libssh2\_session\_startup(3) libssh2 libssh2\_session\_startup(3) # [NAME](#NAME) libssh2\_session\_startup - begin transport layer # [SYNOPSIS](#SYNOPSIS) ``` #include int libssh2_session_startup(LIBSSH2_SESSION *session, int socket); ``` # [DESCRIPTION](#DESCRIPTION) Starting in libssh2 version 1.2.8 this function is considered deprecated. Use [*libssh2\_session\_handshake(3)*](/man/os/libssh2/libssh2_session_handshake.3) instead. *session* - Session instance as returned by [**libssh2\_session\_init\_ex(3)**](/man/os/libssh2/libssh2_session_init_ex.3) *socket* - Connected socket descriptor. Typically a TCP connection though the protocol allows for any reliable transport and the library will attempt to use any berkeley socket. Begin transport layer protocol negotiation with the connected host. # [RETURN VALUE](#RETURN_VALUE) Returns 0 on success, negative on failure. # [ERRORS](#ERRORS) *LIBSSH2\_ERROR\_SOCKET\_NONE* - The socket is invalid. *LIBSSH2\_ERROR\_BANNER\_SEND* - Unable to send banner to remote host. *LIBSSH2\_ERROR\_KEX\_FAILURE* - Encryption key exchange with the remote host failed. *LIBSSH2\_ERROR\_SOCKET\_SEND* - Unable to send data on socket. *LIBSSH2\_ERROR\_SOCKET\_DISCONNECT* - The socket was disconnected. *LIBSSH2\_ERROR\_PROTO* - An invalid SSH protocol response was received on the socket. *LIBSSH2\_ERROR\_EAGAIN* - Marked for non-blocking I/O but the call would block. # [SEE ALSO](#SEE_ALSO) [**libssh2\_session\_free(3)**](/man/os/libssh2/libssh2_session_free.3) [**libssh2\_session\_init\_ex(3)**](/man/os/libssh2/libssh2_session_init_ex.3) 1 Jun 2007 libssh2 0.15 --- Document: libssh2_session_startup(3) from libssh2 1.11.1-r11 (Chainguard OS) Source: https://github.com/libssh2/libssh2.git