extern int null_trip

(void* v, char* ibuf, int ilen, char* obuf,
  int omaxlen)

Initiates a round-trip transaction.

Documentation

Initiates a round-trip transaction.

Parameters:

v - An opaque pointer returned by null_start.
ibuf - A character pointer to the send buffer.
ilen - The length of the send buffer, in octets.
obuf - A character pointer to the receive buffer.
omaxlen - The length of the receive buffer, in octets.

Returns:

The number of octets received, or one of:

• NULL_ERROR
• NULL_BUSY
• NULL_DONE

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