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More generic support for poll descriptors

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This commit is contained in:
Abramo Bagnara 2001-02-12 23:51:49 +00:00
parent a86efa083c
commit 460660d4b4
25 changed files with 162 additions and 68 deletions
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43
src/mixer/mixer.c
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@ -447,19 +447,48 @@ int snd_mixer_set_compare(snd_mixer_t *mixer, snd_mixer_compare_t msort)
return 0;
}
int snd_mixer_poll_descriptor(snd_mixer_t *mixer, const char *name)
int snd_mixer_poll_descriptors(snd_mixer_t *mixer, struct pollfd *pfds, unsigned int space)
{
struct list_head *pos, *next;
assert(mixer && name);
unsigned int count = 0;
assert(mixer);
list_for_each(pos, next, &mixer->slaves) {
snd_mixer_slave_t *s;
const char *n;
int n;
s = list_entry(pos, snd_mixer_slave_t, list);
n = snd_hctl_name(s->hctl);
if (n && strcmp(name, n) == 0)
return snd_hctl_poll_descriptor(s->hctl);
n = snd_hctl_poll_descriptors(s->hctl, pfds, space);
if (n < 0)
return n;
count += n;
if (space > (unsigned int) n) {
space -= n;
pfds += n;
} else
space = 0;
}
return -ENOENT;
return count;
}
int snd_mixer_wait(snd_mixer_t *mixer, int timeout)
{
struct pollfd spfds[16];
struct pollfd *pfds = spfds;
int err;
int count;
count = snd_mixer_poll_descriptors(mixer, pfds, sizeof(spfds) / sizeof(spfds[0]));
if (count < 0)
return count;
if ((unsigned int) count > sizeof(spfds) / sizeof(spfds[0])) {
pfds = malloc(count * sizeof(*pfds));
if (!pfds)
return -ENOMEM;
err = snd_mixer_poll_descriptors(mixer, pfds, count);
assert(err == count);
}
err = poll(pfds, count, timeout);
if (err < 0)
return -errno;
return 0;
}
snd_mixer_elem_t *snd_mixer_first_elem(snd_mixer_t *mixer)