'\" te
.\"  Copyright 1989 AT&T  Copyright (c) 2006,
.\" Sun Microsystems, Inc.
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.TH esbbcall 9F "16 Jan 2006" "SunOS 5.11" "Kernel Functions for Drivers"
.SH NAME
esbbcall \- call function when buffer is available
.SH SYNOPSIS
.LP
.nf
#include <sys/stream.h> 



\fBbufcall_id_t\fR \fBesbbcall\fR(\fBuint_t\fR \fIpri\fR, \fBvoid\fR (\fI*func\fR)(\fIvoid *arg\fR), 
     \fBvoid\fR(\fIarg\fR));
.fi

.SH INTERFACE LEVEL
.sp
.LP
Architecture independent level 1 (DDI/DKI).
.SH PARAMETERS
.sp
.ne 2
.mk
.na
\fB\fIpri\fR\fR
.ad
.RS 8n
.rt  
Priority of allocation request (to be used by \fBallocb\fR(9F) function, called
by \fBesbbcall()\fR).
.RE

.sp
.ne 2
.mk
.na
\fB\fIfunc\fR\fR
.ad
.RS 8n
.rt  
Function to be called when buffer becomes available.
.RE

.sp
.ne 2
.mk
.na
\fB\fIarg\fR\fR
.ad
.RS 8n
.rt  
Argument to \fIfunc\fR.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBesbbcall()\fR function, like \fBbufcall\fR(9F), serves as a
\fBtimeout\fR(9F) call of indeterminate length. If \fBesballoc\fR(9F) is unable
to allocate a message and data block header to go with its externally supplied
data buffer, \fBesbbcall()\fR can be used to schedule the routine \fIfunc\fR,
to be called with the argument \fIarg\fR when a buffer becomes available. The
\fIfunc\fR argument can be a routine that calls \fBesballoc\fR(9F) or it may be
another kernel function.
.SH RETURN VALUES
.sp
.LP
On success, a \fBbufcall\fR \fBID\fRis returned. On failure, \fB0\fR is
returned. The value returned from a successful call should be saved for
possible future use with \fBunbufcall()\fR should it become necessary to cancel
the \fBesbbcall()\fR request (as at driver close time).
.SH CONTEXT
.sp
.LP
The \fBesbbcall()\fR function can be called from user, interrupt, or kernel
context.
.SH SEE ALSO
.sp
.LP
\fBallocb\fR(9F), \fBbufcall\fR(9F), \fBesballoc\fR(9F), \fBtimeout\fR(9F),
\fBdatab\fR(9S), \fBunbufcall\fR(9F)
.sp
.LP
\fIWriting Device Drivers\fR \fISTREAMS Programming Guide\fR