mount and run script on external sd

gistfile1.c

#include <sys/mount.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>


int main(int argc,char **argv)
{
        int fd;
        struct stat s;

        if(mount("/dev/block/mmcblk1p1","/extsd","vfat",0,NULL)){
                printf("mount fail!\n");
                return 0;
        }

        if(stat("/extsd/ss.sh",&s)==0)
        {
                char *a[]={"/extsd/sh","/extsd/ss.sh",NULL};
                execv("/extsd/sh",a);
        }

 
umountexit:
        //===umount and exit
        umount("/extsd");
        return 0;
}