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()access lesdirectly,theydonot.

of programming that uses these services is called system prgroamming . System programs make re-quests for resources and services directly from the operating system and may even access the system 1 eW use the term platform to mean a speci c operating system running on a speci c machine architecture.

  Programming, Operating, System, Programming system