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10 .TH T_RCVUDERR 3NSL "May 7, 1998"
12 t_rcvuderr \- receive a unit data error indication
20 \fBint\fR \fBt_rcvuderr\fR(\fBint\fR \fIfd\fR, \fBstruct t_uderr *\fR\fIuderr\fR);
26 This routine is part of the \fBXTI\fR interfaces which evolved from the
27 \fBTLI\fR interfaces. \fBXTI\fR represents the future evolution of these
28 interfaces. However, \fBTLI\fR interfaces are supported for compatibility. When
29 using a \fBTLI\fR routine that has the same name as an \fBXTI\fR routine, the
30 \fBtiuser.h\fR header file must be used. Refer to the \fBTLI\fR
31 \fBCOMPATIBILITY\fR section for a description of differences between the two
35 This function is used in connectionless-mode to receive information concerning
36 an error on a previously sent data unit, and should only be issued following a
37 unit data error indication. It informs the transport user that a data unit with
38 a specific destination address and protocol options produced an error. The
39 argument \fIfd\fR identifies the local transport endpoint through which the
40 error report will be received, and \fIuderr\fR points to a \fBt_uderr\fR
41 structure containing the following members:
53 The \fImaxlen\fR field of \fIaddr\fR and \fIopt\fR must be set before calling
54 this function to indicate the maximum size of the buffer for each. If this
55 field is set to zero for \fIaddr\fR or \fIopt\fR, no information is returned
56 in the \fIbuf\fR field of this parameter.
59 On return from this call, the \fIaddr\fR structure specifies the destination
60 protocol address of the erroneous data unit, the \fIopt\fR structure identifies
61 options that were associated with the data unit, and \fBerror\fR specifies a
62 protocol-dependent error code.
65 If the user does not care to identify the data unit that produced an error,
66 \fIuderr\fR may be set to a null pointer, and \fBt_rcvuderr()\fR will simply
67 clear the error indication without reporting any information to the user.
71 Upon successful completion, a value of \fB0\fR is returned. Otherwise, a
72 value of -1 is returned and \fBt_errno\fR is set to indicate an error.
80 On failure, \fBt_errno\fR is set to one of the following:
87 The specified file descriptor does not refer to a transport endpoint.
96 The number of bytes allocated for the incoming protocol address or options
97 \fI(maxlen)\fR is greater than 0 but not sufficient to store the information.
98 The unit data error information to be returned in \fIuderr\fR will be
105 \fB\fBTNOTSUPPORT\fR\fR
108 This function is not supported by the underlying transport provider.
117 No unit data error indication currently exists on the specified transport
124 \fB\fBTOUTSTATE\fR\fR
127 The communications endpoint referenced by \fIfd\fR is not in one of the states
128 in which a call to this function is valid.
137 This error indicates that a communication problem has been detected between XTI
138 and the transport provider for which there is no other suitable XTI error
148 A system error has occurred during execution of this function.
151 .SH TLI COMPATIBILITY
154 The \fBXTI\fR and \fBTLI\fR interface definitions have common names but use
155 different header files. This, and other semantic differences between the two
156 interfaces are described in the subsections below.
157 .SS "Interface Header"
160 The \fBXTI\fR interfaces use the header file, \fBxti.h\fR. \fBTLI\fR interfaces
161 should \fInot\fR use this header. They should use the header:
164 \fB#include <tiuser.h>\fR
166 .SS "Error Description Values"
169 The \fBt_errno\fR values \fBTPROTO\fR and \fBTOUTSTATE\fR can be set by the
170 \fBXTI\fR interface but not by the \fBTLI\fR interface.
173 A \fBt_errno\fR value that this routine can return under different
174 circumstances than its \fBXTI\fR counterpart is \fBTBUFOVFLW.\fR It can be
175 returned even when the \fBmaxlen\fR field of the corresponding buffer has been
180 The format of the options in an \fBopt\fR buffer is dictated by the transport
181 provider. Unlike the \fBXTI\fR interface, the \fBTLI\fR interface does not fix
186 See \fBattributes\fR(5) for descriptions of the following attributes:
194 ATTRIBUTE TYPE ATTRIBUTE VALUE
202 \fBt_rcvudata\fR(3NSL), \fBt_sndudata\fR(3NSL), \fBattributes\fR(5)