NLIST(3ELF) ELF Library Functions NLIST(3ELF)
NAME
nlist - get entries from name list
SYNOPSIS
cc [
flag... ]
file ...
-lelf [
library ... ]
#include <nlist.h>
int nlist(
const char *filename,
struct nlist *nl);
DESCRIPTION
nlist() examines the name list in the executable file whose name is
pointed to by
filename, and selectively extracts a list of values and
puts them in the array of
nlist() structures pointed to by
nl. The
name list
nl consists of an array of structures containing names of
variables, types, and values. The list is terminated with a null
name, that is, a null string is in the name position of the
structure. Each variable name is looked up in the name list of the
file. If the name is found, the type, value, storage class, and
section number of the name are inserted in the other fields. The
type field may be set to 0 if the file was not compiled with the
-g option to
cc.
nlist() will always return the information for an external symbol of
a given name if the name exists in the file. If an external symbol
does not exist, and there is more than one symbol with the specified
name in the file (such as static symbols defined in separate files),
the values returned will be for the last occurrence of that name in
the file. If the name is not found, all fields in the structure
except
n_name are set to 0.
This function is useful for examining the system name list kept in
the file
/dev/ksyms. In this way programs can obtain system addresses
that are up to date.
RETURN VALUES
All value entries are set to 0 if the file cannot be read or if it
does not contain a valid name list.
nlist() returns 0 on success, -1 on error.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Stable |
+--------------------+-----------------+
|MT-Level | Safe |
+--------------------+-----------------+
SEE ALSO
elf(3ELF),
kvm_nlist(3KVM),
kvm_open(3KVM),
libelf(3LIB),
ksyms(4D),
mem(4D),
a.out(5),
attributes(7) July 11, 2001 NLIST(3ELF)
