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check availability of CLOCK_MONOTONIC

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Use monotonic timestamps only after checking that CLOCK_MONOTONIC is
actually supported by the C library.
This commit is contained in:
Clemens Ladisch 2008-01-14 08:51:45 +01:00
parent 07e1341548
commit 0e8a259914
2 changed files with 16 additions and 7 deletions
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15
src/pcm/pcm_hw.c
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@ -996,13 +996,16 @@ int snd_pcm_hw_open_fd(snd_pcm_t **pcmp, const char *name,
#ifdef HAVE_CLOCK_GETTIME
if (SNDRV_PROTOCOL_VERSION(2, 0, 9) <= ver) {
int on = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
if (ioctl(fd, SNDRV_PCM_IOCTL_TTSTAMP, &on) < 0) {
ret = -errno;
SNDMSG("TTSTAMP failed\n");
return ret;
struct timespec timespec;
if (clock_gettime(CLOCK_MONOTONIC, &timespec) == 0) {
int on = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
if (ioctl(fd, SNDRV_PCM_IOCTL_TTSTAMP, &on) < 0) {
ret = -errno;
SNDMSG("TTSTAMP failed\n");
return ret;
}
monotonic = 1;
}
monotonic = 1;
}
#endif
else if (SNDRV_PROTOCOL_VERSION(2, 0, 5) <= ver) {