working with unix processes - jesse storimer_1269

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

2、nowledgementsAbigthankyoutoafewawesomefolkswhoreadearlydraftsofthebook,helpedmeunderstandhowtomarketthisthing,gavemeapushwhenIneededit,andwereall-aroundextremelyhelpful:SamStorry,JesseKaunisviita,andMarc-AndréCournoyer.Ihavetoexpressmyimmensegratitudetowardsmywifeanddaughterforn

3、otonlysupportingtheerraticschedulethatmadethisbookpossible,butalsoalwaysbeingtheretoprovideasecondopinion.WithoutyourloveandsupportIcouldn'thavedonethis.Youmakeitallworthwhile.2Contents9Introduction23EverythingisaFile11Primer23DescriptorsRepresentResources11WhyCare?27StandardStr

4、eams12HarnessthePower!28IntheRealWorld12Overview28SystemCalls13SystemCalls29ProcessesHaveResourceLimits14Nomenclature,wtf(2)29FindingtheLimits16Processes:TheAtomsofUnix30SoftLimitsvs.HardLimits18ProcessesHaveIDs31BumpingtheSoftLimit18CrossReferencing32ExceedingtheLimit19IntheRea

5、lWorld32OtherResources20SystemCalls33IntheRealWorld21ProcessesHaveParents34SystemCalls21CrossReferencing35ProcessesHaveanEnvironment22IntheRealWorld36It'sahash,right?22SystemCalls37IntheRealWorld23ProcessesHaveFileDescriptors37SystemCalls38ProcessesHaveArguments58MRI/RBXusers38I

6、t'sanArray!60ProcessesCanWait39IntheRealWorld61Babysitting40ProcessesHaveNames62Process.waitandCousins40NamingProcesses63CommunicatingwithProcess.wait242IntheRealWorld65WaitingforSpecificChildren43ProcessesHaveExitCodes66RaceConditions43HowtoExitaProcess68IntheRealWorld47Process

7、esCanFork68SystemCalls47Usethefork(2),Luke69ZombieProcesses51MulticoreProgramming?69GoodThingsCometoThoseWhowait(2)51UsingaBlock71WhatDoZombiesLookLike?52IntheRealWorld71InTheRealWorld52SystemCalls72SystemCalls53OrphanedProcesses73ProcessesCanGetSignals53OutofControl73TrappingSI

8、GCHLD54AbandonedChildren75SIGCHLDandConcurrency