t_sync(3N)                        SDK R4.11                       t_sync(3N)


NAME
       tsync - synchronize transport library

SYNOPSIS
       #include <tiuser.h>

       int tsync (int fd);

DESCRIPTION
       For the transport endpoint specified by fd, tsync 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 tsync 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.  tsync
       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 tsync is issued.

       If the provider is undergoing a state transition when tsync is
       called, the function will fail.

       On failure, terrno 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).
       UNIX System V Network Programmer's Guide.

DIAGNOSTICS
       tsync returns the state of the transport provider on successful
       completion and -1 on failure and terrno is set to indicate the
       error.  The state returned may be one of the following:

       TUNBND            unbound

       TIDLE             idle

       TOUTCON           outgoing connection pending

       TINCON            incoming connection pending

       TDATAXFER         data transfer

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

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


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