diff options
Diffstat (limited to 'usr.sbin/sa/db.c')
-rw-r--r-- | usr.sbin/sa/db.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/usr.sbin/sa/db.c b/usr.sbin/sa/db.c new file mode 100644 index 0000000..d31cd7c --- /dev/null +++ b/usr.sbin/sa/db.c @@ -0,0 +1,207 @@ +/*- + * Copyright (c) 2007 Diomidis Spinellis + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/acct.h> + +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <db.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <limits.h> + +#include "extern.h" + +/* Key used to store the version of the database data elements. */ +#define VERSION_KEY "\0VERSION" + +/* + * Create the in-memory database, *mdb. + * If iflag is not set, fill-in mdb with the records of the disk-based + * database dbname. + * Upgrade old-version records by calling v1_to_v2. + * Return 0 if OK, -1 on error. + */ +int +db_copy_in(DB **mdb, const char *dbname, const char *uname, BTREEINFO *bti, + int (*v1_to_v2)(DBT *key, DBT *data)) +{ + DBT key, data; + DB *ddb; + int error, rv, version; + + if ((*mdb = dbopen(NULL, O_RDWR, 0, DB_BTREE, bti)) == NULL) + return (-1); + + if (iflag) + return (0); + + if ((ddb = dbopen(dbname, O_RDONLY, 0, DB_BTREE, NULL)) == NULL) { + if (errno == ENOENT) + return (0); + warn("retrieving %s summary", uname); + db_destroy(*mdb, uname); + return (-1); + } + + error = 0; + + /* Obtain/set version. */ + version = 1; + key.data = &VERSION_KEY; + key.size = sizeof(VERSION_KEY); + + rv = DB_GET(ddb, &key, &data, 0); + if (rv < 0) { + warn("get version key from %s stats", uname); + error = -1; + goto closeout; + } else if (rv == 0) { /* It's there; verify version. */ + if (data.size != sizeof(version)) { + warnx("invalid version size %d in %s", + data.size, uname); + error = -1; + goto closeout; + } + memcpy(&version, data.data, data.size); + if (version != 2) { + warnx("unsupported version %d in %s", + version, uname); + error = -1; + goto closeout; + } + } + + for (rv = DB_SEQ(ddb, &key, &data, R_FIRST); rv == 0; + rv = DB_SEQ(ddb, &key, &data, R_NEXT)) { + + /* See if this is a version record. */ + if (key.size == sizeof(VERSION_KEY) && + memcmp(key.data, VERSION_KEY, sizeof(VERSION_KEY)) == 0) + continue; + + /* Convert record from v1, if needed. */ + if (version == 1 && v1_to_v2(&key, &data) < 0) { + warn("converting %s stats", uname); + error = -1; + goto closeout; + } + + /* Copy record to the in-memory database. */ + if ((rv = DB_PUT(*mdb, &key, &data, 0)) < 0) { + warn("initializing %s stats", uname); + error = -1; + goto closeout; + } + } + if (rv < 0) { + warn("retrieving %s summary", uname); + error = -1; + } + +closeout: + if (DB_CLOSE(ddb) < 0) { + warn("closing %s summary", uname); + error = -1; + } + + if (error) + db_destroy(*mdb, uname); + return (error); +} + +/* + * Save the in-memory database mdb to the disk database dbname. + * Return 0 if OK, -1 on error. + */ +int +db_copy_out(DB *mdb, const char *dbname, const char *uname, BTREEINFO *bti) +{ + DB *ddb; + DBT key, data; + int error, rv, version; + + if ((ddb = dbopen(dbname, O_RDWR|O_CREAT|O_TRUNC, 0644, + DB_BTREE, bti)) == NULL) { + warn("creating %s summary", uname); + return (-1); + } + + error = 0; + + for (rv = DB_SEQ(mdb, &key, &data, R_FIRST); + rv == 0; rv = DB_SEQ(mdb, &key, &data, R_NEXT)) { + if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) { + warn("saving %s summary", uname); + error = -1; + goto out; + } + } + if (rv < 0) { + warn("retrieving %s stats", uname); + error = -1; + } + +out: + /* Add a version record. */ + key.data = &VERSION_KEY; + key.size = sizeof(VERSION_KEY); + version = 2; + data.data = &version; + data.size = sizeof(version); + if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) { + warn("add version record to %s stats", uname); + error = -1; + } else if (rv == 1) { + warnx("duplicate version record in %s stats", uname); + error = -1; + } + + if (DB_SYNC(ddb, 0) < 0) { + warn("syncing %s summary", uname); + error = -1; + } + if (DB_CLOSE(ddb) < 0) { + warn("closing %s summary", uname); + error = -1; + } + return error; +} + +void +db_destroy(DB *db, const char *uname) +{ + if (DB_CLOSE(db) < 0) + warn("destroying %s stats", uname); +} |