SND_PCM_CAPTURE_EMPT(9) Sound Devices SND_PCM_CAPTURE_EMPT(9)NAME
snd_pcm_capture_empty - check whether the capture buffer is empty
int snd_pcm_capture_empty(struct snd_pcm_substream * substream);
the pcm substream instance
Checks whether the capture buffer is empty.
Non-zero if empty, or zero if not.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SND_PCM_CAPTURE_EMPT(9)
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libssh2_channel_read_ex(3) libssh2 manual libssh2_channel_read_ex(3)NAME
libssh2_channel_read_ex - read data from a channel stream
ssize_t libssh2_channel_read_ex(LIBSSH2_CHANNEL *channel, int stream_id, char *buf, size_t buflen);
ssize_t libssh2_channel_read(LIBSSH2_CHANNEL *channel, char *buf, size_t buflen);
ssize_t libssh2_channel_read_stderr(LIBSSH2_CHANNEL *channel, char *buf, size_t buflen);
Attempt to read data from an active channel stream. All channel streams have one standard I/O substream (stream_id == 0), and may have up
to 2^32 extended data streams as identified by the selected stream_id. The SSH2 protocol currently defines a stream ID of 1 to be the
channel - active channel stream to read from.
stream_id - substream ID number (e.g. 0 or SSH_EXTENDED_DATA_STDERR)
buf - pointer to storage buffer to read data into
buflen - size of the buf storage
libssh2_channel_read(3) and libssh2_channel_read_stderr(3) are macros.
Actual number of bytes read or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIB-
SSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se.
Note that a return value of zero (0) can in fact be a legitimate value and only signals that no payload data was read. It is not an error.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
LIBSSH2_ERROR_CHANNEL_CLOSED - The channel has been closed.
SEE ALSO libssh2_poll_channel_read(3)libssh2 0.15 1 Jun 2007 libssh2_channel_read_ex(3)
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