How to get the number of CPUs in Linux using C?

Question

Is there an API to get the number of CPUs available in Linux? I mean, without using /proc/cpuinfo or any other sys-node file...

I\'ve found this implementation using

Answer 1

#include 
#include 

int main(int argc, char *argv[])
{
    printf("This system has %d processors configured and "
        "%d processors available.\n",
        get_nprocs_conf(), get_nprocs());
    return 0;
}

https://linux.die.net/man/3/get_nprocs