.TH NLIST 3 
.UC
.SH NAME
nlist \- get entries from name list
.SH SYNOPSIS
.B #include <a.out.h>
.sp
.B nlist(filename, nl)
.br
.B char *filename;
.DT
.nf
.ft 3
struct nlist nl[ ];
.fi
.SH DESCRIPTION
.I Nlist
examines the name list in
the given executable output file
and selectively extracts a
list of values.
The name list consists of
an array of structures containing names,
types and values.
The list is terminated with a null name.
Each name is looked up in the name list of
the file.
If the name is found, the type and value of the
name are inserted in the next two fields.
If the name is not found, both entries are set to 0.
See
.IR a.out (5)
for the structure declaration.
.PP
This subroutine is useful for
examining the system name list kept in
the file
.IR /unix .
In this way programs can obtain system addresses
that are up to date.
.SH "SEE ALSO"
a.out(5)
.SH DIAGNOSTICS
All
type entries are set to 0 if the file cannot be found
or if it does not have a valid name list.
.PP
\fINlist\fP returns \-1 if \fIfilename\fP cannot be opened or has a bad
magic number.
It returns 1 if
.I filename
has no name list.