<\/b>. See s\u00fcsteemikutse on kasulik, kui soovime k\u00e4ivitada t\u00e4iesti teise programmi. Siin kutsume \u00fcles <b>execvp()<\/b> wc programmi k\u00e4ivitamiseks, mis on s\u00f5nade loendamise programm. Mida juhtub exec() kutse tegemisel? Sellele kutsele edastatakse argumentidena k\u00e4ivitatava faili nimi ja m\u00f5ned parameetrid. Seej\u00e4rel laaditakse koode ja staatilisi andmeid sellest k\u00e4ivitatavast failist ning asendatakse omaenda koodisegment. Muu m\u00e4lu, nagu virn ja hunnik, initialiseeritakse uuesti. P\u00e4rast seda operatsioonis\u00fcsteem lihtsalt t\u00e4idab programmi, edastades sellele argumendikomplekti. Seega ei loonud me uut protsessi, vaid muutsime jooksva programmi teiseks jooksvaks programmiks. P\u00e4rast exec() kutse tegemist on j\u00e4rglasel tunne, et algne programm ei ole \u00fcldse k\u00e4ivitatud.<\/p>\n<p>See k\u00e4ivitamise keerukus on t\u00e4iesti normaalne Unix shelli jaoks ja v\u00f5imaldab sellel shellil koodi t\u00e4ita p\u00e4rast kutset <b>fork()<\/b>, aga enne kutset <b>exec()<\/b>. Sellise koodi n\u00e4iteks v\u00f5ib olla shelli keskkonna kohandamine k\u00e4ivitatava programmi vajaduste j\u00e4rgi, enne selle vahetut k\u00e4ivitamist.<\/p>\n<p><b>Shell<\/b> \u2014 vaid kasutajate rakendus. See kuvab teile k\u00e4surea ja ootab, kuni kirjutate sinna midagi. Enamikul juhtudel, kui sinna kirjutada programmi nimi, leiab shell selle asukoha, kutsub esile fork() meetodi, seej\u00e4rel kutsub m\u00f5ne exec() t\u00fc\u00fcpi meetodi, et luua uus protsess ja ootab selle t\u00e4itmise l\u00f5ppemist wait() kutsumisega. Kui alampakett l\u00f5petab, naaseb shell wait() kutsumisest ja kuvab uuesti k\u00e4surea ning ootab j\u00e4rgmise k\u00e4su sisestamist.<\/p>\n<p>fork() ja exec() eraldamine v\u00f5imaldab shell'il teha j\u00e4rgmisi asju, n\u00e4iteks:<br \/>\n<b>wc fail &gt; new_file.<\/b><\/p>\n<p>Selles n\u00e4ites suunatakse wc programmi v\u00e4ljund faili. See, kuidas shell seda saavutab, on piisavalt lihtne \u2014 enne lapseprotsessi loomist ja kutsumist <b>exec()<\/b>, sulgeb shell standardse v\u00e4ljundvoo ja avab faili <b>new_file<\/b>, seega suunatakse kogu edaspidi k\u00e4ivitava programmi <b>wc<\/b> v\u00e4ljund faili asemel ekraanile.<\/p>\n<p><b>Unix pipe<\/b> on realiseeritakse sarnaselt, kuid erinevusega, et nad kasutavad pipe() kutsumist. Sellisel juhul on protsessi v\u00e4ljundvoog \u00fchendatud tuumasse paikneva pipe j\u00e4rjekorraga, millele on aga \u00fchendatud teise protsessi sisendvoog.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/447182\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0432 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440! \u0425\u043e\u0447\u0443 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0432\u0430\u0448\u0435\u043c\u0443 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u044e \u0441\u0435\u0440\u0438\u044e \u0441\u0442\u0430\u0442\u0435\u0439-\u043f\u0435\u0440\u0435\u0432\u043e\u0434\u043e\u0432 \u043e\u0434\u043d\u043e\u0439 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e\u0439 \u043d\u0430 \u043c\u043e\u0439 \u0432\u0437\u0433\u043b\u044f\u0434 \u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u044b \u2014 OSTEP. \u0412 \u044d\u0442\u043e\u043c \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0435 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0433\u043b\u0443\u0431\u043e\u043a\u043e \u0440\u0430\u0431\u043e\u0442\u0430 unix-\u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c, \u0430 \u0438\u043c\u0435\u043d\u043d\u043e \u2014 \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c\u0438, \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u043c\u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430\u043c\u0438, \u043f\u0430\u043c\u044f\u0442\u044c\u044e \u0438 \u043f\u0440\u043e\u0447\u0438\u0438\u043c\u0438 \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u043c\u0438 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0430\u043c\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0442 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e \u041e\u0421. \u041e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0432\u0441\u0435\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u043e\u0432 \u0432\u044b \u043c\u043e\u0436\u0435\u0442\u0435 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u0432\u043e\u0442 \u0442\u0443\u0442. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":23195,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-31229","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0432 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440! \u0425\u043e\u0447\u0443 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0432\u0430\u0448\u0435\u043c\u0443 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u044e \u0441\u0435\u0440\u0438\u044e \u0441\u0442\u0430\u0442\u0435\u0439-\u043f\u0435\u0440\u0435\u0432\u043e\u0434\u043e\u0432 \u043e\u0434\u043d\u043e\u0439 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e\u0439 \u043d\u0430 \u043c\u043e\u0439 \u0432\u0437\u0433\u043b\u044f\u0434 \u043b\u0438\u0442\u0435\u0440\u0430\u0442\u0443\u0440\u044b \u2014 OSTEP. \u0412 \u044d\u0442\u043e\u043c \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0435 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0433\u043b\u0443\u0431\u043e\u043a\u043e \u0440\u0430\u0431\u043e\u0442\u0430 unix-\u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c, \u0430 \u0438\u043c\u0435\u043d\u043d\u043e \u2014 \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c\u0438, \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u043c\u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430\u043c\u0438, \u043f\u0430\u043c\u044f\u0442\u044c\u044e \u0438 \u043f\u0440\u043e\u0447\u0438\u0438\u043c\u0438 \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u043c\u0438 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0430\u043c\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0442 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e \u041e\u0421. \u041e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0432\u0441\u0435\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u043e\u0432 \u0432\u044b \u043c\u043e\u0436\u0435\u0442\u0435 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u0432\u043e\u0442 \u0442\u0443\u0442.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/operating-systems-three-easy-pieces-part-3-process-api-perevod\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"et_EE\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47Operating Systems: Three Easy Pieces. 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Originaale k\u00f5igist materjalidest saate vaadata siit.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/operating-systems-three-easy-pieces-part-3-process-api-perevod","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Operating Systems: Three Easy Pieces. 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