C使用管道传输数据以使用共享内存写入文件

I am trying to use pipes in C. I have two create two pipes between parent and child process.I have to read a file in chunks of 4096 bytes (or smaller if there is less) and I have to send through the pipes the amount of data that was read and how many times there have been readings. For example, to copy a 6KB file, the parent writes the first 4KB data of the file to the shared memory and send two integers, 1 and 4096, to the child via the pipe. The child receives these two numbers, copies 4096 bytes from the shared memory to the output file, and sends back 1 to the parent via the other pipe. After receiving 1, the parent copies the left 2KB data to the shared memory and send 2 and 2048 to the child. The child receives them from the pipe, copies 2048 bytes to the output file, and replies with 2 to the parent. The parent then send 0, 0 to the child. The child receives 0 and replies with a 0 and then exit. The parent receives 0 and exits too. I am trying to use pipes in C. I have two creat