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diff --git a/README_FILES/ULTRIX_README b/README_FILES/ULTRIX_README new file mode 100644 index 0000000..98078d1 --- /dev/null +++ b/README_FILES/ULTRIX_README @@ -0,0 +1,45 @@ +PPoossttffiixx aanndd UUllttrriixx + +------------------------------------------------------------------------------- + +PPoossttffiixx oonn UUllttrriixx + +This document is probably only of historical value, because Ultrix version 4 +dates from the early 1990s. However, as long as Wietse keeps Postfix alive for +SunOS 4, it is likely to run on Ultrix 4 with very little change. Feedback is +welcome if anyone actually still uses Postfix on any version of Ultrix. + +The source of this document is an email message by Christian von Roques that +was sent on Jun 2, 1999. + + I've upgraded the MTA of our DECstation-3100 running Ultrix4.3a to postfix- + 19990317-pl05 and am sending you the patches I needed to get it running + under Ultrix. + + . . . + + One of the bugs of Ultrix's /bin/sh is that shell-variables set in + arguments of `:' expand to garbage if expanded in here-documents. Using a + different shell helps. I needed to replace all calls of ``sh .../makedefs'' + by ``$(SHELL) .../makedefs'' in all the Makefile.in and am now able to use + ``make SHELL=/bin/sh5'' or zsh. + + . . . + + Ultrix's FD_SET_SIZE is 4096, but getdtablesize() returns 64 by default, if + not increased when building a new kernel. getrlimit() doesn't know + RLIMIT_NOFILE. This makes event_init() always log the warning: `could + allocate space for only 64 open files'. + + I just reduced the threshold from 256 to 64, but this is not good. The + initial problem still remains: How to disable this warning on Ultrix + without making the source ugly? + +To work around the first problem, all the Makefile.in files have been updated +to use `$(SHELL)' instead of `sh'. So you only need to supply a non-default +shell in order to eliminate Ultrix shell trouble. + +To work around the latter, util/sys_defs.h was updated for Ultrix, with a +default FD_SETSIZE of 100. This should be sufficient for a workstation. Even in +1999, no-one would run a major mail hub on Ultrix 4. + |