'\" t
.\"     Title: cfg80211_testmode_alloc_reply_skb
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Test mode
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "CFG80211_TESTMODE_AL" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Test mode"
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.SH "NAME"
cfg80211_testmode_alloc_reply_skb \- allocate testmode reply
.SH "SYNOPSIS"
.HP \w'struct\ sk_buff\ *\ cfg80211_testmode_alloc_reply_skb('u
.BI "struct sk_buff * cfg80211_testmode_alloc_reply_skb(struct\ wiphy\ *\ " "wiphy" ", int\ " "approxlen" ");"
.SH "ARGUMENTS"
.PP
\fIwiphy\fR
.RS 4
the wiphy
.RE
.PP
\fIapproxlen\fR
.RS 4
an upper bound of the length of the data that will be put into the skb
.RE
.SH "DESCRIPTION"
.PP
This function allocates and pre\-fills an skb for a reply to the testmode command\&. Since it is intended for a reply, calling it outside of the
\fItestmode_cmd\fR
operation is invalid\&.
.PP
The returned skb is pre\-filled with the wiphy index and set up in a way that any data that is put into the skb (with
\fBskb_put\fR,
\fBnla_put\fR
or similar) will end up being within the
\fBNL80211_ATTR_TESTDATA\fR
attribute, so all that needs to be done with the skb is adding data for the corresponding userspace tool which can then read that data out of the testdata attribute\&. You must not modify the skb in any other way\&.
.PP
When done, call
\fBcfg80211_testmode_reply\fR
with the skb and return its error code as the result of the
\fItestmode_cmd\fR
operation\&.
.SH "RETURN"
.PP
An allocated and pre\-filled skb\&.
\fBNULL\fR
if any errors happen\&.
.SH "AUTHOR"
.PP
\fBJohannes Berg\fR <\&johannes@sipsolutions.net\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br