linux lua

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "include/lua.hpp"
bool g_bQuit = false;
void SignalHandler(int signal)
{
 printf("nanny thread was interrupt by signal\n");
 g_bQuit = true;
}
//for lua
//Ö´Ðд«À´µÄ×Ö·û´®,·µ»Ø½á¹û
static int NannyCreateProcess(lua_State* L)
{
 const char* param = lua_tostring(L,1);
 int ret = system(param);
 lua_pushnumber(L, ret);
 return 1;
}
void DoLuaCheck(lua_State* L, char* szBuf)
{
 lua_getglobal(L, "NannyCheckPsString");
 lua_pushstring(L, szBuf);
 lua_call(L, 1, 0);
}
void DoLuaReset(lua_State* L)
{
 lua_getglobal(L, "NannyTryReloadProcess");
 lua_call(L, 0, 0);
}
lua_State* InitLua()
{
 lua_State* L = lua_open();
 luaopen_base(L);
 luaL_openlibs(L);
 
 lua_register(L, "NannyCreateProcess", NannyCreateProcess);
 luaL_dofile(L, "nanny.lua");
 return L;
}
bool DoCheck()
{
 int fd[2];
 
 if( pipe(fd) < 0 )
 {
  fprintf(stderr, "failed to create pipe! (%s)\n", strerror(errno));
  return false;
 }
 
 int nRet = fork();
 if( nRet > 0 )
 {
  //¶ÁÈ¡¹ÜµÀÖÐpsÊä³ö
  lua_State* L = InitLua();
  if( L == NULL )
   return false;
  close(fd[1]);
  FILE* fp = fdopen(fd[0], "r");
  if( fp == NULL )
  {
   lua_close(L);
   return false;
  }
  char szBuf[2048] = { 0 };
  while( fgets(szBuf, 2048, fp) != NULL )
  {
   DoLuaCheck(L, szBuf);
   //fprintf(stderr, "-----------%s",szBuf);
   memset(szBuf,  0, 2048);