conky/src/linux.c

/* linux.c
 * Contains linux specific code
 *
 *  $Id$
 */


#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>
#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>

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

#ifdef HAVE_LIBDEXTER
/* need the procraw service from the libdexter dxt-sysinfo plugin */
#include <dxt-sysinfo/procraw-public.h>
#define PROCRAW_SERVICE_UUID "ce975a10-0e52-458a-a4b9-253734760436"
/* timed sampler that delivers the procraw data */
static DexterTimedSampler *procraw_sampler = NULL;
/* procraw structure used as /proc surrogate */
static DxtSysinfoProcrawData procraw_data;
/* data selector mask for the service */
gint procraw_mask;
#endif

static int show_nice_processes;

/* this flags 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)))
    {
      return;
    }
	  fscanf(fp, "%lf", &info.uptime);
	  fclose(fp);
  }
  info.mask |= (1 << INFO_UPTIME);
}

/* 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);
}

static FILE *net_wireless_fp;

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;

	/* 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)))
    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;
		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);
		last_recv = ns->recv;
		last_trans = ns->trans;

		sscanf(p,
		       /* bytes packets errs drop fifo frame compressed multicast|bytes ... */
		       "%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)
			ns->recv +=
			    ((long long) 4294967295U -
			     ns->last_read_recv) + r;
		else
			ns->recv += (r - ns->last_read_recv);
		ns->last_read_recv = r;

		if (t < ns->last_read_trans)
			ns->trans +=
			    ((long long) 4294967295U -
			     ns->last_read_trans) + t;
		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;
		}

		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];
		}
		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];
			}
		}

	}

	fclose(net_dev_fp);

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

inline void update_wifi_stats()
{
	/** wireless stats patch by Bobby Beckmann **/
	static int rep = 0;
	int i;
	char buf[256];
	/*open file and ignore first two lines       sorry, this code sucks ass right now, i'll clean it up later */
	if (net_wireless_fp == NULL)
		net_wireless_fp = open_file("/proc/net/wireless", &rep);
	else
		fseek(net_wireless_fp, 0, SEEK_SET);
	if (net_wireless_fp == NULL)
		return;

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

	/* read each interface */
	for (i = 0; i < 16; i++) {
		struct net_stat *ns;
		char *s, *p;
		int l, m, n;

		if (fgets(buf, 255, net_wireless_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);

		sscanf(p, "%*d   %d.  %d.  %d", &l, &m, &n);

		ns->linkstatus = (int) (log(MIN(MAX(l,1),92)) / log(92) * 100);

	}

	/*** end wireless patch ***/
}

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)))
    {
      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)))
    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;
	}
}

#define I2C_DIR "/sys/bus/i2c/devices/"

int
open_i2c_sensor(const char *dev, const char *type, int n, int *div,
		char *devtype)
{
	char path[256];
	char buf[256];
	int fd;
	int divfd;

	/* if i2c device is NULL or *, get first */
	if (dev == NULL || strcmp(dev, "*") == 0) {
		static int rep = 0;
		if (!get_first_file_in_a_directory(I2C_DIR, buf, &rep))
			return -1;
		dev = buf;
	}

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

	if (strcmp(type, "tempf") == 0) {
		snprintf(path, 255, I2C_DIR "%s/%s%d_input", dev, "temp", n);
	} else {
		snprintf(path, 255, I2C_DIR "%s/%s%d_input", 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 fix i2c or remove it 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, I2C_DIR "%s/%s%d_div", "one", "two",
			 n);
	} else {
		snprintf(path, 255, I2C_DIR "%s/%s%d_div", dev, type, n);
	}

	divfd = open(path, O_RDONLY);
	if (divfd > 0) {
		/* read integer */
		char divbuf[64];
		unsigned int divn;
		divn = read(divfd, divbuf, 63);
		/* should read until n == 0 but I doubt that kernel will give these
		 * in multiple pieces. :) */
		divbuf[divn] = '\0';
		*div = atoi(divbuf);
	}

	close(divfd);

	return fd;
}

double get_i2c_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];
		unsigned int n;
		n = read(*fd, buf, 63);
		/* should read until n == 0 but I doubt that kernel will give these
		 * in multiple pieces. :) */
		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 );
	return;
}

/* 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 ); 
	return;
}

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

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

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

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

/* 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 )
{
/* /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) */
	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 );

	return;
}

#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 );

	return;
}

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

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

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

#define ACPI_BATTERY_BASE_PATH "/proc/acpi/battery"
#define APM_PATH "/proc/apm"

static FILE *acpi_bat_fp;
static FILE *apm_bat_fp;

static int acpi_last_full;

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

static double last_battery_time;

void get_battery_stuff(char *buf, unsigned int n, const char *bat, int item)
{
	static int rep = 0, rep2 = 0;
	char acpi_path[128];
	snprintf(acpi_path, 127, ACPI_BATTERY_BASE_PATH "/%s/state", bat);

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

	last_battery_time = current_update_time;

	memset (last_battery_str, 0, sizeof (last_battery_str));
	memset (last_battery_time_str, 0, sizeof (last_battery_time_str));

	/* first try ACPI */

	if (acpi_bat_fp == NULL && apm_bat_fp == NULL)
		acpi_bat_fp = open_file(acpi_path, &rep);

	if (acpi_bat_fp != NULL) {
		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 == 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) != 0) {
						break;
					}
				}

				fclose(fp);
			}
		}

		fseek(acpi_bat_fp, 0, SEEK_SET);

		strcpy(charging_state, "unknown");

		while (!feof(acpi_bat_fp)) {
			char buf[256];
			if (fgets(buf, 256, acpi_bat_fp) == 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)
			acpi_last_full = remaining_capacity;  /* normalize to 100% */

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

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

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

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

/* 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;
	FILE* fp;
  static int rep=0;

	char buf[512];
	int major, minor;
	unsigned int current = 0;
	unsigned int reads, writes = 0;
	int col_count = 0;

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

	/* read reads and writes from all disks (minor = 0), including
	 * cd-roms and floppies, and summ them up
	 */
	current = 0;
	while (!feof(fp)) {
		fgets(buf, 512, fp);
		col_count = sscanf(buf, "%u %u %*s %*u %*u %u %*u %*u %*u %u",
				   &major, &minor, &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 > 3 &&
		    major != LVM_BLK_MAJOR && major != NBD_MAJOR &&
		    major != RAMDISK_MAJOR && major != LOOP_MAJOR) {
			current += reads + 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);
	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;

	diskio_value = tot;

  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"

void get_ibm_acpi_fan( char * p_client_buffer, size_t client_buffer_size )
{
/* 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)
*/

    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 );
    return;
    
}    

static double last_ibm_acpi_temp_time;
void get_ibm_acpi_temps()
{
/* 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)
*/

/*    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);

}	       


void get_ibm_acpi_volume( char * p_client_buffer, size_t client_buffer_size )
{

/* 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)
*/
    
    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];
	    if (fgets(line, 255, fp) == NULL) break;
	    if (sscanf(line, "level: %d", &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;*/

void get_ibm_acpi_brightness(char * p_client_buffer, size_t client_buffer_size)
{
/* 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)
*/

    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 );
    return;
    
}    

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);
}

#ifdef HAVE_LIBDEXTER
FILE *open_file(const char *file, int *reported)
{
  /* this version of open_file() is the hook that ties the client/server code 
   * into conky. if conky wants to open a /proc file that the server is feeding 
   * us, we do not return an ordinary file stream pointer to the local /proc 
   * filesystem. instead, we return a string stream pointer to the proc surrogate, 
   * so conky parses remote data as if it were local.
   */
  FILE *fp;

  if ((strcmp (file,"/proc/cpuinfo")==0) && (procraw_mask & PROCRAW_CPUINFO))
  {
    if (!procraw_sampler)
      return NULL;
    fp = fmemopen (procraw_data.cpuinfo, procraw_data.cpuinfo_sz, "r");
  }
  else if ((strcmp (file,"/proc/loadavg")==0) && (procraw_mask & PROCRAW_LOADAVG))
  {
    if (!procraw_sampler)
      return NULL;
    fp = fmemopen (procraw_data.loadavg, procraw_data.loadavg_sz, "r");
  }
  else if ((strcmp (file,"/proc/meminfo")==0) && (procraw_mask & PROCRAW_MEMINFO))
  {
    if (!procraw_sampler)
      return NULL;
    fp = fmemopen (procraw_data.meminfo, procraw_data.meminfo_sz, "r");
  }
  else if ((strcmp (file,"/proc/stat")==0) && (procraw_mask & PROCRAW_STAT))
  {
    if (!procraw_sampler)
      return NULL;
    fp = fmemopen (procraw_data.stat, procraw_data.stat_sz, "r");
  }
  else if ((strcmp (file,"/proc/uptime")==0) && (procraw_mask & PROCRAW_UPTIME))
  {
    if (!procraw_sampler)
      return NULL;
    fp = fmemopen (procraw_data.uptime, procraw_data.uptime_sz, "r");
  }
  else if ((strcmp (file,"/proc/net/dev")==0) && (procraw_mask & PROCRAW_NET_DEV))
  {
    if (!procraw_sampler)
      return NULL;
    fp = fmemopen (procraw_data.net_dev, procraw_data.net_dev_sz, "r");
  }
  else if ((strcmp (file,"/proc/diskstats")==0) && (procraw_mask & PROCRAW_DISKSTATS))
  {
    if (!procraw_sampler)
      return NULL;
    fp = fmemopen (procraw_data.diskstats, procraw_data.diskstats_sz, "r");
  }
  else
  {
    fp = fopen(file, "r");
  }

  if (!fp)
  {
    if (!reported || *reported == 0)
    {
      ERR("can't open %s: %s", file, strerror(errno));
      if (reported)
        *reported = 1;
    }
    return 0;
  }
  return fp;
}

void sampler_data_callback (gpointer sampler, gpointer sampler_data)
{
  /* callback runs in a thread */
  if (!sampler)
    return;

  if (sampler_data)
  {
    FILE *out;
    char *p;
    unsigned int i;
    DxtSysinfoProcrawData *data = (DxtSysinfoProcrawData *)sampler_data;

    /* use GNU string streams and stdio locking to exchange data with main thread. */

    /* update /proc/cpuinfo surrogate */
    for (;data->cpuinfo;)
    {
      if (!(out = open_memstream (&procraw_data.cpuinfo, &procraw_data.cpuinfo_sz)))
        break;

      flockfile (out);
      if (procraw_data.cpuinfo)
      {
        free (procraw_data.cpuinfo); procraw_data.cpuinfo=NULL;
      }
      for (p=data->cpuinfo, i=0; i<data->cpuinfo_sz; i++, p++)
      {
        /* we have the FILE lock so use faster putc_unlocked() */
        if (fputc_unlocked (*p, out) == EOF)
          break;
      }
      fclose (out);
      funlockfile (out);
      break;
    }

    /* update /proc/loadavg surrogate */
    for (;data->loadavg;)
    {
      if (!(out = open_memstream (&procraw_data.loadavg, &procraw_data.loadavg_sz)))
        break;

      flockfile (out);
      if (procraw_data.loadavg)
      {
        free (procraw_data.loadavg); procraw_data.loadavg=NULL;
      }
      for (p=data->loadavg, i=0; i<data->loadavg_sz; i++, p++)
      {
        /* we have the FILE lock so use faster putc_unlocked() */
        if (fputc_unlocked (*p, out) == EOF)
          break;
      }
      fclose (out);
      funlockfile (out);
      break;
    }

    /* update /proc/meminfo surrogate */
    for (;data->meminfo;)
    {
      if (!(out = open_memstream (&procraw_data.meminfo, &procraw_data.meminfo_sz)))
        break;

      flockfile (out);
      if (procraw_data.meminfo)
      {
        free (procraw_data.meminfo); procraw_data.meminfo=NULL;
      }
      for (p=data->meminfo, i=0; i<data->meminfo_sz; i++, p++)
      {
        /* we have the FILE lock so use faster putc_unlocked() */
        if (fputc_unlocked (*p, out) == EOF)
          break;
      }
      fclose (out);
      funlockfile (out);
      break;
    }

    /* update /proc/stat surrogate */
    for (;data->stat;)
    {
      if (!(out = open_memstream (&procraw_data.stat, &procraw_data.stat_sz)))
        break;

      flockfile (out);
      if (procraw_data.stat)
      {
        free (procraw_data.stat); procraw_data.stat=NULL;
      }
      for (p=data->stat, i=0; i<data->stat_sz; i++, p++)
      {
        /* we have the FILE lock so use faster putc_unlocked() */
        if (fputc_unlocked (*p, out) == EOF)
          break;
      }
      fclose (out);
      funlockfile (out);
      break;
    }

    /* update /proc/uptime surrogate */
    for (;data->uptime;)
    {
      if (!(out = open_memstream (&procraw_data.uptime, &procraw_data.uptime_sz)))
        break;

      flockfile (out);
      if (procraw_data.uptime)
      {
        free (procraw_data.uptime); procraw_data.uptime=NULL;
      }
      for (p=data->uptime, i=0; i<data->uptime_sz; i++, p++)
      {
        /* we have the FILE lock so use faster putc_unlocked() */
        if (fputc_unlocked (*p, out) == EOF)
          break;
      }
      fclose (out);
      funlockfile (out);
      break;
    }

    /* update /proc/net/dev surrogate */
    for (;data->net_dev;)
    {
      if (!(out = open_memstream (&procraw_data.net_dev, &procraw_data.net_dev_sz)))
        break;

      flockfile (out);
      if (procraw_data.net_dev)
      {
        free (procraw_data.net_dev); procraw_data.net_dev=NULL;
      }
      for (p=data->net_dev, i=0; i<data->net_dev_sz; i++, p++)
      {
        /* we have the FILE lock so use faster putc_unlocked() */
        if (fputc_unlocked (*p, out) == EOF)
          break;
      }
      fclose (out);
      funlockfile (out);
      break;
    }

    /* update /proc/diskstats surrogate */
    for (;data->diskstats;)
    {
      if (!(out = open_memstream (&procraw_data.diskstats, &procraw_data.diskstats_sz)))
        break;

      flockfile (out);
      if (procraw_data.diskstats)
      {
        free (procraw_data.diskstats); procraw_data.diskstats=NULL;
      }
      for (p=data->diskstats, i=0; i<data->diskstats_sz; i++, p++)
      {
        /* we have the FILE lock so use faster putc_unlocked() */
        if (fputc_unlocked (*p, out) == EOF)
          break;
      }
      fclose (out);
      funlockfile (out);
      break;
    }

  /* record data packet arrival time */
  g_mutex_lock (packet_mutex);
  clock_gettime (CLOCK_REALTIME, &packet_arrival_time);
  g_mutex_unlock (packet_mutex);
#ifdef DEBUG
  fprintf(stderr, "Conky: data packet arrived\n");
#endif

  } /* if (sampler_data) ... */
}

/* return 0 on success, -1 on failure */
int dexter_client_init (void)
{
  /* init libdexter for linux-specific client-side activity */

  DexterServiceBroker       *broker;
  DexterPluginServiceGroup  *service_group;
  DexterPluginService       *procraw_service;
  DexterSamplerDataCallback *callbacks;
  GError                    *error = NULL;

  /* create a service broker so we can query the server for its services */
  if (!(broker = dexter_service_broker_new (info.dexter.channel)))
  {
    ERR ("unable to create service broker");
    return (-1);
  }

  /* fetch the services from the server */
  service_group = dexter_service_broker_get_services (broker, DEXTER_SERVICE_SAMPLER, &error);
  if (error)
  {
    ERR("%s", error->message);
    g_clear_error (&error);
    dexter_service_broker_free (broker);
    return (-1);
  }

  /* dont need service broker any more */
  dexter_service_broker_free (broker);
  broker=NULL;

  /* find the procraw service */
  procraw_service=NULL;
  if (!dexterplugin_service_group_find_uuid (&procraw_service, service_group, PROCRAW_SERVICE_UUID))
  {
    ERR ("server doesn't offer the procraw service: (%s)", PROCRAW_SERVICE_UUID);
    dexterplugin_service_group_free (service_group);
    return (-1);
  }

  /* create null-terminated callback list with one callback on it */
  callbacks = g_new0 (DexterSamplerDataCallback, 2);
  callbacks[0] = sampler_data_callback;

  /* create the procraw timed sampler, timed to match conky's update_interval */
  procraw_sampler = dexter_timedsampler_new (procraw_service, update_interval*G_USEC_PER_SEC,
                                             callbacks, info.dexter.channel, &error);
  if (error)
  {
    ERR("%s", error->message);
    g_clear_error (&error);
    dexterplugin_service_group_free (service_group);
    return (-1);
  }

  /* free callbacks as libdexter makes internal copy */
  g_free (callbacks);
  callbacks=NULL;

  /* initialize the timed sampler */
  procraw_mask = 0;
  if (need_mask & (1 << INFO_FREQ))
    procraw_mask |= PROCRAW_CPUINFO;
  if (need_mask & (1 << INFO_LOADAVG))
    procraw_mask |= PROCRAW_LOADAVG;
  if ((need_mask & (1 << INFO_MEM)) || (need_mask & (1 << INFO_BUFFERS)))
    procraw_mask |= PROCRAW_MEMINFO;
  if ((need_mask & (1 << INFO_CPU)) || (need_mask & (1 << INFO_PROCS)) || 
      (need_mask & (1 << INFO_RUN_PROCS)) || (need_mask & (1 << INFO_FREQ )))
    procraw_mask |= PROCRAW_STAT;
  if (need_mask & (1 << INFO_UPTIME))
    procraw_mask |= PROCRAW_UPTIME;
  if (need_mask & (1 << INFO_NET))
    procraw_mask |= PROCRAW_NET_DEV;
  if (need_mask & (1 << INFO_DISKIO))
    procraw_mask |= PROCRAW_DISKSTATS;

  dexter_timedsampler_initialize (procraw_sampler, &procraw_mask, NULL, &error);
  if (error)
  {
    ERR("%s", error->message);
    g_clear_error (&error);
    dexter_timedsampler_free (procraw_sampler, NULL);
    dexterplugin_service_group_free (service_group);
    return (-1);
  }

  /* start the timed sampler and begin receiving updates from server */
  dexter_timedsampler_start (procraw_sampler, &error);
  if (error)
  {
    ERR("%s", error->message);
    g_clear_error (&error);
    dexter_timedsampler_free (procraw_sampler, NULL);
    dexterplugin_service_group_free (service_group);
    return (-1);
  }

  dexterplugin_service_group_free (service_group);

  /* so far, so good.  tell the linux routines to read /proc, 
   * even if other api's are available. */
  prefer_proc = 1;

  return 0;
}

/* return 0 on success, -1 on failure */
int dexter_client_exit (void)
{
  /* de-init libdexter for linux-specific client-side activity */

  if (procraw_sampler)
  {
    dexter_timedsampler_stop (procraw_sampler, NULL);
    dexter_timedsampler_free (procraw_sampler, NULL);
    procraw_sampler=NULL;
  }
  
  /* free left-over sampler data.  ok to do this without thread sync because 
   * this function runs in the same thread that conky issues open_file(). */
  if (procraw_data.cpuinfo)
  {
    free (procraw_data.cpuinfo); procraw_data.cpuinfo=NULL;
  }
  if (procraw_data.loadavg)
  {
    free (procraw_data.loadavg); procraw_data.loadavg=NULL;
  }
  if (procraw_data.meminfo)
  {
    free (procraw_data.meminfo); procraw_data.meminfo=NULL;
  }
  if (procraw_data.stat)
  {
    free (procraw_data.stat); procraw_data.stat=NULL;
  }
  if (procraw_data.uptime)
  {
    free (procraw_data.uptime); procraw_data.uptime=NULL;
  }
  if (procraw_data.net_dev)
  {
    free (procraw_data.net_dev); procraw_data.net_dev=NULL;
  }
  if (procraw_data.diskstats)
  {
    free (procraw_data.diskstats); procraw_data.diskstats=NULL;
  }

  info.uptime=0.0;
  info.procs=0;
  info.mem = info.memmax = info.swap = info.swapmax = info.bufmem = info.buffers = info.cached = 0;
  info.run_procs=0;
  if (info.cpu_usage)
  {
    memset(info.cpu_usage, 0, info.cpu_count * sizeof (float));
  }
  clear_net_stats ();
  diskio_value=0;
  return 0;
}
#endif