msgget():The msgget function can be used to create the message queue. msgrcv():The msgrcv function can be used to receive the messages. msgsnd():The msgsnd function can be used to send the messages to another process
#include <stdio.h>
#include <sys/ipc.h>
#include <fcntl.h>
#define MAX 255
struct mesg
{
long type;
char mtext[MAX];
}
*mesg;
char buff[MAX];
main()
{
int mid,fd,n,count=0;;
if((mid=msgget(1006,IPC_CREAT | 0666))<0)
{
printf(“\n Can‟t create Message Q”);
exit(1);
}
printf(“\n Queue id:%d”, mid);
mesg=(struct mesg *)malloc(sizeof(struct mesg));
mesg ->type=6;
fd=open(“fact”,O_RDONLY);
while(read(fd,buff,25)>0)
{
strcpy(mesg ->mtext,buff);
if(msgsnd(mid,mesg,strlen(mesg ->mtext),0)== -1)
printf(“\n Message Write Error”);
}
if((mid=msgget(1006,0))<0)
{
printf(“\n Can‟t create Message Q”);
exit(1);
}
while((n=msgrcv(mid,&mesg,MAX,6,IPC_NOWAIT))>0)
write(1,mesg.mtext,n);
count ;
if((n= = -1)&(count= =0))
printf(“\n No Message Queue on Queue:%d”,mid);
}