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2000-05-07 Mark Kettenis <kettenis@gnu.org> * nss/nss_db/db-open.c: Cleanup and add comments. Pretty print. Remove duplicate <errno.h> include. Remove inclusion of <libintl.h> and "nsswitch.h". (set_cloexec_flag): New function, broken out of dbopen. (dbopen): Changed return type to `enum nss_status'. Mostly rewritten to make sure that we do not report NSS_STATUS_SUCCESS if something went wrong. Remove unnecessary casts. (internal_setent): Change return type to nss_status. Document, and make sure that the function behaves accordingly. Make dynamically loading the database library really thread-safe and return NSS_STATUS_UNAVAIL if it failed. (db_cursor): Return ENOMEM is memory allocation failed. Remove unecessary casts. * nss/nss_db/dummy-db.h: Add copyright notice. Improve documentation. (struct dbc24, struct dbc27): Use DBT type in parameter lists for c_get function member. * nss/nss_db/nss_db.h: Add and tweak some comments. (DBT): Move typedef before NSS_DBC typedef. (NSS_DBC, NSS_DB): Use DBT in function member parameter lists.
95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
/* Common database open/close routines for nss_db.
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _NSS_DB_H
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#define _NSS_DB_H 1
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#include <nss.h>
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#include <stdint.h>
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/* Variables which keep track of the error values. */
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extern int db_keyexist;
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extern int db_notfound;
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/* This flag is the same for all versions of the Berkeley DB library. */
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#define DB_CREATE 0x000001
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/* But constants which vary from version to version are actually
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variables here. */
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extern int db_first;
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extern int db_next;
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extern int db_nooverwrite;
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extern int db_truncate;
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extern int db_rdonly;
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/* The `DBT' type is the same in all versions we support. */
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typedef struct
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{
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void *data;
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uint32_t size;
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uint32_t ulen;
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uint32_t dlen;
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uint32_t doff;
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uint32_t flags;
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} DBT;
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/* But the cursor object is very different from version to version. */
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typedef struct
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{
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void *cursor;
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int (*c_get) (void *, DBT *, DBT *, uint32_t);
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} NSS_DBC;
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/* We need a helper function for it. */
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extern int db_cursor (void *db, void *txn, NSS_DBC **dbcp);
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/* This is the wrapper we put around the `DB' structures to provide a
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uniform interface to the higher-level functions. */
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typedef struct
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{
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void *db;
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int (*close) (void *, uint32_t);
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int (*cursor) (void *, void *, NSS_DBC **);
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int (*fd) (void *, int *);
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int (*get) (void *, void *, DBT *, DBT *, uint32_t);
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int (*put) (void *, void *, DBT *, DBT *, uint32_t);
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} NSS_DB;
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/* Open the database stored in FILE. If succesful, store the database
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handle in *DBP and return NSS_STATUS_SUCCESS. On failure, return
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the appropriate lookup status. */
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extern enum nss_status internal_setent (const char *file, NSS_DB **dbp);
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/* Close the database *DBP. */
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extern void internal_endent (NSS_DB **dbp);
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/* Dynamically load the Berkeley DB library. Return zero if
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successful, non-zero if no suitable version of the library could be
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loaded. */
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extern enum nss_status load_db (void);
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/* Open the database in FNAME, for access specified by FLAGS. If
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opening the database causes the file FNAME to be created, it is
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created with MODE. If succesful, store the database handle in *DBP
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and return NSS_STATUS_SUCCESS. On failure, return the appropriate
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lookup status. */
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extern int dbopen (const char *fname, int oper, int mode, NSS_DB **dbp);
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#endif /* nss_db.h */
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