cdb - read from a constant database

          #include <cdb.h>

          int cdb_seek(fd,key,len,dlen);

          int fd;
          char *key;
          unsigned int len;
          uint32 *dlen;

          cdb_seek looks up key in a constant database.  It returns 1
          if key is present, 0 if key is not present, or -1 if there
          was a read error.  key is an array of len characters.

          cdb_seek needs an open file descriptor, fd, pointing to the
          database.  If cdb_seek returns 1, it points fd at the
          beginning of the data portion of the first record indexed by
          key, and it stores the data length in dlen.  cdb_seek does
          not provide a way to read subsequent records with the same

          It's fine to do several cdb_seek lookups with the same open
          file descriptor.  Beware, however, that two simultaneous
          cdb_seek lookups can fail horribly; separate processes
          should not share the same database descriptor.  Furthermore,
          any updates after the database was opened will be invisible.
          It's rarely a good idea for a long-running program to hold a
          database open.


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