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t_sync (3)
  • >> t_sync (3) ( Solaris man: Библиотечные вызовы )
  •  

    NAME

    t_sync - synchronize transport library
     
    

    SYNOPSIS

    #include <xti.h>
    
    
    
    int t_sync(int fd);
    

     

    DESCRIPTION

    This routine is part of the XTI interfaces which evolved from the TLI interfaces. XTI represents the future evolution of these interfaces. However, TLI interfaces are supported for compatibility. When using a TLI routine that has the same name as an XTI routine, the tiuser.h header file must be used. Refer to the TLI COMPATIBILITY section for a description of differences between the two interfaces.

    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 an uninitialized file descriptor (obtained by means of a open(2), dup(2) or as a result of a fork(2) and exec(2)) to an initialized transport endpoint, assuming that the file descriptor referenced a transport endpoint, by updating and allocating the necessary library data structures. 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(2), 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 transport endpoint. The function t_sync() returns the current state of the transport endpoint 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 endpoint's state after a t_sync() is issued.

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

    RETURN VALUES

    On successful completion, the state of the transport endpoint is returned. Otherwise, a value of -1 is returned and t_errno is set to indicate an error. The state returned is 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 is set to one of the following:

    TBADF

    The specified file descriptor does not refer to a transport endpoint. This error may be returned when the fd has been previously closed or an erroneous number may have been passed to the call.

    TPROTO

    This error indicates that a communication problem has been detected between XTI and the transport provider for which there is no other suitable XTI error (t_errno).

    TSTATECHNG

    The transport endpoint is undergoing a state change.

    TSYSERR

    A system error has occurred during execution of this function.

     

    TLI COMPATIBILITY

    The XTI and TLI interface definitions have common names but use different header files. This, and other semantic differences between the two interfaces are described in the subsections below.  

    Interface Header

    The XTI interfaces use the header file, xti.h. TLI interfaces should not use this header. They should use the header:
    #include <tiuser.h>  

    Error Description Values

    The t_errno value that can be set by the XTI interface and cannot be set by the TLI interface is:
    TPROTO  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    MT LevelSafe

     

    SEE ALSO

    dup(2), exec(2), fork(2), open(2), attributes(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    TLI COMPATIBILITY
    Interface Header
    Error Description Values
    ATTRIBUTES
    SEE ALSO


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