IPC

http://docs.huihoo.com/joyfire.net/11.html#I246

#include<stdio.h>
#include<stdlib.h>
#include<linux/ipc.h>
#include<linux/msg.h>
main()
{
intqid;
key_t msgkey;
struct mymsgbuf
{
longmtype; /*Message type*/
intrequest;/*Work request number*/
doublesalary;/*Employee's salary*/
}msg;

/*Generateour IPC key value*/
msgkey=ftok(".",'m');
/*Open/createthequeue*/
if((qid=open_queue(msgkey))==-1){
perror("open_queue");
exit(1);
}
/*Load up the message with a r bitrary test data*/
msg.mtype=1;/*Messagetypemustbeapositivenumber!*/
msg.request=1;/*Dataelement#1*/
msg.salary=1000.00;/*Data element #2(my yearly salary!)*/
/*Bombsaway!*/
if((send_message(qid,&msg))==-1){
perror("send_message");
exit(1);
}
}