消息队列

///// send


#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>

#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>

#define MAX_TEXT 1024

struct my_msg_st
{
    
    long int my_msg_type;
    char some_text[MAX_TEXT];
};

 int main(void)
 {
    
     
     struct my_msg_st data;
     int msgid;
     char buffer[MAX_TEXT];
     
     if(-1==(msgid=msgget((key_t)1010,0666 | IPC_CREAT)))
     {
         printf("msgget error!\n");
         exit(0);
     }
          
     while(1)
     {
         printf("Enter Message:");
         gets(buffer);
         data.my_msg_type=1;
         strcpy(data.some_text,buffer);
         if(-1==(msgsnd(msgid,(void*)&data,MAX_TEXT,0)))
         {
             
             printf("message send error\n");
             exit(0);
         }
         if(strcmp(buffer,"end")==0)
             break; 
     }
           
     return 0;
 }





/// receive
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>

#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>

#define MAX_TEXT 1024

struct my_msg_st
{
    
    long int my_msg_type;
    char some_text[MAX_TEXT];
    
};

 int main(void)
 {

     
     struct my_msg_st data;
     int msgid;
     long int msg_to_receive=0;
     
     if((msgid=msgget((key_t)1010,0666 | IPC_CREAT))==-1)
     {
         printf("msgget error!\n");
         exit(0);
     }
          

     while(1)
     {
         if(-1==msgrcv(msgid,(void*)&data,MAX_TEXT,msg_to_receive,0))
         {
             printf("receive error\n");
             exit(0);
         }
             
         printf("MSG:%s\n",data.some_text);
         if(strcmp(data.some_text,"end")==0)
             break; 
     }
     
     return 0;
 }