msg_client.c

Linux大学上机源码学习

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

#include <sys/ipc.h>
#include <sys/msg.h>
#define MSGKEY 75
struct my_msg
  {long mtype;
   char text[256];
  };
main()
{ struct my_msg msgbuf;
  int running=1;
  int msgid;
 long int msg_to_receive=0;
  msgid=msgget(MSGKEY,0777|IPC_CREAT);
  if(msgid==-1)
    { printf("error\n");
      exit(0);
    }
 while(running)
  { printf("enter some text:");
    fgets(msgbuf.text,256,stdin);
    msgbuf.mtype=1; 
   if (msgsnd(msgid,(void*)&msgbuf,256,0)==-1)
       {  printf(" msgsnd error\n");
         exit(0);}
   if (strncmp(msgbuf.text,"end",3)==0)
         running=0;
}
 exit(0);
}