ipc-request-reply-example.c File Reference

IPC Request-Reply Pattern Example. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include "rte/status.h"
#include "rte/log.h"
#include "rte/ipc/rte_ipc_request_reply.h"

Include dependency graph for ipc-request-reply-example.c:

Go to the source code of this file.

Data Structures
struct	signal_query_t
	Query message: Train asks for signal state. More...
struct	signal_reply_t
	Reply message: Signal state and limits. More...

Macros
#define	SIGNAL_RED   0
#define	SIGNAL_YELLOW   1
#define	SIGNAL_GREEN   2

Functions
static rte_status_t	query_signal_database (const signal_query_t *query, signal_reply_t *reply)
	Signal database query logic.
static int	run_signal_server (void)
	Run signal server (responder).
static int	run_train_controller (void)
	Simulate train moving and querying signal state.
int	main (int argc, char *argv[])

Detailed Description

IPC Request-Reply Pattern Example.

Demonstrates synchronous RPC-style communication:

• Client: Train controller queries signal state from database
• Server: Signal database receives query and replies with current state

This is a TWO-PROCESS EXAMPLE. In production, you'd run: Terminal 1: ./signal-server Terminal 2: ./train-controller

Both use IPC Request-Reply for bidirectional communication.

Definition in file ipc-request-reply-example.c.

Macro Definition Documentation

SIGNAL_RED

#define SIGNAL_RED   0

Definition at line 48 of file ipc-request-reply-example.c.

SIGNAL_YELLOW

#define SIGNAL_YELLOW   1

Definition at line 49 of file ipc-request-reply-example.c.

SIGNAL_GREEN

#define SIGNAL_GREEN   2

Definition at line 50 of file ipc-request-reply-example.c.

Function Documentation

query_signal_database()

rte_status_t query_signal_database ( const signal_query_t * query, signal_reply_t * reply )

static

Signal database query logic.

Simulates a real signal database that determines signal state based on track conditions, occupancy, etc.

Definition at line 62 of file ipc-request-reply-example.c.

run_signal_server()

int run_signal_server ( void )

static

Run signal server (responder).

Creates an IPC request-reply server, waits for queries, and responds.

Definition at line 92 of file ipc-request-reply-example.c.

run_train_controller()

int run_train_controller ( void )

static

Simulate train moving and querying signal state.

Definition at line 179 of file ipc-request-reply-example.c.

main()

int main	(	int	argc,
		char *	argv[] )

Definition at line 280 of file ipc-request-reply-example.c.