/*
NAME
       sysconf - Get configuration information at runtime

SYNOPSIS
       #include <unistd.h>

       long sysconf(int name);
 */
#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
    printf ("The pagesize: %ld\n", sysconf(_SC_PAGESIZE));
    printf ("The number of pages: %ld\n", sysconf(_SC_PHYS_PAGES));
    printf ("The number of available pages: %ld\n", sysconf(_SC_AVPHYS_PAGES));
    printf ("The number of processors: %ld\n", sysconf(_SC_NPROCESSORS_CONF));
    printf ("The number of processors online: %ld\n", sysconf(_SC_NPROCESSORS_ONLN));
    printf ("The memory size: %lld MB\n", (long long)sysconf(_SC_PAGESIZE) * (long long)sysconf(_SC_PHYS_PAGES) / (1024*1024) );
    printf ("The number of files max opened:: %ld\n", sysconf(_SC_OPEN_MAX));
    printf("The number of ticks per second: %ld\n", sysconf(_SC_CLK_TCK));
    printf ("The max length of host name: %ld\n", sysconf(_SC_HOST_NAME_MAX));
    printf ("The max length of login name: %ld\n", sysconf(_SC_LOGIN_NAME_MAX));
    return 0;
}
/* man sysconf */