check_memfree.cpp
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#include "check_memfree.h"
using namespace std;
char *servicename = (char*)"MEMORY";
int getNum(string cmd)
{
char buffer[128];
stringstream sstr;
FILE* pipe = popen(cmd.c_str(), "r");
while (!feof(pipe))
{
if (fgets(buffer, 128, pipe) != NULL)
{
sstr.str(sstr.str()+buffer);
}
}
pclose(pipe);
int num;
sstr >> num;
return num;
}
void printVersion()
{
cout << "check_memfree v" << VERSION << endl << endl;
}
void printHelp(bool longVersion)
{
if(longVersion)
{
printVersion();
cout << "Check free memory space on local machine." << endl << endl;
printHelp(false);
cout << "Options:" << endl;
cout << " -h" << endl;
cout << " Print detailed help screen" << endl;
cout << " -V" << endl;
cout << " Print version information" << endl;
cout << " -w INTEGER" << endl;
cout << " Exit with WARNING status if less than INTEGER bytes of memory space are free" << endl;
cout << " -w PERCENT%" << endl;
cout << " Exit with WARNING status if less than PERCENT of memory space is free" << endl;
cout << " -c INTEGER" << endl;
cout << " Exit with CRITICAL status if less than INTEGER bytes of memory space are free" << endl;
cout << " -c PERCENT%" << endl;
cout << " Exit with CRITCAL status if less than PERCENT of memory space is free" << endl << endl;
return;
}
cout << "Usage: " << endl << "check_memfree [-hV] -w <percent_free>% -c <percent_free>%" << endl << "check_memfree [-hV] -w <bytes_free> -c <bytes_free>" << endl << endl;
}
int main(int argc, char **argv)
{
struct itimerval timer;
timer.it_value.tv_sec = 10;
timer.it_value.tv_usec = 0;
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = 0;
setitimer (ITIMER_VIRTUAL, &timer, 0);
struct sigaction sa;
memset (&sa, 0, sizeof (sa));
sa.sa_handler = &timer_handler;
sigaction (SIGVTALRM, &sa, 0);
char *warningFlag = NULL;
char *criticalFlag = NULL;
int c;
while ((c = getopt (argc, argv, "w:c:Vh")) != -1)
{
switch(c)
{
case 'w':
warningFlag = optarg;
break;
case 'c':
criticalFlag = optarg;
break;
case 'V':
printVersion();
return 0;
case 'h':
printHelp(true);
return 0;
case '?':
printHelp(false);
return 3;
}
}
if(warningFlag == NULL)
{
cout << "Warning limit (-w) wasn't set. Exiting." << endl;
return 3;
}
if(criticalFlag == NULL)
{
cout << "Critical limit (-w) wasn't set. Exiting." << endl;
return 3;
}
double freeMem = 0;
double totalMem = 0;
double pageSize = 0;
totalMem = getNum("sysctl hw.physmem | cut -d' ' -f 2") / 1024;
pageSize = getNum("sysctl hw.pagesize | cut -d' ' -f 2");
freeMem += getNum("sysctl vm.stats.vm.v_inactive_count | cut -d' ' -f 2") * pageSize;
freeMem += getNum("sysctl vm.stats.vm.v_cache_count | cut -d' ' -f 2") * pageSize;
freeMem += getNum("sysctl vm.stats.vm.v_free_count | cut -d' ' -f 2") * pageSize;
freeMem /= 1024;
int freeMemMB = freeMem / 1024;
int totalMemMB = totalMem / 1024;
int percFree = ((double)freeMemMB/(double)totalMemMB)*100;
range warningLimit, criticalLimit;
try
{
warningLimit = parseRange(warningFlag,totalMemMB);
criticalLimit = parseRange(criticalFlag,totalMemMB);
}
catch(rangeException e)
{
cout << e.what() << endl;
exit(3);
}
int returnCode;
cout << servicename;
if((freeMemMB > criticalLimit.min) && (freeMemMB < criticalLimit.max))
{
cout << " CRITICAL";
returnCode = 2;
}
else if((freeMemMB > warningLimit.min) && (freeMemMB < warningLimit.max))
{
cout << " WARNING";
returnCode = 1;
}
else
{
cout << " OK";
returnCode = 0;
}
cout << " - " << percFree << "% free (" << freeMemMB << " MB out of " << totalMemMB << " MB) |memory=" << freeMemMB << "MB;" << warningLimit.max << ";" << criticalLimit.max << ";" << "0;" << totalMemMB << endl;
return returnCode;
}