android下的c程序

http://blog.youkuaiyun.com/luoshengyang/article/details/6571210

1 源代码

derek@u10:~/ics/ics-4.0.4/external/hello$ ls
Android.mk  hello.c

hello.c

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#define DEVICE_NAME "/dev/hello"
int main(int argc, char** argv)
{
	int fd = -1;
	int val = 0;
	fd = open(DEVICE_NAME, O_RDWR);
	if(fd == -1) {
		printf("Failed to open device %s.\n", DEVICE_NAME);
		return -1;
	}
	
	printf("Read original value:\n");
	read(fd, &val, sizeof(val));
	printf("%d.\n\n", val);
	val = 5;
	printf("Write value %d to %s.\n\n", val, DEVICE_NAME);
        write(fd, &val, sizeof(val));
	
	printf("Read the value again:\n");
        read(fd, &val, sizeof(val));
        printf("%d.\n\n", val);
	close(fd);
	return 0;
}

Android.mk  

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional
LOCAL_MODULE := hello
LOCAL_SRC_FILES := $(call all-subdir-c-files)

include $(BUILD_EXECUTABLE)

2 编译

derek@u10:~/ics/ics-4.0.4/$ .  ./build/envsetup.sh

derek@u10:~/ics/ics-4.0.4/$ mmm ./external/hello

derek@u10:~/ics/ics-4.0.4/$ make snod

3 运行虚拟机，测试bin文件

derek@u10:~/ics/ics-4.0.4$ adb shell
# 
# cd /bin
cd: can't cd to /bin
# hello
Read original value:
5.

Write value 5 to /dev/hello.

Read the value again:
5.