freebsd-dev/lib/libc/sys/kldsym.2

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.\" Copyright (c) 2001 Chris Costello <chris@FreeBSD.org>
.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" $FreeBSD$
.\"
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.Dd July 26, 2001
.Dt KLDSYM 2
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.Os
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.Sh NAME
.Nm kldsym
.Nd look up address by symbol name in a KLD
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
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.In sys/param.h
.In sys/linker.h
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.Ft int
.Fn kldsym "int fileid" "int command" "void *data"
.Sh DESCRIPTION
The
.Fn kldsym
function returns the address of the symbol specified in
.Fa data
in the module specified by
.Fa fileid .
If
.Fa fileid
is 0, all loaded modules are searched.
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Currently, the only
.Fa command
implemented is
.Dv KLDSYM_LOOKUP .
.Pp
The
.Fa data
argument is of the following structure:
.Pp
.Bd -literal -offset indent
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;
};
.Ed
.Pp
The
.Va version
member is to be set
by the code calling
.Fn kldsym
to
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.Fn sizeof "struct kld_sym_lookup" .
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The next two members,
.Va version
and
.Va symname ,
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are specified by the user.
The last two,
.Va symvalue
and
.Va symsize ,
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are filled in by
.Fn kldsym
and contain the address associated with
.Va symname
and the size of the data it points to, respectively.
.Sh RETURN VALUES
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.Rv -std kldsym
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.Sh ERRORS
The
.Fn kldsym
function will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
Invalid value in
.Fa data->version
or
.Fa command .
.It Bq Er ENOENT
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.Fa fileid
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is invalid,
or the specified symbol could not be found.
.El
.Sh SEE ALSO
.Xr kldfind 2 ,
.Xr kldfirstmod 2 ,
.Xr kldload 2 ,
.Xr kldnext 2 ,
.Xr kldunload 2 ,
.Xr modfind 2 ,
.Xr modnext 2 ,
.Xr modstat 2 ,
.Xr kld 4
.Sh HISTORY
The
.Fn kldsym
function first appeared in
.Fx 3.0 .