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