[monky] / src / fs.c

/* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
 *
 * Conky, a system monitor, based on torsmo
 *
 * Any original torsmo code is licensed under the BSD license
 *
 * All code written since the fork of torsmo is licensed under the GPL
 *
 * Please see COPYING for details
 *
 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
 * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
 *      (see AUTHORS)
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * vim: ts=4 sw=4 noet ai cindent syntax=c
 *
 */

#include "conky.h"
#include "logging.h"
#include "fs.h"
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <fcntl.h>

/* linux */
#ifdef HAVE_SYS_STATFS_H
#include <sys/statfs.h>
#endif

/* freebsd && netbsd */
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#endif

#if !defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) && !defined (__OpenBSD__) && !defined(__FreeBSD__)
#include <mntent.h>
#endif

#define MAX_FS_STATS 64

static struct fs_stat fs_stats_[MAX_FS_STATS];
struct fs_stat *fs_stats = fs_stats_;

static void update_fs_stat(struct fs_stat *fs);

void get_fs_type(const char *path, char *result);

void update_fs_stats(void)
{
        unsigned i;
        static double last_fs_update = 0.0;

        if (current_update_time - last_fs_update < 13)
                return;

        for (i = 0; i < MAX_FS_STATS; ++i) {
                if (fs_stats[i].set) {
                        update_fs_stat(&fs_stats[i]);
                }
        }
        last_fs_update = current_update_time;
}

void clear_fs_stats(void)
{
        unsigned i;
        for (i = 0; i < MAX_FS_STATS; ++i) {
                memset(&fs_stats[i], 0, sizeof(struct fs_stat));
        }
}

struct fs_stat *prepare_fs_stat(const char *s)
{
        struct fs_stat *new = 0;
        unsigned i;

        /* lookup existing or get new */
        for (i = 0; i < MAX_FS_STATS; ++i) {
                if (fs_stats[i].set) {
                        if (strncmp(fs_stats[i].path, s, DEFAULT_TEXT_BUFFER_SIZE) == 0) {
                                return &fs_stats[i];
                        }
                } else {
                        new = &fs_stats[i];
                }
        }
        /* new path */
        if (!new) {
                NORM_ERR("too many fs stats");
                return 0;
        }
        strncpy(new->path, s, DEFAULT_TEXT_BUFFER_SIZE);
        new->set = 1;
        update_fs_stat(new);
        return new;
}

static void update_fs_stat(struct fs_stat *fs)
{
        struct statfs s;

        if (statfs(fs->path, &s) == 0) {
                fs->size = (long long)s.f_blocks * s.f_bsize;
                /* bfree (root) or bavail (non-roots) ? */
                fs->avail = (long long)s.f_bavail * s.f_bsize;
                fs->free = (long long)s.f_bfree * s.f_bsize;
                get_fs_type(fs->path, fs->type);
        } else {
                fs->size = 0;
                fs->avail = 0;
                fs->free = 0;
                strncpy(fs->type, "unknown", DEFAULT_TEXT_BUFFER_SIZE);
                NORM_ERR("statfs '%s': %s", fs->path, strerror(errno));
        }
}

void get_fs_type(const char *path, char *result)
{

#if defined(HAVE_STRUCT_STATFS_F_FSTYPENAME) || defined(__FreeBSD__) || defined (__OpenBSD__)

        struct statfs s;
        if (statfs(path, &s) == 0) {
                strncpy(result, s.f_fstypename, DEFAULT_TEXT_BUFFER_SIZE);
        } else {
                NORM_ERR("statfs '%s': %s", path, strerror(errno));
        }
        return;

#else                           /* HAVE_STRUCT_STATFS_F_FSTYPENAME */

        struct mntent *me;
        FILE *mtab = setmntent("/etc/mtab", "r");
        char *search_path;
        int match;
        char *slash;

        if (mtab == NULL) {
                NORM_ERR("setmntent /etc/mtab: %s", strerror(errno));
                strncpy(result, "unknown", DEFAULT_TEXT_BUFFER_SIZE);
                return;
        }

        me = getmntent(mtab);

        // find our path in the mtab
        search_path = strdup(path);
        do {
                while ((match = strcmp(search_path, me->mnt_dir))
                                && getmntent(mtab));
                if (!match)
                        break;
                fseek(mtab, 0, SEEK_SET);
                slash = strrchr(search_path, '/');
                if (slash == NULL)
                        CRIT_ERR(NULL, NULL, "invalid path '%s'", path);
                if (strlen(slash) == 1)         /* trailing slash */
                        *(slash) = '\0';
                else if (strlen(slash) > 1)
                        *(slash + 1) = '\0';
                else
                        CRIT_ERR(NULL, NULL, "found a crack in the matrix!");
        } while (strlen(search_path) > 0);
        free(search_path);

        endmntent(mtab);

        if (me && !match) {
                strncpy(result, me->mnt_type, DEFAULT_TEXT_BUFFER_SIZE);
                return;
        }
#endif                          /* HAVE_STRUCT_STATFS_F_FSTYPENAME */

        strncpy(result, "unknown", DEFAULT_TEXT_BUFFER_SIZE);

}