Question

为什么常说消息队列不安全，会丢失

Answer 1

我用的linuxas4的操作系统，重装了oracle数据库后，以前的老数据文件和里面的文件都不能删除，并且读写和执行的权限都赋权给了oracle和root这两个账号，删除时提示为只读系统文件，请高手指点如何修改文件，能给出相应的命令最好！msgrcv.c内容如下：#include#include#include#include#include#include#include#include#include#defineN10typedefstructstudent{intsno;charsname[15];}STU;typedefstructmsgbuf{longmtype;STUstu[N];}MSGBUF;main(intargc,char*argv[]){inti=0;MSGBUFmbf={0};mbf.mtype=1;intMSQID;errno=0;char*name="./msgaaa";key_tkey=ftok(name,0);MSQID=msgget(key,IPC_CREAT);while(i#include#include#include#include#include#include#include#include#defineN10typedefstructstudent{intsno;charsname[15];}STU;typedefstructmsgbuf{longmtype;STUstu[N];}MSGBUF;main(intargc,char*argv[]){inti=0;MSGBUFmbf={0};mbf.mtype=1;intMSQID;errno=0;char*name="./msgaaa";key_tkey=ftok(name,0);MSQID=msgget(key,IPC_CREAT);while(i