Hallo, dies ist ein Test.

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'\" te .\" Copyright (c) 1994, The X/Open Company Ltd. All rights reserved. .\" Portions Copyright (c) 1989, AT&T. All rights reserved. .\" Portions Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved. .\" Oracle gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at http://www.opengroup.org/bookstore/. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html. This notice shall appear on any product containing this material. .TH t_rcvvudata 3C "7 May 1998" "Oracle Solaris 11.4" "Standard C Library Functions" .SH NAME t_rcvvudata \- receive a data unit into one or more noncontiguous buffers .SH SYNOPSIS .LP .nf #include <xti.h> \fBint\fR \fBt_rcvvudata\fR(\fBint\fR \fIfd\fR, \fBstruct t_unitdata *\fR\fIunitdata\fR, \fBstruct t_iovec *\fR\fIiov\fR, \fBunsigned int\fR \fIiovcount\fR, \fBint *\fR\fIflags\fR); .fi .SH DESCRIPTION .sp .LP This function is used in connectionless mode to receive a data unit from another transport user. The argument \fIfd\fR identifies the local transport endpoint through which data will be received, \fIunitdata\fR holds information associated with the received data unit, \fIiovcount\fR contains the number of non-contiguous udata buffers which is limited to \fBT_IOV_MAX,\fR which is an implementation-defined value of at least 16, and \fIflags\fR is set on return to indicate that the complete data unit was not received. If the limit on \fIiovcount\fR is exceeded, the function fails with \fBTBADDATA\fR. The argument \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 .sp .LP The \fImaxlen\fR field of \fIaddr\fR and \fIopt\fR must be set before calling this function to indicate the maximum size of the buffer for each. The \fIudata\fR field of \fBt_unitdata\fR is not used. The \fIiov_len\fR and \fIiov_base\fR fields of "\fIiov\fR\fB0\fR" through \fIiov [iovcount-1]\fR must be set before calling \fBt_rcvvudata()\fR to define the buffer where the userdata will be placed. If the maxlen field of \fIaddr\fR or \fIopt\fR is set to zero then no information is returned in the \fIbuf\fR field for this parameter. .sp .LP On return from this call, \fIaddr\fR specifies the protocol address of the sending user, \fIopt\fR identifies options that were associated with this data unit, and \fIiov\fR\fB[0]\fR\fI.iov_base\fR through \fIiov [iovcount-1].iov_base\fR contains the user data that was received. The return value of \fBt_rcvvudata()\fR is the number of bytes of user data given to the user. .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 .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_rcvvudata()\fR operates in synchronous mode and waits for a data unit to arrive if none is currently available. However, if \fBO_NONBLOCK\fR is set by means of \fBt_open\fR(3C) or \fBfcntl\fR(2), \fBt_rcvvudata()\fR executes in asynchronous mode and fails if no data units are available. .sp .LP If the buffers defined in the \fIiov[]\fR array are not large enough to hold the current data unit, the buffers will be filled and \fBT_MORE\fR will be set in flags on return to indicate that another \fBt_rcvvudata()\fR should be called to retrieve the rest of the data unit. Subsequent calls to \fBt_rcvvudata()\fR will return zero for the length of the address and options, until the full data unit has been received. .SH RETURN VALUES .sp .LP On successful completion, \fBt_rcvvudata()\fR returns the number of bytes received. Otherwise, it returns -1 on failure and \fBt_errno\fR is set to indicate the error. .SH VALID STATES .sp .LP \fBT_IDLE\fR. .SH ERRORS .sp .LP On failure, \fBt_errno\fR is set to one of the following: .sp .ne 2 .mk .na \fB\fBTBADDATA\fR\fR .ad .RS 15n .rt \fIiovcount\fR is greater than \fBT_IOV_MAX.\fR .RE .sp .ne 2 .mk .na \fB\fBTBADF\fR\fR .ad .RS 15n .rt The specified file descriptor does not refer to a transport endpoint. .RE .sp .ne 2 .mk .na \fB\fBTBUFOVFLW\fR\fR .ad .RS 15n .rt The number of bytes allocated for the incoming protocol address or options (\fImaxlen\fR) is greater than \fB0\fR but not sufficient to store the information. The unit data information to be returned in \fIunitdata\fR will be discarded. .RE .sp .ne 2 .mk .na \fB\fBTLOOK\fR\fR .ad .RS 15n .rt An asynchronous event has occurred on this transport endpoint and requires immediate attention. .RE .sp .ne 2 .mk .na \fB\fBTNODATA\fR\fR .ad .RS 15n .rt \fBO_NONBLOCK\fR was set, but no data units are currently available from the transport provider. .RE .sp .ne 2 .mk .na \fB\fBTNOTSUPPORT\fR\fR .ad .RS 15n .rt This function is not supported by the underlying transport provider. .RE .sp .ne 2 .mk .na \fB\fBTOUTSTATE\fR\fR .ad .RS 15n .rt 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 .mk .na \fB\fBTPROTO\fR\fR .ad .RS 15n .rt 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 .mk .na \fB\fBTSYSERR\fR\fR .ad .RS 15n .rt A system error has occurred during execution of this function. .RE .SH TLI COMPATIBILITY .sp .LP In the \fBTLI\fR interface definition, no counterpart of this routine was defined. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .TS tab( ) box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ MT Level Safe .TE .sp .SH SEE ALSO .sp .LP \fBfcntl\fR(2), \fBt_alloc\fR(3C), \fBt_open\fR(3C), \fBt_rcvudata\fR(3C), \fBt_rcvuderr\fR(3C), \fBt_sndudata\fR(3C), \fBt_sndvudata\fR(3C), \fBattributes\fR(7)