From 7584af10cf46e0f4aa1696f1be79fa0f19a945ba Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Tue, 10 Nov 2009 10:14:04 +0100 Subject: [PATCH] sound: rawmidi: record a substream's owner process Record the pid of the task that opened a RawMIDI substream. Signed-off-by: Clemens Ladisch Signed-off-by: Takashi Iwai --- include/sound/rawmidi.h | 2 ++ sound/core/rawmidi.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h index c23c265..2480e7d 100644 --- a/include/sound/rawmidi.h +++ b/include/sound/rawmidi.h @@ -46,6 +46,7 @@ struct snd_rawmidi; struct snd_rawmidi_substream; struct snd_seq_port_info; +struct pid; struct snd_rawmidi_ops { int (*open) (struct snd_rawmidi_substream * substream); @@ -97,6 +98,7 @@ struct snd_rawmidi_substream { struct snd_rawmidi_str *pstr; char name[32]; struct snd_rawmidi_runtime *runtime; + struct pid *pid; /* hardware layer */ struct snd_rawmidi_ops *ops; }; diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c index 818b129..2f76612 100644 --- a/sound/core/rawmidi.c +++ b/sound/core/rawmidi.c @@ -278,6 +278,7 @@ static int open_substream(struct snd_rawmidi *rmidi, substream->active_sensing = 0; if (mode & SNDRV_RAWMIDI_LFLG_APPEND) substream->append = 1; + substream->pid = get_pid(task_pid(current)); rmidi->streams[substream->stream].substream_opened++; } substream->use_count++; @@ -488,6 +489,8 @@ static void close_substream(struct snd_rawmidi *rmidi, snd_rawmidi_runtime_free(substream); substream->opened = 0; substream->append = 0; + put_pid(substream->pid); + substream->pid = NULL; rmidi->streams[substream->stream].substream_opened--; } @@ -1336,6 +1339,9 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, substream->number, (unsigned long) substream->bytes); if (substream->opened) { + snd_iprintf(buffer, + " Owner PID : %d\n", + pid_vnr(substream->pid)); runtime = substream->runtime; snd_iprintf(buffer, " Mode : %s\n" @@ -1357,6 +1363,9 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, substream->number, (unsigned long) substream->bytes); if (substream->opened) { + snd_iprintf(buffer, + " Owner PID : %d\n", + pid_vnr(substream->pid)); runtime = substream->runtime; snd_iprintf(buffer, " Buffer size : %lu\n" -- 2.7.4