cmd/dumpadm/minfree.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2000 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/statvfs.h>
#include <sys/param.h>
#include <sys/stat.h>

#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>

#include "utils.h"

static FILE *
minfree_open(const char *dir, int oflags, const char *fmode)
{
    char path[MAXPATHLEN];
    int fd;

    (void) snprintf(path, sizeof (path), "%s/minfree", dir);

    if ((fd = open(path, oflags, S_IRUSR | S_IWUSR)) >= 0)
        return (fdopen(fd, fmode));

    return (NULL);
}

int
minfree_read(const char *dir, unsigned long long *ullp)
{
    FILE *fp = minfree_open(dir, O_RDONLY, "r");

    if (fp != NULL) {
        char buf[BUFSIZ];
        int status = -1;

        if (fgets(buf, BUFSIZ, fp) != NULL) {
            if (valid_str2ull(buf, ullp))
                status = 0;
            else
                warn(gettext("\"%s/minfree\": invalid minfree "
                    "value -- %s\n"), dir, buf);
        }

        (void) fclose(fp);
        return (status);
    }

    return (-1);
}

int
minfree_write(const char *dir, unsigned long long ull)
{
    FILE *fp = minfree_open(dir, O_WRONLY | O_CREAT | O_TRUNC, "w");

    if (fp != NULL) {
        int status = fprintf(fp, "%llu\n", ull);
        (void) fclose(fp);
        return (status);
    }

    return (-1);
}

int
minfree_compute(const char *dir, char *s, unsigned long long *ullp)
{
    size_t len = strlen(s);
    unsigned long long m = 1;

    struct statvfs64 fsb;
    int pct;

    switch (s[len - 1]) {
    case '%':
        s[len - 1] = '\0';

        if (!valid_str2int(s, &pct) || pct > 100) {
            warn(gettext("invalid minfree %% -- %s\n"), s);
            return (-1);
        }

        if (statvfs64(dir, &fsb) == -1) {
            warn(gettext("failed to statvfs %s"), dir);
            return (-1);
        }

        *ullp = fsb.f_blocks * fsb.f_frsize *
            (u_longlong_t)pct / 100ULL / 1024ULL;

        return (0);

    case 'm':
    case 'M':
        m = 1024ULL;
        /*FALLTHRU*/

    case 'k':
    case 'K':
        s[len - 1] = '\0';

        if (valid_str2ull(s, ullp)) {
            *ullp *= m;
            return (0);
        }

        warn(gettext("invalid minfree value -- %s\n"), s);
        return (-1);

    default:
        warn(gettext("expected m, k, or %% unit after "
            "minfree -- %s\n"), s);
        return (-1);
    }
}