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.\" $OpenBSD: nlist.3,v 1.10 2007/05/31 19:19:28 jmc Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 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
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.\" 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)
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.\"
.Dd $Mdocdate: May 31 2007 $
.Dt NLIST 3
.Os
.Sh NAME
.Nm nlist
.Nd retrieve symbol table name list from an executable file
.Sh SYNOPSIS
.Fd #include <nlist.h>
.Ft int
.Fn nlist "const char *filename" "struct nlist *nl"
.Sh DESCRIPTION
The
.Fn nlist
function retrieves name list entries from the symbol table of an
executable file.
(See
.Xr a.out 5 . )
The argument
.Fa \&nl
is set to reference the
beginning of the list.
The list is preened of binary and invalid data;
if an entry in the
name list is valid, the
.Fa n_type
and
.Fa n_value
for the entry are copied into the list
referenced by
.Fa \&nl .
No other data is copied.
The last entry in the list always has its
.Fa n_name
field set to
.Dv NULL .
.Sh RETURN VALUES
The number of invalid entries is returned if successful; otherwise,
if the file
.Fa filename
does not exist or is not an executable, the returned value is \-1.
.Sh SEE ALSO
.Xr a.out 5
.Sh HISTORY
A
.Fn nlist
function appeared in
.At v6 .
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