t_listen.3 (2010 09)

t
t_listen(3) t_listen(3)
NAME
t_listen() - listen for a connect request
SYNOPSIS
#include <xti.h> /* for X/OPEN Transport Interface - XTI */
/* or */
#include <tiuser.h> /* for Transport Layer Interface - TLI */
int t_listen (fd, call);
int fd;
struct t_call *call;
DESCRIPTION
The t_listen() function listens for a connect request from a calling transport user. fd identifies the
local transport endpoint where connect indications arrive. On return, call contains information describ-
ing the connect indication. The parameter call points to a
t_call structure which contains the follow-
ing members:
struct netbuf addr;
struct netbuf opt;
struct netbuf udata;
int sequence;
The type netbuf structure is defined in the <xti.h> or <tiuser.h> header file. This structure,
which is used to define buffer parameters, has the following members:
unsigned int maxlen maximum byte length of the data buffer
unsigned int len actual byte length of data written to buffer
char *buf points to buffer location
In call , addr returns the protocol address of the calling transport user. This address is in a format usable
in future calls to
t_connect(). Note, however that t_connect() may fail for other reasons, for
example [TADDRBUSY].
opt returns protocol-specific parameters associated with the connect request. For XTI over the OSI tran-
sport provider, struct
isoco_options
should be used. For TLI, see the documentation for the tran-
sport provider being used.
udata returns any user data sent by the caller on the connect request.
sequence is a number that uniquely identifies the returned connect indication. The value of sequence
enables the user to listen for multiple connect indications before responding to any of them.
Since this function returns values for the addr, opt , and udata fields of call , the maxlen field of each
must be set before issuing the
t_listen to indicate the maximum size of the buffer for each.
By default,
t_listen executes in synchronous mode and waits for a connect indication to arrive before
returning to the user. However, if O_NONBLOCK is set (via t_open() or fcntl()), t_listen() exe-
cutes asynchronously, reducing to a poll for existing connect indications. If none are available, it returns
−1 and sets t_errno to [TNODATA].
Valid States
T_IDLE, T_INCON
Caveats
Some transport providers do not differentiate between a connect indication and the connection itself. If
this is the case, a successful return of t_listen() indicates an existing connection (see Appendix B,
"Internet Protocol-specific Information," of the CAE Specification X/Open Transport Interface (XTI)
manual).
Fork Safety
t_listen is not fork-safe.
RETURN VALUE
Upon successful completion, a value of 0 is returned Otherwise, a value of −1 it returned and
t_errno
is set to indicate the error.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1