666.c

来自「Linux环境下实现的客户服务器代码」· C语言 代码 · 共 46 行

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define MSGKEY 75
struct msgform
{
 long mtype;
 char mtext [256];
 double a,b,result;
 char opcode;
 int sender_pid;
}msg;
int msgqid;
main()
{
 int i,pid,*pint;
 extern cleanup();
 for(i=0;i<20;i++)
 signal(i,cleanup);
 msgqid =msgget(MSGKEY,0777|IPC_CREAT);
 for(;;)
 { 
  msgrcv(msgqid,&msg,sizeof(struct msgform),1,0);
  switch(msg.opcode)
   {case'+': {msg.result=msg.a+msg.b;break;}
    case'-': {msg.result=msg.a-msg.b;break;}
    case'*': {msg.result=msg.a*msg.b;break;}
    case'/': {if(msg.b==0){printf("the msg.b is error");break;}
           else {msg.result=msg.a/msg.b;
                break;}}
    case'q': {printf("the opcode is error!");break;}
    }
   msg.mtype=msg.sender_pid;
   msg.sender_pid=getpid();
  printf("server:receive from pid %d\n",msg.mtype);
 
 msgsnd(msgqid,&msg,sizeof(struct msgform),0);
}
}
cleanup()
{msgctl(msgqid ,IPC_RMID,0);
 exit();
}