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select(2): Drop checking descriptors in case of immediate timeout. 

* select.cc (select): Call sel.poll only if sel.wait returned
	select_ok.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2016-01-11 10:36:33 +01:00
parent e3b230b043
commit 20ddde2f55
1 changed files with 11 additions and 6 deletions
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13
winsup/cygwin/select.cc
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@ -189,13 +189,18 @@ select (int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
UNIX_FD_ZERO (readfds, maxfds); UNIX_FD_ZERO (readfds, maxfds);
UNIX_FD_ZERO (writefds, maxfds); UNIX_FD_ZERO (writefds, maxfds);
UNIX_FD_ZERO (exceptfds, maxfds); UNIX_FD_ZERO (exceptfds, maxfds);
/* Set bit mask from sel records even in case of a timeout so we if (res == select_stuff::select_set_zero)
don't miss one. This also sets ret to the right value >= 0, ret = 0;
matching the number of bits set in the fds records. */ else
{
/* Set bit mask from sel records. This also sets ret to the
right value >= 0, matching the number of bits set in the
fds records. if ret is 0, continue to loop. */
ret = sel.poll (readfds, writefds, exceptfds); ret = sel.poll (readfds, writefds, exceptfds);
if (!ret && res != select_stuff::select_set_zero) if (!ret)
res = select_stuff::select_loop; res = select_stuff::select_loop;
} }
}
/* Always clean up everything here. If we're looping then build it /* Always clean up everything here. If we're looping then build it
all up again. */ all up again. */
sel.cleanup (); sel.cleanup ();