From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4A13C4332B for ; Fri, 5 Mar 2021 17:12:13 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3E431650A5 for ; Fri, 5 Mar 2021 17:12:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E431650A5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:59750 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lIDzo-0002F3-2W for qemu-devel@archiver.kernel.org; Fri, 05 Mar 2021 12:12:12 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:32822) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lIDkI-0006vY-Ns for qemu-devel@nongnu.org; Fri, 05 Mar 2021 11:56:10 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:58808) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1lIDk5-0007Cr-BL for qemu-devel@nongnu.org; Fri, 05 Mar 2021 11:56:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1614963356; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iKcXNqoKQ9PlHlaamZu7e42WXZCYcY/ba4R23Tc+J70=; b=MmU7ZnyoIQMUDdWlgqh8fNe62kulVDbO9J1ZLfBs/83p+xFgSgqMaNotgCqiS8ufp6SAek /kKHV8Ej3wU0MohKXDtcOoTgR4SHwLtqCQakUZg77H7jEDyTnG6bmAFO0DD0Hs8wBd5HH0 toDZgbLv0RIkmI8n0rXXxNf1BD1wAb0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-255-2hsxdQ4uPEWemRyYOyPVRw-1; Fri, 05 Mar 2021 11:55:54 -0500 X-MC-Unique: 2hsxdQ4uPEWemRyYOyPVRw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B0DFCDF8C4; Fri, 5 Mar 2021 16:55:19 +0000 (UTC) Received: from merkur.redhat.com (ovpn-112-36.phx2.redhat.com [10.3.112.36]) by smtp.corp.redhat.com (Postfix) with ESMTP id A447460BF3; Fri, 5 Mar 2021 16:55:18 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PULL 09/31] qemu-storage-daemon: add --pidfile option Date: Fri, 5 Mar 2021 17:54:32 +0100 Message-Id: <20210305165454.356840-10-kwolf@redhat.com> In-Reply-To: <20210305165454.356840-1-kwolf@redhat.com> References: <20210305165454.356840-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kwolf@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Stefan Hajnoczi Daemons often have a --pidfile option where the pid is written to a file so that scripts can stop the daemon by sending a signal. The pid file also acts as a lock to prevent multiple instances of the daemon from launching for a given pid file. QEMU, qemu-nbd, qemu-ga, virtiofsd, and qemu-pr-helper all support the --pidfile option. Add it to qemu-storage-daemon too. Reported-by: Richard W.M. Jones Signed-off-by: Stefan Hajnoczi Message-Id: <20210302142746.170535-1-stefanha@redhat.com> Reviewed-by: Richard W.M. Jones Signed-off-by: Kevin Wolf --- docs/tools/qemu-storage-daemon.rst | 14 +++++++++++ storage-daemon/qemu-storage-daemon.c | 36 ++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+) diff --git a/docs/tools/qemu-storage-daemon.rst b/docs/tools/qemu-storage-daemon.rst index c05b3d3811..6ce85f2f7d 100644 --- a/docs/tools/qemu-storage-daemon.rst +++ b/docs/tools/qemu-storage-daemon.rst @@ -118,6 +118,20 @@ Standard options: List object properties with ``,help``. See the :manpage:`qemu(1)` manual page for a description of the object properties. +.. option:: --pidfile PATH + + is the path to a file where the daemon writes its pid. This allows scripts to + stop the daemon by sending a signal:: + + $ kill -SIGTERM $( write process ID to a file after startup\n" +"\n" QEMU_HELP_BOTTOM "\n", error_get_progname()); } @@ -126,6 +129,7 @@ enum { OPTION_MONITOR, OPTION_NBD_SERVER, OPTION_OBJECT, + OPTION_PIDFILE, }; extern QemuOptsList qemu_chardev_opts; @@ -178,6 +182,7 @@ static void process_options(int argc, char *argv[]) {"monitor", required_argument, NULL, OPTION_MONITOR}, {"nbd-server", required_argument, NULL, OPTION_NBD_SERVER}, {"object", required_argument, NULL, OPTION_OBJECT}, + {"pidfile", required_argument, NULL, OPTION_PIDFILE}, {"trace", required_argument, NULL, 'T'}, {"version", no_argument, NULL, 'V'}, {0, 0, 0, 0} @@ -289,6 +294,9 @@ static void process_options(int argc, char *argv[]) qobject_unref(args); break; } + case OPTION_PIDFILE: + pid_file = optarg; + break; case 1: error_report("Unexpected argument"); exit(EXIT_FAILURE); @@ -299,6 +307,27 @@ static void process_options(int argc, char *argv[]) loc_set_none(); } +static void pid_file_cleanup(void) +{ + unlink(pid_file); +} + +static void pid_file_init(void) +{ + Error *err = NULL; + + if (!pid_file) { + return; + } + + if (!qemu_write_pidfile(pid_file, &err)) { + error_reportf_err(err, "cannot create PID file: "); + exit(EXIT_FAILURE); + } + + atexit(pid_file_cleanup); +} + int main(int argc, char *argv[]) { #ifdef CONFIG_POSIX @@ -326,6 +355,13 @@ int main(int argc, char *argv[]) qemu_init_main_loop(&error_fatal); process_options(argc, argv); + /* + * Write the pid file after creating chardevs, exports, and NBD servers but + * before accepting connections. This ordering is documented. Do not change + * it. + */ + pid_file_init(); + while (!exit_requested) { main_loop_wait(false); } -- 2.29.2