libwebsockets - libwebsockets_fork_service_loop

gistfile1.c

int fd;
	struct sockaddr_in cli_addr;
	int n;
	int p;

	n = fork();
	if (n < 0)
		return n;

	if (!n) {

		/* main process context */

		/*
		 * set up the proxy sockets to allow broadcast from
		 * service process context
		 */

		for (p = 0; p < context->count_protocols; p++) {
			fd = socket(AF_INET, SOCK_STREAM, 0);
			if (fd < 0) {
				fprintf(stderr, "Unable to create socket\n");
				return -1;
			}
			cli_addr.sin_family = AF_INET;
			cli_addr.sin_port = htons(
			     context->protocols[p].broadcast_socket_port);
			cli_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
			n = connect(fd, (struct sockaddr *)&cli_addr,
							       sizeof cli_addr);
			if (n < 0) {
				fprintf(stderr, "Unable to connect to "
						"broadcast socket %d, %s\n",
						n, strerror(errno));
				return -1;
			}

			context->protocols[p].broadcast_socket_user_fd = fd;
		}

		return 0;
	}

#ifdef HAVE_SYS_PRCTL_H
	/* we want a SIGHUP when our parent goes down */
	prctl(PR_SET_PDEATHSIG, SIGHUP);
#endif

	/* in this forked process, sit and service websocket connections */

	while (1) {
		if (libwebsocket_service(context, 1000))
			break;
#ifndef HAVE_SYS_PRCTL_H
/*
 * on systems without prctl() (i.e. anything but linux) we can notice that our
 * parent is dead if getppid() returns 1. FIXME apparently this is not true for
 * solaris, could remember ppid right after fork and wait for it to change.
 */

        if (getppid() == 1)
            break;
#endif
    }