12.4.2 Sending Interrupt and Reset Packets

An interrupt packet may be sent in the following manner. The interrupt user data is contained in intr:

int s;
 char intr = 0;       /* set this variable to contain the interrupt
                       * user data (in this case 0) */
 error = send(s, &intr, 1, MSG_OOB);

If the link supports 1984 X.25, you may send up to 32 bytes of interrupt data. On 1980 links, you may send only one byte.

A reset packet may be sent in the following manner:

X25_CAUSE_DIAG diag;
 int error, s;
 diag.flags = 0;
 diag.datalen = 2;
 diag.data[0] = 0;          /* cause */
 diag.data[1] = 67;         /* diagnostic */
 error = ioctl(s, X25_WR_CAUSE_DIAG, &diag);

This will cause a Reset to be sent with the cause code and diagnostic specified by the user. See "12.7.8 Accessing the Diagnostic Code" of this chapter for more information.