Platform.c

/*
htop - openbsd/Platform.c
(C) 2014 Hisham H. Muhammad
(C) 2015 Michael McConville
Released under the GNU GPL, see the COPYING file
in the source distribution for its full text.
*/

#include "Platform.h"
#include "Meter.h"
#include "CPUMeter.h"
#include "MemoryMeter.h"
#include "SwapMeter.h"
#include "TasksMeter.h"
#include "LoadAverageMeter.h"
#include "UptimeMeter.h"
#include "ClockMeter.h"
#include "HostnameMeter.h"
#include "OpenBSDProcess.h"
#include "OpenBSDProcessList.h"

#include <sys/sched.h>
#include <uvm/uvmexp.h>
#include <sys/param.h>
#include <sys/swap.h>

#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <time.h>

/*{
#include "Action.h"
#include "BatteryMeter.h"

extern ProcessFieldData Process_fields[];

}*/

#define MAXCPU 256
// XXX: probably should be a struct member
static int64_t old_v[MAXCPU][5];

/*
 * Copyright (c) 1984, 1989, William LeFebvre, Rice University
 * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
 *
 * Taken directly from OpenBSD's top(1).
 *
 * percentages(cnt, out, new, old, diffs) - calculate percentage change
 * between array "old" and "new", putting the percentages in "out".
 * "cnt" is size of each array and "diffs" is used for scratch space.
 * The array "old" is updated on each call.
 * The routine assumes modulo arithmetic.  This function is especially
 * useful on BSD machines for calculating cpu state percentages.
 */
static int percentages(int cnt, int64_t *out, int64_t *new, int64_t *old, int64_t *diffs) {
	int64_t change, total_change, *dp, half_total;
	int i;

	/* initialization */
	total_change = 0;
	dp = diffs;

	/* calculate changes for each state and the overall change */
	for (i = 0; i < cnt; i++) {
		if ((change = *new - *old) < 0) {
			/* this only happens when the counter wraps */
			change = INT64_MAX - *old + *new;
		}
		total_change += (*dp++ = change);
		*old++ = *new++;
	}

	/* avoid divide by zero potential */
	if (total_change == 0)
		total_change = 1;

	/* calculate percentages based on overall change, rounding up */
	half_total = total_change / 2l;
	for (i = 0; i < cnt; i++)
		*out++ = ((*diffs++ * 1000 + half_total) / total_change);

	/* return the total in case the caller wants to use it */
	return (total_change);
}

ProcessField Platform_defaultFields[] = { PID, USER, PRIORITY, NICE, M_SIZE, M_RESIDENT, STATE, PERCENT_CPU, PERCENT_MEM, TIME, COMM, 0 };

int Platform_numberOfFields = LAST_PROCESSFIELD;

void Platform_setBindings(Htop_Action* keys) {
   (void) keys;
}

MeterClass* Platform_meterTypes[] = {
   &CPUMeter_class,
   &ClockMeter_class,
   &LoadAverageMeter_class,
   &LoadMeter_class,
   &MemoryMeter_class,
   &SwapMeter_class,
   &TasksMeter_class,
   &UptimeMeter_class,
   &BatteryMeter_class,
   &HostnameMeter_class,
   &AllCPUsMeter_class,
   &AllCPUs2Meter_class,
   &LeftCPUsMeter_class,
   &RightCPUsMeter_class,
   &LeftCPUs2Meter_class,
   &RightCPUs2Meter_class,
   &BlankMeter_class,
   NULL
};

// preserved from FreeBSD port
int Platform_getUptime() {
   struct timeval bootTime, currTime;
   int mib[2] = { CTL_KERN, KERN_BOOTTIME };
   size_t size = sizeof(bootTime);
   
   int err = sysctl(mib, 2, &bootTime, &size, NULL, 0);
   if (err) {
      return -1;
   }
   gettimeofday(&currTime, NULL);

   return (int) difftime(currTime.tv_sec, bootTime.tv_sec);
}

void Platform_getLoadAverage(double* one, double* five, double* fifteen) {
   struct loadavg loadAverage;
   int mib[2] = { CTL_VM, VM_LOADAVG };
   size_t size = sizeof(loadAverage);
   
   int err = sysctl(mib, 2, &loadAverage, &size, NULL, 0);
   if (err) {
      *one = 0;
      *five = 0;
      *fifteen = 0;
      return;
   }
   *one     = (double) loadAverage.ldavg[0] / loadAverage.fscale;
   *five    = (double) loadAverage.ldavg[1] / loadAverage.fscale;
   *fifteen = (double) loadAverage.ldavg[2] / loadAverage.fscale;
}

int Platform_getMaxPid() {
   // this is hard-coded in sys/sys/proc.h - no sysctl exists
   return 32766;
}

double Platform_setCPUValues(Meter* this, int cpu) {
	int i;
	double perc;

	OpenBSDProcessList* pl = (OpenBSDProcessList*) this->pl;
	CPUData* cpuData = &(pl->cpus[cpu]);
	int64_t new_v[CPUSTATES], diff_v[CPUSTATES], scratch_v[CPUSTATES];
	double *v = this->values;
	size_t size = sizeof(double) * CPUSTATES;
	int mib[] = { CTL_KERN, KERN_CPTIME2, cpu-1 };
	if (sysctl(mib, 3, new_v, &size, NULL, 0) == -1) {
		puts("err!");
		//return 0.;
	}

	// XXX: why?
	cpuData->totalPeriod = 1;

	percentages(CPUSTATES, diff_v, new_v,
			(int64_t *)old_v[cpu-1], scratch_v);

	for (i = 0; i < CPUSTATES; i++) {
		old_v[cpu-1][i] = new_v[i];
		v[i] = diff_v[i] / 10.;
	}

	Meter_setItems(this, 4);

	perc = v[0] + v[1] + v[2] + v[3];

	if (perc <= 100. && perc >= 0.) {
		return perc;
	} else {
		return 12.34;
	}
}

void Platform_setMemoryValues(Meter* this) {
   ProcessList* pl = (ProcessList*) this->pl;
   long int usedMem = pl->usedMem;
   long int buffersMem = pl->buffersMem;
   long int cachedMem = pl->cachedMem;
   usedMem -= buffersMem + cachedMem;
   this->total = pl->totalMem;
   this->values[0] = usedMem;
   this->values[1] = buffersMem;
   this->values[2] = cachedMem;
}

/*
 * Copyright (c) 1994 Thorsten Lockert <tholo@sigmasoft.com>
 * All rights reserved.
 *
 * Taken almost directly from OpenBSD's top(1)
 */
void Platform_setSwapValues(Meter* this) {
	ProcessList* pl = (ProcessList*) this->pl;
	struct swapent *swdev;
	unsigned long long int total, used;
	int nswap, rnswap, i;
	nswap = swapctl(SWAP_NSWAP, 0, 0);
	if (nswap == 0) {
		return;
	}

	swdev = calloc(nswap, sizeof(*swdev));
	if (swdev == NULL) {
		return;
	}

	rnswap = swapctl(SWAP_STATS, swdev, nswap);
	if (rnswap == -1) {
		free(swdev);
		return;
	}

	// if rnswap != nswap, then what?

	/* Total things up */
	total = used = 0;
	for (i = 0; i < nswap; i++) {
		if (swdev[i].se_flags & SWF_ENABLE) {
			used += (swdev[i].se_inuse / (1024 / DEV_BSIZE));
			total += (swdev[i].se_nblks / (1024 / DEV_BSIZE));
		}
	}

	this->total = pl->totalSwap = total;
	this->values[0] = pl->usedSwap = used;

	free(swdev);
}

void Platform_setTasksValues(Meter* this) {
   // TODO
}