Function devctl_notify

freebsd/kern/subr_bus.c:675–702

* @brief Send a 'notification' to userland, using standard ways */

 * @brief Send a 'notification' to userland, using standard ways
 */
void
devctl_notify(const char *system, const char *subsystem, const char *type,
    const char *data)
{
	struct dev_event_info *dei;
	struct sbuf sb;

	if (system == NULL || subsystem == NULL || type == NULL)
		return;
	dei = devctl_alloc_dei_sb(&sb);
	if (dei == NULL)
		return;
	sbuf_cpy(&sb, "!system=");
	sbuf_cat(&sb, system);
	sbuf_cat(&sb, " subsystem=");
	sbuf_cat(&sb, subsystem);
	sbuf_cat(&sb, " type=");
	sbuf_cat(&sb, type);
	if (data != NULL) {
		sbuf_putc(&sb, ' ');
		sbuf_cat(&sb, data);
	}
	sbuf_putc(&sb, '\n');
	if (sbuf_finish(&sb) != 0)
		devctl_free_dei(dei);	/* overflow -> drop it */
	else
		devctl_queue(dei);
}

/*
 * Common routine that tries to make sending messages as easy as possible.