c - How to access new files every time when it is added to the directory?

Question

I have a directory by the name of Container which contains the demo.txt file. I am monitoring this Container directory and accessing this demo.txt file but if I copied a new file and tried to access it, I will also have to change the pathname/filename.

I want to automate this process. It means if the new file is added to the Container directory then it should check it automatically without having to give the filename every time. Because so many files are continuously adding every time.

Is it possible this way?

int main(){
    if(access("home/Container/demo.txt", F_OK ) != -1){
        printf("This file already exists in Container");
    }
    else{
        printf("This file does not exist");
    }
    return 0;
}

Answer 1

等待大神答复