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libipc-old
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libipc-old/examples/pongd.c

170 lines
3.7 KiB
C

#include "../src/ipc.h"
#include <signal.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#define PONGD_SERVICE_NAME "pong"
#define PONGD_VERBOSE
#define PRINTERR(ret,msg) {\
fprintf(stderr, "error while %s: %s\n", msg, ret.error_message);\
}
/**
* ipc_ctx:
* cinfos: array of ipc_connection_info
* pollfd: array of `pollfd` structure
* Both arrays share the same indices.
*/
/**
******************************************************************************
* Overview of the main loop:
* 1. "ctx" pointer declaration (struct ipc_ctx).
* 1. ipc_server_init (ctx, SERVICE_NAME)
******************************************************************************
*/
int cpt = 0;
int verbosity = 1;
struct ipc_ctx *ctx = NULL;
void main_loop ()
{
int base_timer = 10000;
int timer = base_timer;
SECURE_DECLARATION (struct ipc_error, ret);
SECURE_DECLARATION (struct ipc_event, event);
event.type = IPC_EVENT_TYPE_NOT_SET;
while (1) {
// ipc_wait_event provides one event at a time
// warning: event->m is free'ed if not NULL
TEST_IPC_WAIT_EVENT_Q (ipc_events_loop (ctx, &event, &timer), EXIT_FAILURE);
switch (event.type) {
case IPC_EVENT_TYPE_CONNECTION:
{
cpt++;
if (verbosity > 1) {
printf ("connection: %d ctx connected, new client is %d\n", cpt, event.origin);
}
};
break;
case IPC_EVENT_TYPE_DISCONNECTION:
{
cpt--;
if (verbosity > 1) {
printf ("disconnection: %d ctx remaining\n", cpt);
}
};
break;
case IPC_EVENT_TYPE_MESSAGE:
{
struct ipc_message *m = event.m;
if (verbosity > 1) {
if (m->length > 0) {
printf ("message received (type %d, user type %d, size %u bytes): %.*s\n",
m->type, m->user_type, m->length, m->length, m->payload);
} else {
printf ("message with a 0-byte size :(\n");
}
}
ret = ipc_write (ctx, m);
if (ret.error_code != IPC_ERROR_NONE) {
PRINTERR (ret, "server write");
}
};
break;
case IPC_EVENT_TYPE_TIMER:{
printf ("timer\n");
timer = base_timer;
};
break;
case IPC_EVENT_TYPE_ERROR:
{
cpt--;
fprintf (stderr, "a problem happened with client %d (now disconnected)", event.origin);
fprintf (stderr, ", %d ctx remaining\n", cpt);
};
break;
case IPC_EVENT_TYPE_TX:
{
if (verbosity > 1) {
printf ("a message was sent\n");
}
}
break;
default:
{
fprintf (stderr, "there must be a problem, event not set\n");
};
}
}
// should never go there
exit (EXIT_FAILURE);
}
void exit_program (int signal)
{
printf ("Quitting, signal: %d\n", signal);
// the application will shut down, and close the service
struct ipc_error ret = ipc_close_all (ctx);
if (ret.error_code != IPC_ERROR_NONE) {
PRINTERR (ret, "server close");
}
ipc_ctx_free (ctx);
free (ctx);
exit (EXIT_SUCCESS);
}
/*
* service ping-pong: send back everything sent by the ctx
* stop the program on SIG{TERM,INT,ALRM,USR{1,2},HUP} signals
*/
int main (int argc, char *argv[])
{
if (argc > 1) {
verbosity = atoi(argv[1]);
}
printf ("pid = %d\n", getpid ());
ctx = malloc (sizeof (struct ipc_ctx));
memset (ctx, 0, sizeof (struct ipc_ctx));
struct ipc_error ret = ipc_server_init (ctx, PONGD_SERVICE_NAME);
if (ret.error_code != IPC_ERROR_NONE) {
PRINTERR (ret, "server init");
return EXIT_FAILURE;
}
printf ("Listening on %s.\n", ctx->cinfos[0].spath);
printf ("MAIN: server created\n");
signal (SIGHUP, exit_program);
signal (SIGALRM, exit_program);
signal (SIGUSR1, exit_program);
signal (SIGUSR2, exit_program);
signal (SIGTERM, exit_program);
signal (SIGINT, exit_program);
// the service will loop until the end of time, or a signal
main_loop ();
// main_loop should not return
return EXIT_FAILURE;
}