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diff --git a/docs/docbook/projdoc/Portability.sgml b/docs/docbook/projdoc/Portability.sgml new file mode 100644 index 0000000000..72c3d20547 --- /dev/null +++ b/docs/docbook/projdoc/Portability.sgml @@ -0,0 +1,235 @@ +<chapter id="Portability"> +<chapterinfo> + &author.jelmer; +</chapterinfo> + +<title>Portability</title> + +<para>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.</para> + +<sect1> +<title>HPUX</title> + +<para> +HP's implementation of supplementary groups is, er, non-standard (for +hysterical reasons). There are two group files, /etc/group and +/etc/logingroup; the system maps UIDs to numbers using the former, but +initgroups() reads the latter. Most system admins who know the ropes +symlink /etc/group to /etc/logingroup (hard link doesn't work for reasons +too stupid to go into here). initgroups() will complain if one of the +groups you're in in /etc/logingroup has what it considers to be an invalid +ID, which means outside the range [0..UID_MAX], where UID_MAX is (I think) +60000 currently on HP-UX. This precludes -2 and 65534, the usual 'nobody' +GIDs. +</para> + +<para> +If you encounter this problem, make sure that the programs that are failing +to initgroups() be run as users not in any groups with GIDs outside the +allowed range. +</para> + +<para>This is documented in the HP manual pages under setgroups(2) and passwd(4). +</para> + +<para> +On HPUX 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. +</para> + +</sect1> + +<sect1> +<title>SCO Unix</title> + +<para> +If you run an old version of SCO Unix then 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. +</para> + +<para> +The patch you need is UOD385 Connection Drivers SLS. It is available from +SCO (ftp.sco.com, directory SLS, files uod385a.Z and uod385a.ltr.Z). +</para> + +</sect1> + +<sect1> +<title>DNIX</title> + +<para> +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. +</para> + +<para> +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, some things still won't work right. +</para> + +<para> +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. +</para> + +<para> +put this in the file <filename>setegid.s</filename>: +</para> + +<para><programlisting> + .globl _setegid +_setegid: + moveq #47,d0 + movl #100,a0 + moveq #1,d1 + movl 4(sp),a1 + trap #9 + bccs 1$ + jmp cerror +1$: + clrl d0 + rts +</programlisting></para> + +<para> +put this in the file <filename>seteuid.s</filename>: +</para> + +<para><programlisting> + .globl _seteuid +_seteuid: + moveq #47,d0 + movl #100,a0 + moveq #0,d1 + movl 4(sp),a1 + trap #9 + bccs 1$ + jmp cerror +1$: + clrl d0 + rts +</programlisting></para> + +<para> +after creating the above files you then assemble them using +</para> + +<para><command>as seteuid.s</command></para> +<para><command>as setegid.s</command></para> + +<para> +that should produce the files <filename>seteuid.o</filename> and +<filename>setegid.o</filename> +</para> + +<para> +then you need to add these to the LIBSM line in the DNIX section of +the Samba Makefile. Your LIBSM line will then look something like this: +</para> + +<para><programlisting> +LIBSM = setegid.o seteuid.o -ln +</programlisting></para> + +<para> +You should then remove the line: +</para> + +<para><programlisting> +#define NO_EID +</programlisting></para> + +<para>from the DNIX section of <filename>includes.h</filename></para> + +</sect1> + +<sect1> +<title>RedHat Linux Rembrandt-II</title> + +<para> +By default RedHat Rembrandt-II during installation adds an +entry to /etc/hosts as follows: +<programlisting> + 127.0.0.1 loopback "hostname"."domainname" +</programlisting> +</para> + +<para> +This causes Samba to loop back onto the loopback interface. +The result is that Samba fails to communicate correctly with +the world and therefor may fail to correctly negotiate who +is the master browse list holder and who is the master browser. +</para> + +<para> +Corrective Action: Delete the entry after the word loopback + in the line starting 127.0.0.1 +</para> +</sect1> + +<sect1> +<title>AIX</title> +<sect2> +<title>Sequential Read Ahead</title> +<!-- From an email by William Jojo <jojowil@hvcc.edu> --> +<para> +Disabling Sequential Read Ahead using <userinput>vmtune -r 0</userinput> improves +samba performance significally. +</para> +</sect2> +</sect1> + +<sect1> +<title>Solaris</title> + +<sect2> +<title>Locking improvements</title> + +<para>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 woul try a lock, then fail, +then try again. The lock attempt was failing before the grant was +occurring. So the visible manifestation of this would be a handful of +processes stealing all of the CPU, and when they were trussed they would +be stuck if F_SETLKW64 loops. +</para> + +<para> +Sun released patches for Solaris 2.6, 8, and 9. The patch for Solaris 7 +has not been released yet. +</para> + +<para> +The patch revision for 2.6 is 105181-34 +for 8 is 108528-19 +and for 9 is 112233-04 +</para> + +<para> +After the install of these patches it is recommended to reconfigure +and rebuild samba. +</para> + +<para>Thanks to Joe Meslovich for reporting</para> + +</sect2> + +<sect2 id="winbind-solaris9"> +<title>Winbind on Solaris 9</title> +<para> +Nsswitch on Solaris 9 refuses to use the winbind nss module. This behavior +is fixed by Sun in patch 113476-05 which as of March 2003 is not in any +roll-up packages. +</para> +</sect2> +</sect1> + +</chapter> |