单一消息队列完成客户-服务器进程间的双向通信

本文主要是介绍单一消息队列完成客户-服务器进程间的双向通信，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

单一消息队列完成客户—服务器进程间的双向通信,客户端接收输入字符串，如接收到的是exit字符串，直接退出，否则传送接收字符串到服务器端，并等待服务器端回传消息。服务器端：接收客户端请求，接收后将接收到的字符串逆序后回传到对应客户端。

//服务器端：
#include<sys/msg.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<stdio.h>
#include<sys/errno.h>
#include<string.h>
extern int errno;
struct mymsgbuf1
{long mtype;char ctext[100];
};
struct mymsgbuf
{long mtype;pid_t pid;char ctext[100];
};
void main(){struct mymsgbuf buf;struct mymsgbuf1 buf1;int msgid,ret,i,len;if((msgid = msgget(0x1234,0666|IPC_CREAT))<0){fprintf(stderr,"openmsg%xfailed.\n",0x1234);return;}while(1){memset(&buf,0,sizeof(buf));while((ret = msgrcv(msgid,&buf,sizeof(buf.ctext)+sizeof(buf.pid),1,0))<0){if(errno == EINTR)continue;return;}fprintf(stderr,"Receivemessageform%d,content:%s\n",buf.pid,buf.ctext);memset(&buf1,0,sizeof(buf1));//strcpy(buf1.ctext,buf.ctext);len=strlen(buf.ctext)for(i = 0;i < len;i++){buf1.ctext[len-1-i] = buf.ctext[i];}buf1.mtype = buf.pid;while((msgsnd(msgid,&buf1,strlen(buf1.ctext),0))<0){if(errno == EINTR)continue;return;}}
}
//客户端：
#include<sys/msg.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<stdio.h>
#include<sys/errno.h>
#include<string.h>
extern int errno;
struct tmymsgbuf1
{longmtype;charctext[100];
};
struct mymsgbuf
{long mtype;pid_t pid;char ctext[100];
};
void main()
{struct mymsgbuf buf;struct mymsgbuf1 buf1;int msgid,ret;pid_t pid = getpid();if((msgid = msgget(0x1234,0666|IPC_CREAT))<0){fprintf(stderr,"openmsg%xfailed.\n",0x1234);return;}while(1){memset(&buf,0,sizeof(buf));fgets(buf.ctext,sizeof(buf.ctext),stdin);if(!strcmp(buf.ctext,"exit"))break;buf.mtype = 1;buf.pid = pid;while((msgsnd(msgid,&buf,strlen(buf.ctext)+sizeof(buf.pid),0))<0){if(errno == EINTR)continue;return;}memset(&buf1,0,sizeof(buf1));while((ret = msgrcv(msgid,&buf1,sizeof(buf1.ctext),pid,0))<0){if(errno == EINTR)continue;return;}fprintf(stderr,"Receivemessageformservercontent:%s\n",buf1.ctext);}
}