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control.c: snd_ctl_wait: fix revents handling

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The revents parameter of snd_ctl_poll_descriptors_revents() is a single
value, not an array.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2009-08-10 10:11:15 +02:00
parent f3dc8e2aa4
commit 34d63b449f
1 changed files with 10 additions and 17 deletions
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23
src/control/control.c
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@ -674,8 +674,8 @@ int snd_ctl_read(snd_ctl_t *ctl, snd_ctl_event_t *event)
int snd_ctl_wait(snd_ctl_t *ctl, int timeout)
{
struct pollfd *pfd;
unsigned short *revents;
int i, npfds, pollio, err, err_poll;
unsigned short revents;
int i, npfds, err, err_poll;
npfds = snd_ctl_poll_descriptors_count(ctl);
if (npfds <= 0 || npfds >= 16) {
@ -683,7 +683,6 @@ int snd_ctl_wait(snd_ctl_t *ctl, int timeout)
return -EIO;
}
pfd = alloca(sizeof(*pfd) * npfds);
revents = alloca(sizeof(*revents) * npfds);
err = snd_ctl_poll_descriptors(ctl, pfd, npfds);
if (err < 0)
return err;
@ -691,26 +690,20 @@ int snd_ctl_wait(snd_ctl_t *ctl, int timeout)
SNDMSG("invalid poll descriptors %d\n", err);
return -EIO;
}
do {
for (;;) {
err_poll = poll(pfd, npfds, timeout);
if (err_poll < 0)
return -errno;
if (! err_poll)
break;
err = snd_ctl_poll_descriptors_revents(ctl, pfd, npfds, revents);
return 0;
err = snd_ctl_poll_descriptors_revents(ctl, pfd, npfds, &revents);
if (err < 0)
return err;
pollio = 0;
for (i = 0; i < npfds; i++) {
if (revents[i] & (POLLERR | POLLNVAL))
if (revents & (POLLERR | POLLNVAL))
return -EIO;
if ((revents[i] & (POLLIN | POLLOUT)) == 0)
continue;
pollio++;
if (revents & (POLLIN | POLLOUT))
return 1;
}
} while (! pollio);
return err_poll > 0 ? 1 : 0;
}
/**