application program code for driver development of orange pi win

Sandeshhs

This is the application program code for driver development of orange pi win ...can anyone explain the logic of the program

#include<stdio.h>

#include<sys/types.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<string.h>

int main(int argc, char *argv[])

{

int cnt, fd;

char buf[32]= {0};

if(argc !=2)

{

   Printf(“Usage : %s</dev/xxx>\r\n”, argv[0]);

Return -1;

}

fd = open (argv[1], 0_RDWR);

if(fd <  0)

{

printf(“APP Error  pen device is Failed!\r\n”);

return -1;

}

read(fd, buf, sizeof(buf));

printf(“buf = %s\r\n”, buf);

close(fd);

return 0;

}

Sandeshhs

thank u......