ultrix man page for t_sndudata

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 gener-
       ates  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 supported.

       [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_rcvuderr(3xti)

																  t_sndudata(3xti)