hi everyone,
I want to execute the command("blkid > filename") in my android-4.3 system ,and the platform is imx6q_sabresd,but I failed to execute the command,because I have not the root permission.so I attempted to root my android-4.3 system as follow:
1.su.c
......
......
int main(int argc, char *argv[])
{
ALOGI("hello !robin-su begin %d !",getuid());
printf("hello !robin-su begin");
int uid=0;
int gid=0;
if(setgid(gid) || setuid(uid)) {
ALOGI("robin su: permission denied\n");
fprintf(stderr,"su: permission denied\n");
return 1;
}
char command[1024];
ALOGI("hello !robin-su end %d !",getuid());
printf("hello !robin-su end");
/* Default exec shell. */
execlp("/system/bin/sh", "sh", NULL);
fprintf(stderr, "su: exec failed\n");
return 1;
}
2.su.h
......
......
3.Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := su
LOCAL_SRC_FILES := su.c
LOCAL_STATIC_LIBRARIES := \
liblog \
libc \
LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
LOCAL_MODULE_TAGS := eng debug
LOCAL_FORCE_STATIC_EXECUTABLE := true
include $(BUILD_EXECUTABLE)
3.compile the su file
$ mkdir -p packages/experimental/su
$ cp su.c su.h Android.mk packages/experimental/su
$ mmm packages/experimental/su
4.apk (MainActivity.java)
......
......
try{
process = Runtime.getRuntime().exec("/system/xbin/su");
os = new DataOutputStream(process.getOutputStream());
os.writeBytes("blkid > /data/local/tmp/label" + "\n");
os.writeBytes("exit\n");
os.flush();
process.waitFor();
} catch (Exception e){
Log.e(LOG_TAG, "===unexpected error===");
}finally {
try {
if(os != null){
os.close();
}
process.destroy();
}catch (Exception e){
}
}
5.apk(Android.mk)
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
# Only compile source java files in this apk.
LOCAL_SRC_FILES := $(call all-java-files-under, src)
LOCAL_PACKAGE_NAME := usb_label
include $(BUILD_PACKAGE)
6.compile apk
$ mkdir -p packages/experimental/usb_label
$ cp su.c su.h Android.mk packages/experimental/usb_label
$ mmm packages/experimental/usb_label
7.compile android-4.3
source build/envsetup.sh
lunch sabresd_6dq-user
make -j8
8.write sd card
dd if=system.img of=/dev/mmcblk0p5;sync
9.start android system
$ mount -o remount,rw /system
$ chmod 4755 system/xbin/su
reboot system again
10.run apk
I failed to execute the the command("blkid > filename"),and get the log:
1)
W/AudioPolicyManagerBase( 2489): getOutput() could not find output for stream 1, samplingRate 0,format 0, channels 3, flags 0
W/AudioPolicyManagerBase( 2489): getOutput() could not find output for stream 1, samplingRate 0,format 0, channels 3, flags 0
W/AudioPolicyManagerBase( 2489): getOutput() could not find output for stream 1, samplingRate 48000,format 1, channels 1, flags 4
2)
robin su: permission denied
11.replace the su file
I found that if I compile the android-4.3 in "eng" mode,the is a "su" file in system/xbin/su,so I replace the new su file into my android-4.3(user mode),and test again.I still failed to get the root permission.and get the same log:
W/AudioPolicyManagerBase( 2489): getOutput() could not find output for stream 1, samplingRate 0,format 0, channels 3, flags 0
W/AudioPolicyManagerBase( 2489): getOutput() could not find output for stream 1, samplingRate 0,format 0, channels 3, flags 0
W/AudioPolicyManagerBase( 2489): getOutput() could not find output for stream 1, samplingRate 48000,format 1, channels 1, flags 4
Is everyone can help me?
Best wishes!
