From patchwork Sat Feb 13 13:42:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Koegler X-Patchwork-Id: 8299921 Return-Path: X-Original-To: patchwork-alsa-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 95C159F38B for ; Sat, 13 Feb 2016 13:43:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AA3DD2044B for ; Sat, 13 Feb 2016 13:43:37 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.kernel.org (Postfix) with ESMTP id 6898F20437 for ; Sat, 13 Feb 2016 13:43:36 +0000 (UTC) Received: by alsa0.perex.cz (Postfix, from userid 1000) id BD7C6265E40; Sat, 13 Feb 2016 14:43:34 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id CA0D726129A; Sat, 13 Feb 2016 14:42:34 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 86EF9260A5B; Sat, 13 Feb 2016 14:42:33 +0100 (CET) Received: from vie01a-dmta-pe03-1.mx.upcmail.net (vie01a-dmta-pe03-1.mx.upcmail.net [62.179.121.160]) by alsa0.perex.cz (Postfix) with ESMTP id AE3E22605FF for ; Sat, 13 Feb 2016 14:42:26 +0100 (CET) Received: from [172.31.216.43] (helo=vie01a-pemc-psmtp-pe01) by vie01a-dmta-pe03.mx.upcmail.net with esmtp (Exim 4.72) (envelope-from ) id 1aUaSw-0000VR-Kn for alsa-devel@alsa-project.org; Sat, 13 Feb 2016 14:42:26 +0100 Received: from master.zuhause ([80.108.242.240]) by vie01a-pemc-psmtp-pe01 with SMTP @ mailcloud.upcmail.net id HpiR1s00M5BuuEg01piSi2; Sat, 13 Feb 2016 14:42:26 +0100 X-SourceIP: 80.108.242.240 Received: by master.zuhause (Postfix, from userid 1006) id 6B46D4AFBF14; Sat, 13 Feb 2016 14:42:25 +0100 (CET) From: Martin Koegler To: alsa-devel@alsa-project.org Date: Sat, 13 Feb 2016 14:42:17 +0100 Message-Id: <1455370937-501-3-git-send-email-martin@mail.zuhause> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1455370937-501-1-git-send-email-martin@mail.zuhause> References: <1455370937-501-1-git-send-email-martin@mail.zuhause> Cc: Martin Koegler Subject: [alsa-devel] [PATCH] Provide card number / PID via sequencer client info X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP From: Martin Koegler rawmidi devices expose the card number via IOCTLs, which allows to find the corresponding device in sysfs. The sequencer provides no identifing data. Chromium works around this issue by scanning rawmidi as well as sequencer devices and matching them by using assumtions, how the kernel register sequencer devices. This changes adds support for exposing the card number for kernel clients as well as the PID for user client. The minor of the API version is changed to distinguish between the zero initialised reserved field and card number 0. Signed-off-by: Martin Koegler --- include/uapi/sound/asequencer.h | 5 +++-- sound/core/seq/seq_clientmgr.c | 18 ++++++++++++++++++ sound/core/seq/seq_clientmgr.h | 2 ++ 3 files changed, 23 insertions(+), 2 deletions(-) diff --git a/include/uapi/sound/asequencer.h b/include/uapi/sound/asequencer.h index 5a5fa49..4726579 100644 --- a/include/uapi/sound/asequencer.h +++ b/include/uapi/sound/asequencer.h @@ -25,7 +25,7 @@ #include /** version of the sequencer */ -#define SNDRV_SEQ_VERSION SNDRV_PROTOCOL_VERSION (1, 0, 1) +#define SNDRV_SEQ_VERSION SNDRV_PROTOCOL_VERSION (1, 0, 2) /** * definition of sequencer event types @@ -357,7 +357,8 @@ struct snd_seq_client_info { unsigned char event_filter[32]; /* event filter bitmap */ int num_ports; /* RO: number of ports */ int event_lost; /* number of lost events */ - char reserved[64]; /* for future use */ + int owner; /* RO: card number[kernel] / PID[user] */ + char reserved[64 - sizeof(int)]; /* for future use */ }; diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c index 58e79e0..ac07ab7 100644 --- a/sound/core/seq/seq_clientmgr.c +++ b/sound/core/seq/seq_clientmgr.c @@ -364,6 +364,7 @@ static int snd_seq_open(struct inode *inode, struct file *file) /* fill client data */ user->file = file; sprintf(client->name, "Client-%d", c); + client->data.user.owner = get_pid(task_pid(current)); /* make others aware this new client */ snd_seq_system_client_ev_client_start(c); @@ -380,6 +381,7 @@ static int snd_seq_release(struct inode *inode, struct file *file) seq_free_client(client); if (client->data.user.fifo) snd_seq_fifo_delete(&client->data.user.fifo); + put_pid(client->data.user.owner); kfree(client); } @@ -1197,6 +1199,21 @@ static void get_client_info(struct snd_seq_client *cptr, info->event_lost = cptr->event_lost; memcpy(info->event_filter, cptr->event_filter, 32); info->num_ports = cptr->num_ports; + + switch (cptr->type) { + case USER_CLIENT: + info->owner = pid_vnr(cptr->data.user.owner); + break; + + case KERNEL_CLIENT: + info->owner = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; + break; + + default: + info->owner = -1; + break; + } + memset(info->reserved, 0, sizeof(info->reserved)); } @@ -2271,6 +2288,7 @@ int snd_seq_create_kernel_client(struct snd_card *card, int client_index, client->accept_input = 1; client->accept_output = 1; + client->data.kernel.card = card; va_start(args, name_fmt); vsnprintf(client->name, sizeof(client->name), name_fmt, args); diff --git a/sound/core/seq/seq_clientmgr.h b/sound/core/seq/seq_clientmgr.h index 20f0a72..031462e 100644 --- a/sound/core/seq/seq_clientmgr.h +++ b/sound/core/seq/seq_clientmgr.h @@ -33,6 +33,7 @@ struct snd_seq_user_client { struct file *file; /* file struct of client */ /* ... */ + struct pid* owner; /* fifo */ struct snd_seq_fifo *fifo; /* queue for incoming events */ @@ -41,6 +42,7 @@ struct snd_seq_user_client { struct snd_seq_kernel_client { /* ... */ + struct snd_card* card; };