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/*++
/* NAME
/* mkmap_dbm 3
/* SUMMARY
/* create or open database, DBM style
/* SYNOPSIS
/* #include <mkmap.h>
/*
/* MKMAP *mkmap_dbm_open(path)
/* const char *path;
/* DESCRIPTION
/* This module implements support for creating DBM databases.
/*
/* mkmap_dbm_open() takes a file name, appends the ".dir" and ".pag"
/* suffixes, and creates or opens the named DBM database.
/* This routine is a DBM-specific helper for the more general
/* mkmap_open() routine.
/*
/* All errors are fatal.
/* SEE ALSO
/* dict_dbm(3), DBM dictionary interface.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <unistd.h>
/* Utility library. */
#include <msg.h>
#include <mymalloc.h>
#include <stringops.h>
#include <dict.h>
#include <dict_dbm.h>
#include <myflock.h>
/* Application-specific. */
#include "mkmap.h"
#ifdef HAS_DBM
#ifdef PATH_NDBM_H
#include PATH_NDBM_H
#else
#include <ndbm.h>
#endif
typedef struct MKMAP_DBM {
MKMAP mkmap; /* parent class */
char *lock_file; /* path name */
int lock_fd; /* -1 or open locked file */
} MKMAP_DBM;
/* mkmap_dbm_after_close - clean up after closing database */
static void mkmap_dbm_after_close(MKMAP *mp)
{
MKMAP_DBM *mkmap = (MKMAP_DBM *) mp;
if (mkmap->lock_fd >= 0 && close(mkmap->lock_fd) < 0)
msg_warn("close %s: %m", mkmap->lock_file);
myfree(mkmap->lock_file);
}
/* mkmap_dbm_open - create or open database */
MKMAP *mkmap_dbm_open(const char *path)
{
MKMAP_DBM *mkmap = (MKMAP_DBM *) mymalloc(sizeof(*mkmap));
char *pag_file;
int pag_fd;
/*
* Fill in the generic members.
*/
mkmap->lock_file = concatenate(path, ".dir", (char *) 0);
mkmap->mkmap.open = dict_dbm_open;
mkmap->mkmap.after_open = 0;
mkmap->mkmap.after_close = mkmap_dbm_after_close;
/*
* Unfortunately, not all systems support locking on open(), so we open
* the .dir and .pag files before truncating them. Keep one file open for
* locking.
*/
if ((mkmap->lock_fd = open(mkmap->lock_file, O_CREAT | O_RDWR, 0644)) < 0)
msg_fatal("open %s: %m", mkmap->lock_file);
pag_file = concatenate(path, ".pag", (char *) 0);
if ((pag_fd = open(pag_file, O_CREAT | O_RDWR, 0644)) < 0)
msg_fatal("open %s: %m", pag_file);
if (close(pag_fd))
msg_warn("close %s: %m", pag_file);
myfree(pag_file);
/*
* Get an exclusive lock - we're going to change the database so we can't
* have any spectators.
*/
if (myflock(mkmap->lock_fd, INTERNAL_LOCK, MYFLOCK_OP_EXCLUSIVE) < 0)
msg_fatal("lock %s: %m", mkmap->lock_file);
return (&mkmap->mkmap);
}
#endif
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