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xmem/get_mem.c

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/* $Id: get_mem.c,v 1.5 2018/12/26 18:46:04 bch Exp $
*
* xmem(1) utility adapted by Christian Barthel <bch@online.de>:
* - Added OpenBSD support
* - Added FreeBSD support
*
* get memory usage, from get_load.c derived
*
* Author: Hans-Helmut Buehmann 20. Jan. 1996
*
* Modified for more recent kernels Helmut Geyer Oct. 1996
*/
#if __OpenBSD__
#include <sys/param.h> /* DEV_BSIZE MAXCOMLEN PZERO */
#include <sys/sysctl.h>
#include <sys/swap.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <unistd.h>
#include <X11/Xos.h>
#include <X11/Intrinsic.h>
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include "MemStripChart.h"
static int pageshift = -1;
#define pagetok(size) ((size) << pageshift)
#define LOG1024 10
static double allmem_kb = 0;
static void initPageShift(void)
{
int pagesize = getpagesize();
pageshift = 0;
while (pagesize > 1) {
pageshift++;
pagesize >>= 1;
}
pageshift -= LOG1024;
}
static double getSwapFrac()
{
struct swapent *swdev;
int used, total, nswap, rnswap, i;
nswap = swapctl(SWAP_NSWAP, 0, 0);
if (nswap == 0)
return 0;
swdev = calloc(nswap, sizeof(*swdev));
if (swdev == NULL)
return 0;
rnswap = swapctl(SWAP_STATS, swdev, nswap);
if (rnswap == -1) {
free(swdev);
return 0;
}
/* 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));
}
}
free(swdev);
return (double)used/total;
}
void GetMemLoadPoint(Widget w, caddr_t closure, caddr_t call_data)
{
static int bcstats_mib[] = {CTL_VFS, VFS_GENERIC, VFS_BCACHESTAT};
static int uvmexp_mib[] = {CTL_VM, VM_UVMEXP};
MemStripChartCallbackData ret;
struct uvmexp uvmexp;
struct bcachestats bcstats;
size_t size;
if (pageshift < 0)
initPageShift();
size = sizeof(uvmexp);
if (sysctl(uvmexp_mib, 2, &uvmexp, &size, NULL, 0) < 0) {
warn("sysctl failed");
bzero(&uvmexp, sizeof(uvmexp));
}
size = sizeof(bcstats);
if (sysctl(bcstats_mib, 3, &bcstats, &size, NULL, 0) < 0) {
warn("sysctl failed");
bzero(&bcstats, sizeof(bcstats));
}
allmem_kb = pagetok(uvmexp.npages);
ret.cached = pagetok(bcstats.numbufpages) / allmem_kb;
ret.free = pagetok(uvmexp.free) / allmem_kb;
ret.buffer = 0;
ret.code = (1 - ret.cached - ret.free);
ret.swap = getSwapFrac();
#ifdef DEBUG
printf("%lf %lf %lf %lf %lf\n",
allmem_kb,
ret.code,
ret.cached,
ret.free,
ret.swap);
#endif
memcpy(call_data, &ret, sizeof(MemStripChartCallbackData));
}
#endif
/* ------------------------------------------------------------------- */
#if __FreeBSD__
/* $Id: get_mem_fbsd.c,v 1.1 2018/12/26 18:46:16 bch Exp $
*
* Author: Christian Barthel <bch@online.de>
*/
#include <sys/types.h> /* DEV_BSIZE MAXCOMLEN PZERO */
#include <sys/sysctl.h>
#include <unistd.h>
#include <kvm.h>
#include <X11/Xos.h>
#include <X11/Intrinsic.h>
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include "MemStripChart.h"
static int pageshift = -1;
static int pagesize = 0;
static kvm_t *kd = 0;
#define pagetok(size) ((size) << pageshift)
#define LOG1024 10
static unsigned int allmem_pages = 0;
static void initPageShift(void)
{
pagesize = getpagesize();
size_t len = sizeof(allmem_pages);
int mib[len];
pageshift = 0;
while (pagesize > 1) {
pageshift++;
pagesize >>= 1;
}
pageshift -= LOG1024;
kd = kvm_open(NULL, "/dev/null" ,NULL, O_RDONLY, "kvm_open");
if (sysctlbyname("vm.stats.vm.v_page_count", &allmem_pages, &len, NULL, 0) == -1)
perror("sysctl");
#ifdef DEBUG
printf("page_count: %d\n", allmem_pages);
#endif
}
static double getSwapFrac()
{
/* XXX Borrowed from top(1) code: */
int n;
struct kvm_swap swapary[1];
static int pagesize = 0;
static unsigned long swap_maxpages = 0;
size_t sz = sizeof(swap_maxpages);
int retavail = 0;
int retfree = 0;
n = kvm_getswapinfo(kd, swapary, 1, 0);
if (n < 0 || swapary[0].ksw_total == 0)
return (0);
if (swap_maxpages == 0)
sysctlbyname("vm.swap_maxpages",
&swap_maxpages, &sz, NULL, 0);
if ( swapary[0].ksw_total > swap_maxpages )
swapary[0].ksw_total = swap_maxpages;
retavail = swapary[0].ksw_total;
retfree = swapary[0].ksw_total - swapary[0].ksw_used;
#ifdef DEBUG
printf("swap: %d %d %d %d\n", retavail,
retavail, swapary[0].ksw_total,
swapary[0].ksw_used);
#endif
return (double)(retavail-retfree)/(double)retavail;
}
void GetMemLoadPoint(Widget w, caddr_t closure, caddr_t call_data)
{
MemStripChartCallbackData ret;
int a, b;
size_t sz = sizeof(int);
double cache = 0;
if (pageshift < 0)
initPageShift();
sysctlbyname("vm.stats.vm.v_wire_count", &a, &sz, NULL, 0);
ret.code = (double)a / (double)allmem_pages;
sysctlbyname("vm.stats.vm.v_active_count", &a, &sz, NULL, 0);
ret.buffer = (double)a / (double)allmem_pages;
/* v_cache_count and v_inactive_count are treated similarly */
sysctlbyname("vm.stats.vm.v_inactive_count", &a, &sz, NULL, 0);
sysctlbyname("vm.stats.vm.v_cache_count", &b, &sz, NULL, 0);
ret.cached = (double)(a + b) / allmem_pages;
sysctlbyname("vm.stats.vm.v_free_count", &a, &sz, NULL, 0);
ret.free = (double)a / allmem_pages;
ret.swap = getSwapFrac();
#ifdef DEBUG
printf("%u %lf %lf %lf %lf\n", allmem_pages,
ret.code, ret.cached, ret.free, ret.swap);
#endif
memcpy(call_data, &ret, sizeof(MemStripChartCallbackData));
}
#endif
/* ------------------------------------------------------------------ */
#if __gnu_linux__
#include <X11/Xos.h>
#include <X11/Intrinsic.h>
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include "MemStripChart.h"
static unsigned int total_mem = 0;
int GetRamInKB(int type)
{
FILE *meminfo = fopen("/proc/meminfo", "r");
if(meminfo == NULL)
err(1, "fopen on /proc/meminfo failed: ");
char line[256];
int memory = -1;
int found = 0;
while(found == 0 && fgets(line, sizeof(line), meminfo))
{
if (type == 1) {
if((sscanf(line, "MemTotal: %d kB", &memory)) == 1)
found = 1;
}
if (type == 2) {
if(sscanf(line, "MemFree: %d kB", &memory) == 1)
found = 1;
}
if (type == 3) {
if(sscanf(line, "Buffers: %d kB", &memory) == 1)
found = 1;
}
if (type == 4) {
if(sscanf(line, "Cached: %d kB", &memory) == 1)
found = 1;
}
if (type == 5) {
if(sscanf(line, "SwapTotal: %d kB", &memory) == 1)
found = 1;
}
if (type == 6) {
if(sscanf(line, "SwapFree: %d kB", &memory) == 1)
found = 1;
}
}
if (!found)
warnx("failed to sscanf type %d", type);
fclose(meminfo);
return memory;
}
static void init_total_mem(void)
{
if (total_mem <= 0)
total_mem = GetRamInKB(1);
#ifdef DEBUG
printf("MemTotal: %d\n", total_mem);
#endif
}
void GetMemLoadPoint(Widget w, caddr_t closure, caddr_t call_data)
{
MemStripChartCallbackData ret;
init_total_mem();
/* free(1):
* total
* used = total - free - buffers - cache
* /proc/meminfo
* total = MemTotal
* code = total - free - buffers - cache (“used”)
* buffer = Buffers
* cached = Cached
* free = MemFree
*/
int mem_free = GetRamInKB(2);
int buffers = GetRamInKB(3);
int cached = GetRamInKB(4);
int swap_total = GetRamInKB(5);
int swap_free = GetRamInKB(6);
ret.code = (total_mem - mem_free - buffers - cached)/(float)total_mem;
ret.buffer = (buffers)/(float)total_mem;
ret.cached = (cached)/(float)total_mem;
ret.free = (mem_free)/(float)total_mem;
ret.swap = (swap_total - swap_free)/(float)swap_total;
#ifdef DEBUG
printf("%u %lf %lf %lf %lf\n", total_mem,
ret.code, ret.cached, ret.free, ret.swap);
#endif
memcpy(call_data, &ret, sizeof(MemStripChartCallbackData));
}
#endif
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