android23sd卡掛載流程淺析(編輯修改稿)
2025-05-04 05:06 本頁面
【文章內(nèi)容簡(jiǎn)介】 0。strerror(errno))。22. }23. if(!strcmp(devtype,disk)){24. spanstyle=color:ff0000。handleDiskAdded(dp,evt)。spanstyle=color:33cc00。//SD卡插入是Add事件/span/span25. }else{26. handlePartitionAdded(dp,evt)。27. }28. }elseif(action==NetlinkEvent::NlActionRemove){29. if(!strcmp(devtype,disk)){30. handleDiskRemoved(dp,evt)。31. }else{32. handlePartitionRemoved(dp,evt)。33. }34. }elseif(action==NetlinkEvent::NlActionChange){35. if(!strcmp(devtype,disk)){36. handleDiskChanged(dp,evt)。37. }else{38. handlePartitionChanged(dp,evt)。39. }40. }else{41. SLOGW(Ignoringnonadd/remove/changeevent)。42. }43. 44. return0。45. }46. }47. errno=ENODEV。48. return1。49. }[cpp] view plaincopy1. int2. DirectVolume::handleBlockEvent(NetlinkEvent*evt){3. constchar*dp=evtfindParam(DEVPATH)。4. 5. PathCollection::iteratorit。6. for(it=mPathsbegin()。it!=mPathsend()。++it){7. if(!strncmp(dp,*it,strlen(*it))){8. /*Wecanhandlethisdisk*/9. intaction=evtgetAction()。10. constchar*devtype=evtfindParam(DEVTYPE)。11. 12. if(action==NetlinkEvent::NlActionAdd){13. intmajor=atoi(evtfindParam(MAJOR))。14. intminor=atoi(evtfindParam(MINOR))。15. charnodepath[255]。16. 17. snprintf(nodepath,18. sizeof(nodepath),/dev/block/vold/%d:%d,19. major,minor)。20. if(createDeviceNode(nodepath,major,minor)){21. SLOGE(Errormakingdevicenode39。%s39。(%s),22. nodepath,23. 24. strerror(errno))。25. }26. if(!strcmp(devtype,disk)){27. span28. style=color:ff0000。handleDiskAdded(dp,evt)。span29. style=color:33cc00。//SD卡插入是Add事件/span/span30. }else{31. handlePartitionAdded(dp,evt)。32. }33. }elseif(action==NetlinkEvent::NlActionRemove){34. if(!strcmp(devtype,disk)){35. handleDiskRemoved(dp,evt)。36. }else{37. handlePartitionRemoved(dp,evt)。38. }39. }elseif(action==NetlinkEvent::NlActionChange){40. if(!strcmp(devtype,disk)){41. handleDiskChanged(dp,evt)。42. }else{43. handlePartitionChanged(dp,evt)。44. }45. }else{46. SLOGW(Ignoringnonadd/remove/changeevent)。47. }48. 49. return0。50. }51. }52. errno=ENODEV。53. return1。54. } DirectVolume::handleDiskAdded(const char *devpath, NetlinkEvent *evt)//代碼路徑：//在該方法中廣播disk insert的廣播消息(這里的廣播不同于Java中的廣播，這里實(shí)際上是Socket)。view plain1. voidDirectVolume::handleDiskAdded(constchar*devpath,NetlinkEvent*evt){2. mDiskMajor=atoi(evtfindParam(MAJOR))。3. mDiskMinor=atoi(evtfindParam(MINOR))。4. 5. constchar*tmp=evtfindParam(NPARTS)。6. if(tmp){7. mDiskNumParts=atoi(tmp)。8. }else{9. SLOGW(Kernelblockueventmissing39。NPARTS39。)。10. mDiskNumParts=1。11. }12. 13. charmsg[255]。14. 15. intpartmask=0。16. inti。17. for(i=1。i=mDiskNumParts。i++){18. partmask|=(1i)。19. }20. mPendingPartMap=partmask。21. 22. if(mDiskNumParts==0){23. ifdefPARTITION_DEBUG24. SLOGD(Dv::diskInsNopartitionsgoodtogoson!)。25. endif26. setState(Volume::State_Idle)。27. }else{28. ifdefPARTITION_DEBUG29. SLOGD(Dv::diskInswaitingfor%dpartitions(mask0x%x),30. mDiskNumParts,mPendingPartMap)。31. endif32. setState(Volume::State_Pending)。33. }34. 35. snprintf(msg,sizeof(msg),Volume%s%sdiskinserted(%d:%d),36. getLabel(),getMountpoint(),mDiskMajor,mDiskMinor)。37. spanstyle=color:ff0000。mVmgetBroadcaster()sendBroadcast(ResponseCode::VolumeDiskInserted,38. 16
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