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sound: rawmidi: record a substream's owner process

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Record the pid of the task that opened a RawMIDI substream.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2009-11-10 10:14:04 +01:00 committed by Takashi Iwai
parent e7373b702f
commit 7584af10cf
2 changed files with 11 additions and 0 deletions
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2
include/sound/rawmidi.h
View File

@ -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;
};

9
sound/core/rawmidi.c
View File

@ -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"