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//
// Copyright (c) 1994, 1995, 2006 by Mike Romberg ( mike.romberg@noaa.gov )
// Copyright (c) 2015 Framestore
//
// This file may be distributed under terms of the GPL
//
#include "memmeter.h"
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define MEMFILENAME "/proc/meminfo"
#define KB(x) ((double)((x) * 1024))
MemMeter::MemMeter( XOSView *parent )
: FieldMeterGraph( parent, 5, "MEM", "USED/BUFF/SLAB/CACHE/FREE" ){
}
void MemMeter::checkResources( void ){
FieldMeterGraph::checkResources();
setfieldcolor( 0, parent_->getResource( "memUsedColor" ) );
setfieldcolor( 1, parent_->getResource( "memBufferColor" ) );
setfieldcolor( 2, parent_->getResource( "memSlabColor" ) );
setfieldcolor( 3, parent_->getResource( "memCacheColor" ) );
setfieldcolor( 4, parent_->getResource( "memFreeColor" ) );
priority_ = atoi (parent_->getResource( "memPriority" ) );
dodecay_ = parent_->isResourceTrue( "memDecay" );
useGraph_ = parent_->isResourceTrue( "memGraph" );
SetUsedFormat (parent_->getResource("memUsedFormat"));
}
void MemMeter::checkevent( void ){
getstats();
drawfields();
}
void MemMeter::getstats() {
FILE *f;
f = fopen(MEMFILENAME, "r");
if (!f) {
perror(MEMFILENAME);
exit(1);
}
/*
* The kernel's "unsigned long" values vary in size on 64-bit and
* 32-bit implementations.
*
* But there's nothing saying userland will match the kernel; we
* must pretty much accomodate anything in ASCII that /proc gives
* us, so 64-bit integers are always used.
*/
unsigned long long mem_total = 0,
mem_free = 0,
buffers = 0,
slab = 0,
cached = 0;
for (;;) {
char line[128];
char *c, *endptr;
unsigned long long kb = 0;
/*
* Parse lines in the format: "FieldName: 12345678 kB"
*
* We prefer to not use scanf because it's harder with variable
* number of fields; the 'kB' is not present if value is 0
*/
if (!fgets(line, sizeof line, f))
break;
c = strchr(line, ':');
if (!c) {
fprintf(stderr, MEMFILENAME ": parse error, ':' expected at '%s'\n", line);
exit(1);
}
*c = '\0';
c++;
kb = strtoull(c, &endptr, 10);
if (kb == ULLONG_MAX) {
fprintf(stderr, MEMFILENAME ": parse error, '%s' is out of range\n", c);
exit(1);
}
if (strcmp(line, "MemTotal") == 0)
mem_total = kb;
else if (strcmp(line, "MemFree") == 0)
mem_free = kb;
else if (strcmp(line, "Buffers") == 0)
buffers = kb;
else if (strcmp(line, "Cached") == 0)
cached = kb;
else if (strcmp(line, "Slab") == 0)
slab = kb;
}
if (fclose(f) != 0)
abort();
/* Don't do arithmetic on the fields_ themselves; these are floating
* point and when memory is large are affected by inaccuracy */
fields_[1] = KB(buffers);
fields_[2] = KB(slab);
fields_[3] = KB(cached);
fields_[4] = KB(mem_free);
fields_[0] = KB(mem_total - mem_free - buffers - cached - slab);
total_ = KB(mem_total);
setUsed(KB(mem_total - mem_free), KB(mem_total));
}
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