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libssh2_channel_read_ex.3
.TH libssh2_channel_read_ex 3 "1 Jun 2007" "libssh2 0.15" "libssh2 manual" .SH NAME libssh2_channel_read_ex - read data from a channel stream .SH SYNOPSIS #include <libssh2.h> 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); .SH DESCRIPTION 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 \fIstream_id\fP. The SSH2 protocol currently defines a stream ID of 1 to be the stderr substream. \fIchannel\fP - active channel stream to read from. \fIstream_id\fP - substream ID number (e.g. 0 or SSH_EXTENDED_DATA_STDERR) \fIbuf\fP - pointer to storage buffer to read data into \fIbuflen\fP - size of the buf storage \fIlibssh2_channel_read(3)\fP and \fIlibssh2_channel_read_stderr(3)\fP are macros. .SH RETURN VALUE Actual number of bytes read or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_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. .SH ERRORS \fILIBSSH2_ERROR_SOCKET_SEND\fP - Unable to send data on socket. \fILIBSSH2_ERROR_CHANNEL_CLOSED\fP - The channel has been closed. .SH SEE ALSO .BR libssh2_poll_channel_read(3)