db_checkpoint.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: db_checkpoint.c,v 12.6 2005/09/09 12:38:30 bostic Exp $
 */

#include "db_config.h"

#ifndef lint
static const char copyright[] =
    "Copyright (c) 1996-2005\nSleepycat Software Inc.  All rights reserved.\n";
#endif

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#if TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif

#include "db_int.h"

int      db_checkpoint_main __P((int, char *[]));
int      db_checkpoint_usage __P((void));
int      db_checkpoint_version_check __P((void));

const char *progname;

int
db_checkpoint(args)
        char *args;
{
        int argc;
        char **argv;

        __db_util_arg("db_checkpoint", args, &argc, &argv);
        return (db_checkpoint_main(argc, argv) ? EXIT_FAILURE : EXIT_SUCCESS);
}

#include <stdio.h>
#define ERROR_RETURN    ERROR

int
db_checkpoint_main(argc, argv)
        int argc;
        char *argv[];
{
        extern char *optarg;
        extern int optind, __db_getopt_reset;
        DB_ENV  *dbenv;
        time_t now;
        long argval;
        u_int32_t flags, kbytes, minutes, seconds;
        int ch, exitval, once, ret, verbose;
        char *home, *logfile, *passwd;

        if ((progname = strrchr(argv[0], '/')) == NULL)
                progname = argv[0];
        else
                ++progname;

        if ((ret = db_checkpoint_version_check()) != 0)
                return (ret);

        /*
         * !!!
         * Don't allow a fully unsigned 32-bit number, some compilers get
         * upset and require it to be specified in hexadecimal and so on.
         */
#define MAX_UINT32_T    2147483647

        dbenv = NULL;
        kbytes = minutes = 0;
        exitval = once = verbose = 0;
        flags = 0;
        home = logfile = passwd = NULL;
        __db_getopt_reset = 1;
        while ((ch = getopt(argc, argv, "1h:k:L:P:p:Vv")) != EOF)
                switch (ch) {
                case '1':
                        once = 1;
                        flags = DB_FORCE;
                        break;
                case 'h':
                        home = optarg;
                        break;
                case 'k':
                        if (__db_getlong(NULL, progname,
                            optarg, 1, (long)MAX_UINT32_T, &argval))
                                return (EXIT_FAILURE);
                        kbytes = (u_int32_t)argval;
                        break;
                case 'L':
                        logfile = optarg;
                        break;
                case 'P':
                        passwd = strdup(optarg);
                        memset(optarg, 0, strlen(optarg));
                        if (passwd == NULL) {
                                fprintf(stderr, "%s: strdup: %s\n",
                                    progname, strerror(errno));
                                return (EXIT_FAILURE);
                        }
                        break;
                case 'p':
                        if (__db_getlong(NULL, progname,
                            optarg, 1, (long)MAX_UINT32_T, &argval))
                                return (EXIT_FAILURE);
                        minutes = (u_int32_t)argval;
                        break;
                case 'V':
                        printf("%s\n", db_version(NULL, NULL, NULL));
                        return (EXIT_SUCCESS);
                case 'v':
                        verbose = 1;
                        break;
                case '?':
                default:
                        return (db_checkpoint_usage());
                }
        argc -= optind;
        argv += optind;

        if (argc != 0)
                return (db_checkpoint_usage());

        if (once == 0 && kbytes == 0 && minutes == 0) {
                (void)fprintf(stderr,
                    "%s: at least one of -1, -k and -p must be specified\n",
                    progname);
                return (EXIT_FAILURE);
        }

        /* Handle possible interruptions. */
        __db_util_siginit();

        /* Log our process ID. */
        if (logfile != NULL && __db_util_logset(progname, logfile))
                goto shutdown;

        /*
         * Create an environment object and initialize it for error
         * reporting.
         */
        if ((ret = db_env_create(&dbenv, 0)) != 0) {
                fprintf(stderr,
                    "%s: db_env_create: %s\n", progname, db_strerror(ret));
                goto shutdown;
        }

        dbenv->set_errfile(dbenv, stderr);
        dbenv->set_errpfx(dbenv, progname);

        if (passwd != NULL && (ret = dbenv->set_encrypt(dbenv,
            passwd, DB_ENCRYPT_AES)) != 0) {
                dbenv->err(dbenv, ret, "set_passwd");
                goto shutdown;
        }
        /* Initialize the environment. */
        if ((ret = dbenv->open(dbenv, home, DB_USE_ENVIRON, 0)) != 0) {
                dbenv->err(dbenv, ret, "open");
                goto shutdown;
        }

        /*
         * If we have only a time delay, then we'll sleep the right amount
         * to wake up when a checkpoint is necessary.  If we have a "kbytes"
         * field set, then we'll check every 30 seconds.
         */
        seconds = kbytes != 0 ? 30 : minutes * 60;
        while (!__db_util_interrupted()) {
                if (verbose) {
                        (void)time(&now);
                        dbenv->errx(dbenv, "checkpoint begin: %s", ctime(&now));
                }

                if ((ret = dbenv->txn_checkpoint(dbenv,
                    kbytes, minutes, flags)) != 0) {
                        dbenv->err(dbenv, ret, "txn_checkpoint");
                        goto shutdown;
                }

                if (verbose) {
                        (void)time(&now);
                        dbenv->errx(dbenv,
                            "checkpoint complete: %s", ctime(&now));
                }

                if (once)
                        break;

                __os_sleep(dbenv, seconds, 0);
        }

        if (0) {
shutdown:       exitval = 1;
        }

        /* Clean up the logfile. */
        if (logfile != NULL)
                (void)remove(logfile);

        /* Clean up the environment. */
        if (dbenv != NULL && (ret = dbenv->close(dbenv, 0)) != 0) {
                exitval = 1;
                fprintf(stderr,
                    "%s: dbenv->close: %s\n", progname, db_strerror(ret));
        }

        if (passwd != NULL)
                free(passwd);

        /* Resend any caught signal. */
        __db_util_sigresend();

        return (exitval == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}

int
db_checkpoint_usage()
{
        (void)fprintf(stderr, "usage: %s [-1Vv]\n\t%s\n", progname,
            "[-h home] [-k kbytes] [-L file] [-P password] [-p min]");
        return (EXIT_FAILURE);
}

int
db_checkpoint_version_check()
{
        int v_major, v_minor, v_patch;

        /* Make sure we're loaded with the right version of the DB library. */
        (void)db_version(&v_major, &v_minor, &v_patch);
        if (v_major != DB_VERSION_MAJOR || v_minor != DB_VERSION_MINOR) {
                fprintf(stderr,
        "%s: version %d.%d doesn't match library version %d.%d\n",
                    progname, DB_VERSION_MAJOR, DB_VERSION_MINOR,
                    v_major, v_minor);
                return (EXIT_FAILURE);
        }
        return (0);
}

---