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-<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 43. Portability</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="The Official Samba 3.5.x HOWTO and Reference Guide"><link rel="up" href="Appendix.html" title="Part VI. Reference Section"><link rel="prev" href="compiling.html" title="Chapter 42. How to Compile Samba"><link rel="next" href="Other-Clients.html" title="Chapter 44. Samba and Other CIFS Clients"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 43. Portability</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="compiling.html">Prev</a> </td><th width="60%" align="center">Part VI. Reference Section</th><td width="20%" align="right"> <a accesskey="n" href="Other-Clients.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 43. Portability"><div class="titlepage"><div><div><h2 class="title"><a name="Portability"></a>Chapter 43. Portability</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Jelmer</span> <span class="othername">R.</span> <span class="surname">Vernooij</span></h3><div class="affiliation"><span class="orgname">The Samba Team<br></span><div class="address"><p><code class="email">&lt;<a class="email" href="mailto:jelmer@samba.org">jelmer@samba.org</a>&gt;</code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="othername">H.</span> <span class="surname">Terpstra</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><code class="email">&lt;<a class="email" href="mailto:jht@samba.org">jht@samba.org</a>&gt;</code></p></div></div></div></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="Portability.html#id450764">HPUX</a></span></dt><dt><span class="sect1"><a href="Portability.html#id450860">SCO UNIX</a></span></dt><dt><span class="sect1"><a href="Portability.html#id450891">DNIX</a></span></dt><dt><span class="sect1"><a href="Portability.html#id451021">Red Hat Linux</a></span></dt><dt><span class="sect1"><a href="Portability.html#id451060">AIX: Sequential Read Ahead</a></span></dt><dt><span class="sect1"><a href="Portability.html#id451114">Solaris</a></span></dt><dd><dl><dt><span class="sect2"><a href="Portability.html#id451119">Locking Improvements</a></span></dt><dt><span class="sect2"><a href="Portability.html#winbind-solaris9">Winbind on Solaris 9</a></span></dt></dl></dd></dl></div><p>
-<a class="indexterm" name="id450749"></a>
-<a class="indexterm" name="id450755"></a>
-Samba works on a wide range of platforms, but the interface all the
-platforms provide is not always compatible. This chapter contains
-platform-specific information about compiling and using Samba.</p><div class="sect1" title="HPUX"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id450764"></a>HPUX</h2></div></div></div><p>
-<a class="indexterm" name="id450772"></a>
-<a class="indexterm" name="id450779"></a>
-Hewlett-Packard's implementation of supplementary groups is nonstandard (for
-historical reasons). There are two group files, <code class="filename">/etc/group</code> and
-<code class="filename">/etc/logingroup</code>; the system maps UIDs to numbers using the former, but
-initgroups() reads the latter. Most system admins who know the ropes
-symlink <code class="filename">/etc/group</code> to <code class="filename">/etc/logingroup</code>
-(hard-link does not work for reasons too obtuse to go into here). initgroups() will complain if one of the
-groups you're in, in <code class="filename">/etc/logingroup</code>, has what it considers to be an invalid
-ID, which means outside the range <code class="constant">[0..UID_MAX]</code>, where <code class="constant">UID_MAX</code> is
-60000 currently on HP-UX. This precludes -2 and 65534, the usual <code class="constant">nobody</code>
-GIDs.
-</p><p>
-If you encounter this problem, make sure the programs that are failing
-to initgroups() are run as users, not in any groups with GIDs outside the
-allowed range.
-</p><p>
-This is documented in the HP manual pages under setgroups(2) and passwd(4).
-</p><p>
-<a class="indexterm" name="id450843"></a>
-<a class="indexterm" name="id450849"></a>
-On HP-UX you must use gcc or the HP ANSI compiler. The free compiler
-that comes with HP-UX is not ANSI compliant and cannot compile Samba.
-</p></div><div class="sect1" title="SCO UNIX"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id450860"></a>SCO UNIX</h2></div></div></div><p>
-If you run an old version of SCO UNIX, you may need to get important
-TCP/IP patches for Samba to work correctly. Without the patch, you may
-encounter corrupt data transfers using Samba.
-</p><p>
-The patch you need is UOD385 Connection Drivers SLS. It is available from
-SCO <a class="ulink" href="ftp://ftp.sco.com/" target="_top">ftp.sco.com</a>, directory SLS,
-files uod385a.Z and uod385a.ltr.Z).
-</p><p>
-The information provided here refers to an old version of SCO UNIX. If you require
-binaries for more recent SCO UNIX products, please contact SCO to obtain packages that are
-ready to install. You should also verify with SCO that your platform is up to date for the
-binary packages you will install. This is important if you wish to avoid data corruption
-problems with your installation. To build Samba for SCO UNIX products may
-require significant patching of Samba source code. It is much easier to obtain binary
-packages directly from SCO.
-</p></div><div class="sect1" title="DNIX"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id450891"></a>DNIX</h2></div></div></div><p>
-DNIX has a problem with seteuid() and setegid(). These routines are
-needed for Samba to work correctly, but they were left out of the DNIX
-C library for some reason.
-</p><p>
-For this reason Samba by default defines the macro NO_EID in the DNIX
-section of includes.h. This works around the problem in a limited way,
-but it is far from ideal, and some things still will not work right.
-</p><p>
-To fix the problem properly, you need to assemble the following two
-functions and then either add them to your C library or link them into
-Samba. Put the following in the file <code class="filename">setegid.s</code>:
-</p><pre class="programlisting">
- .globl _setegid
-_setegid:
- moveq #47,d0
- movl #100,a0
- moveq #1,d1
- movl 4(sp),a1
- trap #9
- bccs 1$
- jmp cerror
-1$:
- clrl d0
- rts
-</pre><p>
-Put this in the file <code class="filename">seteuid.s</code>:
-</p><pre class="programlisting">
- .globl _seteuid
-_seteuid:
- moveq #47,d0
- movl #100,a0
- moveq #0,d1
- movl 4(sp),a1
- trap #9
- bccs 1$
- jmp cerror
-1$:
- clrl d0
- rts
-</pre><p>
-After creating the files, you then assemble them using
-</p><pre class="screen">
-<code class="prompt">$ </code><strong class="userinput"><code>as seteuid.s</code></strong>
-<code class="prompt">$ </code><strong class="userinput"><code>as setegid.s</code></strong>
-</pre><p>
-which should produce the files <code class="filename">seteuid.o</code> and
-<code class="filename">setegid.o</code>.
-</p><p>
-Next you need to add these to the LIBSM line in the DNIX section of
-the Samba Makefile. Your LIBSM line will look something like this:
-</p><pre class="programlisting">
-LIBSM = setegid.o seteuid.o -ln
-</pre><p>
-You should then remove the line:
-</p><pre class="programlisting">
-#define NO_EID
-</pre><p>from the DNIX section of <code class="filename">includes.h</code>.</p></div><div class="sect1" title="Red Hat Linux"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id451021"></a>Red Hat Linux</h2></div></div></div><p>
-By default during installation, some versions of Red Hat Linux add an
-entry to <code class="filename">/etc/hosts</code> as follows:
-</p><pre class="programlisting">
-127.0.0.1 loopback "hostname"."domainname"
-</pre><p>
-</p><p>
-<a class="indexterm" name="id451044"></a>
-This causes Samba to loop back onto the loopback interface.
-The result is that Samba fails to communicate correctly with
-the world and therefore may fail to correctly negotiate who
-is the master browse list holder and who is the master browser.
-</p><p>
-Corrective action: Delete the entry after the word "loopback"
-in the line starting 127.0.0.1.
-</p></div><div class="sect1" title="AIX: Sequential Read Ahead"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id451060"></a>AIX: Sequential Read Ahead</h2></div></div></div><p>
-Disabling sequential read ahead can improve Samba performance significantly
-when there is a relatively high level of multiprogramming (many smbd processes
-or mixed with another workload), not an abundance of physical memory or slower
-disk technology. These can cause AIX to have a higher WAIT values. Disabling
-sequential read-ahead can also have an adverse affect on other workloads in the
-system so you will need to evaluate other applications for impact.
-</p><p>
-It is recommended to use the defaults provided by IBM, but if you experience a
-high amount of wait time, try disabling read-ahead with the following commands:
-</p><p>
-For AIX 5.1 and earlier: <strong class="userinput"><code>vmtune -r 0</code></strong>
-</p><p>
-For AIX 5.2 and later jfs filesystems: <strong class="userinput"><code>ioo -o minpgahead=0</code></strong>
-</p><p>
-For AIX 5.2 and later jfs2 filesystems: <strong class="userinput"><code>ioo -o j2_minPageReadAhead=0</code></strong>
-</p><p>
-If you have a mix of jfs and jfs2 filesystems on the same host, simply use both
-ioo commands.
-</p></div><div class="sect1" title="Solaris"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id451114"></a>Solaris</h2></div></div></div><div class="sect2" title="Locking Improvements"><div class="titlepage"><div><div><h3 class="title"><a name="id451119"></a>Locking Improvements</h3></div></div></div><p>Some people have been experiencing problems with F_SETLKW64/fcntl
-when running Samba on Solaris. The built-in file-locking mechanism was
-not scalable. Performance would degrade to the point where processes would
-get into loops of trying to lock a file. It would try a lock, then fail,
-then try again. The lock attempt was failing before the grant was
-occurring. The visible manifestation of this was a handful of
-processes stealing all of the CPU, and when they were trussed, they would
-be stuck in F_SETLKW64 loops.
-</p><p>
-Please check with Sun support for current patches needed to fix this bug.
-The patch revision for 2.6 is 105181-34, for 8 is 108528-19, and for 9 is 112233-04.
-After the installation of these patches, it is recommended to reconfigure
-and rebuild Samba.
-</p><p>Thanks to Joe Meslovich for reporting this.</p></div><div class="sect2" title="Winbind on Solaris 9"><div class="titlepage"><div><div><h3 class="title"><a name="winbind-solaris9"></a>Winbind on Solaris 9</h3></div></div></div><p>
-Nsswitch on Solaris 9 refuses to use the Winbind NSS module. This behavior
-is fixed by Sun in patch <a class="ulink" href="http://sunsolve.sun.com/search/advsearch.do?collection=PATCH&amp;type=collections&amp;max=50&amp;language=en&amp;queryKey5=112960;rev=14&amp;toDocument=yes" target="_top">112960-14</a>.
-</p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="compiling.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="Appendix.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="Other-Clients.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 42. How to Compile Samba </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 44. Samba and Other CIFS Clients</td></tr></table></div></body></html>