An examination of the CRT in windows.

crttest.c

#include <Windows.h>

#define BUFFER_SIZE 4096

DWORD write( HANDLE out, const char* buf );
DWORD read( HANDLE in, char* buf, int bufSize );

int CALLBACK WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ) 
{
  DWORD dwThreadID; 
  DWORD dwProcessID;
  HANDLE stdout;
  HANDLE stdin;
  HANDLE hProcess;
  HANDLE hThread;
  char userBuf[BUFFER_SIZE];
	
  /* Allocate console and verify */
  if( !AllocConsole() ) {
    return 1;
  }
	
  /* Open self */
  dwThreadID = GetCurrentThreadId();
  dwProcessID = GetCurrentProcessId();
  hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessID );
  hThread = OpenThread( THREAD_ALL_ACCESS, FALSE, dwThreadID );
	
  /* Verify */
  if( hProcess == NULL || hThread == NULL ) {
    return 2;
  }

  /* Acquire standard handles */
  stdin = GetStdHandle(STD_INPUT_HANDLE);
  stdout = GetStdHandle(STD_OUTPUT_HANDLE);
	
  /* Output */
  sprintf(userBuf, "Current Process:\n pid: %i tid: %i\n", dwProcessID, dwThreadID);
  write(stdout, userBuf);
  read(stdin, userBuf, sizeof userBuf);
	
  /* Close handles and exit */
  CloseHandle(hThread);
  CloseHandle(hProcess);
  return 0;
}

DWORD write( HANDLE out, const char* buf ) {
  DWORD written;
  WriteConsole(out, buf, strlen(buf), &written, NULL);
  return written;
}

DWORD read( HANDLE in, char* buf, int bufSize ) {
  DWORD read;
  ReadConsole(in, buf, sizeof buf, &read, NULL);
  return read;
}

makefile

crttest : crttest.c
	cl crttest.c /Facrttest.asm /Fmcrttest.map
	dumpbin /disasm:bytes /relocations crttest.exe > crttest.disasm
	
clean:
	erase /s /q crttest.exe crttest.obj crttest.asm crttest.disasm crttest.map