LIBSSH2_CHANNEL * libssh2_channel_open_ex(LIBSSH2_SESSION *session, const char *channel_type, unsigned int channel_type_len, unsigned int window_size, unsigned int packet_size, const char *message, unsigned int message_len);
LIBSSH2_CHANNEL * libssh2_channel_open_session(session);
session - Session instance as returned by libssh2_session_init_ex,
channel_type - Channel type to open. Typically one of session, direct-tcpip, or tcpip-forward. The SSH2 protocol allowed for additional types including local, custom channel types.
channel_type_len - Length of channel_type
window_size - Maximum amount of unacknowledged data remote host is allowed to send before receiving an SSH_MSG_CHANNEL_WINDOW_ADJUST packet.
packet_size - Maximum number of bytes remote host is allowed to send in a single SSH_MSG_CHANNEL_DATA or SSG_MSG_CHANNEL_EXTENDED_DATA packet.
message - Additional data as required by the selected channel_type.
message_len - Length of message parameter.
Allocate a new channel for exchanging data with the server. This method is typically called through its macroized form: libssh2_channel_open_session, or via libssh2_channel_direct_tcpip, or libssh2_channel_forward_listen,
Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors.
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
LIBSSH2_ERROR_EAGAIN - Marked for non-blocking I/O but the call would block.
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