Android上运行本地c

在android代码中编译一个可执行文件,主要功能是对文件的读写,

简单贴出来:

#include 
#include 
#include 
#include 
#include 
void read_data(void){
   char readBuf[640*1024];
   char *path = "/boot0_nand";
	FILE* fp= fopen(path,"rb");
	if(!fp){
       printf("can't open %s\n",path);
	}
  size_t len = fread(readBuf,sizeof(char),sizeof(readBuf),fp);
	printf("read len = %d \n",(int)len);
	fclose(fp);  
}
int main(int argc, char** argv) {
	int ret;
	int opt;
  read_data();
}

起初,是用android的编译环境,定义了android.mk文件如下:
include $(CLEAR_VARS)
LOCAL_SRC_FILES := writeBoot/write_boot.c
LOCAL_MODULE := write_boot
LOCAL_FORCE_STATIC_EXECUTABLE := true
LOCAL_MODULE_TAGS := eng
LOCAL_STATIC_LIBRARIES := libstdc++ libc libcutils
include $(BUILD_EXECUTABLE)
编译通过,但是执行到fread的时候,就报错了:Segmentation fault
一直搞不明白,那么简单的代码,就报这个错误!
无奈,实在是没办法,就用gcc来编译,方法如下:
gcc write_boot.c -o write_boot

把write_boot推到小机,修改权限,执行,又报错:not executable: magic 7F45
网上查了一下,通过Android NDK来编译生成,这个比较简单:
编辑一个脚本如下,命名agcc:
#!/bin/sh
OS='linux'
ANDROIDSDK='android-14'
ANDROID='/home/xiongtie/workspace/A31/android41'
PROGDIR='/home/xiongtie/workspace/A31/android41/prebuilts/ndk/android-ndk-r7/'
PROGDIR=`cd $PROGDIR && pwd`
ARMEABIGCC=$ANDROID/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/arm-linux-androideabi-gcc
ARMEABILIB=$PROGDIR/platforms/$ANDROIDSDK/arch-arm/usr/lib
ARMEABIINC=$PROGDIR/platforms/$ANDROIDSDK/arch-arm/usr/include
ARMEABICRT=$PROGDIR/platforms/$ANDROIDSDK/arch-arm/usr/lib/crtbegin_dynamic.o
LINKER=/system/bin/linker
echo "GCC:"$ARMEABIGCC "LIB:"$ARMEABILIB "LINKER":$LINKER "PARAMS:"$@
$ARMEABIGCC $@ -Wl,-rpath-link=$ARMEABILIB,-dynamic-linker=$LINKER -L$ARMEABILIB $ARMEABICRT -I$ARMEABIINC -nostdlib -lc
编译名如下:
./agcc  write_boot.c -o write_boot

再推到小机执行,ok,完成了



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