Qhov Tseem Ceeb Qhov Sib Txawv - Kev Hu Xov Tooj vs Lub Tsev Qiv Ntawv Hu
System hu thiab tsev qiv ntawv hu muaj feem cuam tshuam nrog kev ua haujlwm ntawm lub khoos phis tawj. Lub khoos phis tawj tuaj yeem ua haujlwm hauv ob hom; uas yog, tus neeg siv hom thiab ntsiav hom. Qhov sib txawv tseem ceeb ntawm kev hu xov tooj thiab tsev qiv ntawv yog qhov kev hu xov tooj yog qhov ua haujlwm los ntawm cov ntsiav kom nkag mus rau hom ntsiav kom nkag mus rau cov khoom siv kho vajtse whereas, lub tsev qiv ntawv hu yog ib txoj haujlwm muab los ntawm cov tsev qiv ntawv programming. Piv txwv li, qhib () yog lub kaw lus hu thiab fopen () yog lub tsev qiv ntawv hu. Thaum fopen () hauv C program, siv lub tsev qiv ntawv stdio.h header. Tom qab ntawd lub kaw lus hu 'qhib (),' yog siv los ntawm cov ntsiav los ua tiav cov haujlwm qhib cov ntaub ntawv.
Qhov System Hu yog dab tsi?
Ib lub computer ua haujlwm hauv ob hom. Lawv yog cov neeg siv hom thiab kernel hom. Qee cov txheej txheem ua haujlwm ntawm lub khoos phis tawj. Cov txheej txheem yog ib qho kev pab cuam hauv kev ua tiav. Thaum daim ntawv thov cov kev pab cuam tab tom khiav, lub computer nyob rau hauv hom neeg siv. Yog tias xav tau ib qho khoom siv kho vajtse, cov txheej txheem xa ib daim ntawv thov mus rau kernel, thiab lub computer nkag mus rau hauv hom ntsiav. Cov kev thov no raug xa nrog kev hu xov tooj. Lub computer tab tom hloov ntawm ob hom no nquag. Thaum cov haujlwm tiav lawm, lub khoos phis tawj rov qab mus rau hom neeg siv los ntawm hom ntsiav. Qhov kev hloov pauv no yog hu ua "kev hloov pauv hloov pauv." Kev hu xov tooj yog qhov sib cuam tshuam ntawm kev khiav hauj lwm thiab cov neeg siv cov kev pab cuam.
Daim duab 01: Kev Hu Xov Tooj
Muaj ntau hom kev hu xov tooj. Tsim, txiav cov txheej txheem, ua tiav cov txheej txheem, faib thiab lub cim xeeb pub dawb tuaj yeem ua tiav siv "Kev Tswj Xyuas Txheej Txheem Hu." "File Management System Hu" tuaj yeem siv los tsim, tshem tawm, nyeem, sau, qhib, kaw cov ntaub ntawv. Cov txheej txheem yuav tsum muaj qee qhov kev pabcuam los ua kom tiav. Thov thiab tso tawm cov cuab yeej ua tiav los ntawm "Device Management System Calls." "Information Management System Calls" tuaj yeem siv kom tau txais cov ntaub ntawv kaw lus thiab kom tau txais cov txheej txheem thiab cov khoom siv. Cov txheej txheem yog kev sib txuas lus. Qhov kev sib txuas lus no yog ua tiav siv "Kev Sib Txuas Lus Sib Tham Hu." Xa cov ntaub ntawv xwm txheej, tsim thiab tshem tawm kev sib txuas lus sib txuas thiab xa, tau txais cov lus tuaj yeem ua tiav siv kev sib txuas lus hu.
Lub Tsev Qiv Ntawv Hu Li Cas?
Library hu yog lub luag haujlwm muab los ntawm cov tsev qiv ntawv programming. Ua ntej ua ib lub tsev qiv ntawv hu, lub tsev qiv ntawv yuav tsum tau import. Kev hu hauv tsev qiv ntawv yuav nyob ntawm qhov kev hu xov tooj.
Hauv C, cov haujlwm no tuaj yeem siv rau hauv qhov program los ntawm kev suav nrog cov ntaub ntawv header. Cov ntaub ntawv header suav nrog siv cov lus qhia ua ntej include. Preprocessor scans cov ntaub ntawv teev tseg ua ntej txuas ntxiv nrog rau qhov seem ntawm cov ntaub ntawv. Qee lub tsev qiv ntawv muaj raws li hauv qab no, "math.h" lub tsev qiv ntawv suav nrog cov haujlwm ntsig txog kev ua lej. "stdio.h" lub tsev qiv ntawv muab kev ua haujlwm rau kev ua haujlwm tawm tswv yim thiab tso tawm. "fopen()" qhib cov ntaub ntawv npe taw qhia. "fclose()" kaw cov ntaub ntawv. "printf() yog siv los xa cov ntaub ntawv tawm tswv yim mus rau tus qauv tso zis. "fprintf()" yog siv los xa cov ntaub ntawv tawm tswv yim mus rau kwj. "scanf()" yog siv los nyeem formatted input los ntawm cov tswv yim txheem. “stdlib.h” muab lub luag haujlwm rau kev tswj hwm nco thiab “time.h” muab cov haujlwm rau lub sijhawm thiab hnub tswj xyuas.
Dab tsi yog qhov zoo sib xws ntawm Kev Hu Xov Tooj thiab Tsev Qiv Ntawv Hu?
Ob leeg muaj feem cuam tshuam nrog kev ua haujlwm
Dab tsi yog qhov sib txawv ntawm Kev Hu Xov Tooj thiab Tsev Qiv Ntawv Hu?
System Call vs Library Call |
|
| Kev hu xov tooj yog ib txoj haujlwm muab los ntawm cov ntsiav kom nkag mus rau hom ntsiav kom nkag mus rau cov khoom siv kho vajtse. | Library hu yog lub luag haujlwm muab los ntawm lub tsev qiv ntawv programming. |
| hom kev ua tiav | |
| Ib qho kev hu xov tooj raug tua nyob rau hauv hom ntsiav. | Ib lub tsev qiv ntawv hu tau ua tiav hauv hom neeg siv. |
| hom hloov pauv | |
| A System hu hloov ntawm hom neeg siv mus rau hom ntsiav. | Tsis muaj kev hloov ntawm hom neeg siv mus rau hom ntsiav hauv tsev qiv ntawv hu. |
| portability | |
| A System hu tsis tau portable. | Lub tsev qiv ntawv hu yog nqa tau. |
Summary – System Hu vs Library Call
A System hu yog siv nyob rau hauv lub ntsiav, thiab lub tsev qiv ntawv hu yog siv nyob rau hauv tus neeg siv qhov chaw. Qhov sib txawv ntawm kev hu xov tooj thiab lub tsev qiv ntawv hu yog qhov kev hu xov tooj yog ib txoj haujlwm muab los ntawm cov ntsiav kom nkag mus rau hom ntsiav kom nkag mus rau cov khoom siv kho vajtse thiab cov tsev qiv ntawv hu yog ib qho haujlwm muab los ntawm cov tsev qiv ntawv programming. Cov tsev qiv ntawv hu tuaj yeem nyob ntawm qhov kev hu xov tooj los ua kom tiav cov haujlwm. qhib (), fork(), cd() yog qee qhov piv txwv ntawm kev hu xov tooj. fopen (), fprintf () yog cov piv txwv ntawm cov tsev qiv ntawv hu.
Download the PDF Version of System Call vs Library Call
Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline hom phiaj raws li daim ntawv ceeb toom. Thov rub tawm PDF version ntawm no Qhov txawv nruab nrab ntawm kev hu xov tooj thiab tsev qiv ntawv Hu
