pub unsafe extern "C" fn switch_channel_get_variable_buf(
channel: *mut switch_channel_t,
varname: *const c_char,
buf: *mut c_char,
buflen: switch_size_t,
) -> switch_status_tpub unsafe extern "C" fn switch_channel_get_variable_buf(
channel: *mut switch_channel_t,
varname: *const c_char,
buf: *mut c_char,
buflen: switch_size_t,
) -> switch_status_t