根据ptrace手册页，IfthePTRACE_O_TRACEEXECoptionisnotineffect,allsuccessfulcallstoexecve(2)bythetracedprocesswillcauseittobesentaSIGTRAPsignal,givingtheparentachancetogaincontrolbeforethenewprogrambeginsexecution.如果选项是有效，Stopthetraceeatthenextexecve(2).Awaitpid(2)bythetracerwillreturnastatusvaluesuchth