n_datack_req.7

7号信令功能代码,为开源代码

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.TH N_DATACK_REQ 7 "2004/01/12 23:45:17" "LiS-2_16_18-8" "Linux STREAMS"
.SH NAME
.BR N_DATACK_REQ " (" N_datack_req_t )
\- data acknowledgment request
.SH DESCRIPTION
This is a user-originated primitive that requests that the network provider
acknowledge the
.BR N_DATA_IND (7)
that had previously been received with the receipt confirmation parameter set.
.SH SYNOPSIS
The format of the message is one
.B M_PROTO
message block and its structure is as follows:
.sp
.nf
\fC\s-1\
typedef struct {
    ulong PRIM_type;            /* always N_DATACK_REQ */
} N_datack_req_t;
\fR\s+1
.fi
.SH PARAMETERS
.TP
.I PRIM_type
Indicates the primitive type.
.SH STATE
This primitive is valid in state NS_DATA_XFER.
.SH "NEW STATE"
New State The resulting state remains the same
.RB ( NS_DATA_XFER ).
.SH RESPONSE
This primitive does not require any acknowledgments, although it may generate
a fatal (unrecoverable) error.  This is indicated via an
.B M_ERROR
.I STREAMS
message type (issued to the NS user specifying the errno value of
.BR EPROTO ),
which results in the failure of all system calls on that stream.
.SH ERRORS
The allowable errors are as follows:
.TP
.RB [ EPROTO ]
This indicates the following unrecoverable protocol condition:
.IP \- 4 
The network interface was found to be in an incorrect state.
.PP
.B Note:
If the interface is in the
.B NS_IDLE
state when the provider receives the
.B N_DATACK_REQ
primitive, then the NS provider should discard the request without generating
a fatal error.  If the NS provider had no knowledge of a previous
.BR N_DATA_IND (7)
with the receipt confirmation flag set, then the NS provider should just
ignore the request without generating a fatal error.
.SH VERSIONS
.PP
This manpage was written for
.B LiS\c
.
.[
LiS
.]
.br
The Network Provider Interface first appeared in SVR 4.
.[
svr4
.]
.br
This interface conforms to NPI Revision 2.
.XX
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npi
.]
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magic
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