Convenience macro for libssh2_session_init_ex(3) calls
#include <libssh2.h>
LIBSSH2_SESSION * libssh2_session_init(void);
This is a macro defined in a public libssh2 header file that is using the underlying function libssh2_session_init_ex(3).
See libssh2_session_init_ex(3)
libssh2_session_init_ex(3)