Function logioctl

freebsd/kern/subr_log.c:256–298

ARGSUSED*/

/*ARGSUSED*/
static	int
logioctl(struct cdev *dev, u_long com, caddr_t data, int flag, struct thread *td)
{

	switch (com) {
	/* return number of characters immediately available */
	case FIONREAD:
		*(int *)data = msgbuf_getcount(msgbufp);
		break;

	case FIONBIO:
		break;

	case FIOASYNC:
		mtx_lock(&msgbuf_lock);
		if (*(int *)data)
			logsoftc.sc_state |= LOG_ASYNC;
		else
			logsoftc.sc_state &= ~LOG_ASYNC;
		mtx_unlock(&msgbuf_lock);
		break;

	case FIOSETOWN:
		return (fsetown(*(int *)data, &logsoftc.sc_sigio));

	case FIOGETOWN:
		*(int *)data = fgetown(&logsoftc.sc_sigio);
		break;

	/* This is deprecated, FIOSETOWN should be used instead. */
	case TIOCSPGRP:
		return (fsetown(-(*(int *)data), &logsoftc.sc_sigio));

	/* This is deprecated, FIOGETOWN should be used instead */
	case TIOCGPGRP:
		*(int *)data = -fgetown(&logsoftc.sc_sigio);
		break;

	default:
		return (ENOTTY);
	}
	return (0);
}

static void
log_drvinit(void *unused)