555.c

Linux环境下实现的客户服务器代码

#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;
};
main()
{
 struct msgform msg;
 int msgqid,pid,*pint;
 msgqid=msgget(MSGKEY,0777);
 pid=getpid();

for(;msg.opcode!='q';)
{ printf("a=");
 scanf("%lf",&msg.a);
 printf("b=");
 scanf("%lf",&msg.b);
 printf("(+,-,*,/,q)=");
 msg.opcode=getchar();
 while(msg.opcode=='\n')
    msg.opcode=getchar();
 if(msg.opcode=='q')break;
 if('+'==msg.opcode||'-'==msg.opcode||'*'==msg.opcode||'/'==msg.opcode)
 { msg.mtype=1;
   msg.sender_pid=getpid();
  msgsnd(msgqid,&msg,sizeof(struct msgform),0);
  msgrcv(msgqid,&msg,sizeof(struct msgform),pid,0);
  printf("client:msgqid=%d,receive from pid %d\n",msgqid,msg.sender_pid);
  printf("%lf %c %lf=%lf\n",msg.a,msg.opcode,msg.b,msg.result);
}
  else printf("opcode is error");
}
}