server.c

一个详细的通信程序

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/msg.h>
#include <string.h>
#define BUFFER 255

struct msgtype { 
 long mtype; 
 char buffer[BUFFER+1]; 
}; 
int main()
{
 struct msgtype msg;
 key_t key;
 int msgid;

 key=777;

 if((msgid=msgget(key,IPC_CREAT|IPC_EXCL))==-1)
 {
  fprintf(stderr,"Creat Message Error\n");
  exit(1);
 }
 while(1)
 {
  msgrcv(msgid,&msg,sizeof(struct msgtype),1,0);
  fprintf(stdout,"Server Receive:%s\n",msg.buffer);
  msg.mtype=2;
  msgsnd(msgid,&msg,sizeof(struct msgtype),0);
 }
 exit(0);
}