swapmeter.cc

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//  
//  Initial port performed by Greg Onufer (exodus@cheers.bungi.com)
//
#include "swapmeter.h"
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/swap.h>
#include <iostream>
 
 
SwapMeter::SwapMeter(XOSView *parent, kstat_ctl_t *_kc)
    : FieldMeterGraph(parent, 2, "SWAP", "USED/FREE")
{
    pagesize = sysconf(_SC_PAGESIZE);
}
 
SwapMeter::~SwapMeter(void)
{
}
 
void SwapMeter::checkResources(void)
{
    FieldMeterGraph::checkResources();
 
    setfieldcolor(0, parent_->getResource("swapUsedColor"));
    setfieldcolor(1, parent_->getResource("swapFreeColor"));
    priority_ = atoi(parent_->getResource("swapPriority"));
    dodecay_ = parent_->isResourceTrue("swapDecay");
    useGraph_ = parent_->isResourceTrue("swapGraph");
    SetUsedFormat(parent_->getResource("swapUsedFormat"));
}
 
void SwapMeter::checkevent(void)
{
    getswapinfo();
    drawfields();
}
 
void SwapMeter::getswapinfo(void)
{
    swaptbl_t *swaps;
    char *names;
 
    total_ = fields_[0] = fields_[1] = 0;
    int numswap = swapctl(SC_GETNSWP, NULL);
    if (numswap < 0) {
        std::cerr << "Can not determine number of swap spaces." << std::endl;
        parent_->done(1);
        return;
    }
    if (numswap > 0) {
        swaps = (swaptbl_t *)malloc(sizeof(swaptbl_t) + numswap * sizeof(swapent_t));
        names = (char *)calloc(numswap + 1, PATH_MAX);
        if (!swaps || !names) {
            std::cerr << "malloc failed." << std::endl;
            parent_->done(1);
            return;
        }
        swaps->swt_n = numswap;
        for (int i = 0; i <= numswap; i++)
            swaps->swt_ent[i].ste_path = names + (i * PATH_MAX);
 
        if (swapctl(SC_LIST, swaps) < 0) {
            std::cerr << "Can not get list of swap spaces." << std::endl;
            parent_->done(1);
            return;
        }
        for (int i = 0; i < numswap; i++) {
            total_ += swaps->swt_ent[i].ste_pages;
            fields_[1] += swaps->swt_ent[i].ste_free;
            XOSDEBUG("%s: %ld kB (%ld kB free)\n",
                     swaps->swt_ent[i].ste_path,
                     swaps->swt_ent[i].ste_pages * (pagesize / 1024),
                     swaps->swt_ent[i].ste_free * (pagesize / 1024));
        }
        fields_[0] = total_ - fields_[1];
        free(swaps);
        free(names);
    }
 
    setUsed(fields_[0] * pagesize, total_ * pagesize);
}