'\" t
.\"     Title: struct irb
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: The ccw bus
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "STRUCT IRB" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "The ccw bus"
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.SH "NAME"
struct_irb \- interruption response block
.SH "SYNOPSIS"
.sp
.nf
struct irb {
  union scsw scsw;
  union esw;
  __u8 ecw[32];
};  
.fi
.SH "MEMBERS"
.PP
scsw
.RS 4
subchannel status word
.RE
.PP
esw
.RS 4
extended status word
.RE
.PP
ecw[32]
.RS 4
extended control word
.RE
.SH "DESCRIPTION"
.PP
The irb that is handed to the device driver when an interrupt occurs\&. For solicited interrupts, the common I/O layer already performs checks whether a field is valid; a field not being valid is always passed as
\fB0\fR\&. If a unit check occurred,
\fIecw\fR
may contain sense data; this is retrieved by the common I/O layer itself if the device doesn\*(Aqt support concurrent sense (so that the device driver never needs to perform basic sene itself)\&. For unsolicited interrupts, the irb is passed as\-is (expect for sense data, if applicable)\&.
.SH "AUTHOR"
.PP
\fBCornelia Huck\fR <\&cornelia.huck@de.ibm.com\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br