libssh2_channel_write_ex(3) libssh2 manual libssh2_channel_write_ex(3)NAMElibssh2_channel_write_ex - write data to a channel stream blocking
SYNOPSIS
#include <libssh2.h>
ssize_t libssh2_channel_write_ex(LIBSSH2_CHANNEL *channel,
int stream_id, char *buf,
size_t buflen);
DESCRIPTION
Write data to a 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 cur‐
rently defines a stream ID of 1 to be the stderr substream.
channel - active channel stream to write to.
stream_id - substream ID number (e.g. 0 or SSH_EXTENDED_DATA_STDERR)
buf - pointer to buffer to write
buflen - size of the data to write
libssh2_channel_write(3) and libssh2_channel_write_stderr(3) are conve‐
nience macros for this function.
libssh2_channel_write_ex(3) will use as much as possible of the buffer
and put it into a single SSH protocol packet. This means that to get
maximum performance when sending larger files, you should try to always
pass in at least 32K of data to this function.
RETURN VALUE
Actual number of bytes written or negative on failure. LIB‐
SSH2_ERROR_EAGAIN when it would otherwise block. While LIB‐
SSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per
se.
ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
LIBSSH2_ERROR_CHANNEL_CLOSED - The channel has been closed.
LIBSSH2_ERROR_CHANNEL_EOF_SENT - The channel has been requested to be
closed.
SEE ALSOlibssh2_channel_open_ex(3)libssh2_channel_read_ex(3)libssh2 0.15 1 Jun 2007 libssh2_channel_write_ex(3)
