signalcs1.c

操作系统的一些实验

#include<stdio.h>
#include<sys/types.h>
#include<sys/msg.h>
#include<sys/ipc.h>

#define MSGKEY 75

struct msgform
{
	long mtype;
	char mtext[1030];
}msg;
int msgpid,i;

void CLIENT()
{
	int i;
	msgpid=msgget(MSGKEY,0777);
	for(i=10; i>=1; i--)
	{
		msg.mtype=i;
		printf("(client)sent\n");
		msgsnd(msgpid,&msg,1024,0);
	}
	exit(0);
}

void SERVER()
{
	msgpid=msgget(MSGKEY,0777|IPC_CREAT);
	do {
		msgrcv(msgpid,&msg,1030,0,0);
		printf("(server)received\n");
	}while(msg.mtype !=1);
	msgctl(msgpid,IPC_RMID,0);
	exit(0);
}

int main()
{
	while((i=fork())==-1);
	printf("server created successful!  ");
	if(!i) SERVER();

	while((i=fork())==-1);
	printf("client created successful!\n");
	if(!i) CLIENT();

	wait(0);
	wait(0);

	return 0;
}