synchronize transport library
cc [options] file -lnsl
int t_sync(int fd);
This function is a TLI/XTI local management routine used
to synchronize TLI/XTI data structures and protocol
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
or as a result of a
to an initialized transport endpoint,
assuming that the 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.
On successful completion, t_sync returns the current state
of the transport 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.
the file descriptor for the transport endpoint for which data
structures will be synchronized.
t_sync may be issued from any valid state except T_UNINIT
and has no effect on the entry state at exit.
X/Open® Transport Interface Library (shared object)
Network Services Library (shared object)
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,
those activities should be coordinated
so as not to violate the state of the provider.
t_sync returns the state of the transport provider
(the endpoint specified by fd) on successful
completion. On failure, -1 is returned
and t_errno is set to indicate the error.
The state returned may be one of the following:
outgoing connection pending (connection mode only)
incoming connection pending (connection mode only)
data transfer (connection mode only)
outgoing orderly release (waiting for an orderly release indication)
(connection mode only)
incoming orderly release (waiting for an orderly release request)
(connection mode only)
On failure, t_errno may be set to one of the following:
The specified file descriptor does not refer to a transport endpoint.
The transport provider is undergoing a state change.
A system error has occurred during execution of this function.
A communication problem has been detected with the transport provider
and there is no other value of t_errno to describe
the error condition.
If the transport endpoint specified by fd
is undergoing a state transition when t_sync
is called, the function will fail.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004