Commit fad08b20 authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Greg Kroah-Hartman
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vcs: fasync(): make it consistent with poll() 



We use POLLPRI not POLLIN to wait for data with poll() as there is
never any incoming data stream per se. Let's use the same semantic
with fasync() for consistency, including the fact that a vt may go away.

No known user space ever relied on the SIGIO reason so far, let alone
FASYNC, so the risk of breakage is pretty much nonexistent.

Signed-off-by: default avatarNicolas Pitre <nico@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1bf931ab

drivers/tty/vt/vc_screen.c

+12 −3
Original line number Diff line number Diff line
@@ -93,9 +93,18 @@ vcs_notifier(struct notifier_block *nb, unsigned long code, void *_param) 
	struct vcs_poll_data *poll =

		container_of(nb, struct vcs_poll_data, notifier);

	int currcons = poll->cons_num;

	int fa_band;



	if (code != VT_UPDATE && code != VT_DEALLOCATE)

	switch (code) {

	case VT_UPDATE:

		fa_band = POLL_PRI;

		break;

	case VT_DEALLOCATE:

		fa_band = POLL_HUP;

		break;

	default:

		return NOTIFY_DONE;

	}



	if (currcons == 0)

		currcons = fg_console;
@@ -106,7 +115,7 @@ vcs_notifier(struct notifier_block *nb, unsigned long code, void *_param) 


	poll->event = code;

	wake_up_interruptible(&poll->waitq);

	kill_fasync(&poll->fasync, SIGIO, POLL_IN);

	kill_fasync(&poll->fasync, SIGIO, fa_band);

	return NOTIFY_OK;

}