libssh2_channel_wait_eof man page
libssh2_channel_wait_eof — wait for the remote to reply to an EOF request
int libssh2_channel_wait_eof(LIBSSH2_CHANNEL *channel);
Wait for the remote end to acknowledge an EOF request.
Return 0 on success 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.