printf Disable Caching method

After deploying an application to Jenkins, it was found that the console output could not display the full log, because of printf caching. Caching can be prevented by the following command, so that the updated output string can be displayed on the terminal as soon as possible: Setvbuf (stdout,null,_ionbf,0); Directly prohibit the cache, put at the beginning of the program, the entire project to prohibit the caching of functions fflush (stdout); When you need to force a flush cache, call Fflush to flush the buffer at once, outputting the cached string immediately