[working.with.unix.processes(2012.5)].jesse.storimer.文字版

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1、WorkingwithUnixProcessesCopyright©2012JesseStorimer.Allrightsreserved.Thisebookislicensedforindividualuseonly.Thisisaone-manoperation,pleaserespectthetimeandeffortthatwentintothisbook.Ifyoucamebyafreecopyandfindituseful,youcancompensatemeathttp://working

2、withunixprocesses.com.AcknowledgementsAbigthankyoutoafewawesomefolkswhoreadearlydraftsofthebook,helpedmeunderstandhowtomarketthisthing,gavemeapushwhenIneededit,andwereall-aroundextremelyhelpful:SamStorry,JesseKaunisviita,andMarc-AndréCournoyer.Ihavetoexp

3、ressmyimmensegratitudetowardsmywifeanddaughterfornotonlysupportingtheerraticschedulethatmadethisbookpossible,butalsoalwaysbeingtheretoprovideasecondopinion.WithoutyourloveandsupportIcouldn'thavedonethis.Youmakeitallworthwhile.2Contents9Introduction23Ever

4、ythingisaFile11Primer23DescriptorsRepresentResources11WhyCare?27StandardStreams12HarnessthePower!28IntheRealWorld12Overview28SystemCalls13SystemCalls29ProcessesHaveResourceLimits14Nomenclature,wtf(2)29FindingtheLimits16Processes:TheAtomsofUnix30SoftLimit

5、svs.HardLimits18ProcessesHaveIDs31BumpingtheSoftLimit18CrossReferencing32ExceedingtheLimit19IntheRealWorld32OtherResources20SystemCalls33IntheRealWorld21ProcessesHaveParents34SystemCalls21CrossReferencing35ProcessesHaveanEnvironment22IntheRealWorld36It's

6、ahash,right?22SystemCalls37IntheRealWorld23ProcessesHaveFileDescriptors37SystemCalls38ProcessesHaveArguments58MRI/RBXusers38It'sanArray!60ProcessesCanWait39IntheRealWorld61Babysitting40ProcessesHaveNames62Process.waitandCousins40NamingProcesses63Communic

7、atingwithProcess.wait242IntheRealWorld65WaitingforSpecificChildren43ProcessesHaveExitCodes66RaceConditions43HowtoExitaProcess68IntheRealWorld47ProcessesCanFork68SystemCalls47Usethefork(2),Luke69ZombieProcesses51MulticoreProgramming?69GoodThingsCometoThos

8、eWhowait(2)51UsingaBlock71WhatDoZombiesLookLike?52IntheRealWorld71InTheRealWorld52SystemCalls72SystemCalls53OrphanedProcesses73ProcessesCanGetSignals53OutofControl73TrappingSIGCHLD54AbandonedChildren75SIGCHLDandConcurrency