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All Rights Reserved. .\" Portions Copyright (c) 1998, Sun Microsystems, Inc. All Rights Reserved. .\" .TH T_SNDVUDATA 3NSL "Aug 23, 2001" .SH NAME t_sndvudata \- send a data unit from one or more noncontiguous buffers .SH SYNOPSIS .LP .nf #include \fBint\fR \fBt_sndvudata\fR(\fBint\fR \fIfd\fR, \fBstruct t_unitdata *\fR\fIunitdata\fR, \fBstruct t_iovec *\fR\fIiov\fR, \fBunsigned int\fR \fIiovcount\fR); .fi .SH DESCRIPTION .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, \fIiovcount\fR contains the number of non-contiguous \fIudata\fR buffers and is limited to an implementation-defined value given by \fBT_IOV_MAX\fR which is at least 16, 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 If the limit on \fIiovcount\fR is exceeded, the function fails with \fBTBADDATA\fR. .sp .LP In \fBunitdata\fR, \fIaddr\fR specifies the protocol address of the destination user, and \fIopt\fR identifies options that the user wants associated with this request. The \fIudata\fR field is not used. 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 may use default options. .sp .LP The data to be sent is identified by \fIiov\fR\fB[0]\fR\fI\fR through \fIiov [iovcount-1]\fR\fB\&.\fR .sp .LP Note that the limit on the total number of bytes available in all buffers passed: .sp .in +2 .nf \fIiov(0).iov_len + . . + iov(iovcount-1).iov_len \fR .fi .in -2 .sp .LP may be constrained by implementation limits. If no other constraint applies, it will be limited by \fBINT_MAX\fR. In practice, the availability of memory to an application is likely to impose a lower limit on the amount of data that can be sent or received using scatter/gather functions. .sp .LP By default, \fBt_sndvudata()\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 is set by means of \fBt_open\fR(3NSL) or \fBfcntl\fR(2), \fBt_sndvudata()\fR executes 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 \fIiov\fR\fB0\fR\fI\fR through \fIiov [iovcount-1]\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), or is zero and sending of zero octets is not supported by the underlying transport service, a \fBTBADDATA\fR error is generated. If \fBt_sndvudata()\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 \fBt_rcvuderr\fR(3NSL). An application must therefore be prepared to receive these errors in both of these ways. .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. .RS +4 .TP .ie t \(bu .el o 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 .RS +4 .TP .ie t \(bu .el o \fIiovcount\fR is greater than \fBT_IOV_MAX.\fR .RE .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 \fBi\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 In the \fBTLI\fR interface definition, no counterpart of this routine was defined. .SH ATTRIBUTES .LP See \fBattributes\fR(5) 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 \fBfcntl\fR(2), \fBt_alloc\fR(3NSL), \fBt_open\fR(3NSL), \fBt_rcvudata\fR(3NSL), \fBt_rcvvudata\fR(3NSL) \fBt_rcvuderr\fR(3NSL), \fBt_sndudata\fR(3NSL), \fBattributes\fR(5)