Function switch_channel_get_variable_dup

pub unsafe extern "C" fn switch_channel_get_variable_dup(
    channel: *mut switch_channel_t,
    varname: *const c_char,
    dup: switch_bool_t,
    idx: c_int,
) -> *const c_char

\brief Retrieve a variable from a given channel \param channel channel to retrieve variable from \param varname the name of the variable \return the value of the requested variable