client3.c

两个程序

#include<stdio.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>
key_t key,key2;
#define key 18
#define key2 28
#define MSGSIZ 256
FIFE
struct msgbuf2
{
	long mtype;	
	int count;
	char mtext[MSGSIZ];
	float price;
	char name[10];
};

int main()
{
	int msqid1,msqid2;
	float price;
	struct msgbuf2 sndbuf,revbuf;
	while((msqid1=msgget(key,0666))==-1);

 while((msqid2=msgget(key2,0666))==-1);
  

 while(1)
 {
	lockf(sndbuf,1,0);
	lockf(revbuf,1,0);
  printf("buy tickets:");
  scanf("%d",&sndbuf.mtype);
  printf("number:");
  sndbuf.price=0.0;
  sndbuf.name[0]='0';
  scanf("%d",&sndbuf.count);
  if(msgsnd(msqid1,&sndbuf,sizeof(sndbuf)-sizeof(sndbuf.mtype),0)==-1)
  {
	  printf("msg send error\n");
  }
  if(msgrcv(msqid2,&revbuf,sizeof(sndbuf)-sizeof(revbuf.mtype),0,0)==-1)
  {
	  printf("msg receive error!\n");
  }
 if(revbuf.count<0)
 {
	printf("%s",revbuf.mtext);
	continue;
 }
  printf("charge client %f yuan on this trade\n",revbuf.price);
  printf(" tickets %d  %s--------%d tickets  left\n",revbuf.mtype,revbuf.name,revbuf.count);
  lockf(sndbuf,0,0);
  lockf(revbuf,0,0);
 }
  return 0;
}