'\" te
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.TH DI_WALK_MINOR 3DEVINFO "Jan 14, 2009"
.SH NAME
di_walk_minor \- traverse libdevinfo minor nodes
.SH SYNOPSIS
.nf
\fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-ldevinfo\fR [ \fIlibrary\fR... ]
#include <libdevinfo.h>

\fBint\fR \fBdi_walk_minor\fR(\fBdi_node_t\fR \fIroot\fR, \fBconst char *\fR\fIminor_nodetype\fR,
     \fBuint_t\fR \fIflag\fR, \fBvoid *\fR\fIarg\fR, \fBint\fR (\fI*minor_callback\fR)(di_node_t \fInode\fR,
     di_minor_t \fIminor\fR, void *\fIarg\fR));
.fi

.SH PARAMETERS
.ne 2
.na
\fB\fIarg\fR\fR
.ad
.RS 18n
Pointer to caller- specific user data.
.RE

.sp
.ne 2
.na
\fB\fIflag\fR\fR
.ad
.RS 18n
Specify 0. Reserved for future use.
.RE

.sp
.ne 2
.na
\fB\fIminor\fR\fR
.ad
.RS 18n
The minor node visited.
.RE

.sp
.ne 2
.na
\fB\fIminor_nodetype\fR\fR
.ad
.RS 18n
A character string specifying the minor data type, which may be one of the
types defined by the illumos DDI framework, for example, \fBDDI_NT_BLOCK\fR.
\fBNULL\fR matches all \fIminor_node\fR  types. See
\fBddi_create_minor_node\fR(9F).
.RE

.sp
.ne 2
.na
\fB\fInode\fR\fR
.ad
.RS 18n
The device node with which to  the minor node is associated.
.RE

.sp
.ne 2
.na
\fB\fIroot\fR\fR
.ad
.RS 18n
Root of subtree to visit.
.RE

.SH DESCRIPTION
The \fBdi_walk_minor()\fR function visits all minor nodes attached to device
nodes in a subtree rooted at \fIroot\fR. For each  minor node that matches
\fIminor_nodetype\fR, the caller-supplied function \fIminor_callback\fR() is
invoked. The walk terminates immediately when \fIminor_callback\fR() returns
\fBDI_WALK_TERMINATE\fR.
.SH RETURN VALUES
Upon successful completion, \fBdi_walk_minor()\fR returns 0. Otherwise, -1 is
returned and errno is set to indicate the error.
.sp
.LP
The \fBminor_callback()\fR function returns one of the following:
.sp
.ne 2
.na
\fB\fBDI_WALK_CONTINUE\fR\fR
.ad
.RS 21n
Continue to visit subsequent minor data nodes.
.RE

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

.SH ERRORS
The \fBdi_walk_minor()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
Invalid argument.
.RE

.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
MT-Level	Safe
.TE

.SH SEE ALSO
\fBdladm\fR(8), \fBdi_minor_nodetype\fR(3DEVINFO), dlpi_walk(3DLPI),
.BR libdevinfo (3LIB),
.BR attributes (7),
.BR filesystem (7),
.BR ddi_create_minor_node (9F)
.sp
.LP
\fIWriting Device Drivers\fR
.SH NOTES
The \fBdi_walk_minor()\fR function is no longer an accurate method for walking
network datalink interfaces on the system. Applications should use
\fBdlpi_walk\fR(3DLPI) instead. It has been common for applications to use
\fBdi_walk_minor()\fR to walk networking devices by passing in a
\fBminor_nodetype\fR of \fBDDI_NT_NET\fR, in most cases to discover the set of
DLPI devices on the system. illumos now makes a layering distinction between
networking devices (the objects displayed in the \fBDEVICE\fR field by
\fBdladm\fR \fBshow-phys\fR) and network datalink interfaces (the objects
displayed by \fBdladm\fR \fBshow-link\fR). Datalink interfaces are represented
as the set of DLPI device nodes that applications can open by using
\fBdlpi_open\fR(3DLPI) or by opening DLPI nodes out of the \fB/dev/net\fR
filesystem (see \fBfilesystem\fR(7)). The \fBdlpi_walk\fR(3DLPI) function is
the proper function to walk these nodes.