working with unix processes

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1、DownloadfromWow!eBookWorkingwithUnixProcessesCopyright©2012JesseStorimer.Allrightsreserved.Thisebookislicensedforindividualuseonly.Thisisaone-manoperation,pleaserespectthetimeandeffortthatwentintothisbook.Ifyoucamebyafreecopyandfindituseful,youcancompens

2、atemeathttp://workingwithunixprocesses.com.AcknowledgementsAbigthankyoutoafewawesomefolkswhoreadearlydraftsofthebook,helpedmeunderstandhowtomarketthisthing,gavemeapushwhenIneededit,andwereall-aroundextremelyhelpful:SamStorry,JesseKaunisviita,andMarc-AndréCournoyer.Ihaveto

3、expressmyimmensegratitudetowardsmywifeanddaughterfornotonlysupportingtheerraticschedulethatmadethisbookpossible,butalsoalwaysbeingtheretoprovideasecondopinion.WithoutyourloveandsupportIcouldn'thavedonethis.Youmakeitallworthwhile.2DownloadfromWow!eBookCon

4、tents9Introduction23EverythingisaFile11Primer23DescriptorsRepresentResources11WhyCare?27StandardStreams12HarnessthePower!28IntheRealWorld12Overview28SystemCalls13SystemCalls29ProcessesHaveResourceLimits14Nomenclature,wtf(2)29FindingtheLimits16Processes:TheAtomsofUnix30Sof

5、tLimitsvs.HardLimits18ProcessesHaveIDs31BumpingtheSoftLimit18CrossReferencing32ExceedingtheLimit19IntheRealWorld32OtherResources20SystemCalls33IntheRealWorld21ProcessesHaveParents34SystemCalls21CrossReferencing35ProcessesHaveanEnvironment22IntheRealWorld36It'sahash,right?

6、22SystemCalls37IntheRealWorld23ProcessesHaveFileDescriptors37SystemCallsDownloadfromWow!eBook38ProcessesHaveArguments58MRI/RBXusers38It'sanArray!60ProcessesCanWait39IntheRealWorld61Babysitting40ProcessesHaveNames62Process.waitandCousins40NamingProcesses6

7、3CommunicatingwithProcess.wait242IntheRealWorld65WaitingforSpecificChildren43ProcessesHaveExitCodes66RaceConditions43HowtoExitaProcess68IntheRealWorld47ProcessesCanFork68SystemCalls47Usethefork(2),Luke69ZombieProcesses51MulticoreProgramming?69GoodThingsCometoThoseWhowait(

8、2)51UsingaBlock71WhatDoZombiesLookLike?52IntheRealWorld71InTheRealWorld52SystemCalls72SystemCall