'\" te
.\" Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
.TH di_devlink_walk  3DEVINFO "15 May 2008" "SunOS 5.11" "Device Information Library Functions"
.SH NAME
di_devlink_walk \- walk through links in a devlink snapshot
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-ldevinfo\fR [ \fIlibrary\fR... ]
#include <libdevinfo.h>

\fBint\fR \fBdi_devlink_walk\fR(\fBdi_devlink_handle_t\fR \fIhdl\fR, \fBconst char *\fR\fIre\fR,
     \fBconst char *\fR\fImpath\fR, \fBuint_t\fR \fIflags\fR, \fBvoid *\fR\fIarg\fR,
     \fBint\fR (*\fIdevlink_callback\fR)(\fBdi_devlink_t\fR \fIdevlink\fR, \fBvoid *\fR\fIarg\fR));
.fi

.SH PARAMETERS
.sp
.ne 2
.mk
.na
\fB\fIhdl\fR\fR
.ad
.RS 11n
.rt  
A handle to a snapshot of devlinks in "\fB/dev\fR".
.RE

.sp
.ne 2
.mk
.na
\fB\fIre\fR\fR
.ad
.RS 11n
.rt  
An extended regular expression as specified in \fBregex\fR(5) describing the paths of devlinks to visit. A null value matches all devlinks. The expression should not involve the "\fB/dev\fR" prefix. For example, the "^\fBdsk/\fR" will invoke \fIdevlink_callback\fR() for all "\fB/dev/dsk/\fR" links.
.RE

.sp
.ne 2
.mk
.na
\fB\fImpath\fR\fR
.ad
.RS 11n
.rt  
A path to a minor node below "\fB/devices\fR" for which "\fB/dev\fR" links are to be looked up. A null value selects all devlinks.  This path should not have a "\fB/devices\fR" prefix.
.RE

.sp
.ne 2
.mk
.na
\fB\fIarg\fR\fR
.ad
.RS 11n
.rt  
A pointer to caller private data.
.RE

.sp
.ne 2
.mk
.na
\fB\fIdevlink\fR\fR
.ad
.RS 11n
.rt  
The devlink being visited.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBdi_devlink_walk()\fR function visits every link in the snapshot that meets the criteria specified by the caller. For each such devlink, the caller-supplied function \fIdevlink_callback\fR() is invoked. The return value of 	\fIdevlink_callback\fR() determines subsequent walk behavior.
.SH RETURN VALUES
.sp
.LP
Upon success, the \fBdi_devlink_walk()\fR function returns 0. Otherwise, -1 is returned and \fBerrno\fR is set to indicate the error.
.sp
.LP
The \fIdevlink_callback\fR() function can return the following values:
.sp
.ne 2
.mk
.na
\fB\fBDI_WALK_CONTINUE\fR\fR
.ad
.RS 21n
.rt  
Continue walking.
.RE

.sp
.ne 2
.mk
.na
\fB\fBDI_WALK_TERMINATE\fR\fR
.ad
.RS 21n
.rt  
Terminate the walk immediately.
.RE

.SH ERRORS
.sp
.LP
The \fBdevlink_callback()\fR function will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
.rt  
One or more arguments is invalid.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENOMEM\fR\fR
.ad
.RS 10n
.rt  
Insufficient memory is available.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5)  for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
_
MT-LevelSafe
.TE

.SH SEE ALSO
.sp
.LP
\fBdi_devlink_init\fR(3DEVINFO), \fBdi_devlink_path\fR(3DEVINFO), \fBlibdevinfo\fR(3LIB), \fBmalloc\fR(3C), \fBattributes\fR(5), \fBregex\fR(5)