kldsym(2)

NAME

kldsym - look up address by symbol name in a KLD

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/param.h>
#include <sys/linker.h>
int
kldsym(int fileid, int command, void *data);

DESCRIPTION

The kldsym() system call returns the address of the symbol

specified in
data in the module specified by fileid. If fileid is 0, all

loaded modules are searched. Currently, the only command implemented

is
KLDSYM_LOOKUP.

The data argument is of the following structure:

struct kld_sym_lookup {

int version; /* sizeof(struct

kld_sym_lookup) */
char *symname; /* Symbol name we are

looking up */
u_long symvalue;
size_t symsize;

};

The version member is to be set by the code calling kldsym()

to
sizeof(struct kld_sym_lookup). The next two members,

version and
symname, are specified by the user. The last two, symvalue

and symsize,
are filled in by kldsym() and contain the address associated

with symname
and the size of the data it points to, respectively.

RETURN VALUES

The kldsym() function returns the value 0 if successful;

otherwise the
value -1 is returned and the global variable errno is set to

indicate the
error.

ERRORS

The kldsym() system call will fail if:

[EINVAL] Invalid value in data->version or

command.

[ENOENT] The fileid argument is invalid, or the

specified sym

bol could not be found.

SEE ALSO

kldfind(2), kldfirstmod(2), kldload(2), kldnext(2), kldun

load(2),
modfind(2), modnext(2), modstat(2), kld(4)

HISTORY

The kldsym() system call first appeared in FreeBSD 3.0.

BSD July 26, 2001

BSD