ultrix man page for t_getinfo

t_getinfo(3xti) 														   t_getinfo(3xti)

Name
       t_getinfo - get protocol-specific service information

Syntax
       #include <xti.h>

       int t_getinfo(fd, info)
       int fd;
       struct t_info *info;

Arguments
       fd	 Identifies  the  file descriptor that is associated with the underlying transport protocol from which the current characteristics
		 are to be returned.

       info	 Specifies the structure that is used to return the same information returned by Points to a t_info structure which  contains  the
		 following members:

		 long addr;	/* max size of the transport protocol address */

		 long options;	/* max number of bytes of protocol-specific options */

		 long tsdu;	/* max size of a transport service data unit (TSDU) */

		 long etsdu;	/* max size of an expedited transport service data unit (ETSDU) */

		 long connect;	/* max amount of data allowed on connection establishment functions */

		 long discon;	/* max amount of data allowed on and functions */

		 long servtype; /* service type supported by the transport provider */

		 The values of the fields have the following meanings:

		 addr	     A value greater than or equal to zero indicates the maximum size of a transport protocol address; a value of -1 spec-
			     ifies that there is no limit on the address size; and a value of -2 specifies that the transport  provider  does  not
			     provide user access to transport protocol addresses.

		 options     A value greater than or equal to zero indicates the maximum number of bytes of protocol-specific options supported by
			     the provider; a value of -1 specifies that there is no limit on the option size and a value of -2 specifies that  the
			     transport provider does not support user-settable options.

		 tsdu	     A	value greater than zero specifies the maximum size of a transport service data unit (TSDU); a value of zero speci-
			     fies that the transport provider does not support the concept of TSDU, although it does support the sending of a data
			     stream  with  no  logical boundaries preserved across a connection; a value of -1 specifies that there is no limit on
			     the size of a TSDU and a value of -2 specifies that the transfer of normal data is not  supported	by  the  transport
			     provider.

		 etsdu	     A	value greater than zero specifies the maximum size of an expedited transport service data unit (ETSDU); a value of
			     zero specifies that the transport provider does not support the concept of ETSDU, although it  it	does  support  the
			     sending of an expedited data stream with no logical boundaries preserved across a connection; a value of -1 specifies
			     that there is no limit on the size of ETSDU; and a value of -2 specifies that the transfer of expedited data  is  not
			     supported by the transport provider.

		 connect     A	value  greater	than  or equal to zero specifies the maximum amount of data that may be associated with connection
			     establishment functions; a value of -1 specifies that there is no limit on the amount of data sent during	connection
			     establishment; and a value of -2 specifies that the transport provider does not allow data to be sent with connection
			     establishment functions.

		 discon      A value greater than or equal to zero specifies the maximum amount of data that may be associated with the and  func-
			     tions;  a value -1 specifies that there is no limit on the amount of data sent with these abortive release functions;
			     and a value of -2 specifies that the transport provider does not allow data to be	sent  with  the  abortive  release
			     functions.

		 servtype    This field specifies the service type supported by the transport provider, as described.

		 If a transport user is concerned with protocol independence, the sizes may be accessed to determine how large the buffers must be
		 to hold each piece of information. Alternatively, the function can be used to allocate these  buffers.  An  error  results  if  a
		 transport  user  exceeds the allowed data size on any function. The value of each field may change as a result of option negotia-
		 tion, and enables a user to retrieve the current characteristics of the underlying transport protocol.

		 The servtype field of info specifies one of the following values on return:

		 T_COTS      The transport provider supports a connection-mode service but does not support the optional orderly release facility.

		 T_COTS_ORD  The transport provider supports a connection-mode service with the optional orderly release facility.

		 T_CLTS      The transport provider supports a connectionless-mode service. For this service type, returns -2 for ETSDU, and

Description
       This function returns the current characteristics of the underlying transport protocol associated with file descriptor fd. The info  struc-
       ture  is used to return the same information returned by This function enables a transport user to access this information during any phase
       of communications.

       -----------------------------------------
       Parameters      Before Call   After Call
       -----------------------------------------
       fd	       x	     /
       info->addr      /	     x
       info->options   /	     x
       info->tsdu      /	     x
       info->etsdu     /	     x
       info->connect   /	     x
       info->discon    /	     x
       info->sertype   /	     x
       -----------------------------------------

Return Values
       Upon successful completion, a value of 0 is returned. On failure,  a value of -1 is returned, and t_errno is set to indicate the error.

Diagnostics
       On failure, t_errno is set to one of the following:

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

       [TNOTSUPPORT]	   This function is not supported by the current implementation of XTI.

       [TSYSERR]	   A system error has occurred during execution of this function.

See Also
       t_alloc(3xti), t_open(3xti)

																   t_getinfo(3xti)