linux-kernel - [PATCH 2/2] do_poll: return -EINTR when signalled

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Date:	Sat, 7 Jul 2007 22:48:07 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andi Kleen <ak@...e.de>, Vadim Lobanov <vlobanov@...akeasy.net>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] do_poll: return -EINTR when signalled

do_poll() checks signal_pending() but returns 0 when interrupted. This means
the caller has to check signal_pending() again.

Change it to return -EINTR when signal_pending() and count == 0.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- t/fs/select.c~2_move	2007-07-07 20:08:36.000000000 +0400
+++ t/fs/select.c	2007-07-07 20:42:00.000000000 +0400
@@ -588,7 +588,7 @@ static int do_poll(unsigned int nfds,  s
 	/* Optimise the no-wait case */
 	if (!(*timeout))
 		pt = NULL;
- 
+
 	for (;;) {
 		struct poll_list *walk;
 		long __timeout;
@@ -618,10 +618,12 @@ static int do_poll(unsigned int nfds,  s
 		 * a poll_table to them on the next loop iteration.
 		 */
 		pt = NULL;
-		if (count || !*timeout || signal_pending(current))
-			break;
-		count = wait->error;
-		if (count)
+		if (!count) {
+			count = wait->error;
+			if (signal_pending(current))
+				count = -EINTR;
+		}
+		if (count || !*timeout)
 			break;
 
 		if (*timeout < 0) {
@@ -691,8 +693,6 @@ int do_sys_poll(struct pollfd __user *uf
 
 	poll_initwait(&table);
 	fdcount = do_poll(nfds, head, &table, timeout);
-	if (!fdcount && signal_pending(current))
-		fdcount = -EINTR;
 	poll_freewait(&table);
 
 	for (walk = head; walk; walk = walk->next) {

-
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