NAME

t_sync − synchronize transport library

SYNOPSIS

#include <tiuser.h>

int t_sync (fd)
int fd;

DESCRIPTION

For the transport endpoint specified by fd, 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 via 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 forks 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. 

On failure, t_errno may 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. 

SEE ALSO

dup(2), exec(2), fork(2), open(2).  CX/UX Networking Reference Manual

DIAGNOSTICS

t_sync returns the state of the transport provider on successful completion and -1 on failure and t_errno is set to indicate the error.  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)

CX/UX Networking