postfix-master/ULTRIX_README.html

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   8 <title>Postfix and Ultrix </title>
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  16 <h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix and Ultrix </h1>
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  20 <h2> Postfix on Ultrix </h2>
  21
  22 <p> This document is probably only of historical value, because
  23 Ultrix version 4 dates from the early 1990s. However, as long as
  24 Wietse keeps Postfix alive for SunOS 4, it is likely to run on
  25 Ultrix 4 with very little change. Feedback is welcome if anyone
  26 actually still uses Postfix on any version of Ultrix. </p>
  27
  28 <p> The source of this document is an email message by Christian von Roques
  29 that was sent on Jun 2, 1999. </p>
  30
  31 <blockquote>
  32
  33 <p> I've upgraded the MTA of our DECstation-3100 running Ultrix4.3a to
  34 postfix-19990317-pl05 and am sending you the patches I needed to get
  35 it running under Ultrix. </p>
  36
  37 <p> . . . </p>
  38
  39 <p> One of the bugs of Ultrix's /bin/sh is that shell-variables
  40 set in arguments of `:' expand to garbage if expanded in here-documents.
  41 Using a different shell helps.  I needed to replace all calls of
  42 ``sh .../makedefs'' by ``$(SHELL) .../makedefs'' in all the
  43 Makefile.in and am now able to use ``make SHELL=/bin/sh5'' or zsh.
  44
  45 <p> . . . </p>
  46
  47 <p> Ultrix's FD_SET_SIZE is 4096, but getdtablesize()
  48 returns 64 by default, if not increased when building a new
  49 kernel.  getrlimit() doesn't know RLIMIT_NOFILE.  This makes
  50 event_init() always log the warning: `could allocate space for
  51 only 64 open files'. </p>
  52
  53 <p> I just reduced the threshold from 256 to 64, but this is not good.
  54 The initial problem still remains: How to disable this warning on
  55 Ultrix without making the source ugly?   </p>
  56
  57 </blockquote>
  58
  59 <p> To work around the first problem, all the Makefile.in files
  60 have been updated to use `$(SHELL)' instead of `sh'. So you only
  61 need to supply a non-default shell in order to eliminate Ultrix
  62 shell trouble.  </p>
  63
  64 <p> To work around the latter, util/sys_defs.h was updated for
  65 Ultrix, with a default FD_SETSIZE of 100.  This should be sufficient
  66 for a workstation. Even in 1999, no-one would run a major mail hub
  67 on Ultrix 4. </p>
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