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#include <stdio.h>
#include <iostream>
#include "meminfometer.h"
#ifdef __sun__
#include <limits.h>
#include <errno.h>
#include <kstat.h>
#include <string.h>
#include <stdlib.h>
#include <sys/sysinfo.h>
#include <sys/stat.h>
#include <sys/swap.h>
#endif
#ifdef __FreeBSD__
#include <fcntl.h>
#include <kvm.h>
#include <sys/dkstat.h>
#include <sys/vmmeter.h>
#endif
#ifdef __linux__
#include <sys/sysinfo.h>
#endif
bool getMeminfo(Meminfo & meminfo)
{
#ifdef __linux__
/*
FILE *fmem;
if ( (fmem = fopen("/proc/meminfo", "r") ) != NULL)
{
fscanf(fmem, "%*s %*s %*s %*s %*s %*s");
fscanf(fmem, "%*s %lu %lu %lu %lu %lu %lu",
&meminfo.mem_total,
&meminfo.mem_used,
&meminfo.mem_free,
&meminfo.mem_shared,
&meminfo.mem_buffers,
&meminfo.mem_cached);
fscanf(fmem, "%*s %lu %lu %lu",
&meminfo.swap_total,
&meminfo.swap_used,
&meminfo.swap_free);
fclose(fmem);
return true;
}
*/
// alternative interface
struct sysinfo info;
sysinfo(&info);
meminfo.mem_total = float(info.totalram) * float(info.mem_unit);
meminfo.mem_free = float(info.freeram) * float(info.mem_unit);
meminfo.mem_used = meminfo.mem_total - meminfo.mem_free;
meminfo.swap_total = float(info.totalswap) * float(info.mem_unit);
meminfo.swap_free = float(info.freeswap) * float(info.mem_unit);
meminfo.swap_used = meminfo.swap_total - meminfo.swap_free;
/*
cout << "meminfo.swap_total " << meminfo.swap_total << endl
<< "meminfo.swap_used " << meminfo.swap_used << endl
<< "meminfo.swao_free " << meminfo.swap_free << endl;
*/
return true;
#endif
#ifdef __FreeBSD__
kvm_t *kd;
if ((kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open")) == NULL)
{
fprintf(stderr, "kvm_open failed\n");
return false;
}
struct nlist nlst[] =
{
#define X_CNT 0
{ "_cnt" },
{ 0 }
};
kvm_nlist(kd, nlst);
if (nlst[0].n_type == 0)
{
fprintf(stderr, "kvm_nlist failed\n");
return false;
}
struct vmmeter sum;
if (kvm_read(kd, nlst[X_CNT].n_value,
&sum, sizeof(sum)) != sizeof(sum))
{
fprintf(stderr, "kvm_read failed\n");
return false;
}
struct kvm_swap swapary[1];
int n = kvm_getswapinfo(kd, swapary, 1, 0);
if (n < 0 || swapary[0].ksw_total == 0)
return false;
kvm_close(kd);
meminfo.mem_total = float(sum.v_page_size) * float(sum.v_page_count);
meminfo.mem_free = float(sum.v_page_size) * float(sum.v_free_count);
meminfo.mem_used = meminfo.mem_total - meminfo.mem_free;
meminfo.swap_total = float(sum.v_page_size) * float(swapary[0].ksw_total);
meminfo.swap_used = float(sum.v_page_size) * float(swapary[0].ksw_used);
meminfo.swap_free = meminfo.swap_total - meminfo.swap_used;
return true;
#endif
#ifdef __sun__
struct kstat_ctl *kc;
if ((kc = kstat_open()) == 0)
{
fprintf(stderr, "Sorry, I cannot initialise the `kstat' library.\n"
"This library is used for accessing kernel information.\n"
"The diagnostics are: `%s'.\n\n", strerror(errno));
}
else
{
kstat_t * ksp;
// availrmem = pages of core for user-proc ( == physmem - kernelmem)
// freemem = no of free pages
// physmem == total mem in 4KB blocks
errno = 0;
if ((ksp = kstat_lookup(kc, "unix", -1, "system_pages")) == 0 ||
kstat_read(kc, ksp, 0) == -1)
fprintf(stderr, "Sorry, I cannot read the memory statistics entry\n"
"from the `kstat' library. The diagnostics are `%s'\n\n", strerror(errno));
unsigned long physmem = 0;
unsigned long freemem = 0;
unsigned long availrmem = 0;
kstat_named_t *kn = (kstat_named_t *)ksp->ks_data;
for (int i = 0; i < (int) ksp->ks_ndata; i++)
{
if (strcmp(kn->name, "physmem") == 0)
physmem = kn->value.ul;
else if (strcmp(kn->name, "freemem") == 0)
freemem = kn->value.ul;
else if (strcmp(kn->name, "availrmem") == 0)
availrmem = kn->value.ul;
kn++;
}
if (physmem == 0) // sanity check, this should always be > 0
fprintf(stderr, "Uh uh, there seems to be a problem with my handling\n"
"of the `kstat' library: I determined 0 physical memory!\n"
"(Free memory is %ld, available memory is %ld.)\n\n", freemem, availrmem);
if (kc != 0)
kstat_close(kc);
meminfo.mem_total = float(physmem) * 4096.;
meminfo.mem_free = float(freemem) * 4096.;
meminfo.mem_used = float(availrmem - freemem) * 4096.;
/*
cout << "meminfo.mem_total " << meminfo.mem_total << endl
<< "meminfo.mem_used " << meminfo.mem_used << endl
<< "meminfo.mem_free " << meminfo.mem_free << endl;
*/
meminfo.swap_total = 0;
meminfo.swap_used = 0;
meminfo.swap_free = 0;
int swapentries;
if ((swapentries = swapctl(SC_GETNSWP, 0)) == -1)
fprintf(stderr, "Sorry, cannot determine the number of\n"
"swap spaces. The diagnostics are `%s'.\n\n", strerror(errno));
if (swapentries != 0)
{
// 2* to get some space for padding??
swaptbl_t *stbl = (swaptbl_t *) malloc(2 * sizeof(int) + swapentries * sizeof(struct swapent));
if (stbl == 0)
fprintf(stderr, "Sorry, I ran out of memory while\n"
"trying to determine the swap usage.\n");
char path[PATH_MAX + 1];
stbl->swt_n = swapentries;
for (int i = 0; i < swapentries; i++)
stbl->swt_ent[i].ste_path = path;
if ((swapentries = swapctl(SC_LIST, stbl)) == -1)
fprintf(stderr, "Sorry, I cannot determine the swap usage.\n"
"The diagnostics are `%s'.\n\n", strerror(errno));
if (swapentries != stbl->swt_n)
fprintf(stderr, "Strange, I requested information for\n"
"%ld swap spaces, but only got %ld swap entries back.\n", stbl->swt_n, swapentries);
for (int i = 0; i < swapentries; i++)
{
meminfo.swap_total += float(stbl->swt_ent[i].ste_pages);
meminfo.swap_free += float(stbl->swt_ent[i].ste_free);
}
free(stbl);
}
meminfo.swap_total *= 4096.;
meminfo.swap_free *= 4096.;
meminfo.swap_used = meminfo.swap_total - meminfo.swap_free;
return true;
}
#endif
return false;
}
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