6.4.6 N_DC--Clear Confirm

Synopsis

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

 struct strbuf ctlb;
 struct strbuf datab;

 struct xdcnff disc;
 char          cud[MAX_LENGTH];
 .
 .
 .
 ctlb.len = sizeof(struct xdcnff);
 ctlb.buf = (char *)disc;

 datab.len = cudlen;
 datab.buf = cud;

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

Description

N_DC is used to confirm a previous clear indication (N_DI). The example shows a putmsg. Example 6-1 shows how a getmsg can be constructed. The control part of the Data packet is defined by the xdcnff structure. If Fast Select is in use, the data part of the message contains any clear user data.

The xdcnff structure is shown below:

struct xdcnff {
 	unsigned char xl_type; /* Always XL_CTL */
 	unsigned char xl_command; /* Always N_DC */
 	unsigned char indicated_qos; /* When set, facilities
 	                                indicated */
 	struct qosformat rqos; /* If indicated_qos is set, holds
                               facilities and CONS qos */
 }; 

The members of the xdcnff structure are: