6.4.8 N_EAck--Expedited Data Acknowledgement

Synopsis

#include <stream.h>
 #include <netx25/x25_proto.h >

 struct strbuf ctlb;

 struct xedatacf eack;
 .
 .
 .
 ctlb.len = sizeof(struct xedatacf);
 ctlb.buf = (char *)eack;

 putmsg(x25_fd, &ctlb, NULL, 0);

Description

N_EAck is used to acknowledge expedited data, carried by an X.25 Interrupt packet. The example shows a putmsg. Example 6-1 shows how a getmsg can be constructed. The control part of the Interrupt packet is defined by the xedatacf structure. There is no data part. An acknowledgment must be sent immediately on receipt of an Interrupt packet.

The xedatacf structure is shown below:

struct xedatacf {
 	unsigned char xl_type; /* Always XL_DAT */
 	unsigned char xl_command; /* Always N_EAck */
 };