1.\" $NetBSD: compat_30.8,v 1.5 2006/09/02 23:44:38 wiz Exp $ 2.\" 3.\" Copyright (c) 2006 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from a document contributed to The NetBSD Foundation 7.\" by Chapman Flack. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.Dd August 26, 2006 38.Dt COMPAT_30 8 39.Os 40.Sh NAME 41.Nm compat_30 42.Nd setup procedure for backward compatibility on post-3.0 release 43.Sh SYNOPSIS 44.Cd "options COMPAT_30" 45.Sh DESCRIPTION 46The 47.Nm 48module allows 49.Nx 50to run 51.Nx 3.0 52executables. 53.Pp 54The support is present if the kernel was built with option 55.Dv COMPAT_30 . 56It is not available as a loadable module. 57.Pp 58Static executables typically need no additional setup. 59Dynamic binaries may require shared libraries whose major version 60number changed since 61.Nx 3.0 , 62which are listed below. 63A shadow directory under 64.Pa /emul 65is not used; the libraries can be obtained from a 66.Nx 3.0 67distribution and installed in the original directories shown, 68as the major version number in the file name will prevent conflicts. 69If an upgrade installation from 70.Nx 3.0 71has been done and these libraries are still present, nothing more need 72be done. 73.Ss Libraries needed from 3.0 74.Bl -item 75.It 76.Pa /lib/libcrypto.so.2.1 77.Pa /lib/libcrypto.so.2 78.It 79.Pa /lib/libevent.so.0.2 80.Pa /lib/libevent.so.0 81.It 82.Pa /usr/lib/libkafs.so.6.0 83.Pa /usr/lib/libkafs.so.6 84.It 85.Pa /usr/lib/libkrb5.so.19.1 86.Pa /usr/lib/libkrb5.so.19 87.It 88.Pa /lib/libradius.so.0.0 89.Pa /lib/libradius.so.0 90.It 91.Pa /usr/lib/libssh.so.1.0 92.Pa /usr/lib/libssh.so.1 93.It 94.Pa /usr/lib/libssl.so.3.0 95.Pa /usr/lib/libssl.so.3 96.\" .It 97.\" .Pa libtelnet lives where? 98.It 99.Pa /lib/libz.so.0.4 100.Pa /lib/libz.so.0 101.It 102.Pa /usr/lib/libamu.so.2.1 103.Pa /usr/lib/libamu.so.2 104.El 105.Sh IMPLEMENTATION NOTES 106.Dv COMPAT_30 107enables the 108.Nx 3.0 109versions of the following system calls, whose syscall numbers and 110argument structures were changed after the 3.0 release to accommodate 11164-bit filesystems: 112.Xr fhstat 2 , 113.Xr fstat 2 , 114.Xr getdents 2 , 115.Xr lstat 2 , 116.Xr stat 2 . 117.Pp 118The filehandle structure (formerly 119.Vt fhandle_t ) 120was made opaque to userland and variable-sized. 121A 122.Fa fh_size 123argument was added to related syscalls: 124.Xr fhstat 2 , 125.Xr fhstatvfs 2 , 126.Xr fhstatvfs1 2 , 127.Xr fhopen 2 , 128.Xr getfh 2 . 129This changes the API and ABI of those syscalls, 130.Dv COMPAT_30 131enables binary compatibility with the old ABI. 132Source compatibility is not provided, as use of those syscalls is 133supposed to be rare. 134.Pp 135The 136.Vt struct ntptimeval 137used by 138.Xr ntp_gettime 2 139changed with the implementation of timecounters. 140.Sh SEE ALSO 141.Xr config 1 , 142.Xr fhstat 2 , 143.Xr fstat 2 , 144.Xr getdents 2 , 145.Xr lstat 2 , 146.Xr stat 2 , 147.Xr options 4 148.Sh HISTORY 149.Nx 150offers back-compatibility options back to 151.Nx 0.9 , 152but the first to be documented with a manual page is 153.Nm . 154.Sh BUGS 155The compatible 156.Xr getdents 2 157is unable to see directory entries beneath the top layer of a union, 158even though the real 3.0 159.Fn getdents 160did not have that problem. 161.Sh SECURITY CONSIDERATIONS 162Programs with security impact that receive incorrect directory contents 163from 164.Fn getdents 165may behave improperly, as when they are unable to find, or find the wrong 166versions of, important files. 167