1.\" Copyright (c) 2001 Chris Costello <chris@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd October 17, 2016 26.Dt KLDSYM 2 27.Os 28.Sh NAME 29.Nm kldsym 30.Nd look up address by symbol name in a KLD 31.Sh LIBRARY 32.Lb libc 33.Sh SYNOPSIS 34.In sys/linker.h 35.Ft int 36.Fn kldsym "int fileid" "int cmd" "void *data" 37.Sh DESCRIPTION 38The 39.Fn kldsym 40system call returns the address of the symbol specified in 41.Fa data 42in the module specified by 43.Fa fileid . 44If 45.Fa fileid 46is 0, all loaded modules are searched. 47Currently, the only 48.Fa cmd 49implemented is 50.Dv KLDSYM_LOOKUP . 51.Pp 52The 53.Fa data 54argument is of the following structure: 55.Bd -literal -offset indent 56struct kld_sym_lookup { 57 int version; /* sizeof(struct kld_sym_lookup) */ 58 char *symname; /* Symbol name we are looking up */ 59 u_long symvalue; 60 size_t symsize; 61}; 62.Ed 63.Pp 64The 65.Va version 66member is to be set 67by the code calling 68.Fn kldsym 69to 70.Fn sizeof "struct kld_sym_lookup" . 71The next two members, 72.Va version 73and 74.Va symname , 75are specified by the user. 76The last two, 77.Va symvalue 78and 79.Va symsize , 80are filled in by 81.Fn kldsym 82and contain the address associated with 83.Va symname 84and the size of the data it points to, respectively. 85.Sh RETURN VALUES 86.Rv -std kldsym 87.Sh ERRORS 88The 89.Fn kldsym 90system call will fail if: 91.Bl -tag -width Er 92.It Bq Er EINVAL 93Invalid value in 94.Fa data->version 95or 96.Fa cmd . 97.It Bq Er ENOENT 98The 99.Fa fileid 100argument 101is invalid, 102or the specified symbol could not be found. 103.El 104.Sh SEE ALSO 105.Xr kldfind 2 , 106.Xr kldfirstmod 2 , 107.Xr kldload 2 , 108.Xr kldnext 2 , 109.Xr kldunload 2 , 110.Xr modfind 2 , 111.Xr modnext 2 , 112.Xr modstat 2 , 113.Xr kld 4 114.Sh HISTORY 115The 116.Fn kldsym 117system call first appeared in 118.Fx 3.0 . 119