t_sndudata man page on Ultrix

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t_sndudata(3xti)					      t_sndudata(3xti)

Name
       t_sndudata - send a data unit

Syntax
       #include <xti.h>

       int t_sndudata(fd, unitdata)
       int fd;
       struct t_unitdata *unitdata;

Arguments
       fd	 Identifies  the  local	 transport endpoint through which data
		 will be sent.

       unitdata	 Points to a t_unitdata	 structure  containing	the  following
		 members:
		 struct netbuf addr;
		 struct netbuf opt;
		 struct netbuf udata;

		 The members have the following meanings:

		 addr	     Specifies the protocol address of the destination
			     user.

		 opt	     Identifies	 protocol-specific  options  that  the
			     user wants associated with the request.

		 udata	     Specifies the user data to be sent.

Description
       This  function  is  used	 in connectionless mode to send a data unit to
       another transport user.

       ──────────────────────────────────────────────────
       Parameters		Before Call   After Call
       ──────────────────────────────────────────────────
       fd			x	      /
       unitdata->addr.maxlen	/	      /
       unitdata->addr.len	x	      /
       unitdata->opt.maxlen	/	      /
       unitdata->opt.len	x	      /
       unitdata->opt.buf	?(?)	      /
       unitdata->udata.maxlen	/	      /
       unitdata->udata.len	x	      /
       unitdata->udata.buf	x(x)	      /
       ──────────────────────────────────────────────────

       If the len field of udata is zero, and sending of zero  octets  is  not
       supported  by  the  underlying  transport  service, the returns -1 with
       t_errno set to [TBADDATA].

       By default, operates in synchronous mode and may wait if	 flow  control
       restrictions  prevent  the data from being accepted by the local trans‐
       port provider at the time the call is made. However, if	O_NONBLOCK  is
       set  by	means of or executes in asynchronous mode and fails under such
       conditions. The process can arrange to be notified of the clearance  of
       a flow control restriction by means of

       If  the	amount	of  data  specified  in udata exceeds the TSDU size as
       returned in the tsdu field of the info argument of or the provider gen‐
       erates  a  protocol error. See [TSYSERR] under the DIAGNOSTICS section.
       If is issued before the destination user has  activated	its  transport
       endpoint, the data unit can be discarded.

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.

       [TOUTSTATE]	   The	function  was  issued in the wrong sequence on
			   the transport endpoint referenced by fd.

       [TFLOW]		   O_NONBLOCK was set, but the flow control  mechanism
			   prevented the transport provider from accepting any
			   data at this time.

       [TBADDATA]	   Illegal amount of data; zero octets	are  not  sup‐
			   ported.

       [TLOOK]		   An asynchronous event has occurred on the transport
			   endpoint.

       [TNOTSUPPORT]	   This function is not supported  by  the  underlying
			   transport provider.

       [TSYSERR]	   A  system  error  has  occurred during execution of
			   this function. A protocol  error  cannot  cause  to
			   fail	 until	a  subsequent  access of the transport
			   endpoint.

See Also
       fcntl(2),  t_alloc(3xti),  t_open(3xti),	  t_rcvudata(3xti),   t_rcvud‐
       err(3xti)

							      t_sndudata(3xti)
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