Re: Problems compiling zmailer under SunOS 4.1.1

[Mark Moraes <Mark-Moraes@deshaw.com>]

 | > Also, zmailer should be fixed *not* to use the private internal function
 | > dbm_pagfno() call so that it will be portable to 4.4bsd.
 | 
 | 	There I ask your suggestions, as the use it has is to be able to
 | 	detect, when the NDBM file has changed, and act sensibly
 | 	(Every lookup is preceded with a fstat() query, and comparison
 | 	 of file vitals - st_mtime, and st_nlink)

Knowing the file descriptor is necessary for both fstat and flock, as the
comment in the 4.3BSD ndbm.h indicates.  4.4 BSD db has a fd() method which
is intended for fcntl/flock (but the dbopen(3) manual shies away from
promising that it's adequate for fstat()), and the 4.4 ndbm emulation could
probably implement dbm_pagfno with the following changes to ndbm.h
(untested, but I *think* they should work:-)

< #define dbm_pagfno(a)   DBM_PAGFNO_NOT_AVAILABLE

> #define dbm_pagfno(a)   ((a)->fd(a))
> #define dbm_dirfno(a)   ((a)->fd(a))

	Mark.