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Wed, 1 Nov 2023 09:00:38 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id CKqxD7YTQmWeeQAAMHmgww (envelope-from ); Wed, 01 Nov 2023 09:00:38 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 2082a0ac-7895-11ee-98d6-6d05b1d4d9a1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1698829238; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BBCYYLq8RLRTC07yvHLcGeOw7lLnh2hUZttfKIwKhhk=; b=kmvqIvyZZbyed7wfK0z8dsqPN9cEhkgdaSxvM8FaTMZpp3gpQsfOkvn8lUqV+c3r7lpafG GW8iPSd7PGh454KuPgwiYRSYzhAkzNGbZqil6jR0hecUowX45BSF9offJrvY9fKFLsKfZ/ n1sW3HxwvzuFnJykVodU1BWGf1CMTXY= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, wl@xen.org, Juergen Gross Subject: [PATCH 2/3] Mini-OS: don't crash if no shutdown node is available Date: Wed, 1 Nov 2023 10:00:23 +0100 Message-Id: <20231101090024.28934-3-jgross@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20231101090024.28934-1-jgross@suse.com> References: <20231101090024.28934-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1698829275769100007 Content-Type: text/plain; charset="utf-8" It might be perfectly fine not to have a control/shutdown Xenstore node. If this is the case, don't crash, but just terminate the shutdown thread after issuing a message that shutdown isn't available. In fini_shutdown() clearing the watch can result in an error now, in case the early exit above was taken. Just ignore this error now. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- shutdown.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/shutdown.c b/shutdown.c index bb2c6f11..ded6b64d 100644 --- a/shutdown.c +++ b/shutdown.c @@ -75,7 +75,9 @@ static void shutdown_thread(void *p) xenbus_wait_for_watch(&events); if ((err =3D xenbus_read(XBT_NIL, path, &shutdown))) { free(err); - do_exit(); + free(xenbus_unwatch_path_token(XBT_NIL, path, token)); + printk("Shutdown Xenstore node not available.\n"); + return; } =20 if (end_shutdown_thread) @@ -117,15 +119,9 @@ void init_shutdown(void) =20 void fini_shutdown(void) { - char *err; - end_shutdown_thread =3D 1; xenbus_release_wait_for_watch(&events); - err =3D xenbus_unwatch_path_token(XBT_NIL, path, token); - if (err) { - free(err); - do_exit(); - } + free(xenbus_unwatch_path_token(XBT_NIL, path, token)); } #endif =20 --=20 2.35.3