Execl hauv C yog dab tsi?
Execl hauv C yog dab tsi?

Video: Execl hauv C yog dab tsi?

Video: Execl hauv C yog dab tsi?
Video: yog hmoov dab tsi. Zoo Xyooj (cover) 2024, Kaum ib hlis
Anonim

ua execl -- Overlay Calling Process thiab RunNewProgram

Cov ua execl muaj nuj nqi yog feem ntau sivtooverlay ib tug txheej txheem duab uas tau tsim los ntawm ib tug hu rau theforkfunction. Yog tias tus txheej txheem tshiab duab yog ib txwm SAS / C mainprogram, cov npe ntawm cov lus sib cav yuav raug xa mus rau argv raws li apointerto ib qho array ntawm cov hlua.

Tsis tas li ntawd, Execve hauv C yog dab tsi?

ua exec () ua tiav qhov kev pab cuam hu ua tobypathname. Qhov no ua rau qhov kev zov me nyuam uas tam sim no tab tom khiav los ntawm cov txheej txheem hu yuav raug hloov nrog ib qho kev pab cuam tshiab, nrog cov pawg tshiab, pawg, thiab (pib pib thiab tsis tsim nyog) cov ntaub ntawv ntu.

Kuj Paub, Exec puas tsim cov txheej txheem tshiab? ua exec yuav hloov cov ntsiab lus ntawm qhov tam sim no khiav txheej txheem nrog cov ntaub ntawv los ntawm ib tug programbinary. Yog li cov txheej txheem lub plhaub raws li thaum launchinga tshiab program yog thawj zaug fork, tsim ib txheej txheem tshiab , thiab tom qab ntawd ua exec (ie load rau hauv memoryandexecute) qhov kev pab cuam binary nws yuav tsum tau khiav.

Kuj lo lus nug yog, dab tsi yog exec () system hu?

ua exec ( system hu ) Incomputing, ua exec yog lub luag haujlwm ntawm kev ua haujlwm qhov system thatruns ib executable cov ntaub ntawv nyob rau hauv cov ntsiab lus ntawm anal twb muaj lawm txheej txheem, hloov lub yav dhau los executable. Txoj cai no tseem raug xa mus ua ib qho overlay.

Execve siv rau dab tsi?

ua exec () yog ib txoj haujlwm siv rau launchaprocess los ntawm nrog rau lwm tus txheej txheem. Lub executable taw tes toby "filename" hloov cov txheej txheem tam sim no. Txoj haujlwm ua exec yeej tsis rov qab mus rau qhov kev hu xov tooj tshwj tsis yog muaj qhov yuam kev inexecuting lub executable.

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