The QNX Operating System

Listing 1 (message.h)

/***********************************************************
***
***    This header file contains the definitions that are
***    used by the sender.c (<a href="/showArticle.jhtml?documentID=cuj9109busigin&pgno=3">listing 2</a>) and holder.c
***    (<a href="/showArticle.jhtml?documentID=cuj9109busigin&pgno=4">listing 3</a>) programs.
***
***********************************************************/

/*
   HOLDER_NAME defines the name that this program will
   register with the operating system. sender.c will
   determine the task id of this program by using the
   name_locate function.
*/

#define HOLDER_NAME     "holder"

/*
   The following manifests define the types of messages
   that will be assigned to the .mssg_type field of the
   following structure.
*/

#define STORE          1
#define STORED         10
#define RETRIEVE       2
#define RETRIEVED      20
#define KILL           3
#define ERROR          -1

#define MAX_MSG_SIZE  81

struct message {
   int mssg_type;
   char text[MAX_MSG_SIZE];
   };