From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthias Lederhofer Subject: [PATCH 2/5] daemon: if one of the standard fds is missing open it to /dev/null Date: Thu, 13 Jul 2006 12:10:51 +0200 Message-ID: References: X-From: git-owner@vger.kernel.org Thu Jul 13 13:55:58 2006 Return-path: Envelope-to: gcvg-git@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by ciao.gmane.org with esmtp (Exim 4.43) id 1G0znH-0007Iu-EZ for gcvg-git@gmane.org; Thu, 13 Jul 2006 13:55:47 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932506AbWGMLzn (ORCPT ); Thu, 13 Jul 2006 07:55:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932511AbWGMLzn (ORCPT ); Thu, 13 Jul 2006 07:55:43 -0400 Received: from moooo.ath.cx ([85.116.203.178]:15065 "EHLO moooo.ath.cx") by vger.kernel.org with ESMTP id S932506AbWGMLzm (ORCPT ); Thu, 13 Jul 2006 07:55:42 -0400 To: git@vger.kernel.org In-Reply-To: Sender: git-owner@vger.kernel.org Precedence: bulk X-Mailing-List: git@vger.kernel.org Archived-At: Signed-off-by: Matthias Lederhofer --- daemon.c | 20 ++++++++++++++++++++ 1 files changed, 20 insertions(+), 0 deletions(-) diff --git a/daemon.c b/daemon.c index a7636bc..e6b1730 100644 --- a/daemon.c +++ b/daemon.c @@ -662,6 +662,24 @@ static int service_loop(int socknum, int } } +/* if any standard file descriptor is missing open it to /dev/null */ +static void sanitize_stdfds(void) +{ + int devnull = -1, i; + struct stat buf; + for (i = 0; i < 3; ++i) { + if (fstat(i, &buf) != -1) + continue; + if (devnull == -1 && + (devnull = open("/dev/null", O_RDWR, 0)) == -1) + die("open /dev/null failed: %s", strerror(errno)); + if (dup2(devnull, i) != i) + die("dup2 failed: %s", strerror(errno)); + } + if (devnull != -1) + close(devnull); +} + static int serve(int port) { int socknum, *socklist; @@ -773,5 +791,7 @@ int main(int argc, char **argv) return execute(peer); } + sanitize_stdfds(); + return serve(port); } -- 1.4.1.gb16f