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bh=iKcXNqoKQ9PlHlaamZu7e42WXZCYcY/ba4R23Tc+J70=; b=MmU7ZnyoIQMUDdWlgqh8fNe62kulVDbO9J1ZLfBs/83p+xFgSgqMaNotgCqiS8ufp6SAek /kKHV8Ej3wU0MohKXDtcOoTgR4SHwLtqCQakUZg77H7jEDyTnG6bmAFO0DD0Hs8wBd5HH0 toDZgbLv0RIkmI8n0rXXxNf1BD1wAb0= X-MC-Unique: 2hsxdQ4uPEWemRyYOyPVRw-1 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: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" 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-d= aemon.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. =20 +.. option:: --pidfile PATH + + is the path to a file where the daemon writes its pid. This allows scrip= ts 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, }; =20 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 =3D 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(); } =20 +static void pid_file_cleanup(void) +{ + unlink(pid_file); +} + +static void pid_file_init(void) +{ + Error *err =3D 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); =20 + /* + * Write the pid file after creating chardevs, exports, and NBD server= s but + * before accepting connections. This ordering is documented. Do not c= hange + * it. + */ + pid_file_init(); + while (!exit_requested) { main_loop_wait(false); } --=20 2.29.2