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linux: Fix CPU usage bug in console fd flushing

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If the vt gets a vhangup from under us, then the tty will appear ready
in select(), but trying to tcflush() it will return -EIO, so we'll spin
around at 100% CPU for no reason.  Notice this condition and unregister
the handler if it happens.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Adam Jackson 2010-08-25 11:06:38 -04:00 committed by Peter Hutterer
parent ecdbe817fd
commit a6b9e8f1e5
1 changed files with 5 additions and 1 deletions
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6
hw/xfree86/os-support/linux/lnx_init.c
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@ -85,7 +85,11 @@ static void *console_handler;
static void
drain_console(int fd, void *closure)
{
tcflush(fd, TCIOFLUSH);
errno = 0;
if (tcflush(fd, TCIOFLUSH) == -1 && errno == EIO) {
xf86RemoveGeneralHandler(console_handler);
console_handler = NULL;
}
}
void