Run Shell Script file On Android Embedded Device using System function in Android NDK

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Here i want to run .sh file via system call in android NDK.

I able to run cp,rm command via system call. but sh command is not working via system call.

I also installed busy-box on android.I am using below code.I set all permission on test.sh.

Code :

#include <stdlib.h>
#include <stdio.h>
#include <android/log.h>
#include <jni.h>

#define LOG_TAG "Demo"

#define LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)


void Java_com_ndkdemo_NDKdemoActivity_systemcall(JNIEnv * env, jobject obj) {

    int result;

    result = system("cp /mnt/sdcard/test /Download");

    LOGD("result is cp %d", result);

    result = system("sh ./test.sh");

    LOGD("result of test.sh is %d", result);

}

Output :

 result is cp 0.
 result of test.sh is 0.

Here i am getting 0 in system("sh ./test.sh"); but not started the test.sh script.

cant get output "Hi" on console.

test.sh contains

#!/system/bin/
echo "Hi"

If i am executing direct command on prompt than its working fine and its given output "Hi" on console.

Please Help me to figure out this issue.

Thanks

also, FYI: your first line should point to the script you want to run, so should be set to #!/system/bin/sh. — Phil
– Phil, Commented Nov 7, 2012 at 14:43

richq · Accepted Answer · 2012-03-31 15:14:13Z

2

Where are you expecting to see the "echo"? By default, android sends stdout to /dev/null.

According to the documentation you can redirect stdout and stderr to the log (so it will show up in logcat) using the following commands:

$ adb shell stop
$ adb shell setprop log.redirect-stdio true
$ adb shell start

Now you may see your echo in adb logcat.

answered Mar 31, 2012 at 15:14

richq

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2 Comments

user1089679 Over a year ago

Thanks For Your Reply , But without this i cant able to run shell script?

richq Over a year ago

You can run the shell script without doing the stdio redirect, but the echo is lost.

Nikolay Elenkov · Accepted Answer · 2012-03-28 16:15:59Z

0

You might want to try sh -c /full/path/to/test.sh

answered Mar 28, 2012 at 16:15

Nikolay Elenkov

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1 Comment

Nikolay Elenkov Over a year ago

OK. Note that using echo might not be the best way to test this, try using touch or something that creates a file. It's not exactly clear where the stdout of shells you start from NDK are redirected.

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