nlist(3)nlist(3)NAMEnlist - gets entries from name list
SYNOPSIS
#include <nlist.h>
nlist(
char *filename,
struct nlist [nl] );
cc ... -lmld
DESCRIPTION
NOTE
The nlist() subroutine has moved from the standard C library to the
libmld.a library due to the difference in the object file format. Pro‐
grams that need to use nlist() must be linked with the -lmld flag.
The nlist() subroutine 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.
For BSD compatibility, the nlist() subroutine allows symbol names to be
preceded by an underscore. If it does not find a symbol that matches
the name as specified, nlist() attempts to locate the symbol name with
the leading underscore removed.
For the structure declaration, see /usr/include/nlist.h.
To obtain up-to-date system addresses from the system name list kept in
the file /vmunix, use the knlist() subroutine. Alternatively, use the
getsysinfo() function to obtain the name of the file from which the
kernel was booted, prepend a slash character (/) to this name, and sup‐
ply the prepended name to the nlist() subroutine. Do not specify /vmu‐
nix as the filename to the nlist() subroutine because it may cause
nlist() to return invalid symbol addresses.
ERRORS
If the file cannot be found or if it is not a valid namelist, -1 is
returned; otherwise, the number of unfound namelist entries is
returned.
The type entry is set to 0 if the symbol is not found.
SEE ALSOgetsysinfo(2), knlist(3), a.out(4)nlist(3)
