From a1ce94d03bfdfaa1ef31c1a84383105888ac5f3b Mon Sep 17 00:00:00 2001 From: Martin Koegler Date: Wed, 2 Mar 2016 19:26:28 +0100 Subject: [PATCH] ALSA: seq: Provide card number / PID via sequencer client info 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. [minor coding style fixes by tiwai] Signed-off-by: Martin Koegler Acked-by: Clemens Ladisch Signed-off-by: Takashi Iwai --- include/uapi/sound/asequencer.h | 6 ++++-- sound/core/seq/seq_clientmgr.c | 14 ++++++++++++++ sound/core/seq/seq_clientmgr.h | 2 ++ 3 files changed, 20 insertions(+), 2 deletions(-) diff --git a/include/uapi/sound/asequencer.h b/include/uapi/sound/asequencer.h index af96f2044f91..7b7659a79ac4 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 +357,9 @@ 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 card; /* RO: card number[kernel] */ + int pid; /* RO: pid[user] */ + char reserved[56]; /* for future use */ }; diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c index 58e79e02f217..d6d9419d8bac 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 +1199,17 @@ 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; + + if (cptr->type == USER_CLIENT) + info->pid = pid_vnr(cptr->data.user.owner); + else + info->pid = -1; + + if (cptr->type == KERNEL_CLIENT) + info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1; + else + info->card = -1; + memset(info->reserved, 0, sizeof(info->reserved)); } @@ -2271,6 +2284,7 @@ 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 20f0a725ec7d..c6614254ef8a 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; }; -- 2.30.2