简单的Linux 消息队列测试代码:
/*msg_block_read.c*/
#include <sys/types.h>
#include <sys/msg.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
struct msg_buf
{
int mtype;
// char aaa[255]; //此结构体只能包含两个成员
char data[255];
};
int main()
{
key_t key;
int msgid;
int ret;
struct msg_buf msgbuf;
key=ftok("/tmp/2",'a');
printf("key =[%x]\n",key);
msgid=msgget(key,IPC_CREAT|0666); /*Íš¹ýÎÄŒþ¶ÔÓŠ*/
if(msgid==-1)
{
printf("create error\n");
return -1;
}
/*
msgbuf.mtype = getpid();
strcpy(msgbuf.data,"test haha, aaaaaaaaaaaaaaaaaa");
ret=msgsnd(msgid,&msgbuf,strlen(msgbuf.data),0);
if(ret==-1)
{
printf("send message err\n");
return -1;
}
*/
memset(&msgbuf,0,sizeof(msgbuf));
ret=msgrcv(msgid,&msgbuf,sizeof(msgbuf.data),0,0); //阻塞读取，第一个消息
if(ret==-1)
{
printf("recv message err\n");
return -1;
}
printf("recv msg =[%s], len = %d\n",msgbuf.data, strlen(msgbuf.data));
}
/*msg_block_write.c*/
#include <sys/types.h>
#include <sys/msg.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
struct msg_buf
{
int mtype;
// char aaa[255]; //此结构体只能包含两个成员
char data[255];
};
int main()
{
key_t key;
int msgid;
int ret;
struct msg_buf msgbuf;
key=ftok("/tmp/2",'a');
printf("key =[%x]\n",key);
msgid=msgget(key,IPC_CREAT|0666); /*Íš¹ýÎÄŒþ¶ÔÓŠ*/
if(msgid==-1)
{
printf("create error\n");
return -1;
}
msgbuf.mtype = getpid();
strcpy(msgbuf.data,"test haha, aaaaaaaaaaaaaaaaaa");
ret=msgsnd(msgid,&msgbuf,strlen(msgbuf.data),0); // 阻塞发送
if(ret==-1)
{
printf("send message err\n");
return -1;
}
/*
memset(&msgbuf,0,sizeof(msgbuf));
ret=msgrcv(msgid,&msgbuf,sizeof(msgbuf.data),getpid(),0);
if(ret==-1)
{
printf("recv message err\n");
return -1;
}
printf("recv msg =[%s], len = %d\n",msgbuf.data, strlen(msgbuf.data));
*/
}