1.\" Copyright (c) 2001 Chris Costello <[email protected]> 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.\" $FreeBSD$ 26.\" 27.Dd October 17, 2016 28.Dt KLDSYM 2 29.Os 30.Sh NAME 31.Nm kldsym 32.Nd look up address by symbol name in a KLD 33.Sh LIBRARY 34.Lb libc 35.Sh SYNOPSIS 36.In sys/param.h 37.In sys/linker.h 38.Ft int 39.Fn kldsym "int fileid" "int cmd" "void *data" 40.Sh DESCRIPTION 41The 42.Fn kldsym 43system call returns the address of the symbol specified in 44.Fa data 45in the module specified by 46.Fa fileid . 47If 48.Fa fileid 49is 0, all loaded modules are searched. 50Currently, the only 51.Fa cmd 52implemented is 53.Dv KLDSYM_LOOKUP . 54.Pp 55The 56.Fa data 57argument is of the following structure: 58.Bd -literal -offset indent 59struct kld_sym_lookup { 60 int version; /* sizeof(struct kld_sym_lookup) */ 61 char *symname; /* Symbol name we are looking up */ 62 u_long symvalue; 63 size_t symsize; 64}; 65.Ed 66.Pp 67The 68.Va version 69member is to be set 70by the code calling 71.Fn kldsym 72to 73.Fn sizeof "struct kld_sym_lookup" . 74The next two members, 75.Va version 76and 77.Va symname , 78are specified by the user. 79The last two, 80.Va symvalue 81and 82.Va symsize , 83are filled in by 84.Fn kldsym 85and contain the address associated with 86.Va symname 87and the size of the data it points to, respectively. 88.Sh RETURN VALUES 89.Rv -std kldsym 90.Sh ERRORS 91The 92.Fn kldsym 93system call will fail if: 94.Bl -tag -width Er 95.It Bq Er EINVAL 96Invalid value in 97.Fa data->version 98or 99.Fa cmd . 100.It Bq Er ENOENT 101The 102.Fa fileid 103argument 104is invalid, 105or the specified symbol could not be found. 106.El 107.Sh SEE ALSO 108.Xr kldfind 2 , 109.Xr kldfirstmod 2 , 110.Xr kldload 2 , 111.Xr kldnext 2 , 112.Xr kldunload 2 , 113.Xr modfind 2 , 114.Xr modnext 2 , 115.Xr modstat 2 , 116.Xr kld 4 117.Sh HISTORY 118The 119.Fn kldsym 120system call first appeared in 121.Fx 3.0 . 122