libssh2_channel_write_ex

Section: libssh2 manual (3)
Updated: 1 Jun 2007
Index Return to Main Contents

NAME

libssh2_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);

ssize_t libssh2_channel_write(LIBSSH2_CHANNEL *channel, char *buf, size_t buflen);

ssize_t libssh2_channel_write_stderr(LIBSSH2_CHANNEL *channel, 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 currently 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 macros.

RETURN VALUE

Actual number of bytes written or negative on failure. LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_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.