October 2007
Intermediate to advanced
1308 pages
161h 13m
English
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AliasWait
Wait for aliases file rebuild All versions
Whenever sendmail rebuilds the
aliases database, it first
clears the old database. It then rebuilds the
database and, when done, adds the special entry
@:@. Before
sendmail attempts to use the
database, it first looks in that database for the
special entry @:@
that should be present. This curious entry is
employed because it is always illegal in an
aliases file. If
sendmail doesn’t find that
entry (whether because a user ran
newaliases or because another
invocation of sendmail is
currently rebuilding it), it waits two seconds for
that entry to appear, then checks again. If the
entry is still unavailable, the wait is doubled (up
to a maximum wait of 60 seconds). The total time
waited (after all the sleeps without success) is the
interval specified by this AliasWait option.
When the @:@
appears, sendmail checks to see
whether the database still needs to be rebuilt and
rebuilds it if it does. If the special entry
@:@ does not
appear after the specified time,
sendmail assumes that some
other process died while that other process was
rebuilding the database. This assumption paves the
way for sendmail to go ahead
and rebuild the database.
The forms of the AliasWait option are as follows:
O AliasWait=delay ← configuration file (V8.7 and later) -OAliasWait=delay ← command line (V8.7 and later) define(`confALIAS_WAIT',delay) ← mc configuration (V8.7 and later) Oadelay ← configuration file (deprecated) -oadelay ← command line (deprecated)
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.