message_sending.c

//message sending
#include<stdio.h>
#include<sys/msg.h>
#inlcude<string.h>
struct msgbuf
{
	long mtype;
	char mtext[20];
};

int main(int argc,char *argv[])
{
	int id,ret;
	struct msgbuf v;
	id=msgget(5,IPC_CREAT|0644);
	if(id<0)
	{
		perror("msgget");
		return 0;
	}
	if(argc!=3)
	{
		printf("./a.out msg mtype\n");
		return 0;
	}
	v.mtype=atoi(argv[2]);
	strcpy(v.mtext,argv[1]);
	ret=msgsnd(id,&v,strlen(v.mtext)+1,0);
	if(ret==-1)
	{
		perror("msgsnd");
		return 0;
	}
	printf("message send successfully mtype:%d msg:%s\n",mtype,v.mtext);
}