NAME

t_sync − synchronize transport library

SYNOPSIS

cc [ flag ... ] file ... −lnsl [ library ... ]

#include <tiuser.h>

int t_sync(int fildes);

MT-LEVEL

MT-Safe

DESCRIPTION

For the transport endpoint specified by fildes, t_sync() synchronizes the data structures managed by the transport library with information from the underlying transport provider.  In doing so, it can convert a raw file descriptor (obtained using open(2), dup(2), or as a result of a fork(2) and exec(2)) to an initialized transport endpoint, assuming that file descriptor referenced a transport provider.  This function also allows two cooperating processes to synchronize their interaction with a transport provider. 

For example, if a process fork()s a new process and issues an exec(), the new process must issue a t_sync() to build the private library data structure associated with a transport endpoint and to synchronize the data structure with the relevant provider information. 

It is important to remember that the transport provider treats all users of a transport endpoint as a single user.  If multiple processes are using the same endpoint, they should coordinate their activities so as not to violate the state of the provider.  t_sync() returns the current state of the provider to the user, thereby enabling the user to verify the state before taking further action.  This coordination is only valid among cooperating processes; it is possible that a process or an incoming event could change the provider’s state after a t_sync() is issued. 

If the provider is undergoing a state transition when t_sync() is called, the function will fail. 

RETURN VALUES

t_sync() returns the state of the transport provider on successful completion.  t_sync() returns -1 on failure, t_errno is set to indicate the error, and possibly errno is set.  The state returned may be one of the following:

T_UNBND unbound

T_IDLE idle

T_OUTCON outgoing connection pending

T_INCON incoming connection pending

T_DATAXFER data transfer

T_OUTREL outgoing orderly release (waiting for an orderly release indication)

T_INREL incoming orderly release (waiting for an orderly release request)

ERRORS

On failure, t_errno will be set to one of the following:

TBADF The specified file descriptor does not refer to a transport endpoint. 

TSTATECHNG The transport provider is undergoing a state change. 

TSYSERR A system error has occurred during execution of this function, errno will be set to the specific error. 

SEE ALSO

dup(2), exec(2), fork(2), open(2)

SunOS 5.1 Network Interfaces Programmer’s Guide

NOTES

This interface is safe in multithreaded applications. 

SunOS 5.2  —  Last change: 22 Jan 1993