关于android 调用自己编译的su文件报错的问题

Question

百度加google，自己弄了一个zlsu执行文件，放到system/bin/目录下后，调用它的时候，报错：
java.io.IOException: write failed: EPIPE (Broken pipe)。

Answer 1

su文件代码如下：

 #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>

#include <unistd.h>

void executecmd(char* c);
int exe(int argc, char* argv[]);
int main(int argc, char* argv[])
{
    char* c;
    char* d;
    c = argv[0];
    d = "export CLASSPATH=/data/app/com.zl.movetest-2.apk && export LD_LIBRARY_PATH=/vendor/lib:/system/lib && exec app_process /data/app com.zl.movetest/MoveUtil com.zl.hw 2";
    puts("print cmd: start");
    puts(argv[1]);
    puts(argv[2]);
    puts("print cmd: end");
    printf("%s \n",argv[1]);
    printf("%s \n",argv[2]);
    /*
    puts(c);
    puts(d);
    argv[1] = "-c";
    argv[2] = d;
    executecmd(d);
      return 0;
        return exe(argc,argv);
    */
    return exe(argc,argv);
}

void executecmd(char* c){

        /*
                char Com[80];
        strcpy(Com,"netsh wlan set hostednetwork mode=allow ssid=");
        strcat(Com,u.c_str());
        strcat(Com," key=");                                      
        strcat(Com,k.c_str());
        */
        system(c);

        return;
    }

static int executionFailure(char *context)
{
        fprintf(stderr, "su: %s. Error:%s\n", context, strerror(errno));
        return -errno;
}
static int permissionDenied()
{
        // the superuser activity couldn't be started
        printf("su: permission denied\n");
        return 1;
}

int exe(int argc, char* argv[]){
 struct stat stats;
        struct passwd *pw;
        int uid = 0;
        int gid = 0;

        if(setgid(gid) || setuid(uid)) 
                return permissionDenied();

        char *exec_args[argc + 1];
        exec_args[argc] = NULL;
        exec_args[0] = "sh";
        int i;
        char stra[256];
        sprintf(stra,"%d",argc);
        char coma[80];
                strcpy(coma,"main cmd num : ");
                strcat(coma,stra);
                puts(coma);
        for (i = 1; i < argc; i++)
        {
                exec_args[i] = argv[i];
                char Com[80];
                strcpy(Com,"main cmd: ");
                strcat(Com,exec_args[i]);
                puts(Com);

        }
        execv("/system/bin/sh", exec_args);
        return executionFailure("sh");

}