#include <stdio.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <signal.h>
                                                                                
#define key_in 1234
#define key_out 4321
#define size 1024
static int send_id;
static int receive_id;

int main()
{
	int n,tooutput_id,toinput_id,receive_id,send_id;
	char text[size];

	//key_out as input as this is the msgq where client will send its output
	toinput_id=msgget(key_out, IPC_CREAT);
	if (toinput_id == -1)
	{
		printf("input msgget failed ...\n");
		return -1;
	}

	tooutput_id=msgget(key_in, IPC_CREAT);
	if (tooutput_id == -1)
	{
		printf("output msgq failed ...\n");
		return -1;
	}

	printf("Server ...\n");
	while(1)
	{
		receive_id = msgrcv(toinput_id,text,strlen(text),0,0);
		if(receive_id < 0)
	        {
	                printf("msgrcv failed ...%d\n", errno);
        	        return -1;
	        }

		if(strcmp(text,"quit")==0)
		{
			msgsnd(tooutput_id,text,strlen(text),0);
			printf("<<exiting>>\n");
			msgctl(toinput_id,IPC_RMID,0);
			msgctl(tooutput_id,IPC_RMID,0);
			return 0;
		}
		
		puts(text);
		for (n=0;n<strlen(text);n++)
		{
			text[n]=toupper(text[n]);
		}
		printf("Changed to: ");
		puts(text);

		printf("Server output text %s\n", text);
		send_id = msgsnd(tooutput_id,text,strlen(text),0);
		if(send_id < 0)
	        {
	                printf("msgsend failed ...\n");
        	        return -1;
	        }
	}
	return 0;
}