linux 執行命令行，獲取結果

 

 
 char strcmd[256] = {0};
 snprintf(strcmd,sizeof(strcmd)-1, "ls -l %s",m_logpath);
 FILE *pf  = popen(strcmd,"r");
 if( NULL == pf)
 {
  ERROR("NULL == pf\n");
  return ;
 }
 char str[1024]={0};
 int count = fread(str,1,sizeof(str)-1,pf);
 //文件不存在
 if(0 == count)
 {
  getLock();
  if(NULL != pfp)
  {
   fflush(pfp);
   pfp = NULL;
  }
  releaseLock();
 }
 else
 {
  char *psubstr = strtok(str," ");
  int columns = 0;
  while(NULL != psubstr)
  {   columns++;
  if(5 == columns)//第5列是文件的大小
  {
   long filesize = atol(psubstr);
   // 日誌已經達到最大值。
   if (LHUConfig::GetConfigNumValue(LOGFILE_MAX_SIZE) < filesize)
   {
    char baklogpath[256]= {0};
    strncpy(baklogpath,m_logpath,strlen(m_logpath)-4);
    snprintf(strcmd,sizeof(strcmd)-1, "mv %s %s_%s.log",m_logpath,baklogpath,CURTIME);//CURTIME
    getLock();
    if(NULL != pfp)
    {
     fflush(pfp);
     int ret = system(strcmd);
     if (0 != ret)
     {
      releaseLock();
      ERROR("exec %s error[%d] ! \n ",strcmd,ret);
      return;
     }
     fclose(pfp);
     pfp = NULL;
    }
    releaseLock();
   }
   break;
  }
  psubstr = strtok(NULL," ");
  }      

 }