4aiman/xfce4-systemload-plugin-zram
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xfce4-systemload-plugin-zram/panel-plugin/memswap.cc
4aiman 0a59ec699f zram-aware memory, configurable uptime format (1:1.3.2-2ubuntu3+zram2) 
- zram.cc/.h: read zram usage; memory bar can subtract RAM held by zram
- memswap: zram and disk swap shown separately in the tooltip
- uptime: format string with %d %h %m %s, %H %M %S, %t, \n and {...}
- settings dialog fields for both, Russian translation
- tests/test_format_uptime.cc with tests/run.sh
This is what the installed 1:1.3.2-2ubuntu3+zram2 package was built from.
2026-11-03 22:24:11 +03:00

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/*
* This file is part of Xfce (https://gitlab.xfce.org).
*
* Copyright (c) 2003 Riccardo Persichetti <riccardo.persichetti@tin.it>
* Copyright (c) 2010 Florian Rivoal <frivoal@xfce.org>
* Copyright (c) 2022 Jan Ziak <0xe2.0x9a.0x9b@xfce.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glib.h>
#include "memswap.h"
#include "zram.h"
#if defined(__linux__) || defined(__FreeBSD_kernel__)
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define MEMINFOBUFSIZE (2 * 1024)
static char MemInfoBuf[MEMINFOBUFSIZE];
static unsigned long MTotal = 0;
static unsigned long MFree = 0;
static unsigned long MBuffers = 0;
static unsigned long MCached = 0;
static unsigned long MAvail = 0;
static unsigned long MUsed = 0;
static unsigned long STotal = 0;
static unsigned long SFree = 0;
static unsigned long SUsed = 0;
gint read_memswap(gulong *mem, gulong *swap, gulong *MT, gulong *MU, gulong *ST, gulong *SU)
{
char *b_MTotal, *b_MFree, *b_MBuffers, *b_MCached, *b_MAvail, *b_STotal, *b_SFree;
const char *filepath = "/proc/meminfo";
int fd;
if ((fd = open(filepath, O_RDONLY)) < 0)
{
g_warning ("Cannot open '%s'", filepath);
return -1;
}
ssize_t n = read(fd, MemInfoBuf, MEMINFOBUFSIZE - 1);
close(fd);
if (n < 0)
{
g_warning ("Cannot read '%s'", filepath);
return -1;
}
if (n == MEMINFOBUFSIZE - 1)
{
g_warning ("Internal buffer too small to read '%s'", filepath);
return -1;
}
MemInfoBuf[n] = '\0';
b_MTotal = strstr(MemInfoBuf, "MemTotal");
if (!b_MTotal || !sscanf(b_MTotal + strlen("MemTotal"), ": %lu", &MTotal))
return -1;
b_MFree = strstr(MemInfoBuf, "MemFree");
if (!b_MFree || !sscanf(b_MFree + strlen("MemFree"), ": %lu", &MFree))
return -1;
b_MBuffers = strstr(MemInfoBuf, "Buffers");
if (!b_MBuffers || !sscanf(b_MBuffers + strlen("Buffers"), ": %lu", &MBuffers))
return -1;
b_MCached = strstr(MemInfoBuf, "Cached");
if (!b_MCached || !sscanf(b_MCached + strlen("Cached"), ": %lu", &MCached))
return -1;
/* In Linux 3.14+, use MemAvailable instead */
b_MAvail = strstr(MemInfoBuf, "MemAvailable");
if (b_MAvail && sscanf(b_MAvail + strlen("MemAvailable"), ": %lu", &MAvail))
{
MFree = MAvail;
MBuffers = 0;
MCached = 0;
}
b_STotal = strstr(MemInfoBuf, "SwapTotal");
if (!b_STotal || !sscanf(b_STotal + strlen("SwapTotal"), ": %lu", &STotal))
return -1;
b_SFree = strstr(MemInfoBuf, "SwapFree");
if (!b_SFree || !sscanf(b_SFree + strlen("SwapFree"), ": %lu", &SFree))
return -1;
MFree += MCached + MBuffers;
MUsed = MTotal - MFree;
/*
* MUsed deliberately still includes the RAM held by zram: that memory is
* in fact occupied and unavailable to anyone. Whether to subtract it is a
* presentation choice, made by the caller through the "exclude zram from
* memory usage" setting - see update_monitors() in systemload.cc.
*/
/*
* SwapTotal/SwapFree lump zram together with disk swap, and for zram they
* report the UNCOMPRESSED size - a figure that corresponds to nothing
* physical. Ask /proc/swaps instead and count only the disk-backed areas:
* anything landing there is a genuine spill out of RAM.
*
* If /proc/swaps is unreadable, fall back to the meminfo numbers.
*/
{
gulong DTotal = 0, DUsed = 0;
if (read_disk_swap(&DTotal, &DUsed) == 0)
{
STotal = DTotal;
SUsed = DUsed;
}
else
{
SUsed = STotal - SFree;
}
}
*mem = MUsed * 100 / MTotal;
if(STotal)
*swap = SUsed * 100 / STotal;
else
*swap = 0;
*MT = MTotal;
*MU = MUsed;
*ST = STotal;
*SU = SUsed;
return 0;
}
#elif defined(__FreeBSD__) || defined(__DragonFly__)
/*
* This is inspired by /usr/src/usr.bin/top/machine.c
*
* Adapted by Thorsten Greiner <thorsten.greiner@web.de>
*
* Original authors: Christos Zoulas <christos@ee.cornell.edu>
* Steven Wallace <swallace@freebsd.org>
* Wolfram Schneider <wosch@FreeBSD.org>
* Thomas Moestl <tmoestl@gmx.net>
*/
/*
* FreeBSD defines MAX and MIN in sys/param.h, so undef the glib macros first
*/
#ifdef MAX
#undef MAX
#endif
#ifdef MIN
#undef MIN
#endif
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <vm/vm_param.h>
#include <sys/vmmeter.h>
#include <unistd.h>
#include <kvm.h>
#define GETSYSCTL(name, var) getsysctl(name, &(var), sizeof(var))
static int getsysctl (char *name, void *ptr, size_t len)
{
size_t nlen = len;
if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
return -1;
}
if (nlen != len) {
return -1;
}
return 0;
}
static kvm_t *kd = NULL;
static int swapmode(int *retavail, int *retfree)
{
int n;
int pagesize = getpagesize();
struct kvm_swap swapary[1];
static int kd_init = TRUE;
if(kd_init) {
kd_init = FALSE;
if ((kd = kvm_open("/dev/null", "/dev/null", "/dev/null",
O_RDONLY, "kvm_open")) == NULL) {
g_warning("Cannot read kvm.");
return -1;
}
}
if(kd == NULL) {
return -1;
}
*retavail = 0;
*retfree = 0;
#define CONVERT(v) ((quad_t)(v) * pagesize / 1024)
n = kvm_getswapinfo(kd, swapary, 1, 0);
if (n < 0 || swapary[0].ksw_total == 0)
return(0);
*retavail = CONVERT(swapary[0].ksw_total);
*retfree = CONVERT(swapary[0].ksw_total - swapary[0].ksw_used);
n = (int)((double)swapary[0].ksw_used * 100.0 /
(double)swapary[0].ksw_total);
return(n);
}
gint read_memswap(gulong *mem, gulong *swap, gulong *MT, gulong *MU, gulong *ST, gulong *SU)
{
int total_pages;
int free_pages;
int inactive_pages;
int pagesize = getpagesize();
int swap_avail;
int swap_free;
if(GETSYSCTL("vm.stats.vm.v_page_count", total_pages)) {
g_warning("Cannot read sysctl \"vm.stats.vm.v_page_count\"");
return -1;
}
if(GETSYSCTL("vm.stats.vm.v_free_count", free_pages)) {
g_warning("Cannot read sysctl \"vm.stats.vm.v_free_count\"");
return -1;
}
if(GETSYSCTL("vm.stats.vm.v_inactive_count", inactive_pages)) {
g_warning("Cannot read sysctl \"vm.stats.vm.v_inactive_count\"");
return -1;
}
*MT = CONVERT(total_pages);
*MU = CONVERT(total_pages-free_pages-inactive_pages);
*mem = *MU * 100 / *MT;
if((*swap = swapmode(&swap_avail, &swap_free)) >= 0) {
*ST = swap_avail;
*SU = (swap_avail - swap_free);
}
else {
*swap = 0;
*ST = 0;
*SU = 0;
}
return 0;
}
#elif defined(__NetBSD__)
/*
* NetBSD defines MAX and MIN in sys/param.h, so undef the glib macros first
*/
#ifdef MAX
#undef MAX
#endif
#ifdef MIN
#undef MIN
#endif
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/vmmeter.h>
#include <unistd.h>
/* NetBSD-current post 1.6U uses swapctl */
#if __NetBSD_Version__ > 106210000
#include <sys/swap.h>
#elif __NetBSD_Version__ >= 105010000
/* Everything post 1.5.x uses uvm/uvm_* includes */
#include <uvm/uvm_param.h>
#else
#include <vm/vm_param.h>
#endif
static size_t MTotal = 0;
static size_t MFree = 0;
static size_t MUsed = 0;
static size_t STotal = 0;
static size_t SFree = 0;
static size_t SUsed = 0;
gint read_memswap(gulong *mem, gulong *swap, gulong *MT, gulong *MU, gulong *ST, gulong *SU)
{
int pagesize;
size_t len;
#define ARRLEN(X) (sizeof(X)/sizeof(X[0]))
{
static int mib[] = { CTL_HW, HW_PHYSMEM64 };
int64_t x;
len = sizeof(x);
sysctl(mib, ARRLEN(mib), &x, &len, NULL, 0);
MTotal = x >> 10;
}
{
static int mib[] = {CTL_HW, HW_PAGESIZE};
len = sizeof(pagesize);
sysctl(mib, ARRLEN(mib), &pagesize, &len, NULL, 0);
}
#if __NetBSD_Version__ > 106210000
{
struct swapent* swap;
int nswap, n;
STotal = SUsed = SFree = 0;
if ((nswap = swapctl(SWAP_NSWAP, NULL, 0)) > 0) {
swap = (struct swapent*)malloc(nswap * sizeof(*swap));
if (swapctl(SWAP_STATS, (void*)swap, nswap) == nswap) {
for (n = 0; n < nswap; n++) {
STotal += swap[n].se_nblks;
SUsed += swap[n].se_inuse;
}
STotal = dbtob(STotal >> 10);
SUsed = dbtob(SUsed >> 10);
SFree = STotal - SUsed;
}
free(swap);
}
}
#else
{
struct uvmexp x;
static int mib[] = { CTL_VM, VM_UVMEXP };
len = sizeof(x);
STotal = SUsed = SFree = -1;
pagesize = 1;
if (-1 < sysctl(mib, ARRLEN(mib), &x, &len, NULL, 0)) {
//pagesize = x.pagesize;
STotal = (pagesize*x.swpages) >> 10;
SUsed = (pagesize*x.swpginuse) >> 10;
SFree = STotal - SUsed;
}
}
#endif
{
static int mib[]={ CTL_VM, VM_METER };
struct vmtotal x;
len = sizeof(x);
MFree = MUsed = -1;
if (sysctl(mib, ARRLEN(mib), &x, &len, NULL, 0) > -1) {
MFree = (x.t_free * pagesize) >> 10;
MUsed = (x.t_rm * pagesize) >> 10;
}
}
*mem = MUsed * 100 / MTotal;
if(STotal)
*swap = SUsed * 100 / STotal;
else
*swap = 0;
*MT = MTotal;
*MU = MUsed;
*ST = STotal;
*SU = SUsed;
return 0;
}
#elif defined(__OpenBSD__)
/*
* OpenBSD defines MAX and MIN in sys/param.h, so undef the glib macros first
*/
#ifdef MAX
#undef MAX
#endif
#ifdef MIN
#undef MIN
#endif
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/vmmeter.h>
#include <unistd.h>
#include <uvm/uvm_param.h>
static size_t MTotal = 0;
static size_t MFree = 0;
static size_t MUsed = 0;
static size_t STotal = 0;
static size_t SFree = 0;
static size_t SUsed = 0;
gint read_memswap(gulong *mem, gulong *swap, gulong *MT, gulong *MU, gulong *ST, gulong *SU)
{
long pagesize;
size_t len;
#define ARRLEN(X) (sizeof(X)/sizeof(X[0]))
{
static int mib[] = { CTL_HW, HW_PHYSMEM64 };
int64_t x;
len = sizeof(x);
sysctl(mib, ARRLEN(mib), &x, &len, NULL, 0);
MTotal = x >> 10;
}
{
struct uvmexp x;
static int mib[] = { CTL_VM, VM_UVMEXP };
len = sizeof(x);
STotal = SUsed = SFree = -1;
pagesize = 1;
if (-1 < sysctl(mib, ARRLEN(mib), &x, &len, NULL, 0)) {
pagesize = x.pagesize;
STotal = (pagesize*x.swpages) >> 10;
SUsed = (pagesize*x.swpginuse) >> 10;
SFree = STotal - SUsed;
}
}
{
static int mib[]={ CTL_VM, VM_METER };
struct vmtotal x;
len = sizeof(x);
MFree = MUsed = -1;
if (sysctl(mib, ARRLEN(mib), &x, &len, NULL, 0) > -1) {
MFree = (x.t_free * pagesize) >> 10;
MUsed = (x.t_rm * pagesize) >> 10;
}
}
*mem = MUsed * 100 / MTotal;
if(STotal)
*swap = SUsed * 100 / STotal;
else
*swap = 0;
*MT = MTotal;
*MU = MUsed;
*ST = STotal;
*SU = SUsed;
return 0;
}
#elif defined (__sun__)
#include <sys/stat.h>
#include <sys/swap.h>
#include <kstat.h>
kstat_ctl_t *kc;
static size_t MTotal = 0;
static size_t MFree = 0;
static size_t MUsed = 0;
static size_t STotal = 0;
static size_t SFree = 0;
static size_t SUsed = 0;
void mem_init_stats()
{
kc = kstat_open();
}
gint read_memswap(gulong *mem, gulong *swap, gulong *MT, gulong *MU, gulong *ST, gulong *SU)
{
long pagesize;
struct anoninfo swapinfo;
kstat_t *ksp;
kstat_named_t *knp;
pagesize = (long)(sysconf(_SC_PAGESIZE));
/* FIXME use real numbers, not fake data */
if (!kc)
{
mem_init_stats();
}
if (ksp = kstat_lookup(kc, "unix", 0, "system_pages"))
{
kstat_read(kc, ksp, NULL);
knp = kstat_data_lookup(ksp, "physmem");
MTotal = (pagesize * knp->value.ui64) >> 10;
knp = kstat_data_lookup(ksp, "freemem");
MUsed = MTotal - ((pagesize * knp->value.ui64) >> 10);
}
if (swapctl(SC_AINFO, &swapinfo) == 0) {
STotal = (swapinfo.ani_max * pagesize) >> 10;
SUsed = ((swapinfo.ani_max - swapinfo.ani_free) * pagesize) >> 10;
*swap = SUsed * 100 / STotal;
} else {
STotal = 0;
SUsed = 0;
*swap = 0;
}
*mem = MUsed * 100 / MTotal;
*MT = MTotal;
*MU = MUsed;
*ST = STotal;
*SU = SUsed;
return 0;
}
#else
#error "Your platform is not yet supported"
#endif
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