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

186 lines
4.2 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) {\
const char * err = ipc_errors_get (ret);\
fprintf(stderr, "error while %s: %s\n", msg, err);\
}
int cpt = 0;
struct ipc_connection_info *srv = NULL;
struct ipc_connection_infos *clients = NULL;
void main_loop ()
{
enum ipc_errors ret = 0;
clients = malloc (sizeof (struct ipc_connection_infos));
memset(clients, 0, sizeof(struct ipc_connection_infos));
struct ipc_event event;
memset(&event, 0, sizeof (struct ipc_event));
event.type = IPC_EVENT_TYPE_NOT_SET;
while(1) {
// ipc_service_poll_event provides one event at a time
// warning: event->m is free'ed if not NULL
// printf ("before wait event\n"); // TODO remove
ret = ipc_wait_event (clients, srv, &event);
// printf ("after wait event\n"); // TODO remove
if (ret != IPC_ERROR_NONE && ret != IPC_ERROR_CLOSED_RECIPIENT) {
PRINTERR(ret,"service poll event");
// the application will shut down, and close the service
ret = ipc_server_close (srv);
if (ret != IPC_ERROR_NONE) {
PRINTERR(ret,"server close");
}
exit (EXIT_FAILURE);
}
switch (event.type) {
case IPC_EVENT_TYPE_CONNECTION:
{
cpt++;
#ifdef PONGD_VERBOSE
printf ("connection: %d clients connected, new client is %d\n"
, cpt, (event.origin)->fd);
#endif
};
break;
case IPC_EVENT_TYPE_DISCONNECTION:
{
cpt--;
#ifdef PONGD_VERBOSE
printf ("disconnection: %d clients remaining\n", cpt);
#endif
// free the ipc_client structure
free (event.origin);
};
break;
case IPC_EVENT_TYPE_MESSAGE:
{
struct ipc_message *m = event.m;
#ifdef PONGD_VERBOSE
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");
}
#endif
ret = ipc_write (event.origin, m);
if (ret != IPC_ERROR_NONE) {
PRINTERR(ret,"server write");
}
printf ("message sent\n");
};
break;
case IPC_EVENT_TYPE_ERROR:
{
cpt--;
fprintf (stderr, "a problem happened with client %d (now disconnected)", (event.origin)->fd);
fprintf (stderr, ", %d clients remaining\n", cpt);
// free the ipc_client structure
free (event.origin);
};
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);
// free remaining clients
for (size_t i = 0; i < clients->size ; i++) {
struct ipc_connection_info *cli = clients->cinfos[i];
if (cli != NULL) {
free (cli);
}
clients->cinfos[i] = NULL;
}
ipc_connections_free (clients);
free (clients);
// the application will shut down, and close the service
enum ipc_errors ret = ipc_server_close (srv);
if (ret != IPC_ERROR_NONE) {
PRINTERR(ret,"server close");
}
free (srv);
exit(EXIT_SUCCESS);
}
/*
* service ping-pong: send back everything sent by the clients
* stop the program on SIG{TERM,INT,ALRM,USR{1,2},HUP} signals
*/
int main(int argc, char * argv[], char **env)
{
argc = argc; // warnings
argv = argv; // warnings
printf ("pid = %d\n", getpid ());
srv = malloc (sizeof (struct ipc_connection_info));
if (srv == NULL) {
exit (EXIT_FAILURE);
}
memset (srv, 0, sizeof (struct ipc_connection_info));
srv->type = '\0';
srv->index = 0;
srv->version = 0;
srv->fd = 0;
srv->spath = NULL;
enum ipc_errors ret = ipc_server_init (env, srv, PONGD_SERVICE_NAME);
if (ret != IPC_ERROR_NONE) {
PRINTERR(ret,"server init");
return EXIT_FAILURE;
}
printf ("Listening on %s.\n", srv->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;
}