Network Interface Guide


The client releases the connection similar to the way the server releases it. The client processes incoming data until t_rcv(3NSL) fails. When the server releases the connection (using either t_snddis(3NSL) or t_sndrel(3NSL)), t_rcv(3NSL) fails and sets t_errno to TLOOK. The client then processes the connection release as follows:

if ((t_errno == TLOOK) && (t_look(fd) == T_ORDREL)) {
   if (t_rcvrel(fd) == -1) {
      t_error("t_rcvrel failed");
 	if (t_sndrel(fd) == -1) {
      t_error("t_sndrel failed");

Each event on the client's transport endpoint is checked for an orderly release request. When one is received, the client calls t_rcvrel(3NSL) to process the request and t_sndrel(3NSL) to send the response release request. The client then exits, closing its transport endpoint.

If a transport provider does not support the orderly release, use abortive release with t_snddis(3NSL) and t_rcvdis(3NSL). Each user must take steps to prevent data loss. For example, use a special byte pattern in the data stream to indicate the end of a conversation.