client.c

一个详细的通信程序

#include <stdio.h>
#include <unistd.h>
#include <sys/msg.h>
#include <sys/types.h>
#define BUFFER 255
struct msgtype {
 long mtype;
 char buffer[BUFFER+1];
};
int main(int argc,char **argv)
{
 struct msgtype msg;
 key_t key;
 int msgid;
 int errno;
  
if(argc!=2)
 {
  fprintf(stderr,"Usage:%s string\n\a",argv[0]);
  exit(1);
 }

key=777;

 if((msgid=msgget(key,IPC_EXCL))==-1)
 {
  fprintf(stderr,"Creat Message Error\n");
  exit(1);
 }

 msg.mtype=1;
 strncpy(msg.buffer,argv[1],BUFFER);
 msgsnd(msgid,&msg,sizeof(struct msgtype),0);
 memset(&msg,'\0',sizeof(struct msgtype));
 msgrcv(msgid,&msg,sizeof(struct msgtype),2,0);
 fprintf(stderr,"Client receive:%s\n",msg.buffer);
 exit(0);
}