博客内容介绍了在Android系统中，应用进程的UID通常以app开头，编号为大于10000的数值，该数值与进程PID减去10000相等。这些信息可以通过adb shell ps命令查看，例如com.andy.androidtest的UID为10037。此外，还提到了AID_APP在Android_filesystem_config.h文件中的定义。
当在adb shell中查询当前进程情况时(ps),可以看到app应用都分配了一个user属性，
如app_37分配给了自己创建的应用com.andy.androidtest，在不卸载这个应用之前，这个属性是保持不变的。
非系统的应用都是以app开头命名，之后的编号就是uid（确切的说是uid-10000）。
# ps
ps
USER PID PPID VSIZE RSS WCHAN PC NAME
root 1 0 312 220 c009b74c 0000ca4c S /init
root 2 0 0 0 c004e72c 00000000 S kthreadd
root 3 2 0 0 c003fdc8 00000000 S ksoftirqd/0
root 4 2 0 0 c004b2c4 00000000 S events/0
root 5 2 0 0 c004b2c4 00000000 S khelper
root 6 2 0 0 c004b2c4 00000000 S suspend
root 7 2 0 0 c004b2c4 00000000 S kblockd/0
root 8 2 0 0 c004b2c4 00000000 S cqueue
root 9 2 0 0 c018179c 00000000 S kseriod
root 10 2 0 0 c004b2c4 00000000 S kmmcd
root 11 2 0 0 c006fc74 00000000 S pdflush
root 12 2 0 0 c006fc74 00000000 S pdflush
root 13 2 0 0 c00744e4 00000000 S kswapd0
root 14 2 0 0 c004b2c4 00000000 S aio/0
root 22 2 0 0 c017ef48 00000000 S mtdblockd
root 23 2 0 0 c004b2c4 00000000 S kstriped
root 24 2 0 0 c004b2c4 00000000 S hid_compat
root 25 2 0 0 c004b2c4 00000000 S rpciod/0
root 26 2 0 0 c019d16c 00000000 S mmcqd
root 27 1 740 220 c0158eb0 afd0d8ac S /system/bin/sh
system 28 1 808 208 c01a94a4 afd0db4c S /system/bin/servicemanager
root 29 1 3736 492 ffffffff afd0e1bc S /system/bin/vold
root 30 1 3716 460 ffffffff afd0e1bc S /system/bin/netd
root 31 1 668 200 c01b52b4 afd0e4dc S /system/bin/debuggerd
radio 32 1 5392 616 ffffffff afd0e1bc S /system/bin/rild
root 33 1 102056 25344 c009b74c afd0dc74 S zygote
media 34 1 22764 3412 ffffffff afd0db4c S /system/bin/mediaserver
root 35 1 812 276 c02181f4 afd0d8ac S /system/bin/installd
keystore 36 1 1616 336 c01b52b4 afd0e4dc S /system/bin/keystore
root 37 1 740 224 c003da38 afd0e7bc S /system/bin/sh
root 38 1 852 296 c00b8fec afd0e90c S /system/bin/qemud
root 40 1 3396 188 ffffffff 0000ecc4 S /sbin/adbd
root 51 37 796 252 c02181f4 afd0d8ac S /system/bin/qemu-props
system 59 33 190964 39172 ffffffff afd0db4c S system_server
app_23 110 33 139004 20216 ffffffff afd0eb08 S jp.co.omronsoft.openwnn
radio 114 33 145612 22484 ffffffff afd0eb08 S com.android.phone
app_25 117 33 150104 24568 ffffffff afd0eb08 S com.android.launcher
system 119 33 137096 18980 ffffffff afd0eb08 S com.android.settings
app_0 151 33 144956 24500 ffffffff afd0eb08 S android.process.acore
app_22 162 33 132052 18252 ffffffff afd0eb08 S com.android.music
app_12 171 33 133680 18712 ffffffff afd0eb08 S com.android.quicksearchbox
app_7 180 33 130900 17920 ffffffff afd0eb08 S com.android.protips
app_2 189 33 134704 19272 ffffffff afd0eb08 S android.process.media
app_9 203 33 131712 18736 ffffffff afd0eb08 S com.android.alarmclock
app_15 214 33 144660 19600 ffffffff afd0eb08 S com.android.mms
root 222 40 740 228 c003da38 afd0e7bc S /system/bin/sh
root 223 222 692 292 c009b74c afd0dc74 S logcat
app_10 232 33 132760 17612 ffffffff afd0eb08 S com.android.defcontainer
app_30 247 33 135192 20036 ffffffff afd0eb08 S com.android.email
app_28 262 33 130696 17408 ffffffff afd0eb08 S com.svox.pico
root 285 40 740 332 c003da38 afd0e7bc S /system/bin/sh
app_37 598 33 132460 19900 ffffffff afd0eb08 S com.andy.androidtest
root 605 285 888 336 00000000 afd0d8ac R ps通过下面的代码我们可以枚举所有在运行的process的uid等属性：
private RunningAppProcessInfo getForegroundApp()
{
RunningAppProcessInfo result = null, info = null;
if (mActivityManager == null)
mActivityManager = (ActivityManager) mContext
.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningAppProcessInfo> l = mActivityManager
.getRunningAppProcesses();
Iterator<RunningAppProcessInfo> i = l.iterator();
while (i.hasNext())
{
info = i.next();
Log.v(TAG,"running app process:"+String.valueOf(info.uid)+" "+info.processName);
if (info.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND
&& !isRunningService(info.processName))
{
result = info;
//Log.v(TAG,"running app:"+info.processName);
break;
}
}
return result;
}输出结果：
10-25 08:41:16.766: V/ANDROIDTEST(598): running app process:10037 com.andy.androidtest
10-25 08:41:16.774: V/ANDROIDTEST(598): running app process:10025 com.android.launcher
10-25 08:41:16.774: V/ANDROIDTEST(598): running app process:10028 com.svox.pico
10-25 08:41:16.774: V/ANDROIDTEST(598): running app process:10010 com.android.defcontainer
10-25 08:41:16.774: V/ANDROIDTEST(598): running app process:10002 android.process.media
10-25 08:41:16.774: V/ANDROIDTEST(598): running app process:10012 com.android.quicksearchbox
10-25 08:41:16.774: V/ANDROIDTEST(598): running app process:10022 com.android.music
10-25 08:41:16.774: V/ANDROIDTEST(598): running app process:10007 com.android.protips
10-25 08:41:16.774: V/ANDROIDTEST(598): running app process:10023 jp.co.omronsoft.openwnn
10-25 08:41:16.785: V/ANDROIDTEST(598): running app process:1000 system
10-25 08:41:16.785: V/ANDROIDTEST(598): running app process:1001 com.android.phone
10-25 08:41:16.785: V/ANDROIDTEST(598): running app process:10030 com.android.email
10-25 08:41:16.785: V/ANDROIDTEST(598): running app process:10015 com.android.mms
10-25 08:41:16.795: V/ANDROIDTEST(598): running app process:10009 com.android.alarmclock
10-25 08:41:16.795: V/ANDROIDTEST(598): running app process:10000 android.process.acore
10-25 08:41:16.795: V/ANDROIDTEST(598): running app process:1000 com.android.settings
可以看出,这些应用的process 的 uid是大于10000的，ps显示的结果中app_xx，xx部分就是pid减去10000的结果，是一一对应的关系。
这个10000定义在下列文件中的：AID_APP
android_4.1_src\system\core\include\private\Android_filesystem_config.h
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* This file is used to define the properties of the filesystem
** images generated by build tools (mkbootfs and mkyaffs2image) and
** by the device side of adb.
*/
#ifndef _ANDROID_FILESYSTEM_CONFIG_H_
#define _ANDROID_FILESYSTEM_CONFIG_H_
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
/* This is the master Users and Groups config for the platform.
** DO NOT EVER RENUMBER.
*/
#define AID_ROOT 0 /* traditional unix root user */
#define AID_SYSTEM 1000 /* system server */
#define AID_RADIO 1001 /* telephony subsystem, RIL */
#define AID_BLUETOOTH 1002 /* bluetooth subsystem */
#define AID_GRAPHICS 1003 /* graphics devices */
#define AID_INPUT 1004 /* input devices */
#define AID_AUDIO 1005 /* audio devices */
#define AID_CAMERA 1006 /* camera devices */
#define AID_LOG 1007 /* log devices */
#define AID_COMPASS 1008 /* compass device */
#define AID_MOUNT 1009 /* mountd socket */
#define AID_WIFI 1010 /* wifi subsystem */
#define AID_ADB 1011 /* android debug bridge (adbd) */
#define AID_INSTALL 1012 /* group for installing packages */
#define AID_MEDIA 1013 /* mediaserver process */
#define AID_DHCP 1014 /* dhcp client */
#define AID_SDCARD_RW 1015 /* external storage write access */
#define AID_VPN 1016 /* vpn system */
#define AID_KEYSTORE 1017 /* keystore subsystem */
#define AID_USB 1018 /* USB devices */
#define AID_DRM 1019 /* DRM server */
#define AID_AVAILABLE 1020 /* available for use */
#define AID_GPS 1021 /* GPS daemon */
#define AID_UNUSED1 1022 /* deprecated, DO NOT USE */
#define AID_MEDIA_RW 1023 /* internal media storage write access */
#define AID_MTP 1024 /* MTP USB driver access */
#define AID_NFC 1025 /* nfc subsystem */
#define AID_DRMRPC 1026 /* group for drm rpc */
#define AID_SHELL 2000 /* adb and debug shell user */
#define AID_CACHE 2001 /* cache access */
#define AID_DIAG 2002 /* access to diagnostic resources */
/* The 3000 series are intended for use as supplemental group id's only.
* They indicate special Android capabilities that the kernel is aware of. */
#define AID_NET_BT_ADMIN 3001 /* bluetooth: create any socket */
#define AID_NET_BT 3002 /* bluetooth: create sco, rfcomm or l2cap sockets */
#define AID_INET 3003 /* can create AF_INET and AF_INET6 sockets */
#define AID_NET_RAW 3004 /* can create raw INET sockets */
#define AID_NET_ADMIN 3005 /* can configure interfaces and routing tables. */
#define AID_NET_BW_STATS 3006 /* read bandwidth statistics */
#define AID_NET_BW_ACCT 3007 /* change bandwidth statistics accounting */
#define AID_MISC 9998 /* access to misc storage */
#define AID_NOBODY 9999
#define AID_APP 10000 /* first app user */
#if !defined(EXCLUDE_FS_CONFIG_STRUCTURES)
struct android_id_info {
const char *name;
unsigned aid;
};
static const struct android_id_info android_ids[] = {
{ "root", AID_ROOT, },
{ "system", AID_SYSTEM, },
{ "radio", AID_RADIO, },
{ "bluetooth", AID_BLUETOOTH, },
{ "graphics", AID_GRAPHICS, },
{ "input", AID_INPUT, },
{ "audio", AID_AUDIO, },
{ "camera", AID_CAMERA, },
{ "log", AID_LOG, },
{ "compass", AID_COMPASS, },
{ "mount", AID_MOUNT, },
{ "wifi", AID_WIFI, },
{ "dhcp", AID_DHCP, },
{ "adb", AID_ADB, },
{ "install", AID_INSTALL, },
{ "media", AID_MEDIA, },
{ "drm", AID_DRM, },
{ "available", AID_AVAILABLE, },
{ "nfc", AID_NFC, },
{ "drmrpc", AID_DRMRPC, },
{ "shell", AID_SHELL, },
{ "cache", AID_CACHE, },
{ "diag", AID_DIAG, },
{ "net_bt_admin", AID_NET_BT_ADMIN, },
{ "net_bt", AID_NET_BT, },
{ "sdcard_rw", AID_SDCARD_RW, },
{ "media_rw", AID_MEDIA_RW, },
{ "vpn", AID_VPN, },
{ "keystore", AID_KEYSTORE, },
{ "usb", AID_USB, },
{ "mtp", AID_MTP, },
{ "gps", AID_GPS, },
{ "inet", AID_INET, },
{ "net_raw", AID_NET_RAW, },
{ "net_admin", AID_NET_ADMIN, },
{ "net_bw_stats", AID_NET_BW_STATS, },
{ "net_bw_acct", AID_NET_BW_ACCT, },
{ "misc", AID_MISC, },
{ "nobody", AID_NOBODY, },
};
#define android_id_count \
(sizeof(android_ids) / sizeof(android_ids[0]))
struct fs_path_config {
unsigned mode;
unsigned uid;
unsigned gid;
const char *prefix;
};
/* Rules for directories.
** These rules are applied based on "first match", so they
** should start with the most specific path and work their
** way up to the root.
*/
static struct fs_path_config android_dirs[] = {
{ 00770, AID_SYSTEM, AID_CACHE, "cache" },
{ 00771, AID_SYSTEM, AID_SYSTEM, "data/app" },
{ 00771, AID_SYSTEM, AID_SYSTEM, "data/app-private" },
{ 00771, AID_SYSTEM, AID_SYSTEM, "data/dalvik-cache" },
{ 00771, AID_SYSTEM, AID_SYSTEM, "data/data" },
{ 00771, AID_SHELL, AID_SHELL, "data/local/tmp" },
{ 00771, AID_SHELL, AID_SHELL, "data/local" },
{ 01771, AID_SYSTEM, AID_MISC, "data/misc" },
{ 00770, AID_DHCP, AID_DHCP, "data/misc/dhcp" },
{ 00775, AID_MEDIA_RW, AID_MEDIA_RW, "data/media" },
{ 00775, AID_MEDIA_RW, AID_MEDIA_RW, "data/media/Music" },
{ 00771, AID_SYSTEM, AID_SYSTEM, "data" },
{ 00750, AID_ROOT, AID_SHELL, "sbin" },
{ 00755, AID_ROOT, AID_SHELL, "system/bin" },
{ 00755, AID_ROOT, AID_SHELL, "system/vendor" },
{ 00755, AID_ROOT, AID_SHELL, "system/xbin" },
{ 00755, AID_ROOT, AID_ROOT, "system/etc/ppp" },
{ 00777, AID_ROOT, AID_ROOT, "sdcard" },
{ 00755, AID_ROOT, AID_ROOT, 0 },
};
/* Rules for files.
** These rules are applied based on "first match", so they
** should start with the most specific path and work their
** way up to the root. Prefixes ending in * denotes wildcard
** and will allow partial matches.
*/
static struct fs_path_config android_files[] = {
{ 00440, AID_ROOT, AID_SHELL, "system/etc/init.goldfish.rc" },
{ 00550, AID_ROOT, AID_SHELL, "system/etc/init.goldfish.sh" },
{ 00440, AID_ROOT, AID_SHELL, "system/etc/init.trout.rc" },
{ 00550, AID_ROOT, AID_SHELL, "system/etc/init.ril" },
{ 00550, AID_ROOT, AID_SHELL, "system/etc/init.testmenu" },
{ 00550, AID_DHCP, AID_SHELL, "system/etc/dhcpcd/dhcpcd-run-hooks" },
{ 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/dbus.conf" },
{ 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluetooth/main.conf" },
{ 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluetooth/input.conf" },
{ 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluetooth/audio.conf" },
{ 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/bluetooth/network.conf" },
{ 00444, AID_NET_BT, AID_NET_BT, "system/etc/bluetooth/blacklist.conf" },
{ 00640, AID_SYSTEM, AID_SYSTEM, "system/etc/bluetooth/auto_pairing.conf" },
{ 00444, AID_RADIO, AID_AUDIO, "system/etc/AudioPara4.csv" },
{ 00555, AID_ROOT, AID_ROOT, "system/etc/ppp/*" },
{ 00555, AID_ROOT, AID_ROOT, "system/etc/rc.*" },
{ 00644, AID_SYSTEM, AID_SYSTEM, "data/app/*" },
{ 00644, AID_MEDIA_RW, AID_MEDIA_RW, "data/media/*" },
{ 00644, AID_SYSTEM, AID_SYSTEM, "data/app-private/*" },
{ 00644, AID_APP, AID_APP, "data/data/*" },
/* the following two files are INTENTIONALLY set-gid and not set-uid.
* Do not change. */
{ 02755, AID_ROOT, AID_NET_RAW, "system/bin/ping" },
{ 02750, AID_ROOT, AID_INET, "system/bin/netcfg" },
/* the following five files are INTENTIONALLY set-uid, but they
* are NOT included on user builds. */
{ 06755, AID_ROOT, AID_ROOT, "system/xbin/su" },
{ 06755, AID_ROOT, AID_ROOT, "system/xbin/librank" },
{ 06755, AID_ROOT, AID_ROOT, "system/xbin/procrank" },
{ 06755, AID_ROOT, AID_ROOT, "system/xbin/procmem" },
{ 06755, AID_ROOT, AID_ROOT, "system/xbin/tcpdump" },
{ 04770, AID_ROOT, AID_RADIO, "system/bin/pppd-ril" },
/* the following file is INTENTIONALLY set-uid, and IS included
* in user builds. */
{ 06750, AID_ROOT, AID_SHELL, "system/bin/run-as" },
{ 00755, AID_ROOT, AID_SHELL, "system/bin/*" },
{ 00755, AID_ROOT, AID_ROOT, "system/lib/valgrind/*" },
{ 00755, AID_ROOT, AID_SHELL, "system/xbin/*" },
{ 00755, AID_ROOT, AID_SHELL, "system/vendor/bin/*" },
{ 00750, AID_ROOT, AID_SHELL, "sbin/*" },
{ 00755, AID_ROOT, AID_ROOT, "bin/*" },
{ 00750, AID_ROOT, AID_SHELL, "init*" },
{ 00750, AID_ROOT, AID_SHELL, "charger*" },
{ 00644, AID_ROOT, AID_ROOT, 0 },
};
static inline void fs_config(const char *path, int dir,
unsigned *uid, unsigned *gid, unsigned *mode)
{
struct fs_path_config *pc;
int plen;
pc = dir ? android_dirs : android_files;
plen = strlen(path);
for(; pc->prefix; pc++){
int len = strlen(pc->prefix);
if (dir) {
if(plen < len) continue;
if(!strncmp(pc->prefix, path, len)) break;
continue;
}
/* If name ends in * then allow partial matches. */
if (pc->prefix[len -1] == '*') {
if(!strncmp(pc->prefix, path, len - 1)) break;
} else if (plen == len){
if(!strncmp(pc->prefix, path, len)) break;
}
}
*uid = pc->uid;
*gid = pc->gid;
*mode = (*mode & (~07777)) | pc->mode;
#if 0
fprintf(stderr,"< '%s' '%s' %d %d %o >\n",
path, pc->prefix ? pc->prefix : "", *uid, *gid, *mode);
#endif
}
#endif
#endif
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