fix polling logic, use timeout of -1 not 0

1 files changed, 21 insertions, 21 deletions

diff --git a/libasound.c b/libasound.c
index ffc486d..749a879 100644
--- a/libasound.c
+++ b/libasound.c
@@ -327,31 +327,31 @@ snd_pcm_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)
 snd_pcm_sframes_t
 snd_pcm_avail_update(snd_pcm_t *pcm)
 {
-   struct pollfd pfd[16];
-   int nfds = sio_nfds(pcm->hdl);
-   assert((unsigned int)nfds < ARRAY_SIZE(pfd));
-
-   // FIXME: should POLLIN / POLLOUT depending on stream
-   if (!sio_pollfd(pcm->hdl, pfd, POLLOUT)) {
-      WARNX1("sio_pollfd failed");
-      goto fail;
-   }
-
-   errno = 0;
-   while ((nfds = poll(pfd, nfds, 0)) < 0) {
-      if (errno == EINVAL) {
-         WARNX1("poll EINVAL");
+   while (1) {
+      struct pollfd pfd[16];
+      int nfds = sio_nfds(pcm->hdl);
+      assert((unsigned int)nfds < ARRAY_SIZE(pfd));
+
+      // FIXME: should POLLIN / POLLOUT depending on stream
+      if (!sio_pollfd(pcm->hdl, pfd, POLLOUT)) {
+         WARNX1("sio_pollfd failed");
          goto fail;
       }
-   }
 
-   int events = 0;
-   for (int i = 0; i < nfds; ++i)
-      events |= sio_revents(pcm->hdl, pfd);
+      errno = 0;
+      while ((nfds = poll(pfd, nfds, -1)) < 0) {
+         if (errno == EINVAL) {
+            WARNX1("poll EINVAL");
+            goto fail;
+         }
+      }
 
-   // FIXME: should POLLIN / POLLOUT depending on stream
-   if (!(events & POLLOUT))
-      goto fail;
+      const int events = sio_revents(pcm->hdl, pfd);
+      if (!(events & (POLLOUT | POLLIN)))
+         continue;
+
+      break;
+   }
 
    return pcm->hw.par.appbufsz;