fixing warning

[monky] / src / linux.c

/* 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) 2007 Toni Spets
 * Copyright (c) 2005-2007 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/>.
 *
 * $Id$ */

#include "conky.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/sysinfo.h>
#include <sys/stat.h>
#ifndef HAVE_CLOCK_GETTIME
#include <sys/time.h>
#endif
#include <fcntl.h>
#include <unistd.h>
// #include <assert.h>
#include <time.h>
#include "top.h"

#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/sockios.h>
#include <net/if.h>
#include <math.h>

#ifdef HAVE_IWLIB
#include <iwlib.h>
#endif

#define SHORTSTAT_TEMPL "%*s %llu %llu %llu"
#define LONGSTAT_TEMPL "%*s %llu %llu %llu "

static int show_nice_processes;

/* This flag tells the linux routines to use the /proc system where possible,
 * even if other api's are available, e.g. sysinfo() or getloadavg().
 * the reason for this is to allow for /proc-based distributed monitoring.
 * using a flag in this manner creates less confusing code. */
static int prefer_proc = 0;

void prepare_update()
{
}

void update_uptime()
{
#ifdef HAVE_SYSINFO
        if (!prefer_proc) {
                struct sysinfo s_info;

                sysinfo(&s_info);
                info.uptime = (double) s_info.uptime;
        } else
#endif
        {
                static int rep = 0;
                FILE *fp;

                if (!(fp = open_file("/proc/uptime", &rep))) {
                        info.uptime = 0.0;
                        return;
                }
                fscanf(fp, "%lf", &info.uptime);
                fclose(fp);
        }
        info.mask |= (1 << INFO_UPTIME);
}

int check_mount(char *s)
{
        int ret = 0;
        FILE *mtab = fopen("/etc/mtab", "r");

        if (mtab) {
                char buf1[256], buf2[128];

                while (fgets(buf1, 256, mtab)) {
                        sscanf(buf1, "%*s %128s", buf2);
                        if (!strcmp(s, buf2)) {
                                ret = 1;
                                break;
                        }
                }
                fclose(mtab);
        } else {
                ERR("Could not open mtab");
        }
        return ret;
}

/* these things are also in sysinfo except Buffers:
 * (that's why I'm reading them from proc) */

void update_meminfo()
{
        FILE *meminfo_fp;
        static int rep = 0;

        /* unsigned int a; */
        char buf[256];

        info.mem = info.memmax = info.swap = info.swapmax = info.bufmem =
                info.buffers = info.cached = 0;

        if (!(meminfo_fp = open_file("/proc/meminfo", &rep))) {
                return;
        }

        while (!feof(meminfo_fp)) {
                if (fgets(buf, 255, meminfo_fp) == NULL) {
                        break;
                }

                if (strncmp(buf, "MemTotal:", 9) == 0) {
                        sscanf(buf, "%*s %Lu", &info.memmax);
                } else if (strncmp(buf, "MemFree:", 8) == 0) {
                        sscanf(buf, "%*s %Lu", &info.mem);
                } else if (strncmp(buf, "SwapTotal:", 10) == 0) {
                        sscanf(buf, "%*s %Lu", &info.swapmax);
                } else if (strncmp(buf, "SwapFree:", 9) == 0) {
                        sscanf(buf, "%*s %Lu", &info.swap);
                } else if (strncmp(buf, "Buffers:", 8) == 0) {
                        sscanf(buf, "%*s %Lu", &info.buffers);
                } else if (strncmp(buf, "Cached:", 7) == 0) {
                        sscanf(buf, "%*s %Lu", &info.cached);
                }
        }

        info.mem = info.memmax - info.mem;
        info.swap = info.swapmax - info.swap;

        info.bufmem = info.cached + info.buffers;

        info.mask |= (1 << INFO_MEM) | (1 << INFO_BUFFERS);

        fclose(meminfo_fp);
}

int interface_up(const char *dev)
{
        int fd;
        struct ifreq ifr;

        if((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
                CRIT_ERR("could not create sockfd");
                return 0;
        }
        strncpy(ifr.ifr_name, dev, IFNAMSIZ);
        if(ioctl(fd, SIOCGIFFLAGS, &ifr)) {
                /* if device does not exist, treat like not up */
                if (errno != ENODEV)
                        perror("SIOCGIFFLAGS");
        } else {
                close(fd);
                return (ifr.ifr_flags & IFF_UP);
        }
        close(fd);
        return 0;
}

inline void update_net_stats()
{
        FILE *net_dev_fp;
        static int rep = 0;

        // FIXME: arbitrary size chosen to keep code simple.
        int i, i2;
        unsigned int curtmp1, curtmp2;
        unsigned int k;
        struct ifconf conf;
        char buf[256];
        double delta;

#ifdef HAVE_IWLIB
        // wireless info variables
        int skfd, has_bitrate = 0;
        struct wireless_info *winfo;
        struct iwreq wrq;
#endif

        /* get delta */
        delta = current_update_time - last_update_time;
        if (delta <= 0.0001) {
                return;
        }

        /* open file and ignore first two lines */
        if (!(net_dev_fp = open_file("/proc/net/dev", &rep))) {
                clear_net_stats();
                return;
        }

        fgets(buf, 255, net_dev_fp);    /* garbage */
        fgets(buf, 255, net_dev_fp);    /* garbage (field names) */

        /* read each interface */
        for (i2 = 0; i2 < 16; i2++) {
                struct net_stat *ns;
                char *s, *p;
        char temp_addr[17];
                long long r, t, last_recv, last_trans;

                if (fgets(buf, 255, net_dev_fp) == NULL) {
                        break;
                }
                p = buf;
                while (isspace((int) *p)) {
                        p++;
                }

                s = p;

                while (*p && *p != ':') {
                        p++;
                }
                if (*p == '\0') {
                        continue;
                }
                *p = '\0';
                p++;

                ns = get_net_stat(s);
                ns->up = 1;
                memset(&(ns->addr.sa_data), 0, 14);
 
        if(NULL == ns->addrs)
            ns->addrs = (char*) malloc(17 * 16);
        if(NULL != ns->addrs)
             memset(ns->addrs, 0, 17 * 16); /* Up to 17 chars per ip, max 16 interfaces. Nasty memory usage... */
 
                last_recv = ns->recv;
                last_trans = ns->trans;

                /* bytes packets errs drop fifo frame compressed multicast|bytes ... */
                sscanf(p, "%Ld  %*d     %*d  %*d  %*d  %*d   %*d        %*d       %Ld",
                        &r, &t);

                /* if recv or trans is less than last time, an overflow happened */
                if (r < ns->last_read_recv) {
                        last_recv = 0;
                } else {
                        ns->recv += (r - ns->last_read_recv);
                }
                ns->last_read_recv = r;

                if (t < ns->last_read_trans) {
                        last_trans = 0;
                } else {
                        ns->trans += (t - ns->last_read_trans);
                }
                ns->last_read_trans = t;

                /*** ip addr patch ***/
                i = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);

                conf.ifc_buf = malloc(sizeof(struct ifreq) * 16);

                conf.ifc_len = sizeof(struct ifreq) * 16;

                ioctl((long) i, SIOCGIFCONF, &conf);

                for (k = 0; k < conf.ifc_len / sizeof(struct ifreq); k++) {
                        struct net_stat *ns;

                        ns = get_net_stat(
                                ((struct ifreq *) conf.ifc_buf)[k].ifr_ifrn.ifrn_name);
                        ns->addr = ((struct ifreq *) conf.ifc_buf)[k].ifr_ifru.ifru_addr;
           if(NULL != ns->addrs)
           {
               sprintf(temp_addr, "%u.%u.%u.%u, ",
                   ns->addr.sa_data[2] & 255,
                   ns->addr.sa_data[3] & 255,
                   ns->addr.sa_data[4] & 255,
                   ns->addr.sa_data[5] & 255);
               if(NULL == strstr(ns->addrs, temp_addr))
                   strncpy(ns->addrs + strlen(ns->addrs), temp_addr, 17);
            }
                }

                close((long) i);

                free(conf.ifc_buf);

                /*** end ip addr patch ***/

                /* calculate speeds */
                ns->net_rec[0] = (ns->recv - last_recv) / delta;
                ns->net_trans[0] = (ns->trans - last_trans) / delta;
                curtmp1 = 0;
                curtmp2 = 0;
                // get an average
                for (i = 0; (unsigned) i < info.net_avg_samples; i++) {
                        curtmp1 += ns->net_rec[i];
                        curtmp2 += ns->net_trans[i];
                }
                if (curtmp1 == 0) {
                        curtmp1 = 1;
                }
                if (curtmp2 == 0) {
                        curtmp2 = 1;
                }
                ns->recv_speed = curtmp1 / (double) info.net_avg_samples;
                ns->trans_speed = curtmp2 / (double) info.net_avg_samples;
                if (info.net_avg_samples > 1) {
                        for (i = info.net_avg_samples; i > 1; i--) {
                                ns->net_rec[i - 1] = ns->net_rec[i - 2];
                                ns->net_trans[i - 1] = ns->net_trans[i - 2];
                        }
                }

#ifdef HAVE_IWLIB
                /* update wireless info */
                winfo = malloc(sizeof(struct wireless_info));
                memset(winfo, 0, sizeof(struct wireless_info));

                skfd = iw_sockets_open();
                if (iw_get_basic_config(skfd, s, &(winfo->b)) > -1) {

                        // set present winfo variables
                        if (iw_get_stats(skfd, s, &(winfo->stats),
                                        &winfo->range, winfo->has_range) >= 0) {
                                winfo->has_stats = 1;
                        }
                        if (iw_get_range_info(skfd, s, &(winfo->range)) >= 0) {
                                winfo->has_range = 1;
                        }
                        if (iw_get_ext(skfd, s, SIOCGIWAP, &wrq) >= 0) {
                                winfo->has_ap_addr = 1;
                                memcpy(&(winfo->ap_addr), &(wrq.u.ap_addr), sizeof(sockaddr));
                        }

                        // get bitrate
                        if (iw_get_ext(skfd, s, SIOCGIWRATE, &wrq) >= 0) {
                                memcpy(&(winfo->bitrate), &(wrq.u.bitrate), sizeof(iwparam));
                                iw_print_bitrate(ns->bitrate, 16, winfo->bitrate.value);
                                has_bitrate = 1;
                        }

                        // get link quality
                        if (winfo->has_range && winfo->has_stats
                                        && ((winfo->stats.qual.level != 0)
                                        || (winfo->stats.qual.updated & IW_QUAL_DBM))) {
                                if (!(winfo->stats.qual.updated & IW_QUAL_QUAL_INVALID)) {
                                        ns->link_qual = winfo->stats.qual.qual;
                                        ns->link_qual_max = winfo->range.max_qual.qual;
                                }
                        }

                        // get ap mac
                        if (winfo->has_ap_addr) {
                                iw_sawap_ntop(&winfo->ap_addr, ns->ap);
                        }

                        // get essid
                        if (winfo->b.has_essid) {
                                if (winfo->b.essid_on) {
                                        snprintf(ns->essid, 32, "%s", winfo->b.essid);
                                } else {
                                        snprintf(ns->essid, 32, "off/any");
                                }
                        }

                        snprintf(ns->mode, 16, "%s", iw_operation_mode[winfo->b.mode]);
                }
                iw_sockets_close(skfd);
                free(winfo);
#endif
        }

        fclose(net_dev_fp);

        info.mask |= (1 << INFO_NET);
}

int result;

void update_total_processes()
{
#ifdef HAVE_SYSINFO
        if (!prefer_proc) {
                struct sysinfo s_info;

                sysinfo(&s_info);
                info.procs = s_info.procs;
        } else
#endif
        {
                static int rep = 0;
                FILE *fp;

                if (!(fp = open_file("/proc/loadavg", &rep))) {
                        info.procs = 0;
                        return;
                }
                fscanf(fp, "%*f %*f %*f %*d/%hd", &info.procs);
                fclose(fp);
        }
        info.mask |= (1 << INFO_PROCS);
}

#define CPU_SAMPLE_COUNT 15
struct cpu_info {
        unsigned long long cpu_user;
        unsigned long long cpu_system;
        unsigned long long cpu_nice;
        unsigned long long cpu_idle;
        unsigned long long cpu_iowait;
        unsigned long long cpu_irq;
        unsigned long long cpu_softirq;
        unsigned long long cpu_steal;
        unsigned long long cpu_total;
        unsigned long long cpu_active_total;
        unsigned long long cpu_last_total;
        unsigned long long cpu_last_active_total;
        double cpu_val[CPU_SAMPLE_COUNT];
};
static short cpu_setup = 0;

/* Determine if this kernel gives us "extended" statistics information in
 * /proc/stat.
 * Kernels around 2.5 and earlier only reported user, system, nice, and
 * idle values in proc stat.
 * Kernels around 2.6 and greater report these PLUS iowait, irq, softirq,
 * and steal */
void determine_longstat(char *buf)
{
        unsigned long long iowait = 0;

        KFLAG_SETOFF(KFLAG_IS_LONGSTAT);
        /* scanf will either return -1 or 1 because there is only 1 assignment */
        if (sscanf(buf, "%*s %*d %*d %*d %*d %llu", &iowait) > 0) {
                KFLAG_SETON(KFLAG_IS_LONGSTAT);
        }
}

void get_cpu_count()
{
        FILE *stat_fp;
        static int rep = 0;

        if (info.cpu_usage) {
                return;
        }
        char buf[256];

        if (!(stat_fp = open_file("/proc/stat", &rep))) {
                return;
        }

        info.cpu_count = 0;

        while (!feof(stat_fp)) {
                if (fgets(buf, 255, stat_fp) == NULL) {
                        break;
                }

                if (strncmp(buf, "cpu", 3) == 0 && isdigit(buf[3])) {
                        if (info.cpu_count == 0) {
                                determine_longstat(buf);
                        }
                        info.cpu_count++;
                }
        }
        info.cpu_usage = malloc((info.cpu_count + 1) * sizeof(float));

        fclose(stat_fp);
}

#define TMPL_LONGSTAT "%*s %llu %llu %llu %llu %llu %llu %llu %llu"
#define TMPL_SHORTSTAT "%*s %llu %llu %llu %llu"

inline static void update_stat()
{
        FILE *stat_fp;
        static int rep = 0;
        static struct cpu_info *cpu = NULL;
        char buf[256];
        unsigned int i;
        unsigned int index;
        double curtmp;
        char *stat_template = NULL;
        unsigned int malloc_cpu_size = 0;

        /* add check for !info.cpu_usage since that mem is freed on a SIGUSR1 */
        if (!cpu_setup || !info.cpu_usage) {
                get_cpu_count();
                cpu_setup = 1;
        }

        if (!stat_template) {
                stat_template =
                        KFLAG_ISSET(KFLAG_IS_LONGSTAT) ? TMPL_LONGSTAT : TMPL_SHORTSTAT;
        }

        if (!cpu) {
                malloc_cpu_size = (info.cpu_count + 1) * sizeof(struct cpu_info);
                cpu = malloc(malloc_cpu_size);
                memset(cpu, 0, malloc_cpu_size);
        }

        if (!(stat_fp = open_file("/proc/stat", &rep))) {
                info.run_procs = 0;
                if (info.cpu_usage) {
                        memset(info.cpu_usage, 0, info.cpu_count * sizeof(float));
                }
                return;
        }

        index = 0;
        while (!feof(stat_fp)) {
                if (fgets(buf, 255, stat_fp) == NULL) {
                        break;
                }

                if (strncmp(buf, "procs_running ", 14) == 0) {
                        sscanf(buf, "%*s %hu", &info.run_procs);
                        info.mask |= (1 << INFO_RUN_PROCS);
                } else if (strncmp(buf, "cpu", 3) == 0) {
                        index = isdigit(buf[3]) ? ((int) buf[3]) - 0x2F : 0;
                        sscanf(buf, stat_template, &(cpu[index].cpu_user),
                                &(cpu[index].cpu_nice), &(cpu[index].cpu_system),
                                &(cpu[index].cpu_idle), &(cpu[index].cpu_iowait),
                                &(cpu[index].cpu_irq), &(cpu[index].cpu_softirq),
                                &(cpu[index].cpu_steal));

                        cpu[index].cpu_total = cpu[index].cpu_user + cpu[index].cpu_nice +
                                cpu[index].cpu_system + cpu[index].cpu_idle +
                                cpu[index].cpu_iowait + cpu[index].cpu_irq +
                                cpu[index].cpu_softirq + cpu[index].cpu_steal;

                        cpu[index].cpu_active_total = cpu[index].cpu_total -
                                (cpu[index].cpu_idle + cpu[index].cpu_iowait);
                        info.mask |= (1 << INFO_CPU);

                        double delta = current_update_time - last_update_time;

                        if (delta <= 0.001) {
                                break;
                        }

                        cpu[index].cpu_val[0] = (cpu[index].cpu_active_total -
                                cpu[index].cpu_last_active_total) /
                                (float) (cpu[index].cpu_total - cpu[index].cpu_last_total);
                        curtmp = 0;
                        for (i = 0; i < info.cpu_avg_samples; i++) {
                                curtmp += cpu[index].cpu_val[i];
                        }
                        /* TESTING -- I've removed this, because I don't think it is right.
                         * You shouldn't divide by the cpu count here ...
                         * removing for testing */
                        /* if (index == 0) {
                                info.cpu_usage[index] = curtmp / info.cpu_avg_samples /
                                        info.cpu_count;
                        } else {
                                info.cpu_usage[index] = curtmp / info.cpu_avg_samples;
                        } */
                        /* TESTING -- this line replaces the prev. "suspect" if/else */
                        info.cpu_usage[index] = curtmp / info.cpu_avg_samples;

                        cpu[index].cpu_last_total = cpu[index].cpu_total;
                        cpu[index].cpu_last_active_total = cpu[index].cpu_active_total;
                        for (i = info.cpu_avg_samples - 1; i > 0; i--) {
                                cpu[index].cpu_val[i] = cpu[index].cpu_val[i - 1];
                        }
                }
        }
        fclose(stat_fp);
}

void update_running_processes()
{
        update_stat();
}

void update_cpu_usage()
{
        update_stat();
}

void update_load_average()
{
#ifdef HAVE_GETLOADAVG
        if (!prefer_proc) {
                double v[3];

                getloadavg(v, 3);
                info.loadavg[0] = (float) v[0];
                info.loadavg[1] = (float) v[1];
                info.loadavg[2] = (float) v[2];
        } else
#endif
        {
                static int rep = 0;
                FILE *fp;

                if (!(fp = open_file("/proc/loadavg", &rep))) {
                        info.loadavg[0] = info.loadavg[1] = info.loadavg[2] = 0.0;
                        return;
                }
                fscanf(fp, "%f %f %f", &info.loadavg[0], &info.loadavg[1],
                        &info.loadavg[2]);
                fclose(fp);
        }
        info.mask |= (1 << INFO_LOADAVG);
}

#define PROC_I8K "/proc/i8k"
#define I8K_DELIM " "
static char *i8k_procbuf = NULL;
void update_i8k()
{
        FILE *fp;

        if (!i8k_procbuf) {
                i8k_procbuf = (char *) malloc(128 * sizeof(char));
        }
        if ((fp = fopen(PROC_I8K, "r")) == NULL) {
                CRIT_ERR("/proc/i8k doesn't exist! use insmod to make sure the kernel "
                        "driver is loaded...");
        }

        memset(&i8k_procbuf[0], 0, 128);
        if (fread(&i8k_procbuf[0], sizeof(char), 128, fp) == 0) {
                ERR("something wrong with /proc/i8k...");
        }

        fclose(fp);

        i8k.version = strtok(&i8k_procbuf[0], I8K_DELIM);
        i8k.bios = strtok(NULL, I8K_DELIM);
        i8k.serial = strtok(NULL, I8K_DELIM);
        i8k.cpu_temp = strtok(NULL, I8K_DELIM);
        i8k.left_fan_status = strtok(NULL, I8K_DELIM);
        i8k.right_fan_status = strtok(NULL, I8K_DELIM);
        i8k.left_fan_rpm = strtok(NULL, I8K_DELIM);
        i8k.right_fan_rpm = strtok(NULL, I8K_DELIM);
        i8k.ac_status = strtok(NULL, I8K_DELIM);
        i8k.buttons_status = strtok(NULL, I8K_DELIM);
}

/***********************************************************/
/***********************************************************/
/***********************************************************/

static int no_dots(const struct dirent *d)
{
        if (d->d_name[0] == '.') {
                return 0;
        }
        return 1;
}

static int get_first_file_in_a_directory(const char *dir, char *s, int *rep)
{
        struct dirent **namelist;
        int i, n;

        n = scandir(dir, &namelist, no_dots, alphasort);
        if (n < 0) {
                if (!rep || !*rep) {
                        ERR("scandir for %s: %s", dir, strerror(errno));
                        if (rep) {
                                *rep = 1;
                        }
                }
                return 0;
        } else {
                if (n == 0) {
                        return 0;
                }

                strncpy(s, namelist[0]->d_name, 255);
                s[255] = '\0';

                for (i = 0; i < n; i++) {
                        free(namelist[i]);
                }
                free(namelist);

                return 1;
        }
}

int open_sysfs_sensor(const char *dir, const char *dev, const char *type, int n,
                int *div, char *devtype)
{
        char path[256];
        char buf[256];
        int fd;
        int divfd;

        memset(buf, 0, sizeof(buf));

        /* if device is NULL or *, get first */
        if (dev == NULL || strcmp(dev, "*") == 0) {
                static int rep = 0;

                if (!get_first_file_in_a_directory(dir, buf, &rep)) {
                        return -1;
                }
                dev = buf;
        }

        if (strcmp(dir, "/sys/class/hwmon/") == 0) {
                if (*buf) {
                        /* buf holds result from get_first_file_in_a_directory() above,
                         * e.g. "hwmon0" -- append "/device" */
                        strcat(buf, "/device");
                } else {
                        /* dev holds device number N as a string,
                         * e.g. "0", -- convert to "hwmon0/device" */
                        sprintf(buf, "hwmon%s/device", dev);
                        dev = buf;
                }
        }

        /* change vol to in */
        if (strcmp(type, "vol") == 0) {
                type = "in";
        }

        if (strcmp(type, "tempf") == 0) {
                snprintf(path, 255, "%s%s/%s%d_input", dir, dev, "temp", n);
        } else {
                snprintf(path, 255, "%s%s/%s%d_input", dir, dev, type, n);
        }
        strncpy(devtype, path, 255);

        /* open file */
        fd = open(path, O_RDONLY);
        if (fd < 0) {
                CRIT_ERR("can't open '%s': %s\nplease check your device or remove this "
                        "var from Conky", path, strerror(errno));
        }

        if (strcmp(type, "in") == 0 || strcmp(type, "temp") == 0
                        || strcmp(type, "tempf") == 0) {
                *div = 1;
        } else {
                *div = 0;
        }
        /* fan does not use *_div as a read divisor */
        if (strcmp("fan", type) == 0) {
                return fd;
        }

        /* test if *_div file exist, open it and use it as divisor */
        if (strcmp(type, "tempf") == 0) {
                snprintf(path, 255, "%s%s/%s%d_div", dir, "one", "two", n);
        } else {
                snprintf(path, 255, "%s%s/%s%d_div", dir, dev, type, n);
        }

        divfd = open(path, O_RDONLY);
        if (divfd > 0) {
                /* read integer */
                char divbuf[64];
                int divn;

                divn = read(divfd, divbuf, 63);
                /* should read until n == 0 but I doubt that kernel will give these
                 * in multiple pieces. :) */
                if (divn < 0) {
                        ERR("open_sysfs_sensor(): can't read from sysfs");
                } else {
                        divbuf[divn] = '\0';
                        *div = atoi(divbuf);
                }
        }

        close(divfd);

        return fd;
}

double get_sysfs_info(int *fd, int div, char *devtype, char *type)
{
        int val = 0;

        if (*fd <= 0) {
                return 0;
        }

        lseek(*fd, 0, SEEK_SET);

        /* read integer */
        {
                char buf[64];
                int n;
                n = read(*fd, buf, 63);
                /* should read until n == 0 but I doubt that kernel will give these
                 * in multiple pieces. :) */
                if (n < 0) {
                        ERR("get_sysfs_info(): read from %s failed\n", devtype);
                } else {
                        buf[n] = '\0';
                        val = atoi(buf);
                }
        }

        close(*fd);
        /* open file */
        *fd = open(devtype, O_RDONLY);
        if (*fd < 0) {
                ERR("can't open '%s': %s", devtype, strerror(errno));
        }

        /* My dirty hack for computing CPU value
         * Filedil, from forums.gentoo.org */
        /* if (strstr(devtype, "temp1_input") != NULL) {
                return -15.096 + 1.4893 * (val / 1000.0);
        } */

        /* divide voltage and temperature by 1000 */
        /* or if any other divisor is given, use that */
        if (strcmp(type, "tempf") == 0) {
                if (div > 1) {
                        return ((val / div + 40) * 9.0 / 5) - 40;
                } else if (div) {
                        return ((val / 1000.0 + 40) * 9.0 / 5) - 40;
                } else {
                        return ((val + 40) * 9.0 / 5) - 40;
                }
        } else {
                if (div > 1) {
                        return val / div;
                } else if (div) {
                        return val / 1000.0;
                } else {
                        return val;
                }
        }
}

/* Prior to kernel version 2.6.12, the CPU fan speed was available in
 * ADT746X_FAN_OLD, whereas later kernel versions provide this information in
 * ADT746X_FAN. */
#define ADT746X_FAN "/sys/devices/temperatures/sensor1_fan_speed"
#define ADT746X_FAN_OLD "/sys/devices/temperatures/cpu_fan_speed"

void get_adt746x_fan(char *p_client_buffer, size_t client_buffer_size)
{
        static int rep = 0;
        char adt746x_fan_state[64];
        FILE *fp;

        if (!p_client_buffer || client_buffer_size <= 0) {
                return;
        }

        if ((fp = open_file(ADT746X_FAN, &rep)) == NULL
                        && (fp = open_file(ADT746X_FAN_OLD, &rep)) == NULL) {
                sprintf(adt746x_fan_state, "adt746x not found");
        } else {
                fgets(adt746x_fan_state, sizeof(adt746x_fan_state), fp);
                adt746x_fan_state[strlen(adt746x_fan_state) - 1] = 0;
                fclose(fp);
        }

        snprintf(p_client_buffer, client_buffer_size, "%s", adt746x_fan_state);
}

/* Prior to kernel version 2.6.12, the CPU temperature was found in
 * ADT746X_CPU_OLD, whereas later kernel versions provide this information in
 * ADT746X_CPU. */
#define ADT746X_CPU "/sys/devices/temperatures/sensor1_temperature"
#define ADT746X_CPU_OLD "/sys/devices/temperatures/cpu_temperature"

void get_adt746x_cpu(char *p_client_buffer, size_t client_buffer_size)
{
        static int rep = 0;
        char adt746x_cpu_state[64];
        FILE *fp;

        if (!p_client_buffer || client_buffer_size <= 0) {
                return;
        }

        if ((fp = open_file(ADT746X_CPU, &rep)) == NULL
                        && (fp = open_file(ADT746X_CPU_OLD, &rep)) == NULL) {
                sprintf(adt746x_cpu_state, "adt746x not found");
        } else {
                fscanf(fp, "%2s", adt746x_cpu_state);
                fclose(fp);
        }

        snprintf(p_client_buffer, client_buffer_size, "%s", adt746x_cpu_state);
}

/* Thanks to "Walt Nelson" <wnelsonjr@comcast.net> */

/***********************************************************************/
/* This file is part of x86info.
 * (C) 2001 Dave Jones.
 *
 * Licensed under the terms of the GNU GPL License version 2.
 *
 * Estimate CPU MHz routine by Andrea Arcangeli <andrea@suse.de>
 * Small changes by David Sterba <sterd9am@ss1000.ms.mff.cuni.cz> */

#if  defined(__i386) || defined(__x86_64)
__inline__ unsigned long long int rdtsc()
{
        unsigned long long int x;

        __asm__ volatile(".byte 0x0f, 0x31":"=A" (x));
        return x;
}
#endif

/* return system frequency in MHz (use divisor=1) or GHz (use divisor=1000) */
void get_freq_dynamic(char *p_client_buffer, size_t client_buffer_size,
                char *p_format, int divisor)
{
#if  defined(__i386) || defined(__x86_64)
        struct timezone tz;
        struct timeval tvstart, tvstop;
        unsigned long long cycles[2];   /* gotta be 64 bit */
        unsigned int microseconds;      /* total time taken */

        if (!p_client_buffer || client_buffer_size <= 0 || !p_format
                        || divisor <= 0) {
                return;
        }

        memset(&tz, 0, sizeof(tz));

        /* get this function in cached memory */
        gettimeofday(&tvstart, &tz);
        cycles[0] = rdtsc();
        gettimeofday(&tvstart, &tz);

        /* we don't trust that this is any specific length of time */
        usleep(100);
        cycles[1] = rdtsc();
        gettimeofday(&tvstop, &tz);
        microseconds = ((tvstop.tv_sec - tvstart.tv_sec) * 1000000) +
                (tvstop.tv_usec - tvstart.tv_usec);

        snprintf(p_client_buffer, client_buffer_size, p_format,
                (float) ((cycles[1] - cycles[0]) / microseconds) / divisor);
        return;
#else
        /* FIXME: hardwired: get freq for first cpu!
         * this whole function needs to be rethought and redone for
         * multi-cpu/multi-core/multi-threaded environments and
         * arbitrary combinations thereof */
        get_freq(p_client_buffer, client_buffer_size, p_format, divisor, 1);
        return;
#endif
}

#define CPUFREQ_PREFIX "/sys/devices/system/cpu"
#define CPUFREQ_POSTFIX "cpufreq/scaling_cur_freq"

/* return system frequency in MHz (use divisor=1) or GHz (use divisor=1000) */
char get_freq(char *p_client_buffer, size_t client_buffer_size, char *p_format,
                int divisor, unsigned int cpu)
{
        FILE *f;
        static int rep = 0;
        char frequency[32];
        char s[256];
        double freq = 0;

        if (!p_client_buffer || client_buffer_size <= 0 || !p_format
                        || divisor <= 0) {
                return 0;
        }

        if (!prefer_proc) {
                char current_freq_file[128];

                snprintf(current_freq_file, 127, "%s/cpu%d/%s", CPUFREQ_PREFIX, cpu - 1,
                        CPUFREQ_POSTFIX);
                f = fopen(current_freq_file, "r");
                if (f) {
                        /* if there's a cpufreq /sys node, read the current frequency from
                         * this node and divide by 1000 to get Mhz. */
                        if (fgets(s, sizeof(s), f)) {
                                s[strlen(s) - 1] = '\0';
                                freq = strtod(s, NULL);
                        }
                        fclose(f);
                        snprintf(p_client_buffer, client_buffer_size, p_format,
                                (freq / 1000) / divisor);
                        return 1;
                }
        }

        // open the CPU information file
        f = open_file("/proc/cpuinfo", &rep);
        if (!f) {
                perror("Conky: Failed to access '/proc/cpuinfo' at get_freq()");
                return 0;
        }

        // read the file
        while (fgets(s, sizeof(s), f) != NULL) {

#if defined(__i386) || defined(__x86_64)
                // and search for the cpu mhz
                if (strncmp(s, "cpu MHz", 7) == 0 && cpu == 0) {
#else
#if defined(__alpha)
                // different on alpha
                if (strncmp(s, "cycle frequency [Hz]", 20) == 0 && cpu == 0) {
#else
                // this is different on ppc for some reason
                if (strncmp(s, "clock", 5) == 0 && cpu == 0) {
#endif // defined(__alpha)
#endif // defined(__i386) || defined(__x86_64)

                        // copy just the number
                        strcpy(frequency, strchr(s, ':') + 2);
#if defined(__alpha)
                        // strip " est.\n"
                        frequency[strlen(frequency) - 6] = '\0';
                        // kernel reports in Hz
                        freq = strtod(frequency, NULL) / 1000000;
#else
                        // strip \n
                        frequency[strlen(frequency) - 1] = '\0';
                        freq = strtod(frequency, NULL);
#endif
                        break;
                }
                if (strncmp(s, "processor", 9) == 0) {
                        cpu--;
                        continue;
                }
        }

        fclose(f);
        snprintf(p_client_buffer, client_buffer_size, p_format,
                (float) freq / divisor);
        return 1;
}

#define CPUFREQ_VOLTAGE "cpufreq/scaling_voltages"

/* /sys/devices/system/cpu/cpu0/cpufreq/scaling_voltages looks something
 * like this:
# frequency voltage
1800000 1340
1600000 1292
1400000 1100
1200000 988
1000000 1116
800000 1004
600000 988
 * Peter Tarjan (ptarjan@citromail.hu) */

/* return cpu voltage in mV (use divisor=1) or V (use divisor=1000) */
char get_voltage(char *p_client_buffer, size_t client_buffer_size,
                char *p_format, int divisor, unsigned int cpu)
{
        FILE *f;
        char s[256];
        int freq = 0;
        int voltage = 0;
        char current_freq_file[128];
        int freq_comp = 0;

        /* build the voltage file name */
        cpu--;
        snprintf(current_freq_file, 127, "%s/cpu%d/%s", CPUFREQ_PREFIX, cpu,
                CPUFREQ_POSTFIX);

        if (!p_client_buffer || client_buffer_size <= 0 || !p_format
                        || divisor <= 0) {
                return 0;
        }

        /* read the current cpu frequency from the /sys node */
        f = fopen(current_freq_file, "r");
        if (f) {
                if (fgets(s, sizeof(s), f)) {
                        s[strlen(s) - 1] = '\0';
                        freq = strtod(s, NULL);
                }
                fclose(f);
        } else {
                fprintf(stderr, "Conky: Failed to access '%s' at ", current_freq_file);
                perror("get_voltage()");
                if (f) {
                        fclose(f);
                }
                return 0;
        }

        snprintf(current_freq_file, 127, "%s/cpu%d/%s", CPUFREQ_PREFIX, cpu,
                CPUFREQ_VOLTAGE);

        /* use the current cpu frequency to find the corresponding voltage */
        f = fopen(current_freq_file, "r");

        if (f) {
                while (!feof(f)) {
                        char line[256];

                        if (fgets(line, 255, f) == NULL) {
                                break;
                        }
                        sscanf(line, "%d %d", &freq_comp, &voltage);
                        if (freq_comp == freq) {
                                break;
                        }
                }
                fclose(f);
        } else {
                fprintf(stderr, "Conky: Failed to access '%s' at ", current_freq_file);
                perror("get_voltage()");
                if (f) {
                        fclose(f);
                }
                return 0;
        }
        snprintf(p_client_buffer, client_buffer_size, p_format,
                (float) voltage / divisor);
        return 1;
}

#define ACPI_FAN_DIR "/proc/acpi/fan/"

void get_acpi_fan(char *p_client_buffer, size_t client_buffer_size)
{
        static int rep = 0;
        char buf[256];
        char buf2[256];
        FILE *fp;

        if (!p_client_buffer || client_buffer_size <= 0) {
                return;
        }

        /* yeah, slow... :/ */
        if (!get_first_file_in_a_directory(ACPI_FAN_DIR, buf, &rep)) {
                snprintf(p_client_buffer, client_buffer_size, "no fans?");
                return;
        }

        snprintf(buf2, sizeof(buf2), "%s%s/state", ACPI_FAN_DIR, buf);

        fp = open_file(buf2, &rep);
        if (!fp) {
                snprintf(p_client_buffer, client_buffer_size,
                        "can't open fan's state file");
                return;
        }
        memset(buf, 0, sizeof(buf));
        fscanf(fp, "%*s %99s", buf);
        fclose(fp);

        snprintf(p_client_buffer, client_buffer_size, "%s", buf);
}

#define ACPI_AC_ADAPTER_DIR "/proc/acpi/ac_adapter/"

void get_acpi_ac_adapter(char *p_client_buffer, size_t client_buffer_size)
{
        static int rep = 0;
        char buf[256];
        char buf2[256];
        FILE *fp;

        if (!p_client_buffer || client_buffer_size <= 0) {
                return;
        }

        /* yeah, slow... :/ */
        if (!get_first_file_in_a_directory(ACPI_AC_ADAPTER_DIR, buf, &rep)) {
                snprintf(p_client_buffer, client_buffer_size, "no ac_adapters?");
                return;
        }

        snprintf(buf2, sizeof(buf2), "%s%s/state", ACPI_AC_ADAPTER_DIR, buf);

        fp = open_file(buf2, &rep);
        if (!fp) {
                snprintf(p_client_buffer, client_buffer_size,
                        "No ac adapter found.... where is it?");
                return;
        }
        memset(buf, 0, sizeof(buf));
        fscanf(fp, "%*s %99s", buf);
        fclose(fp);

        snprintf(p_client_buffer, client_buffer_size, "%s", buf);
}

/*
/proc/acpi/thermal_zone/THRM/cooling_mode
cooling mode:            active
/proc/acpi/thermal_zone/THRM/polling_frequency
<polling disabled>
/proc/acpi/thermal_zone/THRM/state
state:                   ok
/proc/acpi/thermal_zone/THRM/temperature
temperature:             45 C
/proc/acpi/thermal_zone/THRM/trip_points
critical (S5):           73 C
passive:                 73 C: tc1=4 tc2=3 tsp=40 devices=0xcdf6e6c0
*/

#define ACPI_THERMAL_DIR "/proc/acpi/thermal_zone/"
#define ACPI_THERMAL_FORMAT "/proc/acpi/thermal_zone/%s/temperature"

int open_acpi_temperature(const char *name)
{
        char path[256];
        char buf[256];
        int fd;

        if (name == NULL || strcmp(name, "*") == 0) {
                static int rep = 0;

                if (!get_first_file_in_a_directory(ACPI_THERMAL_DIR, buf, &rep)) {
                        return -1;
                }
                name = buf;
        }

        snprintf(path, 255, ACPI_THERMAL_FORMAT, name);

        fd = open(path, O_RDONLY);
        if (fd < 0) {
                ERR("can't open '%s': %s", path, strerror(errno));
        }

        return fd;
}

static double last_acpi_temp;
static double last_acpi_temp_time;

double get_acpi_temperature(int fd)
{
        if (fd <= 0) {
                return 0;
        }

        /* don't update acpi temperature too often */
        if (current_update_time - last_acpi_temp_time < 11.32) {
                return last_acpi_temp;
        }
        last_acpi_temp_time = current_update_time;

        /* seek to beginning */
        lseek(fd, 0, SEEK_SET);

        /* read */
        {
                char buf[256];
                int n;

                n = read(fd, buf, 255);
                if (n < 0) {
                        ERR("can't read fd %d: %s", fd, strerror(errno));
                } else {
                        buf[n] = '\0';
                        sscanf(buf, "temperature: %lf", &last_acpi_temp);
                }
        }

        return last_acpi_temp;
}

/*
hipo@lepakko hipo $ cat /proc/acpi/battery/BAT1/info
present:                 yes
design capacity:         4400 mAh
last full capacity:      4064 mAh
battery technology:      rechargeable
design voltage:          14800 mV
design capacity warning: 300 mAh
design capacity low:     200 mAh
capacity granularity 1:  32 mAh
capacity granularity 2:  32 mAh
model number:            02KT
serial number:           16922
battery type:            LION
OEM info:                SANYO
*/

/*
hipo@lepakko conky $ cat /proc/acpi/battery/BAT1/state
present:                 yes
capacity state:          ok
charging state:          unknown
present rate:            0 mA
remaining capacity:      4064 mAh
present voltage:         16608 mV
*/

/*
2213<@jupet�kellari��> jupet@lagi-unstable:~$ cat /proc/apm
2213<@jupet�kellari��> 1.16 1.2 0x03 0x01 0xff 0x10 -1% -1 ?
2213<@jupet�kellari��> (-1 ollee ei akkua kiinni, koska akku on p�yd�ll�)
2214<@jupet�kellari��> jupet@lagi-unstable:~$ cat /proc/apm
2214<@jupet�kellari��> 1.16 1.2 0x03 0x01 0x03 0x09 98% -1 ?

2238<@jupet�kellari��> 1.16 1.2 0x03 0x00 0x00 0x01 100% -1 ? ilman verkkovirtaa
2239<@jupet�kellari��> 1.16 1.2 0x03 0x01 0x00 0x01 99% -1 ? verkkovirralla

2240<@jupet�kellari��> 1.16 1.2 0x03 0x01 0x03 0x09 100% -1 ? verkkovirralla ja monitori p��ll�
2241<@jupet�kellari��> 1.16 1.2 0x03 0x00 0x00 0x01 99% -1 ? monitori p��ll� mutta ilman verkkovirtaa
*/

/* Kapil Hari Paranjape <kapil@imsc.res.in>
  Linux 2.6.24 onwards battery info is in
  /sys/class/power_supply/BAT0/
  On my system I get the following.
        /sys/class/power_supply/BAT0/uevent:
        PHYSDEVPATH=/devices/LNXSYSTM:00/device:00/PNP0A03:00/device:01/PNP0C09:00/PNP0C0A:00
        PHYSDEVBUS=acpi
        PHYSDEVDRIVER=battery
        POWER_SUPPLY_NAME=BAT0
        POWER_SUPPLY_TYPE=Battery
        POWER_SUPPLY_STATUS=Discharging
        POWER_SUPPLY_PRESENT=1
        POWER_SUPPLY_TECHNOLOGY=Li-ion
        POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000
        POWER_SUPPLY_VOLTAGE_NOW=10780000
        POWER_SUPPLY_CURRENT_NOW=13970000
        POWER_SUPPLY_ENERGY_FULL_DESIGN=47510000
        POWER_SUPPLY_ENERGY_FULL=27370000
        POWER_SUPPLY_ENERGY_NOW=11810000
        POWER_SUPPLY_MODEL_NAME=IBM-92P1060
        POWER_SUPPLY_MANUFACTURER=Panasonic
  On some systems POWER_SUPPLY_ENERGY_* is replaced by POWER_SUPPLY_CHARGE_*
*/

#define SYSFS_BATTERY_BASE_PATH "/sys/class/power_supply"
#define ACPI_BATTERY_BASE_PATH "/proc/acpi/battery"
#define APM_PATH "/proc/apm"
#define MAX_BATTERY_COUNT 4

static FILE *sysfs_bat_fp[MAX_BATTERY_COUNT];
static FILE *acpi_bat_fp[MAX_BATTERY_COUNT];
static FILE *apm_bat_fp[MAX_BATTERY_COUNT];

static int batteries_initialized = 0;
static char batteries[MAX_BATTERY_COUNT][32];

static int acpi_last_full[MAX_BATTERY_COUNT];
static int acpi_design_capacity[MAX_BATTERY_COUNT];

/* e.g. "charging 75%" */
static char last_battery_str[MAX_BATTERY_COUNT][64];
/* e.g. "3h 15m" */
static char last_battery_time_str[MAX_BATTERY_COUNT][64];

static double last_battery_time[MAX_BATTERY_COUNT];

static int last_battery_perct[MAX_BATTERY_COUNT];
static double last_battery_perct_time[MAX_BATTERY_COUNT];

void init_batteries(void)
{
        int idx;

        if (batteries_initialized) {
                return;
        }
        for (idx = 0; idx < MAX_BATTERY_COUNT; idx++) {
                batteries[idx][0] = '\0';
        }
        batteries_initialized = 1;
}

int get_battery_idx(const char *bat)
{
        int idx;

        for (idx = 0; idx < MAX_BATTERY_COUNT; idx++) {
                if (!strlen(batteries[idx]) || !strcmp(batteries[idx], bat)) {
                        break;
                }
        }

        /* if not found, enter a new entry */
        if (!strlen(batteries[idx])) {
                snprintf(batteries[idx], 31, "%s", bat);
        }

        return idx;
}

void get_battery_stuff(char *buf, unsigned int n, const char *bat, int item)
{
        static int idx, rep = 0, rep2 = 0;
        char acpi_path[128];

        snprintf(acpi_path, 127, ACPI_BATTERY_BASE_PATH "/%s/state", bat);
        char sysfs_path[128];
        snprintf(sysfs_path, 127, SYSFS_BATTERY_BASE_PATH "/%s/uevent", bat);

        init_batteries();

        idx = get_battery_idx(bat);

        /* don't update battery too often */
        if (current_update_time - last_battery_time[idx] < 29.5) {
                goto set_return_value;
        }

        last_battery_time[idx] = current_update_time;

        memset(last_battery_str[idx], 0, sizeof(last_battery_str[idx]));
        memset(last_battery_time_str[idx], 0, sizeof(last_battery_time_str[idx]));

        /* first try SYSFS if that fails try ACPI */
 
        if (sysfs_bat_fp[idx] == NULL && acpi_bat_fp[idx] == NULL && apm_bat_fp[idx] == NULL)
                sysfs_bat_fp[idx] = open_file(sysfs_path, &rep);
  
        if (sysfs_bat_fp[idx] == NULL && acpi_bat_fp[idx] == NULL && apm_bat_fp[idx] == NULL)
                acpi_bat_fp[idx] = open_file(acpi_path, &rep);
  
        if (sysfs_bat_fp[idx] != NULL) {
                /* SYSFS */
                int present_rate = -1;
                int remaining_capacity = -1;
                char charging_state[64];
                char present[4];
 
                strcpy(charging_state, "Unknown");
 
                while (!feof(sysfs_bat_fp[idx])) {
                        char buf[256];
                        if (fgets(buf, 256, sysfs_bat_fp[idx]) == NULL)
                                break;
 
                        /* let's just hope units are ok */
                        if (strncmp (buf, "POWER_SUPPLY_PRESENT=1", 22) == 0)
                                strcpy(present, "Yes");
                        else if (strncmp (buf, "POWER_SUPPLY_PRESENT=0", 22) == 0)
                                strcpy(present, "No");
                        else if (strncmp (buf, "POWER_SUPPLY_STATUS=", 20) == 0)
                                sscanf(buf, "POWER_SUPPLY_STATUS=%63s", charging_state);
                        /* present_rate is not the same as the
                        current flowing now but it is the same value
                        which was used in the past. so we continue
                        the tradition! */
                        else if (strncmp(buf, "POWER_SUPPLY_CURRENT_NOW=", 25) == 0)
                                sscanf(buf, "POWER_SUPPLY_CURRENT_NOW=%d", &present_rate);
                        else if (strncmp(buf, "POWER_SUPPLY_ENERGY_NOW=", 24) == 0)
                                sscanf(buf, "POWER_SUPPLY_ENERGY_NOW=%d", &remaining_capacity);
                        else if (strncmp(buf, "POWER_SUPPLY_ENERGY_FULL=", 25) == 0)
                                sscanf(buf, "POWER_SUPPLY_ENERGY_FULL=%d", &acpi_last_full[idx]);
                        else if (strncmp(buf, "POWER_SUPPLY_CHARGE_NOW=", 24) == 0)
                                sscanf(buf, "POWER_SUPPLY_CHARGE_NOW=%d", &remaining_capacity);
                        else if (strncmp(buf, "POWER_SUPPLY_CHARGE_FULL=", 25) == 0)
                                sscanf(buf, "POWER_SUPPLY_CHARGE_FULL=%d", &acpi_last_full[idx]);
                }
 
                fclose(sysfs_bat_fp[idx]);
                sysfs_bat_fp[idx] = NULL;
 
                /* Hellf[i]re notes that remaining capacity can exceed acpi_last_full */
                if (remaining_capacity > acpi_last_full[idx])
                        acpi_last_full[idx] = remaining_capacity;  /* normalize to 100% */
 
                /* not present */
                if (strcmp(present, "No") == 0) {
                        strncpy(last_battery_str[idx], "not present", 64);
                }
                /* charging */
                else if (strcmp(charging_state, "Charging") == 0) {
                        if (acpi_last_full[idx] != 0 && present_rate > 0) {
                                /* e.g. charging 75% */
                                snprintf(last_battery_str[idx], sizeof(last_battery_str[idx])-1, "Charging %i%%",
                                        (int) (((float) remaining_capacity / acpi_last_full[idx]) * 100 ));
                                /* e.g. 2h 37m */
                                format_seconds(last_battery_time_str[idx], sizeof(last_battery_time_str[idx])-1,
                                              (long) (((float)(acpi_last_full[idx] - remaining_capacity) / present_rate) * 3600));
                        } else if (acpi_last_full[idx] != 0 && present_rate <= 0) {
                                snprintf(last_battery_str[idx], sizeof(last_battery_str[idx])-1, "Charging %d%%",
                                        (int) (((float)remaining_capacity / acpi_last_full[idx]) * 100));
                        } else {
                                strncpy(last_battery_str[idx], "Charging", sizeof(last_battery_str[idx])-1);
                        }
                }
                /* discharging */
                else if (strncmp(charging_state, "Discharging", 64) == 0) {
                        if (present_rate > 0) {
                                /* e.g. discharging 35% */
                                snprintf(last_battery_str[idx], sizeof(last_battery_str[idx])-1, "Discharging %i%%",
                                        (int) (((float) remaining_capacity / acpi_last_full[idx]) * 100 ));
                                /* e.g. 1h 12m */
                                format_seconds(last_battery_time_str[idx], sizeof(last_battery_time_str[idx])-1,
                                              (long) (((float)(acpi_last_full[idx] - remaining_capacity) / present_rate) * 3600));
                        } else if (present_rate == 0) { /* Thanks to Nexox for this one */
                                snprintf(last_battery_str[idx], sizeof(last_battery_str[idx])-1, "Full");
                        } else {
                                snprintf(last_battery_str[idx], sizeof(last_battery_str[idx])-1,
                                        "Discharging %d%%",
                                        (int) (((float)remaining_capacity / acpi_last_full[idx]) * 100));
                        }
                }
                /* charged */
                /* thanks to Lukas Zapletal <lzap@seznam.cz> */
                else if (strncmp(charging_state, "Charged", 64) == 0) {
                                /* Below happens with the second battery on my X40,
                                 * when the second one is empty and the first one
                                 * being charged. */
                                if (remaining_capacity == 0)
                                        strcpy(last_battery_str[idx], "Empty");
                                else
                                        strcpy(last_battery_str[idx], "Charged");
                }
                /* unknown, probably full / AC */
                else {
                        if (acpi_last_full[idx] != 0
                            && remaining_capacity != acpi_last_full[idx])
                                snprintf(last_battery_str[idx], 64, "Unknown %d%%",
                                        (int) (((float)remaining_capacity / acpi_last_full[idx]) * 100));
                        else
                                strncpy(last_battery_str[idx], "AC", 64);
                }
        } else if (acpi_bat_fp[idx] != NULL) {
                /* ACPI */
                int present_rate = -1;
                int remaining_capacity = -1;
                char charging_state[64];
                char present[4];

                /* read last full capacity if it's zero */
                if (acpi_last_full[idx] == 0) {
                        static int rep = 0;
                        char path[128];
                        FILE *fp;

                        snprintf(path, 127, ACPI_BATTERY_BASE_PATH "/%s/info", bat);
                        fp = open_file(path, &rep);
                        if (fp != NULL) {
                                while (!feof(fp)) {
                                        char b[256];

                                        if (fgets(b, 256, fp) == NULL) {
                                                break;
                                        }
                                        if (sscanf(b, "last full capacity: %d",
                                                        &acpi_last_full[idx]) != 0) {
                                                break;
                                        }
                                }

                                fclose(fp);
                        }
                }

                fseek(acpi_bat_fp[idx], 0, SEEK_SET);

                strcpy(charging_state, "unknown");

                while (!feof(acpi_bat_fp[idx])) {
                        char buf[256];

                        if (fgets(buf, 256, acpi_bat_fp[idx]) == NULL) {
                                break;
                        }

                        /* let's just hope units are ok */
                        if (strncmp(buf, "present:", 8) == 0) {
                                sscanf(buf, "present: %4s", present);
                        } else if (strncmp(buf, "charging state:", 15) == 0) {
                                sscanf(buf, "charging state: %63s", charging_state);
                        } else if (strncmp(buf, "present rate:", 13) == 0) {
                                sscanf(buf, "present rate: %d", &present_rate);
                        } else if (strncmp(buf, "remaining capacity:", 19) == 0) {
                                sscanf(buf, "remaining capacity: %d", &remaining_capacity);
                        }
                }
                /* Hellf[i]re notes that remaining capacity can exceed acpi_last_full */
                if (remaining_capacity > acpi_last_full[idx]) {
                        /* normalize to 100% */
                        acpi_last_full[idx] = remaining_capacity;
                }

                /* not present */
                if (strcmp(present, "no") == 0) {
                        strncpy(last_battery_str[idx], "not present", 64);
                /* charging */
                } else if (strcmp(charging_state, "charging") == 0) {
                        if (acpi_last_full[idx] != 0 && present_rate > 0) {
                                /* e.g. charging 75% */
                                snprintf(last_battery_str[idx],
                                        sizeof(last_battery_str[idx]) - 1, "charging %i%%",
                                        (int) ((remaining_capacity * 100) / acpi_last_full[idx]));
                                /* e.g. 2h 37m */
                                format_seconds(last_battery_time_str[idx],
                                        sizeof(last_battery_time_str[idx]) - 1,
                                        (long) (((acpi_last_full[idx] - remaining_capacity) *
                                        3600) / present_rate));
                        } else if (acpi_last_full[idx] != 0 && present_rate <= 0) {
                                snprintf(last_battery_str[idx],
                                        sizeof(last_battery_str[idx]) - 1, "charging %d%%",
                                        (int) ((remaining_capacity * 100) / acpi_last_full[idx]));
                        } else {
                                strncpy(last_battery_str[idx], "charging",
                                        sizeof(last_battery_str[idx]) - 1);
                        }
                /* discharging */
                } else if (strncmp(charging_state, "discharging", 64) == 0) {
                        if (present_rate > 0) {
                                /* e.g. discharging 35% */
                                snprintf(last_battery_str[idx],
                                        sizeof(last_battery_str[idx]) - 1, "discharging %i%%",
                                        (int) ((remaining_capacity * 100) / acpi_last_full[idx]));
                                /* e.g. 1h 12m */
                                format_seconds(last_battery_time_str[idx],
                                        sizeof(last_battery_time_str[idx]) - 1,
                                        (long) ((remaining_capacity * 3600) / present_rate));
                        } else if (present_rate == 0) { /* Thanks to Nexox for this one */
                                snprintf(last_battery_str[idx],
                                        sizeof(last_battery_str[idx]) - 1, "full");
                        } else {
                                snprintf(last_battery_str[idx],
                                        sizeof(last_battery_str[idx]) - 1, "discharging %d%%",
                                        (int) ((remaining_capacity * 100) / acpi_last_full[idx]));
                        }
                /* charged */
                } else if (strncmp(charging_state, "charged", 64) == 0) {
                        /* thanks to Lukas Zapletal <lzap@seznam.cz> */
                        /* Below happens with the second battery on my X40,
                         * when the second one is empty and the first one being charged. */
                        if (remaining_capacity == 0) {
                                strcpy(last_battery_str[idx], "empty");
                        } else {
                                strcpy(last_battery_str[idx], "charged");
                        }
                /* unknown, probably full / AC */
                } else {
                        if (acpi_last_full[idx] != 0
                                        && remaining_capacity != acpi_last_full[idx]) {
                                snprintf(last_battery_str[idx], 64, "unknown %d%%",
                                        (int) ((remaining_capacity * 100) / acpi_last_full[idx]));
                        } else {
                                strncpy(last_battery_str[idx], "AC", 64);
                        }
                }
        } else {
                /* APM */
                if (apm_bat_fp[idx] == NULL) {
                        apm_bat_fp[idx] = open_file(APM_PATH, &rep2);
                }

                if (apm_bat_fp[idx] != NULL) {
                        int ac, status, flag, life;

                        fscanf(apm_bat_fp[idx], "%*s %*s %*x %x   %x       %x     %d%%",
                                &ac, &status, &flag, &life);

                        if (life == -1) {
                                /* could check now that there is ac */
                                snprintf(last_battery_str[idx], 64, "AC");

                        /* could check that status == 3 here? */
                        } else if (ac && life != 100) {
                                snprintf(last_battery_str[idx], 64, "charging %d%%", life);
                        } else {
                                snprintf(last_battery_str[idx], 64, "%d%%", life);
                        }

                        /* it seemed to buffer it so file must be closed (or could use
                         * syscalls directly but I don't feel like coding it now) */
                        fclose(apm_bat_fp[idx]);
                        apm_bat_fp[idx] = NULL;
                }
        }

set_return_value:
        switch (item) {
                case BATTERY_STATUS:
                        snprintf(buf, n, "%s", last_battery_str[idx]);
                        break;
                case BATTERY_TIME:
                        snprintf(buf, n, "%s", last_battery_time_str[idx]);
                        break;
                default:
                        break;
        }
}

int get_battery_perct(const char *bat)
{
        static int rep;
        int idx;
        char acpi_path[128];

        snprintf(acpi_path, 127, ACPI_BATTERY_BASE_PATH "/%s/state", bat);
        char sysfs_path[128];
        snprintf(sysfs_path, 127, SYSFS_BATTERY_BASE_PATH "/%s/uevent", bat);

        init_batteries();

        idx = get_battery_idx(bat);

        /* don't update battery too often */
        if (current_update_time - last_battery_perct_time[idx] < 30) {
                return last_battery_perct[idx];
        }
        last_battery_perct_time[idx] = current_update_time;

        /* Only check for SYSFS or ACPI */

        if (sysfs_bat_fp[idx] == NULL && acpi_bat_fp[idx] == NULL && apm_bat_fp[idx] == NULL)
                sysfs_bat_fp[idx] = open_file(sysfs_path, &rep);

        if (sysfs_bat_fp[idx] == NULL && acpi_bat_fp[idx] == NULL && apm_bat_fp[idx] == NULL)
                acpi_bat_fp[idx] = open_file(acpi_path, &rep);

        int remaining_capacity = -1;

        if (sysfs_bat_fp[idx] != NULL) {
                /* SYSFS */
                while (!feof(sysfs_bat_fp[idx])) {
                        char buf[256];
                        if (fgets(buf, 256, sysfs_bat_fp[idx]) == NULL)
                                break;

                        if (strncmp(buf, "POWER_SUPPLY_CHARGE_NOW=", 24) == 0)
                                sscanf(buf, "POWER_SUPPLY_CHARGE_NOW=%d", &remaining_capacity);
                        else if (strncmp(buf, "POWER_SUPPLY_CHARGE_FULL=",25) != 0)
                                sscanf(buf, "POWER_SUPPLY_CHARGE_FULL=%d", &acpi_last_full[idx]);
                        else if (strncmp(buf, "POWER_SUPPLY_ENERGY_NOW=", 24) == 0)
                                sscanf(buf, "POWER_SUPPLY_ENERGY_NOW=%d", &remaining_capacity);
                        else if (strncmp(buf, "POWER_SUPPLY_ENERGY_FULL=",25) != 0)
                                sscanf(buf, "POWER_SUPPLY_ENERGY_FULL=%d", &acpi_last_full[idx]);
                }

                fclose(sysfs_bat_fp[idx]);
                sysfs_bat_fp[idx] = NULL;

        } else if (acpi_bat_fp[idx] != NULL) {
                /* ACPI */
                /* read last full capacity if it's zero */
                if (acpi_design_capacity[idx] == 0) {
                        static int rep;
                        char path[128];
                        FILE *fp;

                        snprintf(path, 127, ACPI_BATTERY_BASE_PATH "/%s/info", bat);
                        fp = open_file(path, &rep);
                        if (fp != NULL) {
                                while (!feof(fp)) {
                                        char b[256];

                                        if (fgets(b, 256, fp) == NULL) {
                                                break;
                                        }
                                        if (sscanf(b, "last full capacity: %d",
                                                                &acpi_design_capacity[idx]) != 0) {
                                                break;
                                        }
                                }
                                fclose(fp);
                        }
                }

                fseek(acpi_bat_fp[idx], 0, SEEK_SET);

                while (!feof(acpi_bat_fp[idx])) {
                        char buf[256];

                        if (fgets(buf, 256, acpi_bat_fp[idx]) == NULL) {
                                break;
                        }

                        if (buf[0] == 'r') {
                                sscanf(buf, "remaining capacity: %d", &remaining_capacity);
                        }
                }
        }
        if (remaining_capacity < 0) {
                return 0;
        }
        /* compute the battery percentage */
        last_battery_perct[idx] =
                (int) (((float) remaining_capacity / acpi_design_capacity[idx]) * 100);
        return last_battery_perct[idx];
}

int get_battery_perct_bar(const char *bar)
{
        int idx;

        get_battery_perct(bar);
        idx = get_battery_idx(bar);
        return (int) (last_battery_perct[idx] * 2.56 - 1);
}

/* On Apple powerbook and ibook:
$ cat /proc/pmu/battery_0
flags      : 00000013
charge     : 3623
max_charge : 3720
current    : 388
voltage    : 16787
time rem.  : 900
$ cat /proc/pmu/info
PMU driver version     : 2
PMU firmware version   : 0c
AC Power               : 1
Battery count          : 1
*/

/* defines as in <linux/pmu.h> */
#define PMU_BATT_PRESENT                0x00000001
#define PMU_BATT_CHARGING               0x00000002

static FILE *pmu_battery_fp;
static FILE *pmu_info_fp;
static char pb_battery_info[3][32];
static double pb_battery_info_update;

#define PMU_PATH "/proc/pmu"
void get_powerbook_batt_info(char *buf, size_t n, int i)
{
        static int rep = 0;
        const char *batt_path = PMU_PATH "/battery_0";
        const char *info_path = PMU_PATH "/info";
        int flags, charge, max_charge, ac = -1;
        long time = -1;

        /* don't update battery too often */
        if (current_update_time - pb_battery_info_update < 29.5) {
                snprintf(buf, n, "%s", pb_battery_info[i]);
                return;
        }
        pb_battery_info_update = current_update_time;

        if (pmu_battery_fp == NULL) {
                pmu_battery_fp = open_file(batt_path, &rep);
        }

        if (pmu_battery_fp != NULL) {
                rewind(pmu_battery_fp);
                while (!feof(pmu_battery_fp)) {
                        char buf[32];

                        if (fgets(buf, sizeof(buf), pmu_battery_fp) == NULL) {
                                break;
                        }

                        if (buf[0] == 'f') {
                                sscanf(buf, "flags      : %8x", &flags);
                        } else if (buf[0] == 'c' && buf[1] == 'h') {
                                sscanf(buf, "charge     : %d", &charge);
                        } else if (buf[0] == 'm') {
                                sscanf(buf, "max_charge : %d", &max_charge);
                        } else if (buf[0] == 't') {
                                sscanf(buf, "time rem.  : %ld", &time);
                        }
                }
        }
        if (pmu_info_fp == NULL) {
                pmu_info_fp = open_file(info_path, &rep);
        }

        if (pmu_info_fp != NULL) {
                rewind(pmu_info_fp);
                while (!feof(pmu_info_fp)) {
                        char buf[32];

                        if (fgets(buf, sizeof(buf), pmu_info_fp) == NULL) {
                                break;
                        }
                        if (buf[0] == 'A') {
                                sscanf(buf, "AC Power               : %d", &ac);
                        }
                }
        }
        /* update status string */
        if ((ac && !(flags & PMU_BATT_PRESENT))) {
                strcpy(pb_battery_info[PB_BATT_STATUS], "AC");
        } else if (ac && (flags & PMU_BATT_PRESENT)
                        && !(flags & PMU_BATT_CHARGING)) {
                strcpy(pb_battery_info[PB_BATT_STATUS], "charged");
        } else if ((flags & PMU_BATT_PRESENT) && (flags & PMU_BATT_CHARGING)) {
                strcpy(pb_battery_info[PB_BATT_STATUS], "charging");
        } else {
                strcpy(pb_battery_info[PB_BATT_STATUS], "discharging");
        }

        /* update percentage string */
        if (time == 0) {
                pb_battery_info[PB_BATT_PERCENT][0] = 0;
        } else {
                snprintf(pb_battery_info[PB_BATT_PERCENT],
                        sizeof(pb_battery_info[PB_BATT_PERCENT]), "%d%%",
                        (charge * 100) / max_charge);
        }

        /* update time string */
        if (time == 0) {                        /* fully charged or battery not present */
                pb_battery_info[PB_BATT_TIME][0] = 0;
        } else if (time < 60 * 60) {    /* don't show secs */
                format_seconds_short(pb_battery_info[PB_BATT_TIME],
                        sizeof(pb_battery_info[PB_BATT_TIME]), time);
        } else {
                format_seconds(pb_battery_info[PB_BATT_TIME],
                        sizeof(pb_battery_info[PB_BATT_TIME]), time);
        }

        snprintf(buf, n, "%s", pb_battery_info[i]);
}

void update_top()
{
        show_nice_processes = 1;
        process_find_top(info.cpu, info.memu);
        info.first_process = get_first_process();
}

/* The following ifdefs were adapted from gkrellm */
#include <linux/major.h>

#if !defined(MD_MAJOR)
#define MD_MAJOR 9
#endif

#if !defined(LVM_BLK_MAJOR)
#define LVM_BLK_MAJOR 58
#endif

#if !defined(NBD_MAJOR)
#define NBD_MAJOR 43
#endif

void update_diskio()
{
        static unsigned int last = UINT_MAX;
        static unsigned int last_read = UINT_MAX;
        static unsigned int last_write = UINT_MAX;
        FILE *fp;
        static int rep = 0;

        char buf[512], devbuf[64];
        int major, minor, i;
        unsigned int current = 0;
        unsigned int current_read = 0;
        unsigned int current_write = 0;
        unsigned int reads, writes = 0;
        int col_count = 0;

        if (!(fp = open_file("/proc/diskstats", &rep))) {
                diskio_value = 0;
                return;
        }

        /* read reads and writes from all disks (minor = 0), including cd-roms
         * and floppies, and sum them up */
        while (!feof(fp)) {
                fgets(buf, 512, fp);
                col_count = sscanf(buf, "%u %u %s %*u %*u %u %*u %*u %*u %u", &major,
                        &minor, devbuf, &reads, &writes);
                /* ignore subdevices (they have only 3 matching entries in their line)
                 * and virtual devices (LVM, network block devices, RAM disks, Loopback)
                 *
                 * XXX: ignore devices which are part of a SW RAID (MD_MAJOR) */
                if (col_count == 5 && major != LVM_BLK_MAJOR && major != NBD_MAJOR
                                && major != RAMDISK_MAJOR && major != LOOP_MAJOR) {
                        current += reads + writes;
                        current_read += reads;
                        current_write += writes;
                } else {
                        col_count = sscanf(buf, "%u %u %s %*u %u %*u %u",
                                &major, &minor, devbuf, &reads, &writes);
                        if (col_count != 5) {
                                continue;
                        }
                }
                for (i = 0; i < MAX_DISKIO_STATS; i++) {
                        if (diskio_stats[i].dev &&
                                        strcmp(devbuf, diskio_stats[i].dev) == 0) {
                                diskio_stats[i].current =
                                        (reads + writes - diskio_stats[i].last) / 2;
                                diskio_stats[i].current_read =
                                        (reads - diskio_stats[i].last_read) / 2;
                                diskio_stats[i].current_write =
                                        (writes - diskio_stats[i].last_write) / 2;
                                if (reads + writes < diskio_stats[i].last) {
                                        diskio_stats[i].current = 0;
                                }
                                if (reads < diskio_stats[i].last_read) {
                                        diskio_stats[i].current_read = 0;
                                        diskio_stats[i].current = diskio_stats[i].current_write;
                                }
                                if (writes < diskio_stats[i].last_write) {
                                        diskio_stats[i].current_write = 0;
                                        diskio_stats[i].current = diskio_stats[i].current_read;
                                }
                                diskio_stats[i].last = reads + writes;
                                diskio_stats[i].last_read = reads;
                                diskio_stats[i].last_write = writes;
                        }
                }
        }

        /* since the values in /proc/diststats are absolute, we have to substract
         * our last reading. The numbers stand for "sectors read", and we therefore
         * have to divide by two to get KB */
        int tot = ((double) (current - last) / 2);
        int tot_read = ((double) (current_read - last_read) / 2);
        int tot_write = ((double) (current_write - last_write) / 2);

        if (last_read > current_read) {
                tot_read = 0;
        }
        if (last_write > current_write) {
                tot_write = 0;
        }

        if (last > current) {
                /* we hit this either if it's the very first time we run this, or
                 * when /proc/diskstats overflows; while 0 is not correct, it's at
                 * least not way off */
                tot = 0;
        }
        last = current;
        last_read = current_read;
        last_write = current_write;

        diskio_value = tot;
        diskio_read_value = tot_read;
        diskio_write_value = tot_write;

        fclose(fp);
}

/* Here come the IBM ACPI-specific things. For reference, see
 * http://ibm-acpi.sourceforge.net/README
 * If IBM ACPI is installed, /proc/acpi/ibm contains the following files:
bay
beep
bluetooth
brightness
cmos
dock
driver
ecdump
fan
hotkey
led
light
thermal
video
volume
 * The content of these files is described in detail in the aforementioned
 * README - some of them also in the following functions accessing them.
 * Peter Tarjan (ptarjan@citromail.hu) */

#define IBM_ACPI_DIR "/proc/acpi/ibm"

/* get fan speed on IBM/Lenovo laptops running the ibm acpi.
 * /proc/acpi/ibm/fan looks like this (3 lines):
status:         disabled
speed:          2944
commands:       enable, disable
 * Peter Tarjan (ptarjan@citromail.hu) */

void get_ibm_acpi_fan(char *p_client_buffer, size_t client_buffer_size)
{
        if (!p_client_buffer || client_buffer_size <= 0) {
                return;
        }

        FILE *fp;
        unsigned int speed = 0;
        char fan[128];

        snprintf(fan, 127, "%s/fan", IBM_ACPI_DIR);

        fp = fopen(fan, "r");
        if (fp != NULL) {
                while (!feof(fp)) {
                        char line[256];

                        if (fgets(line, 255, fp) == NULL) {
                                break;
                        }
                        if (sscanf(line, "speed: %d", &speed)) {
                                break;
                        }
                }
        } else {
                CRIT_ERR("can't open '%s': %s\nYou are not using the IBM ACPI. Remove "
                        "ibm* from your Conky config file.", fan, strerror(errno));
        }

        fclose(fp);
        snprintf(p_client_buffer, client_buffer_size, "%d", speed);
}

/* get the measured temperatures from the temperature sensors
 * on IBM/Lenovo laptops running the ibm acpi.
 * There are 8 values in /proc/acpi/ibm/thermal, and according to
 * http://ibm-acpi.sourceforge.net/README
 * these mean the following (at least on an IBM R51...)
 * 0:  CPU (also on the T series laptops)
 * 1:  Mini PCI Module (?)
 * 2:  HDD (?)
 * 3:  GPU (also on the T series laptops)
 * 4:  Battery (?)
 * 5:  N/A
 * 6:  Battery (?)
 * 7:  N/A
 * I'm not too sure about those with the question mark, but the values I'm
 * reading from *my* thermal file (on a T42p) look realistic for the
 * hdd and the battery.
 * #5 and #7 are always -128.
 * /proc/acpi/ibm/thermal looks like this (1 line):
temperatures:   41 43 31 46 33 -128 29 -128
 * Peter Tarjan (ptarjan@citromail.hu) */

static double last_ibm_acpi_temp_time;
void get_ibm_acpi_temps()
{

        /* don't update too often */
        if (current_update_time - last_ibm_acpi_temp_time < 10.00) {
                return;
        }
        last_ibm_acpi_temp_time = current_update_time;

        /* if (!p_client_buffer || client_buffer_size <= 0) {
                return;
        } */

        FILE *fp;

        char thermal[128];

        snprintf(thermal, 127, "%s/thermal", IBM_ACPI_DIR);
        fp = fopen(thermal, "r");

        if (fp != NULL) {
                while (!feof(fp)) {
                        char line[256];

                        if (fgets(line, 255, fp) == NULL) {
                                break;
                        }
                        if (sscanf(line, "temperatures: %d %d %d %d %d %d %d %d",
                                        &ibm_acpi.temps[0], &ibm_acpi.temps[1], &ibm_acpi.temps[2],
                                        &ibm_acpi.temps[3], &ibm_acpi.temps[4], &ibm_acpi.temps[5],
                                        &ibm_acpi.temps[6], &ibm_acpi.temps[7])) {
                                break;
                        }
                }
        } else {
                CRIT_ERR("can't open '%s': %s\nYou are not using the IBM ACPI. Remove "
                        "ibm* from your Conky config file.", thermal, strerror(errno));
        }

        fclose(fp);
}

/* get volume (0-14) on IBM/Lenovo laptops running the ibm acpi.
 * "Volume" here is none of the mixer volumes, but a "master of masters"
 * volume adjusted by the IBM volume keys.
 * /proc/acpi/ibm/fan looks like this (4 lines):
level:          4
mute:           off
commands:       up, down, mute
commands:       level <level> (<level> is 0-15)
 * Peter Tarjan (ptarjan@citromail.hu) */

void get_ibm_acpi_volume(char *p_client_buffer, size_t client_buffer_size)
{
        if (!p_client_buffer || client_buffer_size <= 0) {
                return;
        }

        FILE *fp;

        char volume[128];

        snprintf(volume, 127, "%s/volume", IBM_ACPI_DIR);
        unsigned int vol = -1;
        char mute[3] = "";

        fp = fopen(volume, "r");
        if (fp != NULL) {
                while (!feof(fp)) {
                        char line[256];
                        unsigned int read_vol = -1;

                        if (fgets(line, 255, fp) == NULL) {
                                break;
                        }
                        if (sscanf(line, "level: %d", &read_vol)) {
                                vol = read_vol;
                                continue;
                        }
                        if (sscanf(line, "mute: %s", mute)) {
                                break;
                        }
                }
        } else {
                CRIT_ERR("can't open '%s': %s\nYou are not using the IBM ACPI. Remove "
                        "ibm* from your Conky config file.", volume, strerror(errno));
        }

        fclose(fp);

        if (strcmp(mute, "on") == 0) {
                snprintf(p_client_buffer, client_buffer_size, "%s", "mute");
                return;
        } else {
                snprintf(p_client_buffer, client_buffer_size, "%d", vol);
                return;
        }
}

/* static FILE *fp = NULL; */

/* get LCD brightness on IBM/Lenovo laptops running the ibm acpi.
 * /proc/acpi/ibm/brightness looks like this (3 lines):
level:          7
commands:       up, down
commands:       level <level> (<level> is 0-7)
 * Peter Tarjan (ptarjan@citromail.hu) */

void get_ibm_acpi_brightness(char *p_client_buffer, size_t client_buffer_size)
{
        if (!p_client_buffer || client_buffer_size <= 0) {
                return;
        }

        FILE *fp;
        unsigned int brightness = 0;
        char filename[128];

        snprintf(filename, 127, "%s/brightness", IBM_ACPI_DIR);

        fp = fopen(filename, "r");
        if (fp != NULL) {
                while (!feof(fp)) {
                        char line[256];

                        if (fgets(line, 255, fp) == NULL) {
                                break;
                        }
                        if (sscanf(line, "level: %d", &brightness)) {
                                break;
                        }
                }
        } else {
                CRIT_ERR("can't open '%s': %s\nYou are not using the IBM ACPI. Remove "
                        "ibm* from your Conky config file.", filename, strerror(errno));
        }

        fclose(fp);

        snprintf(p_client_buffer, client_buffer_size, "%d", brightness);
}

void update_entropy(void)
{
        static int rep = 0;
        const char *entropy_avail = "/proc/sys/kernel/random/entropy_avail";
        const char *entropy_poolsize = "/proc/sys/kernel/random/poolsize";
        FILE *fp1, *fp2;

        info.entropy.entropy_avail = 0;
        info.entropy.poolsize = 0;

        if ((fp1 = open_file(entropy_avail, &rep)) == NULL) {
                return;
        }

        if ((fp2 = open_file(entropy_poolsize, &rep)) == NULL) {
                fclose(fp1);
                return;
        }

        fscanf(fp1, "%u", &info.entropy.entropy_avail);
        fscanf(fp2, "%u", &info.entropy.poolsize);

        fclose(fp1);
        fclose(fp2);

        info.mask |= (1 << INFO_ENTROPY);
}