Chapter 1 Introduction to System Programming

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UNIXLectureNotesChapter1IntroductiontoSy stemProgrammingStewartWeissChapter1Intro ductiontoSystemProgramming UNIXisbasicallyasimpleop eratingsystem,butyouhavetob eageniustounderstandthesimplicity. -DennisRitchie, ,Systemcal lsandlibraries,Processes,loginsandshel ls,Environments,manpages,Users,theroot,a ndgroups,Authentication,Filesystem, lehierarchy,Filesanddirectories,Devicesp ecial les,UNIXstandards,POSIX,Systemprogrammin g,TerminalsandANSIescapesequences,Histor yofUNIX,syscal l,getpid, ductionAmo dernsoftwareapplicationtypicallyneedstom anageb , les,screendisplays, ewrittenasacollectionofco op eratingthreadsorsub-pro cessesthatco ordinatetheiractionswithresp dernop eratingsystemspreventapplicationsoftware frommanagingsystemresourcesdirectly, ,whenrunningonmo dernop eratingsystems,applicationscannotdrawtot hescreendirectlyorreadorwrite erformscreenop erationsor leI/Otheymustusetheinterfacethattheop eratingsystemde ()orfprintf()

of programming that uses these services is called system prgroamming . System programs make re- ... More will be said about les, lenames, and the le hierarchy in Section 1.8. 1.3.2 Processes A prgroam is an executable le, and a pressco is an instance of a running program. When a program. UNIX cturLee Notes Chapter 1 Intrductiono to System ...

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