libipc-examples/c/pongd.c

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2.6 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <libipc.h>
#define SERVICE "pong"
#define SERVICE_LEN 4
#define MAX_MSG_SIZE 10000
int err(void *ctx, char *msg) {
printf("error: %s\n", msg);
printf("Free context\n");
ipc_context_deinit (&ctx);
return 1;
}
int main(int argc, char**argv) {
int ret = 0;
int servicefd = 0;
char message[MAX_MSG_SIZE];
size_t size = MAX_MSG_SIZE;
char event_type;
size_t index = 0;
int originfd = 0;
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int newfd = 0;
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void *ctx = NULL;
int max_count = 0;
if (argc > 1) {
max_count = atoi(argv[1]);
printf ("Wait for %d timer events.\n", max_count);
}
printf ("Init context.\n");
ret = ipc_context_init (&ctx);
if (ret != 0) {
printf ("Cannot init context.\n");
return 1;
}
printf ("Create a 'pong' service.\n");
ret = ipc_service_init (ctx, &servicefd, SERVICE, SERVICE_LEN);
if (ret != 0) {
return err (ctx, "Cannot create a service.");
}
printf ("Set the timer to two seconds.\n");
ipc_context_timer (ctx, 2000);
printf ("Loop over events.\n");
char should_continue = 1;
size_t count = 0;
size_t count_timer = 0;
while(should_continue) {
size = MAX_MSG_SIZE;
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ret = ipc_wait_event (ctx, &event_type, &index, &originfd, &newfd, message, &size);
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if (ret != 0) {
return err (ctx, "Error while waiting for an event.");
}
if ((enum event_types) event_type != TIMER) {
printf ("EVENT %lu\t", count++);
}
switch ((enum event_types) event_type) {
case ERROR: return err(ctx, "Error.");
case EXTERNAL: return err(ctx, "External (shouldn't happen).");
case SWITCH_RX: return err(ctx, "Switch RX (shouldn't happen).");
case SWITCH_TX: return err(ctx, "Switch TX (shouldn't happen).");
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case CONNECTION: { printf ("New connection (%d).\n", newfd); break; }
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case DISCONNECTION: { printf ("User disconnected.\n"); break; }
case TIMER: {
printf ("\rTIMER (%lu).", count_timer++);
fflush(stdout);
if (max_count && count_timer >= (size_t) max_count) {
printf ("waited for %lu timer events: quitting\n", count_timer);
should_continue = 0;
}
break;
}
case MESSAGE_TX: {
printf ("Message sent.\n");
break;
}
case MESSAGE_RX: {
if (size == 0) {
return err(ctx, "Error: no message returned.");
}
else {
message[size+1] = '\0';
printf ("Message received (size %lu): %s.\n", size, message);
printf ("Scheduling this message.\n");
ret = ipc_schedule (ctx, originfd, message, size);
if (ret != 0) {
return err(ctx, "Cannot schedule a message.");
}
}
break;
}
}
}
printf ("Deinit context\n");
ipc_context_deinit (&ctx);
printf ("Context freed.\n");
return 0;
}