如何在Android SHELL中运行c++应用程序

I want to run hello world written on C++ and compiled with Android toolchain 9, but I faced with issue: by default I have no permissions to launch it and I can't change permissions using chmod`.

我想运行用c++编写、用Android toolchain 9编译的hello world，但我面临的问题是:默认情况下，我没有启动它的权限，也不能使用chmod '修改权限。

I used Android 2.3.3 - Api Level 10

我使用了Android 2.3.3 - Api级别10

Application was compiled by cross compiler for API level 9

应用程序由API 9级的交叉编译器编译

Procedure:

过程:

Compile application:

编译应用程序:

~/toolchain_andr9/bin/ arm-linux-androideabi-g++ helloworld.cpp

~ / toolchain_andr9 / bin / arm-linux-androideabi-g + + helloworld.cpp

Then send application to SDCARD on the emulator:

然后将应用程序发送到模拟器上的SDCARD:

>adb push a.out /mnt/sdcard

then go to SHELL and try to run a.out:

然后去壳牌，试着跑a。out:

>adb shell
> 
>/mnt/sdcard/a.out

And result is:

结果是:

>`/mnt/sdcard/a.out: permission denied`

command ls -l shows rights for a.out:

命令ls -l显示a.out的权利:

>`----rwxr-x system   sdcard_rw   863656 2012-04-12 22:42 a.out`

I tried to change permissions:

我尝试改变权限:

>chmod 777 /mnt/sdcard/a.out

But rights don't change:

但权利不改变:

>`----rwxr-x system   sdcard_rw   863656 2012-04-12 22:42 a.out`

I think I have left some important thing using android.

我想我在android上留下了一些重要的东西。

Could anybody help me and give me a way how to run application in `Android SHELL?

谁能帮我一个忙，告诉我如何在“Android SHELL”中运行应用程序?

Thanks a lot.

非常感谢。

P.S. sorry for my English =)

对不起，我的英语不好。

2 个解决方案

#1

By default, the SD card is mounted with option noexec, that disallows the execution of any file on the card, no matter what it's permissions(even -rwxrwxrwx), so you need to move the file to another location and then execute it.

默认情况下，SD卡上安装了选项noexec，这将禁止在该卡上执行任何文件，无论该文件具有何种权限(甚至是-rwxrwxrwx)，因此您需要将该文件移动到另一个位置，然后执行它。

The easiest is to move the file to /data/local/tmp/ and execute it using the full path (usual POSIX PATH semantics).

最简单的方法是将文件移动到/data/local/tmp/并使用完整路径(通常是POSIX路径语义)执行它。

> adb push a.out /data/local/tmp/a.out
> adb shell
> chmod 755 /data/local/tmp/a.out
> /data/local/tmp/a.out

This does not require root access and survives reboot.

这并不需要root访问并在重新启动后继续运行。

#2

If you have rooted your phone you can do a mount -o remount,rw /mnt/sdcard and it should run.

如果你的手机已经根了根，你可以安装-o重新安装，rw /mnt/sdcard，它应该会运行。

I've tried it on my Android.

我在我的安卓系统上试过。

#1