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All Rights Reserved. .\" Portions Copyright (c) 1998, Sun Microsystems, Inc. All Rights Reserved. .\" .TH T_SNDUDATA 3NSL "May 7, 1998" .SH NAME t_sndudata \- send a data unit .SH SYNOPSIS .LP .nf #include \fBint\fR \fBt_sndudata\fR(\fBint\fR \fIfd\fR, \fBconst struct t_unitdata *\fR\fIunitdata\fR); .fi .SH DESCRIPTION .LP This routine is part of the \fBXTI\fR interfaces which evolved from the \fBTLI\fR interfaces. \fBXTI\fR represents the future evolution of these interfaces. However, \fBTLI\fR interfaces are supported for compatibility. When using a \fBTLI\fR routine that has the same name as an \fBXTI\fR routine, the \fBtiuser.h\fR header file must be used. Refer to the \fBTLI\fR \fBCOMPATIBILITY\fR section for a description of differences between the two interfaces. .sp .LP This function is used in connectionless-mode to send a data unit to another transport user. The argument \fIfd\fR identifies the local transport endpoint through which data will be sent, and \fIunitdata\fR points to a \fBt_unitdata\fR structure containing the following members: .sp .in +2 .nf struct netbuf addr; struct netbuf opt; struct netbuf udata; .fi .in -2 .sp .LP In \fIunitdata\fR, \fIaddr\fR specifies the protocol address of the destination user, \fIopt\fR identifies options that the user wants associated with this request, and \fIudata\fR specifies the user data to be sent. The user may choose not to specify what protocol options are associated with the transfer by setting the \fIlen\fR field of \fIopt\fR to zero. In this case, the provider uses the option values currently set for the communications endpoint. .sp .LP If the \fIlen\fR field of \fIudata\fR is zero, and sending of zero octets is not supported by the underlying transport service, the \fBt_sndudata()\fR will return -1 with \fBt_errno\fR set to \fBTBADDATA\fR. .sp .LP By default, \fBt_sndudata()\fR operates in synchronous mode and may wait if flow control restrictions prevent the data from being accepted by the local transport provider at the time the call is made. However, if \fBO_NONBLOCK\fR \fBis\fR \fBset\fR \fBby\fR \fBmeans\fR \fBof\fR \fBt_open\fR(3NSL) or \fBfcntl\fR(2), \fBt_sndudata()\fR will execute in asynchronous mode and will fail under such conditions. The process can arrange to be notified of the clearance of a flow control restriction by means of either \fBt_look\fR(3NSL) or the EM interface. .sp .LP If the amount of data specified in \fIudata\fR exceeds the TSDU size as returned in the \fItsdu\fR field of the \fIinfo\fR argument of \fBt_open\fR(3NSL) or \fBt_getinfo\fR(3NSL), a \fBTBADDATA\fR error will be generated. If \fBt_sndudata()\fR is called before the destination user has activated its transport endpoint (see \fBt_bind\fR(3NSL)), the data unit may be discarded. .sp .LP If it is not possible for the transport provider to immediately detect the conditions that cause the errors \fBTBADADDR\fR and \fBTBADOPT\fR, these errors will alternatively be returned by \fIt_rcvuderr.\fR Therefore, an application must be prepared to receive these errors in both of these ways. .sp .LP If the call is interrupted, \fBt_sndudata()\fR will return \fBEINTR\fR and the datagram will not be sent. .SH RETURN VALUES .LP Upon successful completion, a value of \fB0\fR is returned. Otherwise, a value of -1 is returned and \fBt_errno\fR is set to indicate an error. .SH VALID STATES .LP \fBT_IDLE\fR. .SH ERRORS .LP On failure, \fBt_errno\fR is set to one of the following: .sp .ne 2 .na \fB\fBTBADADDR\fR\fR .ad .RS 15n The specified protocol address was in an incorrect format or contained illegal information. .RE .sp .ne 2 .na \fB\fBTBADDATA\fR\fR .ad .RS 15n Illegal amount of data. A single send was attempted specifying a TSDU greater than that specified in the \fIinfo\fR argument, or a send of a zero byte TSDU is not supported by the provider. .RE .sp .ne 2 .na \fB\fBTBADF\fR\fR .ad .RS 15n The specified file descriptor does not refer to a transport endpoint. .RE .sp .ne 2 .na \fB\fBTBADOPT\fR\fR .ad .RS 15n The specified options were in an incorrect format or contained illegal information. .RE .sp .ne 2 .na \fB\fBTFLOW\fR\fR .ad .RS 15n \fBO_NONBLOCK\fR was set, but the flow control mechanism prevented the transport provider from accepting any data at this time. .RE .sp .ne 2 .na \fB\fBTLOOK\fR\fR .ad .RS 15n An asynchronous event has occurred on this transport endpoint. .RE .sp .ne 2 .na \fB\fBTNOTSUPPORT\fR\fR .ad .RS 15n This function is not supported by the underlying transport provider. .RE .sp .ne 2 .na \fB\fBTOUTSTATE\fR\fR .ad .RS 15n The communications endpoint referenced by \fIfd\fR is not in one of the states in which a call to this function is valid. .RE .sp .ne 2 .na \fB\fBTPROTO\fR\fR .ad .RS 15n 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 \fB(t_errno)\fR. .RE .sp .ne 2 .na \fB\fBTSYSERR\fR\fR .ad .RS 15n A system error has occurred during execution of this function. .RE .SH TLI COMPATIBILITY .LP The \fBXTI\fR and \fBTLI\fR 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. .SS "Interface Header" .LP The \fBXTI\fR interfaces use the header file, \fBxti.h.\fR \fBTLI\fR interfaces should \fInot\fR use this header. They should use the header: .br .in +2 #include .in -2 .SS "Error Description Values" .LP The \fBt_errno\fR values that can be set by the \fBXTI\fR interface and cannot be set by the \fBTLI\fR interface are: .br .in +2 \fBTPROTO\fR .in -2 .br .in +2 \fBTBADADDR\fR .in -2 .br .in +2 \fBTBADOPT\fR .in -2 .br .in +2 \fBTLOOK\fR .in -2 .br .in +2 \fBTOUTSTATE\fR .in -2 .SS "Notes" .LP Whenever this function fails with \fBt_error\fR set to \fBTFLOW,\fR \fBO_NONBLOCK\fR must have been set. .SS "Option Buffers" .LP The format of the options in an \fBopt\fR buffer is dictated by the transport provider. Unlike the \fBXTI\fR interface, the \fBTLI\fR interface does not fix the buffer format. .SH ATTRIBUTES .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ MT Level Safe .TE .SH SEE ALSO .LP .BR fcntl (2), .BR t_alloc (3NSL), .BR t_bind (3NSL), .BR t_error (3NSL), .BR t_getinfo (3NSL), .BR t_look (3NSL), .BR t_open (3NSL), .BR t_rcvudata (3NSL), .BR t_rcvuderr (3NSL), .BR attributes (7)