Programming :: Run The Scripts On Remote System Using Plink?

I want to run the scripts on remote system using plink. Here I am using pipes concept .I created two pipes And I want to handle the output and error in two different files. If host key (available in /.putty/sshhostkeys file) is not available or is not match then we will get "Store key in cache? (y/n)" message from child process into error file. If parent process reads this message then we will send "yes" if not then we will continue to next step and parent process will wait until exit child process .

In this bug case, host key did not match and response came late from child process into error file and parent process took it as host key already available and waiting for exit status of child process using waitpid(). But here "yes" did not send for running commands and exit the child process.Hence it is hanged at waitpid(). Please help me how to solve this issue.

I tried this in following way:

#include<stdio.h>
#include <unistd.h>
#include <sys/types.h>

[code]....