parentchild_pipe on windows in C

build.sh

#!/usr/bin/env sh
zig cc -target x86_64-windows parent.c -o parent.exe
zig cc -target x86_64-windows child.c -o child.exe

child.c

#include<stdio.h>
#include<windows.h> // windows.h
#define BUFFER_SIZE 25
int main(void){
   HANDLE read_handle;
   CHAR buffer[BUFFER_SIZE];
   DWORD read;
   /* getting the read handle of the pipe */
   read_handle = GetStdHandle(STD_INPUT_HANDLE);
   /* the child reads from the pipe */
   if (ReadFile(read_handle, buffer, BUFFER_SIZE, &read, NULL))
      printf("child read %s", buffer);
   else
      fprintf(stderr, "Error reading from pipe");
   return 0;
}

parent.c

#include<stdio.h>
#include<stdlib.h>
#include<windows.h> // windows.h
#define BUFFER_SIZE 25

int main(void){
  HANDLE read_handle, write_handle;
  STARTUPINFO si;
  PROCESS_INFORMATION pi;
  char message[BUFFER_SIZE] = "Greetings";
  DWORD written;
  // security attributes to allow pipes to be inherited
  SECURITY_ATTRIBUTES sa = {sizeof(SECURITY_ATTRIBUTES), NULL, TRUE};
  // docs show zeroing out of startup and process information
  // https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src/ProcThread/creating-processes.md
  ZeroMemory(&si, sizeof(si));
  ZeroMemory(&pi, sizeof(pi));
  if (!CreatePipe(&read_handle, &write_handle, &sa, 0)) {
      fprintf(stderr, "Create Pipe Failed"); return 1;
  }
  GetStartupInfo(&si); // start info struct for child process
  si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
  // redirect stdin to read end of pipe
  si.hStdInput = read_handle;

  // replace all handles all of the handles instead of connecting to them
  si.dwFlags = STARTF_USESTDHANDLES;
  SetHandleInformation(write_handle, HANDLE_FLAG_INHERIT, 0);
  CreateProcess(NULL, "child.exe", NULL, NULL, TRUE, /* inherit handles */ 0, NULL, NULL, &si, &pi);
  CloseHandle(read_handle); // close unused end of pipe

  if(!WriteFile(write_handle, message, BUFFER_SIZE, &written, NULL))
      fprintf(stderr, "Error writing to pipe.");

  WaitForSingleObject(pi.hProcess,INFINITE); //wait for the child to exit

  CloseHandle(pi.hProcess);
  CloseHandle(pi.hThread);
  return 0;
}