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8269e7673c
Remove core system call implementations and documentation to lib/libsys and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>. Update paths to allow libc to find them in their new home. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
120 lines
3.0 KiB
Groff
120 lines
3.0 KiB
Groff
.\" Copyright (c) 2001 Chris Costello <chris@FreeBSD.org>
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.\" 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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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd October 17, 2016
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.Dt KLDSYM 2
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.Os
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.Sh NAME
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.Nm kldsym
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.Nd look up address by symbol name in a KLD
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/linker.h
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.Ft int
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.Fn kldsym "int fileid" "int cmd" "void *data"
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.Sh DESCRIPTION
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The
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.Fn kldsym
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system call returns the address of the symbol specified in
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.Fa data
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in the module specified by
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.Fa fileid .
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If
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.Fa fileid
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is 0, all loaded modules are searched.
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Currently, the only
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.Fa cmd
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implemented is
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.Dv KLDSYM_LOOKUP .
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.Pp
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The
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.Fa data
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argument is of the following structure:
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.Bd -literal -offset indent
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struct kld_sym_lookup {
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int version; /* sizeof(struct kld_sym_lookup) */
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char *symname; /* Symbol name we are looking up */
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u_long symvalue;
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size_t symsize;
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};
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.Ed
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.Pp
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The
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.Va version
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member is to be set
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by the code calling
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.Fn kldsym
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to
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.Fn sizeof "struct kld_sym_lookup" .
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The next two members,
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.Va version
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and
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.Va symname ,
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are specified by the user.
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The last two,
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.Va symvalue
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and
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.Va symsize ,
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are filled in by
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.Fn kldsym
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and contain the address associated with
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.Va symname
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and the size of the data it points to, respectively.
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.Sh RETURN VALUES
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.Rv -std kldsym
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.Sh ERRORS
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The
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.Fn kldsym
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system call will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Invalid value in
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.Fa data->version
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or
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.Fa cmd .
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.It Bq Er ENOENT
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The
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.Fa fileid
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argument
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is invalid,
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or the specified symbol could not be found.
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.El
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.Sh SEE ALSO
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.Xr kldfind 2 ,
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.Xr kldfirstmod 2 ,
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.Xr kldload 2 ,
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.Xr kldnext 2 ,
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.Xr kldunload 2 ,
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.Xr modfind 2 ,
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.Xr modnext 2 ,
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.Xr modstat 2 ,
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.Xr kld 4
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.Sh HISTORY
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The
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.Fn kldsym
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system call first appeared in
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.Fx 3.0 .
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