#include <sys/types.h>#include <sys/wait.h>#include "error.h"#include "haswaitp.h"#ifdef HASWAITPIDint wait_pid(wstat,pid) int *wstat; int pid;{  int r;  do    r = waitpid(pid,wstat,0);  while ((r == -1) && (errno == error_intr));  return r;}#else/* XXX untested *//* XXX breaks down with more than two children */static int oldpid = 0;static int oldwstat; /* defined if(oldpid) */int wait_pid(wstat,pid) int *wstat; int pid;{  int r;  if (pid == oldpid) { *wstat = oldwstat; oldpid = 0; return pid; }  do {    r = wait(wstat);    if ((r != pid) && (r != -1)) { oldwstat = *wstat; oldpid = r; continue; }  }  while ((r == -1) && (errno == error_intr));  return r;}#endif