wait_pid.cpp

#include <stdlib.h> // NULL
#include <stdbool.h> // false
#include <windows.h> // AttachConsole, CTRL_C_EVENT, etc.
#include <stdio.h> // printf

#include <strsafe.h>
void logLastError() 
{ 
    LPTSTR errorText = NULL;
    
    FormatMessage(
       // use system message tables to retrieve error text
       FORMAT_MESSAGE_FROM_SYSTEM
       // allocate buffer on local heap for error text
       |FORMAT_MESSAGE_ALLOCATE_BUFFER
       // Important! will fail otherwise, since we're not 
       // (and CANNOT) pass insertion parameters
       |FORMAT_MESSAGE_IGNORE_INSERTS,  
       NULL,    // unused with FORMAT_MESSAGE_FROM_SYSTEM
       GetLastError(),
       MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
       (LPTSTR)&errorText,  // output 
       0, // minimum size for output buffer
       NULL);   // arguments - see note 
       
    if ( NULL != errorText )
    {
       printf("failure: %s", errorText);
       LocalFree(errorText);
       errorText = NULL;
    }
}

void WaitProgram(int pid)
{
     HANDLE h=OpenProcess(SYNCHRONIZE , TRUE, pid);
     if (!h) {
         logLastError();
     }
     printf("waiting for pid %d", pid);
     WaitForSingleObject(h, INFINITE );
}

int main( int argc, const char* argv[] ) {
    // assume they know the pid...
    if (argc != 2) {
        printf("syntax: pid");
        return 1;
    }
    int pid = atoi(argv[1]);
    WaitProgram(pid);
}