Android |
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Directory Structure
Directories in Android would vary depending on which version of Android you are using and which mobile phone you are using, but the important directories would be common to most of the devices and version. Following is from my mobile phone which is based on Android 5.1
This is the mount point for user account. If you do 'ls' in this folder, you will see a lot of folder named uidxxxx
This is symbolic link for /sys/kernel/debug. It means that the physical location of this directory is /sys/kernel/debug
This is the mount point for a tmpfs file system, which defines the devices available to applications
This is symbolic link for /system/etc. It means that the physical location of this directory is /system/etc. This directory contains the configuration files required by all the programs installed on the system. One example from my test phone is as follows. DxHDCP.cfg IPACM_cfg.xml NOTICE.html.gz acdbdata amzn.mshop.properties apns-conf.xml app_audio_config.xml appops_policy.xml audio_effects.conf audio_platform_info.xml audio_policy.conf bluetooth brunch_featureinfo.xml brunch_featureswitch.xml brunch_media_codec.xml brunch_media_parser.xml brunch_notusedcodecs.xml brunch_player_list.xml bssid.dat cacert_location.pem camera_config.xml capability.xml clatd.conf cm_package_names.xml cne data dcm_settings.xml dhcpcd dpm ethertypes eula event-log-tags fallback_fonts.xml fallback_fonts_ame.xml fallback_fonts_ame_email.xml fallback_fonts_email.xml featureset.xml firmware flp.conf fonts.xml fonts_ame.xml fonts_lge.xml gnss-conf.xml gps.conf hcidump.sh hosts hsic.control.bt.sh init.ath3k.bt.sh init.crda.sh init.p1_chcon_keystore.sh init.qcom.audio.sh init.qcom.bt.sh init.qcom.coex.sh init.qcom.debug.sh init.qcom.efs.sync.sh init.qcom.post_boot.sh init.qcom.sdio.sh init.qcom.uicc.sh init.qcom.wifi.sh init.recovery.p1_chcon_keystore.sh interactionconfig.xml izat.conf led libnfc-brcm.conf libnfc-nxp.conf listen_platform_info.xml logmask lowi.conf media_codecs.xml media_codecs_google_audio.xml media_codecs_google_telephony.xml media_codecs_google_video.xml media_profiles.xml mixer_paths.xml mkshrc mrg_default_forms msap.conf mts_mask networksettings_features.xml nfc nfcee_access.xml permissions ppp preload.filter preloaded-classes qca6234-service.sh qmi_fw.conf qremote_conf.xml quipc.conf ramoops_backup.sh recovery-resource.dat rssi.xml sap.conf sec_config security sensors setting_features.xml system_fonts.xml telephony.xml thermal-engine-8992.conf thermal-engine-default.conf updatecmds user.filter usf_post_boot.sh usf_settings.sh wfdconfig.xml wifi xtra_root_cert.pem xtwifi.conf
This is the mount point of SD card and some other file system. One example contents on my phone is as below. drwxr-xr-x root system 2015-03-19 00:21 asec drwx------ media_rw media_rw 2015-03-19 00:21 media_rw drwxr-xr-x root system 2015-03-19 00:21 obb drwxr-xr-x root root 2015-03-19 00:21 pstore lrwxrwxrwx root root 2015-03-19 00:21 sdcard -> /storage/emulated/legacy drwx------ root root 2015-03-19 00:21 secure drwx------ shell shell 2015-03-19 00:21 shell
This is the mount point for the procfs file system, which provides access to kernel data structures. Programs, such as ps, lsof, and vmstat extract information from this directory.
Usually this is set as a symbolic link. In case of my device, it is set as as symbolic link to /storage/emulated/legacy. Wherever the physical location is, sdcard points to SD Card.
This is the mount point for the sysfs pseudo file system, which is a reflection of the kernel's device object structure. One example contents from my device is as follows. As you see, there are several directories in it and each of these directories has a lot of contents. It would take a lot of time and efforts to understand the details and I would not comments in details for now. drwxr-xr-x root root 2015-08-13 16:16 block drwxr-xr-x root root 2015-08-13 23:27 bus drwxr-xr-x root root 2015-03-19 00:21 class drwxr-xr-x root root 2015-08-13 23:27 dev drwxr-xr-x root root 2015-03-19 00:21 devices drwxr-xr-x root root 2015-08-13 23:27 firmware drwxr-xr-x root root 2015-03-19 00:21 fs drwxr-xr-x root root 2015-03-19 00:21 kernel drwxr-xr-x root root 2015-03-19 00:21 module drwxr-xr-x root root 2015-03-19 00:21 power
This file contains most of the kernel programs (e.g, shell commands), libraries and other programes installed by users. It is like the combination of 'Windows' and 'Program Files' folder in your windows system. -rw-r--r-- root root 1574048 2015-07-07 01:50 DFFileList.txt drwxr-xr-x root root 2015-07-07 01:49 app drwxr-xr-x root shell 2015-07-07 01:50 bin -rw-r--r-- root root 11831 2015-07-07 00:42 build.prop drwxr-xr-x root root 2015-07-07 01:50 etc drwxr-xr-x root root 2015-07-07 01:37 fonts drwxr-xr-x root root 2015-07-07 01:48 framework drwxr-xr-x root root 2015-07-07 01:44 lib drwxr-xr-x root root 2015-07-07 01:43 lib64 drwx------ root root 1969-12-31 19:00 lost+found drwxr-xr-x root root 2015-07-07 01:31 media drwxr-xr-x root root 2015-07-07 01:50 priv-app drwxr-xr-x root root 2015-07-07 00:41 rfs drwxr-xr-x root root 2015-07-07 01:31 sounds drwxr-xr-x root root 2015-07-07 00:39 tts -rw-r--r-- root root 35239936 2015-07-07 01:31 usbautorun.iso drwxr-xr-x root root 2015-07-07 01:37 usr drwxr-xr-x root shell 2015-07-07 01:41 vendor drwxr-xr-x root shell 2015-07-07 01:42 xbin
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