freebsd-dev/lib/libkvm/kvm_nlist.3
Warner Losh fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

119 lines
3.6 KiB
Groff

.\" Copyright (c) 1992, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software developed by the Computer Systems
.\" Engineering group at Lawrence Berkeley Laboratory under DARPA contract
.\" BG 91-66 and contributed to Berkeley.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)kvm_nlist.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd November 27, 2015
.Dt KVM_NLIST 3
.Os
.Sh NAME
.Nm kvm_nlist ,
.Nm kvm_nlist2
.Nd retrieve symbol table names from a kernel image
.Sh LIBRARY
.Lb libkvm
.Sh SYNOPSIS
.In kvm.h
.In nlist.h
.Ft int
.Fn kvm_nlist "kvm_t *kd" "struct nlist *nl"
.Ft int
.Fn kvm_nlist2 "kvm_t *kd" "struct kvm_nlist *nl"
.Sh DESCRIPTION
The
.Fn kvm_nlist
function retrieves the symbol table entries indicated by the name list argument
.Fa \&nl .
This argument points to an array of nlist structures, terminated by
an entry whose
.Fa n_name
field is
.Dv NULL
(see
.Xr nlist 3 ) .
Each symbol is looked up using the
.Fa n_name
field, and if found, the
corresponding
.Fa n_type
and
.Fa n_value
fields are filled in.
These fields are set
to 0 if the symbol is not found.
.Pp
The
.Xr kldsym 2
system call is used to locate symbols in live kernels.
This is a less than perfect
emulation of the nlist values but has the advantage of being aware of kernel
modules and is reasonably fast.
.Pp
The
.Fn kvm_nlist2
function retrieves the symbol table entries indicated by the name list argument
.Fa nl .
This argument points to an array of
.Vt "struct kvm_nlist"
structures,
terminated by an entry whose
.Fa n_name
field is
.Dv NULL
These structures are similar to the nlist structures used by
.Fn kvm_nlist
except that the
.Fa n_value
field uses a different type
.Pq Vt kvaddr_t
to avoid truncation when examining non-native kernel images.
.Sh RETURN VALUES
The
.Fn kvm_nlist
and
.Fn kvm_nlist2
functions return the number of invalid entries found.
If the kernel symbol table was unreadable, -1 is returned.
.Sh SEE ALSO
.Xr kldsym 2 ,
.Xr kvm 3 ,
.Xr kvm_close 3 ,
.Xr kvm_getargv 3 ,
.Xr kvm_getenvv 3 ,
.Xr kvm_geterr 3 ,
.Xr kvm_getprocs 3 ,
.Xr kvm_native 3 ,
.Xr kvm_open 3 ,
.Xr kvm_openfiles 3 ,
.Xr kvm_read 3 ,
.Xr kvm_write 3