4.29 on page 125 No Enable matching to a map that is a regular expression (V8.9
and above).
MAP_NSD ?§23.7.16 on page 929 No Support ?§2.7.34.3 on page 86 IRIX 6.5 name service maps
(V8.10 and above).
NDBM ?§3.4.30 on page 125 Yes Support Unix ndbm(3) databases.b
NETINFO ?§3.4.33 on page 127 Yes Support NeXT netinfo(3) databases.
NEWDB ?§3.4.34 on page 128 Yes Support db(3), both hash and btree forms.
NIS ?§3.4.35 on page 128 Yes Support nis maps.
NISPLUS ?§3.4.36 on page 129 Yes Support nisplus maps.
PH_MAP ?§23.7.18 on page 930 No UIUC ph database (V8.10 and above).
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
2.7 Build m4 Macro Reference | 89
If neither NDBM nor NEWDB is defined, sendmail will read the aliases into its symbol
table every time it starts. This will make sendmail crawl every time it starts up and is not
recommended.
External databases can be extremely valuable, especially in providing easy solutions for
complex problems. Therefore, we recommend that you include a definition for all databases
that your system supports, even if you don??™t immediately see a need for them.
Here we illustrate the selection of two forms of database:*
APPENDDEF(`confMAPDEF', `-DNEWDB -DNDBM')
When these two forms are selected, old databases are read by using NDBM, but new databases
are created by using NEWDB.
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