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Changed behaviour of poll_descriptors function (returns the filled count of fds).

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Added poll_descriptors_count functions.
Added snd_mixer_elem_count function.
This commit is contained in:
Jaroslav Kysela 2001-02-14 12:15:03 +00:00
parent c71b72ee27
commit cc956312b3
11 changed files with 82 additions and 7 deletions
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29
src/mixer/mixer.c
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@ -434,6 +434,25 @@ int snd_mixer_set_compare(snd_mixer_t *mixer, snd_mixer_compare_t msort)
return 0;
}
int snd_mixer_poll_descriptors_count(snd_mixer_t *mixer, unsigned int *count)
{
struct list_head *pos;
unsigned int c = 0, v;
assert(mixer);
assert(count);
list_for_each(pos, &mixer->slaves) {
snd_mixer_slave_t *s;
int n;
s = list_entry(pos, snd_mixer_slave_t, list);
n = snd_hctl_poll_descriptors_count(s->hctl, &v);
if (n < 0)
return n;
c += v;
}
*count = c;
return 0;
}
int snd_mixer_poll_descriptors(snd_mixer_t *mixer, struct pollfd *pfds, unsigned int space)
{
struct list_head *pos;
@ -446,8 +465,8 @@ int snd_mixer_poll_descriptors(snd_mixer_t *mixer, struct pollfd *pfds, unsigned
n = snd_hctl_poll_descriptors(s->hctl, pfds, space);
if (n < 0)
return n;
count += n;
if (space > (unsigned int) n) {
if (space >= (unsigned int) n) {
count += n;
space -= n;
pfds += n;
} else
@ -510,6 +529,12 @@ snd_mixer_elem_t *snd_mixer_elem_prev(snd_mixer_elem_t *elem)
return list_entry(elem->list.prev, snd_mixer_elem_t, list);
}
size_t snd_mixer_elem_count(snd_mixer_t *mixer)
{
assert(mixer);
return mixer->count;
}
int snd_mixer_handle_events(snd_mixer_t *mixer)
{
struct list_head *pos;